Brake rocker arm, engine and vehicle
By designing a brake rocker arm with ball valve sealing and oil drainage station switching, the problem of oil drainage in the engine brake oil circuit is solved, and the oil drainage during engine braking is achieved, ensuring the normal operation and service life of the engine.
Patent Information
- Application Number
- CN202420926837.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-29
AI Technical Summary
On the premise of ensuring the engine braking effect, how to conveniently achieve oil drainage in the engine braking oil circuit and prevent oil leakage has become a technical difficulty to solve the problem of oil drainage in the brake oil circuit.
A brake rocker arm is designed, including the rocker arm body, valve bridge device and brake device. Through the sealing of the ball valve and switching of the oil drain station, the engine oil in the oil chamber is discharged during engine braking, ensuring oil drainage. Effect.
While ensuring the engine braking effect, oil drainage in the engine braking oil circuit is achieved, oil leakage is avoided, and engine oil leakage is extended, and the service life of the engine is extended.
Smart Images
Figure CN222184874U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to a brake rocker arm, an engine and a vehicle. Background Art
[0002] When the vehicle encounters conditions such as going down a long slope, in order to prevent the frequent use of the vehicle brakes from increasing the wear of the vehicle brakes or even causing the vehicle brakes to fail, it is necessary to use the engine brake oil circuit for braking.
[0003] However, in order to improve braking efficiency and prevent oil leakage in the brake oil circuit during engine braking, the ports of the internal oil circuit of the brake rocker arm are usually equipped with one-way valves. Oil leakage in the brake oil circuit after engine braking becomes a technical difficulty.
[0004] Therefore, how to conveniently achieve oil drainage of the engine brake oil circuit while ensuring the engine braking effect has become a technical problem to be solved urgently in the field. Utility Model Content
[0005] The purpose of the utility model is at least to solve how to conveniently drain the engine brake oil circuit under the premise of ensuring the engine braking effect. This purpose is achieved through the following technical solutions:
[0006] In the first aspect, the utility model proposes a brake rocker arm, which is installed in an engine, and the brake rocker arm comprises: a rocker arm body, comprising a first end and a second end arranged oppositely, the first end being used to cooperate with a cam, and the second end being provided with an elephant foot, and along the length direction of the rocker arm body, an axial hole for installing a rocker arm shaft is provided between the first end and the second end, and an oil chamber is provided between the axial hole and the second end; an internal oil passage, located inside the rocker arm body, and used to connect the brake oil circuit of the engine with the oil chamber; a valve bridge device, comprising a valve bridge body and an actuator pin, one end of the valve bridge body being provided with an actuator pin, the actuator pin being able to move relative to the valve bridge body in a direction close to the brake valve to open the brake valve, and the valve bridge body being able to drive the actuator pin to move together in a direction close to the brake valve to open all exhaust valves; And a braking device, including a spring, a plunger and a ball valve; the spring extends along a first direction, the first end of the spring is fixedly connected to the first end of the oil chamber, and the second end of the spring is fixedly connected to the plunger; the plunger is used to block the oil chamber, and an oil drain hole is provided at one end of the plunger close to the actuator pin; the ball valve has a blocking position and an oil drain position, when the ball valve is in the blocking position, the ball valve blocks the oil drain hole; when the ball valve is in the oil drain position, there is a gap between the ball valve and the oil drain hole; the ball valve is also used to abut against the actuator pin; the braking rocker arm has an initial state; when the braking rocker arm is in the initial state, there is a gap between the elephant foot and the valve bridge body, and the distance between the elephant foot and the valve bridge body is greater than the distance between the braking device and the actuator pin, the ball valve is in the blocking position, and the valve bridge body and the actuator pin are both stationary relative to the brake valve.
[0007] For this type of brake rocker arm, when the vehicle does not start the engine braking mode, that is, when the engine is working normally: no oil flows into the oil chamber, and the working process of the brake rocker arm begins when the brake rocker arm is in the initial state, and as the camshaft rotates, the driving rocker arm also rotates. When the brake rocker arm is in the initial state, there is a gap between the elephant foot and the valve bridge body, and the distance between the elephant foot and the valve bridge body is greater than the distance between the brake device and the actuator pin, the ball valve will first contact the actuator pin, but because the ball valve is in the sealing position and the blockage is connected to the spring, when the ball valve presses the actuator pin, the spring will be compressed, and the actuator pin will not move relative to the valve bridge body toward the brake valve, and the brake valve will not open; then, as the camshaft continues to rotate, the elephant foot gradually approaches the valve bridge body until it abuts against the valve bridge body, and drives the actuator pin to move toward the brake valve to open all exhaust valves. When the vehicle starts the engine braking mode: the engine oil in the brake oil circuit will enter the oil chamber through the internal oil channel until the oil chamber is filled. At this time, the working process of the brake rocker arm begins when the brake rocker arm is in the initial state. As the camshaft rotates, the driving rocker arm also rotates. When the brake rocker arm is in the initial state, there is a gap between the elephant foot and the valve bridge body, and the distance between the elephant foot and the valve bridge body is greater than the distance between the brake device and the actuator pin. First, the ball valve contacts the actuator pin. At this time, the ball valve is in the blocking position and the oil chamber is full of engine oil. The oil chamber and the spring, plunger and ball valve in the oil chamber can be regarded as a rigid part as a whole. The ball valve will press downward against the actuator pin. The pin is applied with force, so that the actuator pin moves relative to the valve bridge body toward the brake valve until the brake valve opens, thereby releasing air from the engine and achieving the effect of engine braking. Then, as the camshaft continues to rotate, the elephant foot gradually approaches the valve bridge body until it abuts against the valve bridge body, and drives the actuator pin to move toward the brake valve. Since the valve bridge body drives the actuator pin to move together, the lower end of the ball valve loses the support force of the actuator pin, and the ball valve moves downward relative to the plunger. A gap appears between the ball valve and the oil drain hole, that is, the ball valve is in the oil drain position, and the oil in the oil chamber is leaked from the oil drain hole. Therefore, this type of brake rocker arm can conveniently drain the engine brake oil circuit while ensuring the engine braking effect.
[0008] In some embodiments of the utility model, the brake rocker arm also has a braking state and an oil leakage state; when the brake rocker arm is in the braking state, there is a gap between the elephant foot and the valve bridge, the ball valve is in the blocking position and abuts against the actuator pin, the brake valve is in an open state, and the valve bridge body is stationary relative to the brake valve; when the brake rocker arm is in the oil leakage state, the elephant foot abuts against the valve bridge, there is a gap between the ball valve and the actuator pin, and the ball valve is in the oil leakage position, and all exhaust valves are in an open state.
[0009] In some embodiments of the utility model, the internal oil channel includes: a first oil channel, one end of which is provided with a first one-way valve for discharging air in the oil chamber, and the other end is connected to the oil chamber; a second oil channel, one end of which is connected to the brake oil circuit of the engine through the oil inlet hole on the inner wall of the shaft hole, and the other end is provided with a first ball plug, and the second oil channel is provided with a second one-way valve for preventing the engine oil from flowing back from the oil inlet hole to the brake oil circuit; and a third oil channel, one end of which is connected to the oil chamber, the other end is provided with a second ball plug, and the third oil channel is connected to the second oil channel.
[0010] In some embodiments of the present invention, the actuator pin has a boss, and one end of the valve bridge body is sleeved on the outer wall of the actuator pin and abuts against a surface of the boss on a side away from the brake valve.
[0011] In some embodiments of the present invention, the elephant foot is mounted on the rocker arm body by screws.
[0012] In some embodiments of the present utility model, the actuator pin includes a force-bearing surface, which is located at an end of the actuator pin away from the brake valve, and the force-bearing surface is provided with an arc groove that matches the outer surface of the ball valve.
[0013] In some embodiments of the present invention, the actuator pin further includes a force applying surface, which is located on a side of the actuator pin away from the force receiving surface, and the force applying surface is used to abut against an upper seat of a valve spring of the brake valve.
[0014] In some embodiments of the present utility model, the force application surface is provided with a slide groove for cooperating with a valve stem of the brake valve, and the slide groove extends along the first direction.
[0015] In a second aspect, the utility model proposes an engine, comprising an engine body and any one of the above-mentioned brake rocker arms, wherein the brake rocker arm is used to drive a brake valve to open to achieve the function of engine braking.
[0016] In a third aspect, the utility model provides a vehicle, comprising the above-mentioned engine.
[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0019] Figure 1 A cross-sectional view of the cooperation between the brake rocker arm and the brake valve provided in the embodiment of the utility model;
[0020] Figure 2 A cross-sectional view of a rocker arm body in a brake rocker arm provided in an embodiment of the utility model;
[0021] Figure 3 A schematic diagram of the flow path of the engine oil in the internal oil channel of the brake rocker arm provided by an embodiment of the utility model;
[0022] Figure 4 A cross-sectional view of an actuator pin in a brake rocker arm provided in an embodiment of the utility model.
[0023] The reference numerals are as follows:
[0024] 100. Braking rocker arm;
[0025] 1. Rocker arm body; 11. Elephant foot; 12. Shaft hole; 121. Oil inlet hole; 13. Oil chamber;
[0026] 21, first oil passage; 211, first one-way valve; 22, second oil passage; 221, first ball plug; 222, second one-way valve; 223, return spring; 23, third oil passage; 231, second ball plug;
[0027] 31. valve bridge body; 32. actuator pin; 321. boss; 322. force-bearing surface; 3221. arc groove; 323. force-applying surface; 3231. slide groove;
[0028] 41. Spring; 42. Plunger; 43. Ball valve;
[0029] 51. Screw; 52. Nut;
[0030] 61. Exhaust valve; 62. Brake valve; 63. Valve spring; 64. Valve spring upper seat. DETAILED DESCRIPTION
[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0032] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.
[0033] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.
[0034] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.
[0035] Figure 1 A cross-sectional view of the cooperation between the brake rocker arm and the brake valve provided in the embodiment of the utility model; Figure 2 A cross-sectional view of a rocker arm body in a brake rocker arm provided in an embodiment of the utility model; Figure 1 and Figure 2As shown, the embodiment of the utility model provides a brake rocker arm 100, which is installed in an engine. The brake rocker arm 100 includes: a rocker arm body 1, including a first end and a second end arranged oppositely, the first end is used to cooperate with a cam, and the second end is provided with an elephant foot 11, along the length direction of the rocker arm body 1, an axial hole 12 for installing a rocker arm shaft is provided between the first end and the second end, and an oil chamber 13 is provided between the axial hole 12 and the second end; an internal oil channel, located inside the rocker arm body 1, for connecting the brake oil circuit of the engine with the oil chamber 13; a valve bridge device, including a valve bridge body 31 and an actuator pin 32, one end of the valve bridge body 31 is provided with an actuator pin 32, the actuator pin 32 can move relative to the valve bridge body 31 in a direction close to the brake valve 62 to open the brake valve 62, and the valve bridge body 31 can drive the actuator pin 32 to move together in a direction close to the brake valve 62 to open all exhaust valves 61; and a braking device, including Spring 41, plunger 42 and ball valve 43; spring 41 extends along a first direction, a first end of spring 41 is fixedly connected to a first end of oil chamber 13, and a second end of spring 41 is fixedly connected to plunger 42; plunger 42 is used to block oil chamber 13, and an oil drain hole is provided at one end of plunger 42 close to execution pin 32; ball valve 43 has a blocking position and an oil drain position, when ball valve 43 is in the blocking position, ball valve 43 blocks the oil drain hole; when ball valve 43 is in the oil drain position, there is a gap between ball valve 43 and the oil drain hole; ball valve 43 is also used to abut against execution pin 32; brake rocker arm 100 has an initial state, when brake rocker arm 100 is in the initial state, there is a gap between elephant foot 11 and valve bridge body 31, and the distance between elephant foot 11 and valve bridge body 31 is greater than the distance between brake device and execution pin 32, ball valve 43 is in the blocking position, valve bridge body 31 and execution pin 32 are both stationary relative to brake valve 62.
[0036] The engine has multiple exhaust valves, and the brake valve is one of the multiple exhaust valves of the engine, which is opened when the engine is braked to achieve engine deflation. For the sake of distinction, in all embodiments of the present application, the exhaust valve used to achieve engine deflation is referred to as the brake valve 62, and other exhaust valves that cannot achieve the engine deflation effect are simply referred to as exhaust valves 61.
[0037] The brake rocker arm 100 provided in this embodiment, when the vehicle does not start the engine brake mode, that is, when the engine is working normally: no oil flows into the oil chamber 13, and the working process of the brake rocker arm 100 is introduced from the initial state. As the camshaft rotates, the driving rocker arm also rotates. When the brake rocker arm 100 is in the initial state, there is a gap between the elephant foot 11 and the valve bridge body 31, and the distance between the elephant foot 11 and the valve bridge body 31 is greater than the distance between the brake device and the actuator pin 32. First, the ball valve 4 3 will contact the actuator pin 32, but because the ball valve 43 blocks the working position and is connected to the spring 41, when the ball valve 43 presses the actuator pin 32, the spring 41 will be compressed, and the actuator pin 32 will not move relative to the valve bridge body 31 in the direction close to the brake valve 62, and the brake valve 62 will not open; then, as the camshaft continues to rotate, the elephant foot 11 gradually approaches the valve bridge body 31 until it abuts against the valve bridge body 31, and drives the actuator pin 32 to move in the direction close to the brake valve 62 to open all the exhaust valves 61.
[0038] When the vehicle starts the engine braking mode: the engine oil in the brake oil circuit will enter the oil chamber 13 through the internal oil channel until the oil chamber 13 is filled. At this time, the working process of the brake rocker arm 100 is introduced from when the brake rocker arm 100 is in the initial state. As the camshaft rotates, the driving rocker arm also rotates. When the brake rocker arm 100 is in the initial state, there is a gap between the elephant foot 11 and the valve bridge body 31, and the distance between the elephant foot 11 and the valve bridge body 31 is greater than the distance between the brake device and the actuator pin 32. First, the ball valve 43 contacts the actuator pin 32. At this time, the ball valve 43 is in the blocking position and the oil chamber 13 is filled with engine oil. The oil chamber 13 and the spring 41, plunger 42 and ball valve 43 in the oil chamber 13 can be regarded as a rigid part as a whole. The ball valve 43 will move to A force is applied to the actuator pin 32 downward, so that the actuator pin 32 moves relative to the valve bridge body 31 toward the brake valve 62 until the brake valve 62 opens, thereby deflating the engine and achieving the effect of engine braking; then, as the camshaft continues to rotate, the elephant foot 11 gradually approaches the valve bridge body 31 until it abuts against the valve bridge body 31, and drives the actuator pin 32 to move toward the brake valve 62. Since the valve bridge body 31 drives the actuator pin 32 to move together, the lower end of the ball valve 43 loses the supporting force of the actuator pin 32, and the ball valve 43 moves downward relative to the plunger 42. A gap appears between the ball valve 43 and the oil drain hole, that is, the ball valve 43 is in the oil drain position. At this time, the engine oil in the oil chamber 13 is drained from the oil drain hole.
[0039] Therefore, the braking rocker arm 100 can conveniently realize the oil draining of the engine braking oil circuit while ensuring the engine braking effect.
[0040] According to an optional embodiment of the present application, the braking rocker arm 100 also has a braking state and an oil leakage state; when the braking rocker arm 100 is in the braking state, there is a gap between the elephant foot 11 and the valve bridge, the ball valve 43 is in the blocking position and abuts against the execution pin 32, the brake valve 62 is in an open state, and the valve bridge body 31 is stationary relative to the brake valve 62; when the braking rocker arm 100 is in the oil leakage state, the elephant foot 11 abuts against the valve bridge, there is a gap between the ball valve 43 and the execution pin 32, and the ball valve 43 is in the oil leakage position, and all exhaust valves 61 are in an open state.
[0041] In this embodiment, the working process of the brake rocker arm 100 is described in more detail in the vehicle engine braking mode:
[0042] When the vehicle starts the engine braking mode and the oil chamber 13 is filled with engine oil, the working process of the brake rocker arm 100 is introduced from the time when the brake rocker arm 100 is in the initial state. As the camshaft rotates, the driving rocker arm also rotates. First, the ball valve 43 contacts the actuator pin 32. Since the ball valve 43 is in the blocking position and the oil chamber 13 is filled with engine oil, the oil chamber 13 and the spring 41, plunger 42 and ball valve 43 in the oil chamber 13 can be regarded as a rigid part as a whole. The ball valve 43 will exert force downward on the actuator pin 32, so that the actuator pin 32 moves relative to the valve bridge body 31 in the direction close to the brake valve 62 until the brake valve 62 is opened to achieve the engine degassing, thereby achieving the effect of engine braking; at this time, the elephant foot 11 has not yet contacted the valve bridge body 31, and there is always a gap between the elephant foot 11 and the valve bridge. The valve bridge body 31 remains stationary relative to the brake valve 62, and the brake rocker arm 100 is in a braking state.
[0043] Then, as the camshaft continues to rotate, the elephant foot 11 gradually approaches the valve bridge body 31 until it abuts against the valve bridge body 31, and drives the actuator pin 32 to move toward the direction close to the brake valve 62. Since the valve bridge body 31 drives the actuator pin 32 to move together, the lower end of the ball valve 43 will lose the support force of the actuator pin 32, and the ball valve 43 will move downward relative to the plunger 42. A gap will appear between the ball valve 43 and the oil drain hole, that is, the ball valve 43 is in the oil drain position. At this time, the engine oil in the oil chamber 13 is leaked from the oil drain hole, all the exhaust valves 61 are in the open state, and the brake rocker arm 100 is in the oil drain state.
[0044] Figure 3 Schematic diagram of the flow path of the oil in the internal oil channel of the brake rocker arm provided by the embodiment of the utility model, refer to Figure 1-Figure 3According to an optional embodiment of the present application, the internal oil passage includes: a first oil passage 21, one end of the first oil passage 21 is provided with a first one-way valve 211 for discharging air in the oil chamber 13, and the other end is connected to the oil chamber 13; a second oil passage 22, one end of the second oil passage 22 is connected to the brake oil circuit of the engine through the oil inlet hole 121 on the inner wall of the shaft hole 12, and the other end is provided with a first ball plug 221, and the second oil passage 22 is provided with a second one-way valve 222 for preventing the engine oil from flowing back from the oil inlet hole 121 to the brake oil circuit; and a third oil passage 23, one end of the third oil passage 23 is connected to the oil chamber 13, and the other end is provided with a second ball plug 231, and the third oil passage 23 is connected to the second oil passage 22.
[0045] The second one-way valve 222 may be equipped with a reset spring 223 to achieve its own reset, so as to prevent the inflow of engine oil from causing the position of the second one-way valve 222 to change and thus affecting the engine oil from finally flowing into the oil chamber 13 .
[0046] In this embodiment, when the vehicle starts the engine braking mode, the engine oil flows into the internal oil channel of the rocker arm body 1 through the oil inlet hole 121 on the inner wall of the shaft hole 12 through the brake oil channel. The specific path of the engine oil flow is that it flows from the oil inlet hole 121 into the second oil channel 22, and then flows into the oil chamber 13 through the third oil channel 23. Figure 3 As shown in the direction of the middle arrow; due to the presence of the first one-way valve 211, the air in the oil chamber 13 can be discharged, thereby improving the efficiency of the engine oil filling the oil chamber 13 and increasing the overall pressure in the oil chamber 13; and the setting of the first ball plug 221, the second one-way valve 222 and the second ball plug 231 can prevent the engine oil in the oil chamber 13 from leaking out from places other than the oil drain hole, thereby ensuring that when the vehicle needs to turn on the engine braking mode, there is sufficient hydraulic pressure in the oil chamber 13, so that the oil chamber 13 and the spring 41, plunger 42 and ball valve 43 in the oil chamber 13 can be regarded as a rigid part as a whole, and the ball valve 43 can drive the execution pin 32 to move relative to the valve bridge body 31 in the direction close to the brake valve 62 until the brake valve 62 is opened, thereby ensuring that the effect of engine air discharge can be achieved.
[0047] In addition, a rocker shaft may be provided with a rocker shaft oil passage, one end of which is connected to the brake oil passage, and the other end is connected to the oil inlet hole 121 on the inner wall of the shaft hole 12; since the rocker arm rotates relative to the shaft hole 12 continuously during the operation of the vehicle, the rocker shaft oil passage and the oil inlet hole 121 on the inner wall of the shaft hole 12 will repeat the working cycle of "alignment, offset, re-alignment, and re-offset", so that part of the oil in the oil chamber 13 will leak out from the oil drain hole in each cycle. When the brake valve 62 is closed and the rocker shaft oil passage and the oil inlet hole 121 are aligned again, the oil supply to the oil chamber 13 can be realized again. If the engine braking is stopped, the brake oil circuit stops supplying oil, and the oil chamber 13 will not continue to flow into the oil chamber 13. After several working cycles, the oil in the oil chamber 13 will gradually leak out from the oil drain hole, and the engine will return to normal operation.
[0048] Therefore, with this arrangement, the oil in the oil chamber 13 will gradually leak out after it has played a role in engine braking, and will continue to fill the oil chamber 13 when engine braking is needed again, until the engine is stopped and then all the oil will slowly leak out of the oil chamber 13, thereby preventing the valve from falling too fast due to excessive oil accumulation and allocating it all at once, thereby improving the service life of the engine to a certain extent.
[0049] Figure 4 A cross-sectional view of an actuator pin in a brake rocker arm provided by an embodiment of the utility model, as shown in FIG. Figure 1 and Figure 4 As shown, according to an optional embodiment of the present application, the actuator pin 32 has a boss 321, and one end of the valve bridge body 31 is sleeved on the outer wall of the actuator pin 32 and abuts against the surface of the boss 321 facing away from the brake valve 62.
[0050] Among them, a protective pad, such as a rubber pad, can be arranged between the surface of the boss 321 facing away from the brake valve 62 and the valve bridge body 31 to protect the valve bridge body 31 and the boss 321, and to a certain extent reduce the damage to the fitting surfaces of the two caused by repeated pressure exerted by the valve bridge body 31 on the boss 321.
[0051] In this embodiment, since the valve bridge body 31 abuts against the surface of the boss 321 on the side facing away from the brake valve 62, when the valve bridge moves toward the valve, the boss 321 of the actuator pin 32 can be pressed to drive the actuator pin 32 to move together, so that the valve bridge body 31 drives the actuator pin 32 to move together in the direction close to the brake valve 62 to open all the exhaust valves 61; and since the lower end of the actuator pin 32 has no contact with the valve bridge body 31, the actuator pin 32 can realize the movement of the actuator pin 32 relative to the valve bridge body 31 in the direction close to the brake valve 62 to open the brake valve 62 alone.
[0052] This way of cooperating the actuator pin 32 with the valve bridge body 31 has a simple structure and is easy to assemble. It can also realize the joint movement of the actuator pin 32 driven by the valve bridge body 31 and the independent movement of the actuator pin 32 relative to the valve bridge body 31, thereby ensuring the working requirements of the brake rocker arm 100.
[0053] like Figure 1 As shown, according to an optional embodiment of the present application, the elephant foot 11 is mounted on the rocker arm body 1 by means of screws 51 .
[0054] Among them, the screw 51 can pass through the second end of the rocker arm body 1, the elephant foot 11 is fixedly installed on the lower end of the screw 51, and the upper end of the screw 51 cooperates with the nut 52 to press the upper surface of the rocker arm body 1, thereby realizing the fixed installation of the elephant foot 11 on the second end of the rocker arm body 1.
[0055] In this embodiment, the connection method of the screw 51 has low cost, stable connection, and is easy to disassemble, so it is convenient for repair and replacement of the elephant foot 11.
[0056] like Figure 1 and Figure 4 As shown, according to an optional embodiment of the present application, the actuator pin 32 includes a force surface 322, which is located at the end of the actuator pin 32 away from the brake valve 62, and the force surface 322 is provided with an arc groove 3221 that cooperates with the outer surface of the ball valve 43.
[0057] A sealing gasket, such as a rubber gasket, may be installed in the arc groove 3221 , which not only improves the sealing effect on the engine oil, but also protects the actuator pin 32 .
[0058] In this embodiment, when the ball valve 43 abuts the force-bearing surface 322 of the actuator pin 32, due to the presence of the arc groove 3221, it can completely fit with the surface below the ball valve 43, thereby improving the efficiency of pressure transmission and the relative stability between the ball valve 43 and the actuator pin 32.
[0059] refer to Figure 1 and Figure 4 According to an optional embodiment of the present application, the actuator pin 32 also includes a force application surface 323, which is located on the side of the actuator pin 32 away from the force receiving surface 322, and the force application surface 323 is used to abut against the valve spring upper seat 64 of the brake valve 62.
[0060] In this embodiment, when the actuator pin 32 moves downward relative to the valve bridge body 31, the force application surface 323 of the actuator pin 32 abuts against the valve spring upper seat 64 of the brake valve 62, thereby continuing to move downward to drive the valve spring 63 to compress, thereby realizing the opening of the brake valve 62.
[0061] Continue to refer Figure 1 and Figure 4 According to an optional embodiment of the present application, the force application surface 323 is provided with a slide groove 3231 for cooperating with the valve stem of the brake valve 62, and the slide groove 3231 extends along the first direction.
[0062] In this embodiment, when the actuator pin 32 moves downward relative to the valve bridge body 31, the actuator pin 32 moves along the extension direction of the slide groove 3231 until the force application surface 323 of the actuator pin 32 abuts against the valve spring upper seat 64 of the brake valve 62, thereby continuing to move downward to open the brake valve 62; the setting of the slide groove 3231 plays a guiding role in the moving path of the actuator pin 32, thereby facilitating the abutment between the force application surface 323 of the actuator pin 32 and the valve spring upper seat 64 of the brake valve 62.
[0063] The embodiment of the utility model further provides an engine, comprising an engine body and any one of the above-mentioned brake rocker arms 100 , wherein the brake rocker arm 100 is used to drive the brake valve 62 to open to realize the engine braking function.
[0064] In this embodiment, the beneficial effects of the engine body are the same as those of any of the above-mentioned brake rocker arms 100 , which are both capable of conveniently achieving oil drainage of the engine brake oil circuit while ensuring the engine braking effect.
[0065] An embodiment of the utility model further provides a vehicle, comprising the above-mentioned engine.
[0066] In this embodiment, the beneficial effects of the vehicle are the same as the beneficial effects of the above-mentioned engine and will not be described in detail.
[0067] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A brake rocker arm installed in an engine, characterized in that: The brake rocker arm comprises: The rocker arm body comprises a first end and a second end which are arranged opposite to each other, wherein the first end is used to cooperate with a cam, and the second end is provided with an elephant foot, and along the length direction of the rocker arm body, an axial hole for installing a rocker arm shaft is provided between the first end and the second end, and an oil chamber is provided between the axial hole and the second end; An internal oil passage, located inside the rocker arm body, for connecting the brake oil passage of the engine with the oil chamber; A valve bridge device, comprising a valve bridge body and an actuator pin, wherein one end of the valve bridge body is provided with the actuator pin, the actuator pin can move relative to the valve bridge body toward a brake valve to open the brake valve, and the valve bridge body can drive the actuator pin to move toward the brake valve to open all exhaust valves; and The braking device comprises a spring, a plunger and a ball valve; the spring extends along a first direction, the first end of the spring is fixedly connected to the first end of the oil chamber, and the second end of the spring is fixedly connected to the plunger; the plunger is used to block the oil chamber, and an oil drain hole is provided at one end of the plunger close to the execution pin; the ball valve has a blocking position and an oil drain position, and when the ball valve is in the blocking position, the ball valve blocks the oil drain hole; when the ball valve is in the oil drain position, there is a gap between the ball valve and the oil drain hole; the ball valve is also used to abut against the execution pin; The brake rocker arm has an initial state. When the brake rocker arm is in the initial state, there is a gap between the elephant foot and the valve bridge body, and the distance between the elephant foot and the valve bridge body is greater than the distance between the braking device and the actuator pin. The ball valve is in the blocking position, and the valve bridge body and the actuator pin are both stationary relative to the brake valve.
2. The brake rocker arm according to claim 1, characterized in that: The brake rocker arm also has a braking state and an oil drain state; When the brake rocker arm is in the braking state, there is a gap between the elephant foot and the valve bridge, the ball valve is in the blocking position and abuts against the actuator pin, the brake valve is in an open state, and the valve bridge body is stationary relative to the brake valve; When the brake rocker arm is in the oil leakage state, the elephant foot abuts against the valve bridge, there is a gap between the ball valve and the actuator pin, and the ball valve is in the oil leakage position, and all the exhaust valves are in the open state.
3. The brake rocker arm according to claim 1, characterized in that: The internal oil passage comprises: a first oil passage, wherein one end of the first oil passage is provided with a first one-way valve for discharging air in the oil chamber, and the other end of the first oil passage is communicated with the oil chamber; a second oil passage, one end of which is connected to the brake oil circuit of the engine through an oil inlet hole on the inner wall of the shaft hole, and the other end of which is provided with a first ball plug, and a second one-way valve is provided in the second oil passage for preventing the oil from flowing back from the oil inlet hole to the brake oil circuit; and A third oil passage, one end of which is communicated with the oil chamber, and the other end of which is provided with a second ball plug, and the third oil passage is communicated with the second oil passage.
4. The brake rocker arm according to claim 1, characterized in that: The actuating pin has a boss, and one end of the valve bridge body is sleeved on the outer wall of the actuating pin and abuts against a surface of the boss on a side away from the brake valve.
5. The brake rocker arm according to claim 1, characterized in that: The elephant foot is mounted on the rocker arm body by screws.
6. The brake rocker arm according to any one of claims 1 to 5, characterized in that: The actuator pin comprises a force-bearing surface, the force-bearing surface is located at an end of the actuator pin away from the brake valve, and the force-bearing surface is provided with an arc groove matched with the outer surface of the ball valve.
7. The brake rocker arm according to claim 6, characterized in that: The actuating pin further comprises a force applying surface, which is located at a side of the actuating pin away from the force receiving surface, and the force applying surface is used for abutting against an upper seat of a valve spring of the brake valve.
8. The brake rocker arm according to claim 7, characterized in that: The force application surface is provided with a slide groove for cooperating with the valve stem of the brake valve, and the slide groove extends along the first direction.
9. An engine, characterized in that: It comprises an engine body and a brake rocker arm as described in any one of claims 1 to 8, wherein the brake rocker arm is used to drive a brake valve to open to achieve the function of engine braking.
10. A vehicle, characterized in that: Comprising the engine as claimed in claim 9.