Engine braking device

Abstract

The utility model relates to the technical field of internal combustion engines, in particular to an engine braking device which comprises a braking mechanism and a rocker arm, the braking mechanism is installed on the rocker arm, and a pressure relief piece is installed in the braking mechanism in a matched mode. The braking mechanism comprises a shell, a fixing plate is installed on the bottom face of the shell, a third spring is installed on the end face of the fixing plate, and a pushing block is installed on the end face of the third spring. The pressure relief piece is installed on the pushing block, the pressure relief piece comprises a moving block, the moving block is installed on the bottom face of the pushing block, a connecting cylinder is installed on the end face of the moving block, the connecting cylinder communicates with the upper portion of the pushing block and the interior of the moving block, and pressure relief grooves are symmetrically formed in the lower portion of the side wall of an inner cavity of the moving block; through mutual cooperation of the structures, the effect that when the internal pressure intensity of the braking mechanism is too high, pressure in the device can be relieved in time is achieved, and the problem that the device is damaged due to the fact that the internal pressure intensity of the device is too high is solved.

Description

Technical Field

[0001] This utility model belongs to the field of internal combustion engine technology, and specifically relates to an engine braking device. Background Technology

[0002] Engine braking systems can provide one or more auxiliary valve lifts to achieve engine braking. Several patented inventions involve this technology, primarily involving adding one or more auxiliary lifts in addition to the main cam lift. A dedicated braking cam can also be added. Depending on the engine's operating needs, the engine braking system activates the auxiliary lifts (to achieve engine braking) or deactivates them.

[0003] In CN214499193U, driven by the auxiliary cam, near the top dead center of the engine compression stroke, the brake plunger and the sliding pin abut against each other. The brake plunger and the sliding pin are subjected to a reaction force. At this time, high-pressure oil is formed in the second and third mounting grooves. Under the action of the high-pressure oil, the ball is pushed to seal the oil passage, so the oil cannot flow out, forming a closed oil passage. The brake plunger will not move upward, so the sliding pin will be pressed down, thereby opening the exhaust valve and realizing engine braking.

[0004] In CN103758606B, when the cam rotates to the point where the exhaust cam contacts the roller, the valve lift is relatively large. After making up for the reserved valve clearance, there is still enough valve lift to make the exhaust valve actuate, thereby opening the exhaust valve to achieve normal exhaust action. At this time, a hydraulic rigid connection is formed in the upper part of the stepped through hole where the one-way valve is located, the oil passage, and the brake oil chamber. When the exhaust cam rotates to the point where the brake cam contacts the roller, since the brake mechanism and the rocker arm have formed a rigid connection, the lift generated by the brake cam can act proportionally on the brake piston and the seat of the brake piston assembly, and trigger the exhaust valve bridge to open the exhaust valve in advance to achieve braking work.

[0005] The aforementioned braking device achieves its function by forming a hydraulic rigid connection through high-pressure fluid. The pressure inside the high-pressure fluid chamber is relatively high, which places high demands on the structure of the high-pressure fluid chamber. If the pressure inside the cylinder is too high, it can easily lead to excessive pressure of the high-pressure fluid, and the structural strength of the high-pressure fluid chamber may not be able to withstand the internal pressure, which may result in structural damage.

[0006] Therefore, this solution proposes an engine braking device to overcome the above problems. Utility Model Content

[0007] The purpose of this invention is to provide an engine braking device to solve the problem in the prior art where excessive pressure inside the cylinder can easily lead to excessive pressure of the high-pressure fluid, and the structural strength of the high-pressure fluid cavity cannot withstand the internal pressure, which may cause structural damage.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an engine braking device, comprising a braking mechanism and a rocker arm, wherein the braking mechanism is mounted on the rocker arm, and a pressure relief component is installed in the braking mechanism;

[0009] The braking mechanism includes a housing, a fixing plate is mounted on the bottom surface of the housing, a spring three is mounted on the end face of the fixing plate, and a push block is mounted on the end face of the spring three.

[0010] The pressure relief component is installed on the push block. The pressure relief component includes a movable block. The movable block is installed on the bottom surface of the push block. A connecting cylinder is installed on the end face of the movable block. The connecting cylinder connects the top of the push block and the interior of the movable block. Pressure relief grooves are symmetrically opened on the lower side wall of the inner cavity of the movable block.

[0011] A spring four is installed on the bottom surface of the inner cavity of the movable block, and a sealing bead two is installed on the top surface of the spring four.

[0012] Preferably, the second closed bead is in contact with the bottom surface of the connecting cylinder, and the moving block slides against the fixed plate.

[0013] Preferably, a spring seat is installed above the inner cavity of the outer shell, a spring is installed on the bottom surface of the spring seat, and a valve stem is installed at the bottom end of the spring.

[0014] Preferably, a mounting bracket is installed in the middle of the inner cavity of the outer shell, a second spring seat is installed on the bottom surface of the mounting bracket, a second spring is installed on the end face of the second spring seat, a first sealing bead is installed on the end face of the second spring, and a first connecting groove is opened on the end face of the mounting bracket, the first connecting groove connecting the upper and lower sides of the outer shell.

[0015] Preferably, the second spring seat has symmetrical connecting holes on its upper surface, and the connecting holes connect the upper and lower sides of the outer shell.

[0016] Preferably, the side wall of the outer casing is provided with an oil inlet, and the upper part of the rocker arm is provided with an oil groove and an oil hole, the oil groove and the oil hole are interconnected, and the oil groove and the oil inlet are interconnected.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention incorporates a pressure relief component in an engine braking device. During operation, the interplay of these components enables timely pressure relief when the internal pressure of the braking mechanism becomes excessive, thus preventing damage to the device due to excessive internal pressure. Attached Figure Description

[0019] Figure 1This is a cross-sectional view of the present invention;

[0020] Figure 2 This is a schematic diagram of the rocker arm structure in this utility model;

[0021] Figure 3 This is a cross-sectional view of the rocker arm in this utility model;

[0022] Figure 4 This is a cross-sectional view of the braking structure in this utility model;

[0023] Figure 5 This is a schematic diagram of the connecting hole structure in this utility model.

[0024] In the diagram: 1. Braking mechanism; 101. Fixed seat; 102. Spring seat one; 103. Housing; 104. Valve stem; 105. Spring one; 106. Oil inlet; 107. Sealing bead one; 108. Connecting groove one; 109. Mounting bracket; 110. Spring seat two; 111. Push block; 112. Spring three; 113. Spring two; 114. Fixed plate; 115. Connecting hole; 2. Rocker arm; 3. Pressure relief component; 301. Connecting cylinder; 303. Sealing bead two; 304. Spring four; 305. Moving block; 306. Pressure relief groove; 4. Circular oil groove; 5. Oil hole. Detailed Implementation

[0025] The following will be combined with the appendix Figure 1 To be continued Figure 5 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0026] It should be noted that, in the embodiments of this utility model, the directions shown in the accompanying drawings shall prevail, such as front and back. Figure 1 For the sake of accuracy, the specific details should be as follows: Figure 1 The left side is the front. Figure 1 The right side is the rear; at the same time, as Figure 2 As shown, the horizontal direction is roughly defined as left and right, and the vertical direction is defined as up and down. If a specific orientation changes, the directional indication will also change accordingly.

[0027] Reference Figures 1-5 As shown, this utility model provides an engine braking device, including a braking mechanism 1 and a rocker arm 2, wherein the braking mechanism 1 is mounted on the rocker arm 2, and a pressure relief component 3 is installed in the braking mechanism 1.

[0028] The braking mechanism 1 includes a housing 103, a fixing plate 114 is mounted on the bottom surface of the housing 103, a spring 112 is mounted on the end face of the fixing plate 114, and a push block 111 is mounted on the end face of the spring 112.

[0029] The pressure relief component 3 is installed on the push block 111. The pressure relief component 3 includes a moving block 305. The moving block 305 is installed on the bottom surface of the push block 111. A connecting cylinder 301 is installed on the end face of the moving block 305. The connecting cylinder 301 connects the top of the push block 111 and the interior of the moving block 305. Pressure relief grooves 306 are symmetrically opened on the lower side wall of the inner cavity of the moving block 305.

[0030] A spring 304 is installed on the bottom surface of the inner cavity of the movable block 305, a sealing bead 303 is installed on the top surface of the spring 304, and a fixed seat 101 is provided on the outer wall of the outer shell 103.

[0031] Other structural elements that work in conjunction with the braking device body 1 are not shown in the diagrams. They are identical to the structures shown in the patent with publication number CN214499193U and will not be described in detail here.

[0032] In a further embodiment, refer to Figures 1-4 The sealing bead 303 is in contact with the bottom surface of the connecting cylinder 301, and the moving block 305 slides against the fixed plate 114; a spring seat 102 is installed above the inner cavity of the outer shell 103, a spring 105 is installed on the bottom surface of the spring seat 102, and a valve stem 104 is installed at the bottom end of the spring 105; a mounting bracket 109 is installed in the middle of the inner cavity of the outer shell 103, a spring seat 110 is installed on the bottom surface of the mounting bracket 109, and a spring 113 is installed on the end face of the spring seat 110. A sealing bead 107 is installed on the end face of the second 113. A connecting groove 108 is opened on the end face of the mounting bracket 109, which connects the upper and lower sides of the outer shell 103. A connecting hole 115 is symmetrically opened on the upper part of the spring seat 110, which connects the upper and lower sides of the outer shell 103. An oil inlet 106 is opened on the side wall of the outer shell 103. An annular oil groove 4 and an oil hole 5 are provided on the upper part of the rocker arm 2. The annular oil groove 4 and the oil hole 5 are interconnected, and the annular oil groove 4 and the oil inlet 106 are interconnected.

[0033] In this embodiment, hydraulic oil is injected into the housing 103 through the oil hole 5, the annular oil groove 4 and the oil inlet 106. Then, the hydraulic oil pushes the valve stem 104 upward. As the pressure of the hydraulic oil rises, it pushes the sealing bead 107 downward. Then, the hydraulic oil flows downward from the connection hole 115. Then, the high-pressure oil pushes the push block 111 and the pressure relief component 3 downward, pushing the pressure relief component 3 downward.

[0034] The working principle of this utility model is as follows: When the device is in use, hydraulic oil is injected into the outer shell 103 through the oil hole 5, the annular oil groove 4 and the oil inlet 106. Then the hydraulic oil will push the valve stem 104 upward. As the pressure of the hydraulic oil rises, it will push the sealing bead 107 downward. Then the hydraulic oil will flow downward from the connection hole 115.

[0035] Subsequently, the high-pressure oil pushes the pusher block 111 and the pressure relief component 3 downward, pushing the pressure relief component 3 downward. If the pressure in the inner cavity of the outer shell 103 is too high, the internal hydraulic oil will push the sealing bead 2 303, causing the sealing bead 2 303 to compress the spring 4 304 downward, thereby connecting the inner cavity of the outer shell 103, the inner cavity of the connecting cylinder 301 and the inner cavity of the moving block 305. Then the hydraulic oil will flow out from the pressure relief groove 306.

[0036] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An engine braking device, comprising a braking mechanism (1) and a rocker arm (2), characterized in that, A braking mechanism (1) is installed on the rocker arm (2), and a pressure relief component (3) is installed in the braking mechanism (1). The braking mechanism (1) includes a housing (103), a fixing plate (114) is mounted on the bottom surface of the housing (103), a spring three (112) is mounted on the end face of the fixing plate (114), and a push block (111) is mounted on the end face of the spring three (112). The pressure relief component (3) is installed on the push block (111). The pressure relief component (3) includes a moving block (305). The moving block (305) is installed on the bottom surface of the push block (111). A connecting cylinder (301) is installed on the end face of the moving block (305). The connecting cylinder (301) connects the top of the push block (111) and the interior of the moving block (305). The moving block (305) has pressure relief grooves (306) symmetrically opened on the lower side wall of the inner cavity. The bottom surface of the inner cavity of the movable block (305) is equipped with a spring four (304), and the top surface of the spring four (304) is equipped with a sealing bead two (303).

2. The engine braking device according to claim 1, characterized in that: The closed bead (303) is in contact with the bottom surface of the connecting cylinder (301), and the moving block (305) slides against the fixed plate (114).

3. The engine braking device according to claim 1, characterized in that: A spring seat (102) is installed above the inner cavity of the outer shell (103), a spring (105) is installed on the bottom surface of the spring seat (102), and a valve stem (104) is installed at the bottom end of the spring (105).

4. An engine braking device according to claim 3, characterized in that: A mounting bracket (109) is installed in the middle of the inner cavity of the outer shell (103). A second spring seat (110) is installed on the bottom surface of the mounting bracket (109). A second spring (113) is installed on the end face of the second spring seat (110). A first sealing bead (107) is installed on the end face of the second spring (113). A first connecting groove (108) is opened on the end face of the mounting bracket (109). The first connecting groove (108) connects the upper and lower sides of the outer shell (103).

5. An engine braking device according to claim 4, characterized in that: The spring seat 2 (110) has symmetrically provided connecting holes (115) on its upper side, and the connecting holes (115) connect the upper and lower sides of the outer shell (103).

6. An engine braking device according to claim 1, characterized in that: The outer casing (103) has an oil inlet (106) on its side wall, and the rocker arm (2) has an oil groove (4) and an oil hole (5) on its upper side. The oil groove (4) and the oil hole (5) are connected to each other, and the oil groove (4) and the oil inlet (106) are connected to each other.

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