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DE-112019006270-B4 - Throttle device and method for manufacturing a throttle device

DE112019006270B4DE 112019006270 B4DE112019006270 B4DE 112019006270B4DE-112019006270-B4

Abstract

Including a throttle device: a body (10) on which an inlet opening (11) is formed; a throttle valve (31) which is provided in the inlet passage and whose degree of opening is adapted; a shaft (32) which is rotatably carried through the body and to which the throttle valve is attached; an actuator (80) configured to output a drive torque; a valve train (40) comprising a gear section (41) configured to rotate by the drive torque transmitted by the actuator, a hub section (42) provided on the gear section having a cylindrical outer wall (425), and one or more extension sections (45) extending in an axial direction from the gear section on a radially outer side of the hub section to form the gear section, hub section, and extension section integrally; a spiral spring (50) comprising a first hook (51) extrapolated to the outer wall of the hub section of the valve train and provided at an end section on one side of the gear section, and a second hook (52) provided at an end section on the opposite side to the gear section, such that the first hook and the second hook each engage on opposite sides to each other in a circumferential direction of the extension section, and a guide (601-604) with a cylindrical guide main body (65) provided between the outer wall of the hub section and an inner circumference of the spring, and configured to act as a buffer to prevent sliding of the hub section and the spring as a result of rotation of the gear section on at least the side of the gear section in the axial direction, wherein the guide is a component of a valve train subassembly, wherein the valve train sub-assembly (701-704), which is formed by mounting the valve train, the spring and the guide, is received in a valve train receiving chamber (13) of the body, wherein the second hook of the spring engages with the body, and the shaft is attached to the hub section of the valve train.

Inventors

  • Akira Higuchi
  • Kenichi Ishihara

Assignees

  • DENSO CORPORATION

Dates

Publication Date
20260513
Application Date
20191213
Priority Date
20181218

Claims (7)

  1. A throttle device comprising: a body (10) in which an inlet passage (11) is formed; a throttle valve (31) provided in the inlet passage, the degree of opening of which is adjusted; a shaft (32) rotatably supported by the body, to which the throttle valve is attached; an actuator (80) configured to output a drive torque; a valve train (40) comprising a gear section (41) configured to rotate by the drive torque transmitted by the actuator, a hub section (42) provided on the gear section and having a cylindrical outer wall (425), and one or more extension sections (45) extending axially from the gear section to a radially outer side of the hub section to form the gear section, hub section, and extension section integrally; a coil spring (50) comprising a first hook (51) extrapolated to the outer wall of the hub section of the valve train and provided at an end section on one side of the gear section, and a second hook (52) provided at an end section on the opposite side to the gear section, such that the first hook and the second hook each engage on opposite sides to each other in a circumferential direction of the extension section, and a guide (601-604) with a cylindrical guide main body (65) provided between the outer wall of the hub section and an inner circumference of the spring, configured to act as a buffer to prevent sliding of the hub section and the spring as a result of rotation of the gear section on at least the side of the gear section in the axial direction, the guide being an integral part of a valve train subassembly, the valve train subassembly (701-704) being formed by assembling the valve train, the spring, and the guide, is received in a valve train receiving chamber (13) of the body, wherein the second hook of the spring engages with the body, and the shaft is attached to the hub section of the valve train.
  2. Throttle device according to Claim 1 , wherein the guide is divided into two parts in the axial direction.
  3. Throttle device according to Claim 1 or 2 , wherein the at least one guide (601-603) has an edge section (66) that projects in a radial direction from an axial end section of the guide main body.
  4. Throttle device according to Claim 3 , wherein the at least one guide (602, 603) has a side wall section (67) which extends from a peripheral edge of the edge section towards a central position in the axial direction and guides the spring at least at the axial end section on an outside.
  5. Throttle device according to one of the Claims 1 until 4 , wherein the at least one guide (603) has a cover section (68) that covers the first hook and the second hook of the spring and projects outwards in a part in the circumferential direction from an axial end section of the guide main body.
  6. Throttle device according to one of the Claims 1 until 5 , wherein the body is formed with a projecting cylindrical section (14) which projects from a lower section of the valve train receiving chamber, the valve train sub-assembly has a mounting space (54) inside the spring in which the projecting cylindrical section is mounted when the valve train sub-assembly is received in the valve train receiving chamber, and a bearing (34) is held inside the projecting cylindrical section in a position which overlaps the spring in the axial direction with an outer circumference of the shaft.
  7. A method for manufacturing a throttle device comprising: a body (10) in which an inlet passage (11) is formed; a throttle valve (31) provided on the inlet passage, the degree of opening of which is adapted; a shaft (32) rotatably supported by the body, to which the throttle valve is attached; an actuator (80) configured to output a drive torque; a valve train (40) comprising a gear section (41) configured to rotate by the drive torque transmitted by the actuator, a hub section (42) provided on the gear section and having a cylindrical outer wall (425), and one or more extension sections (45) extending axially from the gear section to a radially outer side of the hub section to integrally form the gear section, the hub section, and the extension section; a coil spring (50) comprising a first hook (51) extrapolated to the outer wall of the hub section of the valve train and provided at an end section on one side of the gear section, and a second hook (52) provided at an end section on the opposite side of the gear section, such that the first hook and the second hook engage on opposite sides of each other in a circumferential direction of the extension section; and a guide (601-604) with a cylindrical guide main body (65) provided between the outer wall of the hub section and an inner circumference of the spring, configured to act as a buffer to prevent sliding of the hub section and the spring as a result of rotation of the gear section on at least the side of the gear section in the axial direction, the guide being part of a valve train subassembly, comprising: a valve assembly step (S1) in which the throttle valve and the shaft are mounted to the body; a sub-assembly step (S2) in which the valve train, spring, and guide are assembled to form a valve train sub-assembly (701-704); a receiving step (S3) following the valve assembly step and the sub-assembly step in which the valve train sub-assembly is received into a valve train receiving chamber (13) of the body, with the second hook of the spring engaging on the body; and a shaft fixing step (S4) following the receiving step in which the shaft is fixed to the hub section of the valve train in a state in which the rotational position of the throttle valve is adjusted.

Description

Cross-reference to related registration This registration is based on the Japanese patent application No. 2018-236469 , JP 2020 - 97 908 A , submitted on December 18, 2018. Technical field The present disclosure relates to a throttle device and a method for manufacturing the throttle device. background In a conventional throttle device configured to adjust the opening degree of a throttle valve located in an intake manifold, an extrapolated helical spring generates a compressive force on a valve train, to which a drive torque is transmitted by an actuator, in order to maintain the throttle valve opening at a predetermined degree. During the assembly process of the throttle device, when the valve train and spring are individually housed in a body, one of the two hooks formed at either end of the spring engages with the valve train, while the other engages with the body. After housing the valve train and spring in the body, it is then necessary to temporarily mount them to a shaft while their rotational positions are adjusted. Furthermore, the throttle device, which is in JP 2003 - 120 335 A As disclosed, a valve train (a throttle gear 107), a spring (a twisted coil spring 113), a guide (a cover 115, 117), and a shaft (a throttle shaft 103) are mounted on a projecting cylinder section (a bearing hub 105) of a body (a throttle body 101). Since the hooks (functional ends 113a and 113b) at both ends of the spring are received in the projecting section of the guide, contact pressure is relieved between the hook and the body closure (a standard hub 119). The descriptions in brackets are part designations and corresponding numbers, which are specified in JP 2003 - 120 335 A are described. US 8 746 210 B2 This describes a helical torsional return spring and a throttle assembly for forcing a throttle valve of a throttle assembly into a standard position when a throttle motor of the throttle assembly is deactivated. The return spring consists of a center section, a first end section, a second end section, a first spring leg, and a second spring leg. The throttle assembly comprises a throttle shaft, a first bushing, a second bushing, and the spring described above. A first center axis of the end section, defined by the first end section, and a second center axis of the end section, defined by the second end section, are offset from a center axis of the center section, defined by the center section. DE 11 2018 003 440 T5 The following is described: When a rotating body is in a default position due to the absence of a driving force, a first hook section and a second hook section engage with a fixed engagement section and/or a movable engagement section. When the rotating body is turned from the default position by the driving force, the first hook section engages with one section from the fixed engagement section and the movable engagement section, and the second hook section engages with the other section from the fixed engagement section and the movable engagement section. A throttle valve device includes a press section that presses on the first hook section and/or the second hook section to apply a press force in a spiral axial direction toward the center of a spiral section. DE 10 2015 105 642 A1 This describes an actuator and its assembly method. In an electric actuator, an end section of a return spring is hooked onto a first slot formed in a radially outer guide of a delivery gear, causing the return spring to be rotated by a predetermined angle (α) that is slightly smaller than an initial set angle. An inclined slot section is formed at an opening of a second slot, which is formed on a covering wall of a spring installation part, to rotate the return spring to a predetermined initial set angle. This rotates the return spring by the initial set angle simultaneously with the assembly of a valve shaft with the delivery gear. This simplifies the assembly process of the electric actuator. Literature on the state of the art Patent literature JP 2003 - 120 335 AUS 8 746 210 B2DE 11 2018 003 440 T5DE 10 2015 105 642 A1 Summary In the configuration described in patent document 1, it is necessary to mount the guide and the spring after the valve train and shaft have been integrated. Therefore, the shaft must be aligned in a specific direction of rotation so that the valve can be mounted, and the valve train must also be aligned in the direction of rotation with the body closure in a specific position. Furthermore, the guide (cover 115) on the side of the valve train and the hook (functional end 113a) of the spring must be rotated and mounted in a position where they engage with the valve train, thus positioning the spring at a predetermined position in the direction of rotation. Therefore, the assembly process is complex. One object of the present disclosure is to provide a throttle device and a method for manufacturing the throttle device which improve the mounting characteristics of a valve train and a spring on a body.