Rocker arm brake with elastically fixed engine and engine thereof

Abstract

The utility model relates to the technical field of engines, in particular to a rocker arm brake with an elastically fixed engine and the engine thereof, which comprises a brake rocker arm, a brake cam, a piston, a spherical gasket and a spring, a pressing hole communicated with a shaft hole is arranged on the outer wall of the brake rocker arm, and a flaring hole is arranged at one end of the pressing hole far away from the shaft hole. The pressing rod is fixedly connected with the rocker arm shaft, the spherical end of the spherical gasket is matched with the flaring hole, the ring hole of the spherical gasket is arranged outside the pressing rod in a sleeving mode, and when braking is closed, the spring enables the spherical gasket to press the flaring hole, so that the braking rocker arm is fixed, extra abrasion and noise generated by swinging of the braking rocker arm when braking is closed are avoided, and the service life of the braking rocker arm is prolonged. The spherical surface end of the spherical gasket is matched with the flaring hole, the elastic force of the spring can be applied to the brake rocker arm relatively uniformly, a certain self-positioning function is achieved, the spherical gasket can deflect in a self-adaptive mode, and clamping stagnation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an elastically fixed rocker arm brake of an engine, and also to an engine comprising the elastically fixed rocker arm brake of the engine. Background Art

[0002] The working principle of the engine rocker arm brake is mainly based on the pressure difference generated when the engine is exhausted to achieve the braking effect. When braking, the brake cam rotates with the camshaft, driving the brake rocker arm to rotate around the rocker arm shaft, so that the engine rocker arm drives the brake valve to open. When the engine is in positive power, the brake is closed, and the lift of the brake cam will not be transmitted to the brake valve through the brake rocker arm;

[0003] Since the brake rocker arm is prone to swing when the engine is in a positive power state, a Chinese patent with publication number CN215761845U discloses an energy-saving and consumption-reducing engine braking device, which proposes a method of connecting an auxiliary rocker arm (brake rocker arm) to an engine cylinder head through an elastic component to achieve elastic fixing of the brake rocker arm when the engine is not braking;

[0004] However, this type of elastic component is not only complex in structure and difficult to assemble, but the heat in the cylinder can also be easily transferred to the elastic component, causing thermal stress deformation of the elastic component, affecting the performance and stability of the braking device, and causing excessive or uneven force on the cylinder head, thereby affecting the service life and performance of the components. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to solve the deficiencies in the prior art, a rocker arm brake with elastic fixation of an engine is provided, and also relates to an engine comprising the rocker arm brake with elastic fixation of the engine.

[0006] The utility model solves the technical problem by adopting a technical solution: a rocker arm brake with elastic fixing of an engine, comprising:

[0007] A brake rocker arm, having an axial hole sleeved on the rocker shaft of the engine and rotatably connected to the rocker shaft, a cam follower structure is provided on one side of the rocker shaft of the brake rocker arm, and a piston hole is provided on the other side of the rocker shaft, a clamping hole connected to the axial hole is provided on the outer wall of the brake rocker arm, and an end of the clamping hole away from the axial hole has an expanded hole that gradually becomes smaller along the direction from the clamping hole to the axial hole, and the expanded hole is a spherical hole or a conical hole;

[0008] A brake cam, used to cooperate with the cam follower structure, wherein the brake cam is mounted on the camshaft of the engine and is spaced apart from the cam follower structure;

[0009] A piston is spaced apart from a brake valve of the engine, the piston is telescopically mounted in the piston hole, and is used to abut against the brake valve to rotate the brake rocker arm until the cam follower structure contacts the brake cam, and the rocker arm shaft is located between the cam follower structure and the piston;

[0010] A clamping rod passes through the clamping hole and is fixedly connected to the rocker arm shaft;

[0011] A spherical washer, the spherical end of which matches the expanded hole, and the circle hole of which is sleeved outside the pressing rod;

[0012] And a spring, one end of the spring abuts against the clamping rod, and the other end abuts against the spherical washer, so that the spherical end of the spherical washer is pressed into the expanded hole, and a gap is left between the inner wall of the circle hole and the inner wall of the clamping hole and the side wall of the clamping rod close to the piston.

[0013] Furthermore, a gap is left between a side wall of the clamping rod close to the brake cam and an inner wall of the clamping hole;

[0014] Alternatively, a side wall of the clamping rod close to the brake cam contacts the inner wall of the clamping hole.

[0015] Furthermore, the clamping rod has a protrusion, the spring is sleeved outside the clamping rod, one end of the spring abuts against the protrusion, and the other end abuts against an end of the spherical washer away from the spherical end.

[0016] Furthermore, one end of the spring is fixedly connected to the protruding portion, and the other end of the spring is fixedly connected to an end of the spherical washer away from the spherical end.

[0017] Furthermore, the protrusion is integrally formed with the pressing rod or is fixedly connected with the pressing rod.

[0018] Furthermore, the clamping rod is threadedly connected to the rocker arm shaft.

[0019] Furthermore, an elastic element is provided on the brake rocker arm, and the elastic element is used to move the piston away from the brake valve;

[0020] When the oil in the piston hole causes the piston to overcome the elastic force of the elastic element, the piston extends and moves toward the brake valve.

[0021] Furthermore, the spring compresses the spherical washer to elastically press against the inner wall of the expanded hole, so that the clamping rod contacts the hole wall on one side of the clamping hole close to the cam follower structure, and a gap is formed between the hole wall on one side of the clamping hole close to the piston and the clamping rod.

[0022] Furthermore, the expansion hole and the pressing hole are eccentrically arranged.

[0023] Furthermore, the axis of the expansion hole is closer to the cam follower structure than the axis of the clamping hole.

[0024] Furthermore, an outer wall of the brake rocker arm is provided with an end face hole toward the rocker arm shaft, and the expanded hole is provided at the bottom of the end face hole.

[0025] Furthermore, a spring cavity is formed at one end of the spherical washer away from the rocker shaft, and one end of the spring close to the rocker shaft abuts against the bottom of the spring cavity.

[0026] The utility model also provides an engine, comprising the above-mentioned elastically fixed rocker arm brake of the engine.

[0027] The beneficial effects of the utility model are as follows: when the engine brake is closed, the spring of the rocker arm brake of the engine elastically fixed by the utility model presses the spherical washer toward the rocker arm shaft direction, so that the spherical washer presses the expanded hole of the clamping hole, thereby fixing the brake rocker arm, avoiding additional wear and noise caused by swinging of the brake rocker arm when the brake is closed, and keeping a certain distance between the brake cam and the cam follower structure and not in contact, and keeping a certain distance between the piston and the brake valve and not in contact; the clamping rod passes through the clamping hole, and can also limit the rotation range of the brake rocker arm; the spring does not need to be connected to other parts of the engine, which can simplify the structure and assembly, reduce thermal stress problems, optimize force distribution, and help reduce noise and vibration, and improve reliability and temperature resistance.

[0028] In addition, the spherical end of the spherical washer cooperates with the expanded hole using a conical hole or a spherical hole, which can not only relatively evenly apply the elastic force of the spring to the brake rocker arm, but also has a certain self-positioning function. At the same time, when the brake cam drives the brake rocker arm to rotate, the spherical washer can better adapt to the deflection, avoid jamming, and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a schematic diagram of the rocker arm brake of the utility model with elastic fixing of the engine when the brake is closed;

[0031] Figure 2 yes Figure 1 A is a partial enlarged schematic diagram;

[0032] Figure 3 It is a schematic diagram of the piston being mounted on the brake rocker arm;

[0033] Figure 4 It is a three-dimensional schematic diagram of the rocker arm brake of the utility model with elastic fixation of the engine;

[0034] Figure 5It is a schematic diagram of the rocker arm brake of the utility model with elastic fixing of the engine when the brake is turned on;

[0035] Figure 6 yes Figure 5 A partial enlarged schematic diagram of B in the middle;

[0036] Figure 7 It is a schematic diagram of the brake rocker arm pushing the brake valve to open;

[0037] Figure 8 yes Figure 7 A partial enlarged schematic diagram of C in the middle.

[0038] In the figure: 1, brake cam; 2, brake rocker arm, 201, shaft hole, 202, cam follower structure, 203, piston hole, 204, clamping hole, 2041, expansion hole, 205, end hole;

[0039] 3. Compression rod, 301, protrusion;

[0040] 4. Piston, 401, inner hole, 402, limiter;

[0041] 5. spherical washer, 501. spherical end, 502. ring hole, 503. spring cavity;

[0042] 6. Spring;

[0043] 7. Rocker arm shaft, 8. Positive power cam, 9. Positive power rocker arm, 10. Valve bridge, 11. Brake valve, 12. Valve pin, 13. Non-brake valve, 14. Camshaft, 15. Elastic element, 16. Adjusting bolt. DETAILED DESCRIPTION

[0044] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0045] like Figure 1-8 As shown, an elastically fixed rocker arm brake of an engine comprises a brake rocker arm 2, a brake cam 1, a piston 4, a spherical washer 5 and a spring 6; the engine is a four-stroke engine, a part of the exhaust valves in the valve group of the engine are brake valves 11, and another part of the exhaust valves are non-brake valves 13;

[0046] The brake rocker arm 2 has an axial hole 201 sleeved on the rocker shaft 7 of the engine and is rotatably connected to the rocker shaft 7. A cam follower structure 202 is provided on one side of the rocker shaft 7 of the brake rocker arm 2, and a piston hole 203 is provided on the other side of the rocker shaft 7. A clamping hole 204 connected to the axial hole 201 is provided on the outer wall of the brake rocker arm 2. The end of the clamping hole 204 away from the axial hole 201 has an expanded hole 2041 that gradually becomes smaller along the direction from the clamping hole 204 to the axial hole 201. The expanded hole 2041 is a spherical hole or a conical hole. For example, the expanded hole 2041 can be a conical hole. The end of the expanded hole 2041 close to the rocker shaft 7 is connected to the end of the clamping hole 204 away from the rocker shaft 7, and they are connected to each other.

[0047] The brake cam 1 is used to cooperate with the cam follower structure 202. The brake cam 1 is installed on the camshaft 14 of the engine. The brake cam 1 and the cam follower structure 202 are spaced apart. For example, the brake cam 1 has a base circle and a brake lift boss. The brake lift boss protrudes from the base circle. The brake cam 1 is located on one side of the positive cam 8 of the camshaft 14 of the engine. The positive cam 8 and the brake cam 1 are driven to rotate by the camshaft 14. Specifically, the brake cam 1 has two brake lift bosses, namely, a brake BGR lift boss and a brake CR lift boss. The brake BGR lift boss is used to enable the brake valve 11 to perform an exhaust gas recirculation operation to compress more gas. The brake CR lift boss is used to perform a compression release operation to achieve braking. During braking, the brake cam 1 rotates one circle with the camshaft 14, and the base circle and the brake lift boss will pass through the cam follower structure 202 one by one.

[0048] The cam follower structure 202 may be the outer wall surface of the end of the brake rocker arm 2 away from the piston hole 203. At this time, when the brake cam 1 and the cam follower structure 202 are matched, the brake cam 1 and the outer wall surface of the cam follower structure 202 are in contact, and the brake cam 1 and the cam follower structure 202 can be regarded as sliding fit;

[0049] The cam follower structure 202 can also be a roller rotatably mounted on the brake rocker arm 2. In this case, when the brake cam 1 and the cam follower structure 202 are matched, the brake cam 1 and the roller of the cam follower structure 202 are in contact, and the brake cam 1 and the cam follower structure 202 can be regarded as rolling matching;

[0050] The piston 4 is spaced apart from the brake valve 11 of the engine. The piston 4 is telescopically installed in the piston hole 203 and is used to abut the brake valve 11 to rotate the brake rocker arm 2 until the cam follower structure 202 contacts the brake cam 1. The rocker arm shaft 7 is located between the cam follower structure 202 and the piston 4. The valve bridge 10 of the engine is located below the piston 4. A valve pin 12 is fixed to the upper end of the brake valve 11. The valve pin 12 is movably installed on the valve bridge 10 and protrudes upward from the upper surface of the valve bridge 10. When the piston 4 moves, the brake valve 11 is driven to move by pushing the valve pin 12.

[0051] The clamping rod 3 passes through the clamping hole 204 and is fixedly connected to the rocker shaft 7;

[0052] The spherical end 501 of the spherical washer 5 matches the expanded hole 2041, and the circle hole 502 of the spherical washer 5 is sleeved outside the pressing rod 3;

[0053] One end of the spring 6 presses against the clamping rod 3, and the other end presses against the spherical washer 5, so that the spherical end 501 of the spherical washer 5 is pressed into the expanded hole 2041, and a gap is left between the inner wall of the circle hole 502 and the inner wall of the clamping hole 204 and the side wall of the clamping rod 3 close to the piston 4; the spring 6 can be a compression spring or a wave spring.

[0054] In this embodiment, when the engine brake is turned off, the spring 6 presses the spherical washer 5 toward the rocker arm shaft 7, so that the spherical washer 5 presses the expanded hole 2041 of the clamping hole 204, thereby fixing the brake rocker arm 2, avoiding additional wear and noise caused by the swing of the brake rocker arm 2 when the brake is turned off, and keeping a certain distance between the brake cam 1 and the cam follower structure 202 and the piston 4 and the brake valve 11; the clamping rod 3 passes through the clamping hole 204, and can also limit the rotation range of the brake rocker arm 2; the spring 6 does not need to be connected to the cylinder head of the engine, which can simplify the structure and assembly, reduce thermal stress problems, optimize force distribution, and help reduce noise and vibration, and improve reliability and temperature resistance.

[0055] In addition, the spherical end 501 of the spherical washer 5 cooperates with the expanded hole 2041 using a conical hole or a spherical hole, which can not only relatively evenly apply the elastic force of the spring 6 to the brake rocker arm 2, but also has a certain self-positioning function. At the same time, when the brake cam 1 drives the brake rocker arm 2 to rotate, the spherical washer 5 can better adaptively deflect to avoid jamming and increase the service life.

[0056] When the engine rocker arm brake device is braking, the piston 4 in the piston hole 203 extends toward the brake valve 11, and the brake rocker arm 2 forces the spring 6 to be further compressed and rotated, so that the cam follower structure 202 can contact the brake cam 1, and then the brake cam 1 drives the brake rocker arm 2, and the brake rocker arm 2 rotates around the rocker arm shaft 7. The piston 4 that rotates with the brake rocker arm 2 pushes the brake valve 11 to move, so as to open the brake valve 11;

[0057] In some examples, a gap is left between the side wall of the clamping rod 3 close to the brake cam 1 and the inner wall of the clamping hole 204, that is, the diameter of the clamping hole 204 is larger than the outer diameter of the clamping rod 3, and the cross-sections of the clamping hole 204 and the flared hole 2041 can be circular and coaxially arranged with each other, so that processing is convenient;

[0058] Alternatively, the side wall of the clamping rod 3 close to the brake cam 1 contacts the inner wall of the clamping hole 204, which can improve the stability of the brake rocker arm 2 in the non-braking state.

[0059] In some examples, the clamping rod 3 has a protrusion 301, and the spring 6 is sleeved outside the clamping rod 3 to prevent the spring 6 from being distorted significantly. One end of the spring 6 abuts against the protrusion 301, and the other end abuts against an end of the spherical washer 5 away from the spherical end 501.

[0060] One end of the spring 6 may directly contact the protrusion 301 but not be fixedly connected, and the other end may directly contact the end of the spherical washer 5 away from the spherical end 501 but not be fixedly connected; or one end of the spring 6 may be fixedly connected to the protrusion 301, and the other end may be fixedly connected to the end of the spherical washer 5 away from the spherical end 501;

[0061] The clamping rod 3 can be specifically a bolt, and the head of the bolt is a protrusion 301;

[0062] The protrusion 301 is integrally formed with or fixedly connected to the pressing rod 3 , that is, the protrusion 301 can be integrally formed with the pressing rod 3 , or the protrusion 301 is fixed to the pressing rod 3 by threaded connection, clamping, riveting or welding.

[0063] In some examples, the clamping rod 3 is threadedly connected to the rocker shaft 7 for easy replacement, and the spring 6 can increase the friction between the external thread of the clamping rod 3 and the internal thread of the rocker shaft 7 to prevent the clamping rod 3 from loosening.

[0064] In some examples, the brake rocker arm 2 is provided with an elastic element 15, and the elastic element 15 is used to move the piston 4 away from the brake valve 11;

[0065] When the oil in the piston hole 203 causes the piston 4 to overcome the elastic force of the elastic element 15 , the piston 4 extends and moves toward the brake valve 11 .

[0066] For example, the opening of the piston hole 203 of the brake rocker arm 2 faces the brake valve 11, and an adjusting bolt 16 is arranged between the piston 4 and the piston hole 203 to adjust the installation position of the piston 4 on the brake rocker arm 2. The piston 4 has an inner hole 401 opening upward, and the lower end of the adjusting bolt 16 extends into the inner hole 401 of the piston 4. The elastic element 15 can be a spring, and the elastic element 15 is sleeved outside the adjusting bolt 16. The upper end of the elastic element 15 abuts against the limiting member 402 at the upper end of the inner hole 401. The limiting member 402 can specifically be a spring retaining ring, and the lower end of the elastic element 15 abuts against the lower end of the adjusting bolt 16, so that the piston 4 drives the piston 4 to retract under the action of the elastic element 15, so that the piston 4 moves upward and resets, that is, when oil is passed into the piston hole 203 to make the piston 4 overcome the elastic force of the elastic element 15, the piston 4 extends out and moves toward the brake valve 11.

[0067] In some examples, such as Figure 1 and 2 As shown, the spring 6 presses the spherical washer 5 to elastically press against the inner wall of the expanded hole 2041, so that the clamping rod 3 contacts the hole wall on one side of the clamping hole 204 close to the cam follower structure 202, and a gap is formed between the hole wall on one side of the clamping hole 204 close to the piston 4 and the clamping rod 3; the clamping rod 3 is supported by the hole wall of the clamping hole 204 to limit the braking rocker arm 2 and prevent the braking rocker arm 2 from swinging when the brake is not turned on.

[0068] In some examples, the flared hole 2041 and the clamping hole 204 are eccentrically arranged. For example, the axis of the flared hole 2041 is closer to the cam follower structure 202 than the axis of the clamping hole 204, so that when the brake is not turned on, the inner wall of the clamping hole 204 can contact the outer wall of the clamping rod 3; of course, the flared hole 2041 and the clamping hole 204 can also be coaxially arranged.

[0069] In some examples, an end hole 205 is opened on the outer wall of the brake rocker arm 2 toward the rocker arm shaft 7, and a flared hole 2041 is opened at the bottom of the end hole 205. For example, the end hole 205, the flared hole 2041 and the clamping hole 204 are arranged in sequence from top to bottom; the design of the end hole 205 can make the abutment point between the spherical washer 5 and the inner circumferential wall of the flared hole 2041 closer to the rocker arm shaft 7, that is, the abutment point between the spherical washer 5 and the flared hole 2041 is moved downward, which can improve the stress state and cause the threaded connection between the clamping rod 3 and the rocker arm shaft 7 to loosen. More importantly, it is not easy to deform the clamping rod 3, thereby avoiding changes in the static position of the brake rocker arm 2.

[0070] In some examples, a spring cavity 503 is formed at one end of the spherical washer 5 away from the rocker shaft 7, and one end of the spring 6 close to the rocker shaft 7 presses against the bottom of the spring cavity 503, thereby improving the compactness of the structure.

[0071] In some examples, an engine includes the engine elastically fixed rocker arm brake described above.

[0072] When the engine is in positive power state, the solenoid valve is closed, the piston hole 203 does not flow with oil, the brake is closed, the piston 4 in the piston hole 203 retracts, the brake cam 1 does not contact the cam follower structure 202, the piston 4 does not contact the valve pin 12, and the spring 6 presses the spherical washer 5 toward the rocker shaft 7, so that the spherical washer 5 presses the expanded hole 2041 of the clamping hole 204, thereby elastically fixing the brake rocker arm 2 on the rocker shaft 7 to prevent the brake rocker arm 2 from shaking when the brake is closed; the engine camshaft 14 drives the brake cam 1 and the positive power cam 8 to rotate, and the brake rocker arm 2 will not transmit the lift of the brake cam 1 to the brake valve 11; the positive power cam 8 drives the valve bridge 10 to move through the positive power rocker arm 9, so as to open the non-brake valve 13 and the brake valve 11 at the same time, and complete the normal valve positive power lift;

[0073] When the engine brake is turned on, the solenoid valve opens, and the oil in the piston hole 203 drives the piston 4 to extend. The extended piston 4 will first contact the valve pin 12 of the brake valve 11, and the brake rocker arm 2 compresses the spring 6 through the spherical washer 5. While the spring 6 is further compressed, the brake rocker arm 2 rotates toward the cam follower structure 202, and the cam follower structure 202 is able to contact the brake cam 1. At this time, a gap is formed between the clamping hole 204 and the clamping rod 3 on both sides of the rotation direction around the rocker shaft 7; when the positive power rocker arm 9 of the engine does not drive the valve bridge 10 to move, the camshaft 14 drives the brake cam 1 and the positive power cam 8 to rotate. When the brake cam 1 rotates to the brake lift boss and contacts the cam follower structure 202 of the brake rocker arm 2, the brake cam 1 drives the brake rocker arm 2 to rotate, so that the piston 4 on the brake rocker arm 2 pushes the valve pin 12 downward, and the valve pin 12 and the brake valve 11 move downward synchronously relative to the valve bridge 10, so that the brake valve 11 opens and completes the brake lift.

[0074] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A rocker arm brake with elastic fixing of an engine, characterized in that: include: A brake rocker arm (2) having an axial hole (201) sleeved on a rocker shaft (7) of an engine and rotatably connected to the rocker shaft (7); a cam follower structure (202) is provided on one side of the rocker shaft (7) of the brake rocker arm (2); a piston hole (203) is provided on the other side of the rocker shaft (7); a clamping hole (204) communicating with the axial hole (201) is provided on the outer wall of the brake rocker arm (2); an end of the clamping hole (204) away from the axial hole (201) has an expanded hole (2041) which gradually becomes smaller along the direction from the clamping hole (204) to the axial hole (201); the expanded hole (2041) is a spherical hole or a conical hole; A brake cam (1) used to cooperate with the cam follower structure (202), wherein the brake cam (1) is mounted on a camshaft (14) of the engine and is spaced apart from the cam follower structure (202); A piston (4) is arranged at a distance from a brake valve (11) of the engine, the piston (4) being telescopically mounted in a piston hole (203) and being used to abut against the brake valve (11) so that the brake rocker arm (2) rotates until the cam follower structure (202) contacts the brake cam (1), and the rocker arm shaft (7) is located between the cam follower structure (202) and the piston (4); A clamping rod (3) passes through the clamping hole (204) and is fixedly connected to the rocker arm shaft (7); A spherical washer (5), wherein the spherical end (501) of the spherical washer (5) matches the expanded hole (2041), and the circle hole (502) of the spherical washer (5) is sleeved outside the pressing rod (3); and a spring (6), wherein one end of the spring (6) abuts against the clamping rod (3) and the other end abuts against the spherical washer (5), so that the spherical end (501) of the spherical washer (5) is pressed into the expanded hole (2041), and a gap is left between the inner wall of the circle hole (502) and the inner wall of the clamping hole (204) and the side wall of the clamping rod (3) close to the piston (4).

2. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: A gap is left between a side wall of the clamping rod (3) close to the brake cam (1) and an inner wall of the clamping hole (204); Alternatively, a side wall of the clamping rod (3) close to the brake cam (1) contacts the inner wall of the clamping hole (204).

3. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: The clamping rod (3) has a protrusion (301), and the spring (6) is sleeved outside the clamping rod (3). One end of the spring (6) abuts against the protrusion (301), and the other end abuts against an end of the spherical washer (5) away from the spherical end (501).

4. The engine elastically fixed rocker arm brake according to claim 3, characterized in that: One end of the spring (6) is fixedly connected to the protruding portion (301), and the other end is fixedly connected to an end of the spherical washer (5) away from the spherical end (501).

5. The engine elastically fixed rocker arm brake according to claim 3, characterized in that: The protruding portion (301) is integrally formed with or fixedly connected to the pressing rod (3).

6. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: The clamping rod (3) is threadedly connected to the rocker arm shaft (7).

7. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: An elastic element (15) is provided on the brake rocker arm (2), and the elastic element (15) is used to move the piston (4) in a direction away from the brake valve (11); When the oil in the piston hole (203) causes the piston (4) to overcome the elastic force of the elastic element (15), the piston (4) extends and moves toward the brake valve (11).

8. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: The spring (6) presses the spherical washer (5) to elastically press against the inner peripheral wall of the expanded hole (2041), so that the clamping rod (3) contacts the hole wall on one side of the clamping hole (204) close to the cam follower structure (202), and a gap is formed between the hole wall on one side of the clamping hole (204) close to the piston (4) and the clamping rod (3).

9. The engine elastically fixed rocker arm brake according to claim 8, characterized in that: The flaring hole (2041) and the pressing hole (204) are eccentrically arranged.

10. The engine elastically fixed rocker arm brake according to claim 9, characterized in that: The axis of the flaring hole (2041) is closer to the cam follower structure (202) than the axis of the clamping hole (204).

11. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: An outer wall of the brake rocker arm (2) is provided with an end hole (205) facing the rocker arm shaft (7), and the expanded hole (2041) is provided at the bottom of the end hole (205).

12. The engine elastically fixed rocker arm brake according to claim 1, characterized in that: A spring cavity (503) is formed at one end of the spherical gasket (5) away from the rocker shaft (7), and one end of the spring (6) close to the rocker shaft (7) abuts against the bottom of the spring cavity (503).

13. An engine, characterized in that: It comprises a rocker arm brake with elastic fixation of the engine as described in any one of claims 1-12.

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