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CN-224228739-U - Engine braking device

CN224228739UCN 224228739 UCN224228739 UCN 224228739UCN-224228739-U

Abstract

The utility model relates to the technical field of internal combustion engines, and particularly discloses an engine braking device which comprises a braking mechanism and a rocker arm, wherein the braking mechanism is arranged on the rocker arm, and a pressure release piece is arranged in the braking mechanism in a matched manner; the pressure relief piece is arranged on the pushing block, the pressure relief piece comprises a moving block, the bottom surface of the pushing block is provided with the moving block, the end surface of the moving block is provided with a connecting cylinder, the connecting cylinder is communicated with the upper part of the pushing block and the inside of the moving block, and pressure relief grooves are symmetrically formed below the side wall of an inner cavity of the moving block.

Inventors

  • ZHUANG HUI

Assignees

  • 上海广土科技有限公司

Dates

Publication Date
20260512
Application Date
20250716

Claims (6)

  1. 1. An engine braking device comprises a braking mechanism (1) and a rocker arm (2), and is characterized in that the braking mechanism (1) is installed on the rocker arm (2), and a pressure release piece (3) is installed in the braking mechanism (1) in a matched mode; The braking mechanism (1) comprises a shell (103), a fixed plate (114) is arranged on the bottom surface of the shell (103), a spring III (112) is arranged on the end surface of the fixed plate (114), and a pushing block (111) is arranged on the end surface of the spring III (112); The pressure relief piece (3) is arranged on the pushing block (111), the pressure relief piece (3) comprises a moving block (305), the moving block (305) is arranged on the bottom surface of the pushing block (111), a connecting cylinder (301) is arranged on the end surface of the moving block (305), the connecting cylinder (301) is communicated with the upper part of the pushing block (111) and the inside of the moving block (305), and pressure relief grooves (306) are symmetrically formed below the side wall of an inner cavity of the moving block (305); A fourth spring (304) is arranged on the bottom surface of the inner cavity of the moving block (305), and a second sealing bead (303) is arranged on the top surface of the fourth spring (304).
  2. 2. An engine brake device according to claim 1, wherein the second closing bead (303) is in contact with the bottom surface of the connecting cylinder (301), and the moving block (305) and the fixed plate (114) slide against each other.
  3. 3. The engine brake device according to claim 1, wherein a first spring seat (102) is installed above the inner cavity of the housing (103), a first spring (105) is installed on the bottom surface of the first spring seat (102), and a valve rod (104) is installed at the bottom end of the first spring (105).
  4. 4. The engine braking device according to claim 3, wherein the mounting frame (109) is mounted in the middle of the inner cavity of the housing (103), the second spring seat (110) is mounted on the bottom surface of the mounting frame (109), the second spring seat (113) is mounted on the end surface of the second spring seat (110), the first sealing bead (107) is mounted on the end surface of the second spring seat (113), the first communicating groove (108) is formed in the end surface of the mounting frame (109), and the first communicating groove (108) is communicated with the upper side and the lower side of the housing (103).
  5. 5. The engine brake device according to claim 4, wherein the second spring seat (110) is symmetrically provided with connecting holes (115), and the connecting holes (115) are communicated with the upper side and the lower side of the housing (103).
  6. 6. The engine brake device according to claim 1, wherein an oil inlet (106) is formed in the side wall of the housing (103), an oil ring groove (4) and an oil hole (5) are formed in the rocker arm (2), the oil ring groove (4) is communicated with the oil hole (5), and the oil ring groove (4) is communicated with the oil inlet (106).

Description

Engine braking device Technical Field The utility model belongs to the technical field of internal combustion engines, and particularly relates to an engine braking device. Background The engine braking device is capable of providing one or more auxiliary valve lifts for implementing an engine braking function. There are several patents related to the application of this technology, mainly including one or several additional auxiliary lifts outside the main lift of the cam, and also adding a cam specially used for braking, the engine braking device can make the auxiliary lift active (implement engine braking function) or make it inactive according to the requirement of engine operation. In CN214499193U, under the driving of the auxiliary cam, near the top dead center of the compression stroke of the engine, the brake plunger collides with the sliding pin, and the brake plunger and the sliding pin are mutually subjected to a reaction force, at this time, high-pressure oil is formed in the second mounting groove and the third mounting groove, and the ball body is pushed to seal the oil through hole under the action of the high-pressure oil, so that the engine oil cannot flow out to form a closed oil path, the brake plunger cannot move upwards, and therefore the sliding pin can be pressed down, and the exhaust valve is opened, thereby realizing engine braking; In CN103758606B, when the cam rotates to the exhaust protrusion to contact with the roller, the valve lift is larger at this time, and after the reserved valve gap is complemented, there is enough valve lift to make the exhaust valve act, so that the exhaust valve is opened to realize normal exhaust action; when the exhaust cam rotates until the brake bulge contacts with the roller, the lift generated by the brake bulge can act on the brake piston and the socket of the brake piston assembly in the same proportion because the brake mechanism and the rocker arm are rigidly connected, and the exhaust valve bridge is triggered to open the exhaust valve in advance so as to realize braking work. The function of the braking device is realized, hydraulic rigid connection is formed through high-pressure fluid, the pressure in the high-pressure fluid cavity is high, and high requirements are required on the structure of the high-pressure fluid cavity; accordingly, an engine braking device is proposed in the present solution to overcome the above-mentioned problems. Disclosure of utility model The utility model aims to provide an engine braking device, which solves the problems that the excessive pressure in an air cylinder easily causes the excessive pressure of high-pressure fluid in the prior art, the structural strength of a high-pressure fluid cavity cannot resist the internal pressure of the high-pressure fluid cavity, and the structure is possibly damaged. In order to achieve the aim, the utility model provides the technical scheme that the engine braking device comprises a braking mechanism and a rocker arm, wherein the braking mechanism is arranged on the rocker arm, and a pressure release piece is arranged in the braking mechanism in a matched manner; The braking mechanism comprises a shell, a fixed plate is arranged on the bottom surface of the shell, a spring III is arranged on the end surface of the fixed plate, and a pushing block is arranged on the end surface of the spring III; The pressure relief piece is arranged on the pushing block and comprises a moving block, the bottom surface of the pushing block is provided with the moving block, the end surface of the moving block is provided with a connecting cylinder, the connecting cylinder is communicated with the upper part of the pushing block and the inside of the moving block, and pressure relief grooves are symmetrically formed below the side wall of the inner cavity of the moving block; The bottom surface of the inner cavity of the moving block is provided with a spring IV, and the top surface of the spring IV is provided with a sealing bead II. Preferably, the second sealing bead contacts with the bottom surface of the connecting cylinder, and the moving block and the fixed plate slide mutually. Preferably, a first spring seat is arranged above the inner cavity of the shell, a first spring is arranged on the bottom surface of the first spring seat, and a valve rod is arranged at the bottom end of the first spring. Preferably, a mounting frame is arranged in the middle of an inner cavity of the shell, a second spring seat is arranged on the bottom surface of the mounting frame, a second spring is arranged on the end surface of the second spring seat, a first sealing bead is arranged on the end surface of the second spring, a first communicating groove is formed in the end surface of the mounting frame, and the communicating groove is communicated with the upper side and the lower side of the shell. Preferably, the second spring seat is symmetrically provided with connecting holes, and the connect