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CN-117418914-B - Device capable of adjusting valve spring force and internal combustion engine with same

CN117418914BCN 117418914 BCN117418914 BCN 117418914BCN-117418914-B

Abstract

The invention discloses a device capable of adjusting valve spring force and an internal combustion engine with the same. The valve adjusting assembly comprises a driving mechanism and a transmission mechanism, wherein the driving mechanism is in transmission connection with the transmission mechanism, and the transmission mechanism is in transmission connection with one end of the adjusting base close to the driving assembly, wherein the driving mechanism drives the transmission mechanism to rotate in a first direction or a second direction opposite to the first direction so as to drive the adjusting base to move along the axial direction of a valve rod of the valve, and the position of the adjusting base in the axial direction of the valve rod is unchanged when the transmission mechanism does not rotate. The driving mechanism can drive the transmission mechanism to rotate, so that the height of the adjusting base is adjusted, the elasticity of the valve spring is matched with the working condition of the internal combustion engine, and the friction power consumption caused by larger valve spring force is reduced.

Inventors

  • WANG JINGTANG
  • FAN BENZHENG

Assignees

  • 上海汽车集团股份有限公司

Dates

Publication Date
20260512
Application Date
20220711

Claims (13)

  1. 1. An adjustable valve spring force device is characterized in that the valve device comprises a valve assembly, a driving assembly for driving the valve assembly and a valve adjusting assembly, wherein The valve assembly at least comprises a valve, a valve spring and an adjusting base, wherein the valve spring is sleeved on the valve rod along the axial direction of the valve rod of the valve, one end of the valve spring is fixedly connected with one end of the valve, which is close to the driving assembly, the other end of the valve spring is sleeved in the adjusting base, the valve can penetrate through the adjusting base in a displacement manner along the axial direction of the valve rod, and The valve adjusting assembly comprises a driving mechanism and a transmission mechanism, wherein the driving mechanism is in transmission connection with the transmission mechanism, the transmission mechanism is in transmission connection with one end, close to the driving assembly, of the adjusting base, the transmission mechanism is driven by the driving mechanism to rotate in a first direction or a second direction opposite to the first direction, so that the adjusting base is driven to move along the axial direction of a valve rod of the valve, the elastic force of the valve spring is adjusted, and the position, in the axial direction of the valve rod, of the adjusting base is unchanged when the transmission mechanism does not rotate.
  2. 2. The device for adjusting valve spring force according to claim 1, wherein the transmission mechanism is provided as a cam shaft, the driving mechanism drives the cam shaft to rotate around a direction perpendicular to a valve shaft axis direction of the valve, and one end of the adjustment base near the driving assembly is provided with a through hole allowing the cam shaft to pass through, and a cam outer peripheral surface of the cam shaft abuts against an inner peripheral surface of the through hole.
  3. 3. The valve spring force adjustable device according to claim 2, wherein an end of the adjustment base near the drive assembly has an extension portion projecting toward the cam shaft, the through hole is formed through the extension portion, and inner peripheral surfaces of the through holes at both ends of the extension portion are respectively abutted against corresponding cam outer peripheral surfaces in an extending direction of the cam shaft.
  4. 4. The device of claim 3, wherein the extension portion is a lug unit fixedly disposed at the one end of the adjustment base, the lug unit includes two lugs symmetrically disposed along an axial direction of the adjustment base, each of the lugs is hung on a corresponding cam, a spring support surface is disposed at an end of the adjustment base away from the lug unit, and an end portion of the valve spring is abutted against the spring support surface, wherein When the cam shaft rotates along the first direction, the cam drives the adjusting base to move towards the cam shaft along the axial direction of the valve shaft until the adjusting base reaches the nearest position closest to the cam shaft; When the cam shaft rotates along the second direction, the cam drives the adjusting base to move away from the cam shaft along the axial direction of the valve shaft until the adjusting base reaches the farthest position away from the cam shaft.
  5. 5. The device for adjusting valve spring force according to claim 1, wherein the transmission mechanism is a cam shaft, the driving mechanism drives the cam shaft to rotate around a direction perpendicular to a valve shaft axis direction of the valve, an end face of the adjusting base near one end of the driving assembly is movably connected to a cam outer peripheral surface of the cam shaft, and the end face can move up and down in a direction perpendicular to the axis of the cam shaft when the cam shaft rotates, wherein the adjusting base is provided with a plurality of guide grooves, wherein the guide grooves are formed in the guide grooves, and the guide grooves are formed in the guide grooves When the cam shaft rotates in the first direction, the cam drives the adjusting base to move away from the cam shaft along the axial direction of the valve shaft until the adjusting base reaches the farthest position away from the cam shaft; when the camshaft rotates in the second direction, the cam pushes the adjusting base to move towards the camshaft along the axial direction of the valve rod until the adjusting base reaches the nearest position closest to the camshaft.
  6. 6. The device for adjusting valve spring force according to claim 1, wherein the transmission mechanism is an eccentric shaft, the driving mechanism drives the eccentric shaft to rotate around a direction perpendicular to the axial direction of the valve shaft of the valve, and the end face of the adjusting base, which is close to one end of the driving assembly, is movably connected to the outer circumferential surface of the eccentric shaft diameter of the eccentric shaft; wherein the method comprises the steps of When the eccentric shaft rotates along the first direction, the eccentric shaft diameter drives the adjusting base to move towards the eccentric shaft along the axial direction of the valve shaft until the adjusting base reaches the nearest position closest to the eccentric shaft; when the eccentric shaft rotates in the second direction, the eccentric shaft diameter pushes the adjusting base to move away from the eccentric shaft along the axial direction of the valve shaft until the adjusting base reaches the farthest position away from the eccentric shaft.
  7. 7. A device for adjusting valve spring force as defined in any one of claims 1-6, wherein the drive assembly includes a valve camshaft and rocker arm assembly, wherein The valve cam shaft is arranged on one side of the rocker arm assembly, the rocker arm assembly is in transmission connection with the valve cam shaft, one end of the rocker arm assembly extends to the lower part of the transmission mechanism and is in butt joint with the top end of a valve rod of the valve, and the valve cam shaft can drive the rocker arm assembly to swing and drive the valve assembly to reciprocate along the axial direction of the valve rod of the valve, so that a valve cover of the valve is driven to switch between a closed state and an open state; when the valve cover of the valve is in the closed state, the valve spring is in a pre-tightening state, and the combustion chamber and the air passage of the internal combustion engine are closed; When the valve cover is in the open state, the valve spring is in a compressed state, and a combustion chamber of the internal combustion engine and the air passage are opened.
  8. 8. The device for adjusting valve spring force according to claim 7, wherein the driving mechanism comprises a driver, a transmission shaft and a transmission wheel, the transmission shaft is connected to an output end of the driver, the driver can drive the transmission shaft to rotate, and The transmission shaft is arranged as a worm shaft, worm teeth are arranged on the outer wall surface of the worm shaft along the length direction, the transmission wheel is a worm wheel matched with the worm teeth, and when the driver drives the worm shaft to rotate, the worm shaft drives the worm wheel to rotate.
  9. 9. The valve spring force adjustable device according to claim 8, wherein a connecting hole structure is arranged at the center of the worm wheel, the connecting hole structure comprises any one of a square hole, a spline hole or a semicircular hole, and a shaft diameter structure matched with the connecting hole is arranged at one end, close to the worm wheel, of the transmission mechanism, and comprises any one of a square shaft, a spline shaft or a semicircular shaft.
  10. 10. The device for adjusting valve spring force according to claim 9, wherein the valve adjustment assembly further comprises a torsion spring disposed at an end of the transmission mechanism remote from the worm gear, and The transmission mechanism is far away from one end of the worm wheel is provided with a clamping groove, one end of the torsion spring is clamped in the clamping groove, and the other end of the torsion spring is clamped on the cylinder cover.
  11. 11. The device for adjusting valve spring force according to claim 10, wherein the outer wall surface of the adjusting base is provided with a sliding groove, the cylinder head of the internal combustion engine is provided with a sliding block matched with the sliding groove, the sliding block is in sliding connection with the sliding groove, the sliding groove and the sliding block are used for limiting the adjusting base and the transmission mechanism to rotate, when the adjusting base moves along the axial direction of a valve stem of the valve, the adjusting base can slide along the sliding groove, and And a plurality of oil drain holes are further formed in one end, close to the spring supporting surface, of the outer wall surface of the adjusting base.
  12. 12. The valve spring force adjustable device according to claim 11, wherein an axial direction of the transmission mechanism is disposed in parallel with an axial direction of the valve cam shaft, and wherein the axial direction of the transmission mechanism is disposed perpendicularly to the axial direction of the transmission shaft.
  13. 13. An internal combustion engine comprising a cylinder head, further comprising a valve spring force adjustable device according to any one of claims 1-12.

Description

Device capable of adjusting valve spring force and internal combustion engine with same Technical Field The invention relates to the technical field of intake valves of internal combustion engines, in particular to a device capable of adjusting valve spring force and an internal combustion engine with the device. Background The valve mechanism of the internal combustion engine has the functions of opening and closing the inlet valve and the exhaust valve at regular time according to the working sequence and the working process of the engine, and the valve of the internal combustion engine is driven by a cam to overcome the valve spring force to finish opening and closing. The magnitude of the valve spring force is set to be relatively large based on the rated operating condition and the maximum rotational speed of the internal combustion engine, and the internal combustion engine does not need the maximum spring force when operating under other operating conditions, for example, when the rotational speed of the internal combustion engine is relatively low or the load is relatively low, the valve spring is required to provide the spring force smaller than the valve spring force under the rated operating condition. Therefore, the best condition is that the elasticity of the valve spring is matched with the working condition according to the working condition of the internal combustion engine so as to reduce the friction power consumption caused by larger valve spring force. This requires changing the valve spring force according to the operating conditions of the internal combustion engine. However, the spring force of the valve spring in the prior art is determined, and the spring force of the valve spring cannot be changed according to the working condition of the internal combustion engine. Disclosure of Invention The invention aims to solve the problem that the spring force of the valve spring in the prior art is definite and can not be changed according to the working condition of an internal combustion engine. In order to solve the technical problems, an embodiment of the invention discloses an adjustable valve spring force device, which comprises a valve assembly, a driving assembly for driving the valve assembly and a valve adjusting assembly. The valve assembly at least comprises a valve, a valve spring and an adjusting base, wherein the valve spring is sleeved on the valve rod along the axial direction of the valve rod of the valve, one end of the valve spring is fixedly connected with one end of the valve, which is close to the driving assembly, and the other end of the valve spring is sleeved in the adjusting base, the valve rod of the valve penetrates through the adjusting base along the axial displacement, the valve adjusting assembly comprises a driving mechanism and a transmission mechanism, the driving mechanism is in transmission connection with the transmission mechanism, and the transmission mechanism is in transmission connection with one end, which is close to the driving assembly, of the adjusting base, wherein the driving mechanism drives the transmission mechanism to rotate in a first direction or a second direction opposite to the first direction, so as to drive the adjusting base to move along the axial direction of the valve rod of the valve, adjust the elasticity of the valve spring, and the position of the adjusting base in the axial direction of the valve rod is unchanged when the transmission mechanism does not rotate. By adopting the technical scheme, through setting up the valve adjusting part, can adjust the height of adjusting the base among the valve assembly, and then adjust the spring force of valve spring. Specifically, an automobile Electronic Control Unit (ECU) can control a driving mechanism to act according to the working condition of an internal combustion engine, and the driving mechanism drives a transmission mechanism to rotate so as to adjust the height of a base, so that the elasticity of a valve spring is adjusted, the valve spring force is matched with the working condition of the internal combustion engine, and the friction power consumption caused by the larger valve spring force is reduced. More specifically, the transmission mechanism can drive the adjusting base to move along the valve stem axis direction of the valve, namely, the transmission mechanism can drive the adjusting base to ascend or descend along the valve stem axis direction of the valve, and when the adjusting base ascends along the valve stem axis direction of the valve, the spring force of the valve spring to be overcome by the driving assembly is increased. When the adjustment base is lowered in the direction of the valve stem axis of the valve, the spring force of the valve spring to be overcome by the drive assembly is reduced. And after the transmission mechanism controls the adjusting base to finish position adjustment, the transmission mechanism does not rotate any more, and the po