Adjustable positioning mechanism of engine brake rocker arm

Abstract

An adjustable positioning mechanism of an engine brake rocker arm comprises an elastic body and an elastic body seat. One end of the elastic body abuts against a rocker arm shaft of an engine through the elastic body seat, and the other end of the elastic body abuts against a rocker arm of the engine. The elastic deformation of the elastic body exerts acting force between the rocker arm and the rocker arm shaft, the rocker arm comprises a positioning hole, the elastic body and the elastic body seat are arranged in the positioning hole, the elastic body is arranged on the elastic body seat in the length direction of the elastic body seat, and the elastic body is arranged on the rocker arm seat in the length direction of the elastic body seat. And the elastic body seat can move in the positioning hole to change the position of the elastic body seat in the positioning hole, so that the length of the elastic body is changed to change the acting force between the rocker arm and the rocker arm shaft.

Description

TECHNICAL FIELD

[0001] The present embodiment relates to the field of machinery, and in particular to engines, and more particularly to an adjustable positioning mechanism for an engine brake rocker arm. BACKGROUND

[0002] US Patent No. 5626116 (1997) discloses a dedicated brake rocker arm by Cummins Engine Company. The dedicated brake rocker arm houses a hydraulic brake actuation mechanism, including a hydraulic piston. When engine braking is not required, the hydraulic piston in the dedicated brake rocker arm is in a retracted position, the dedicated brake rocker arm is separated from the valve, the movement of the dedicated brake cam is skipped (lost), and no brake valve movement is generated; when engine braking is required, the hydraulic piston in the dedicated rocker arm is in an extended position, the dedicated rocker arm transmits the movement of the dedicated brake cam to one of the two exhaust valves, generating engine brake valve movement.

[0003] US Patent No. 5,975,251 (1999) discloses a locking device for the dedicated brake rocker arm, which is locked on the rocker shaft during non-braking (ignition) and both ends are suspended, neither contacting the brake cam nor the brake valve. This locking device is used in the dedicated brake rocker arm of Cummins ISX engine, but it is found to be unreliable, and the rocker arm will swing and impact on the rocker shaft, causing engine damage. Obviously, during braking, the rocker arm can rotate freely on the rocker shaft and cannot be positioned, and it is likely to collide with the cam or valve, resulting in poor reliability.

[0004] The existing dedicated brake rocker arm is biased on the cam by a spring and is driven by the cam. For example, the rocker arm in Chinese Utility Model Patent No. CN201666172U is biased on the brake cam by a spring installed between the bracket and the pressing plate, so a special spring bracket needs to be added to the engine, occupying a large space, and installation is not convenient, and the cost is high. Since the rocker arm is always driven by the brake cam (both during ignition and during braking), the rocker arm generates unnecessary movement during engine ignition operation, greatly increasing the use frequency and wear and impact of the rocker arm. In addition, the spring must have a large pre-tightening force to maintain the engine brake rocker arm in contact with the cam (not fly off) during rotation of the cam shaft. SUMMARY

[0005] The purpose of the embodiment is to provide an adjustable positioning mechanism of an engine brake rocker arm, which solves the technical problems of poor reliability of the locking mechanism of the engine brake rocker arm, the need for a large pre-tightening force spring and a special bracket for the rocker arm, large space occupation, inconvenient installation, high cost, useless movement of the rocker arm during engine ignition operation, increased use frequency, wear and oil consumption.

[0006] The first aspect of the utility model provides an adjustable positioning mechanism of an engine brake rocker arm, which comprises an elastic body and an elastic body seat; one end of the elastic body is in abutment with a rocker arm shaft of an engine through the elastic body seat, and the other end of the elastic body is in abutment with a rocker arm of the engine; elastic deformation of the elastic body exerts a force between the rocker arm and the rocker arm shaft, wherein

[0007] The rocker arm comprises a positioning hole, the elastic body and the elastic body seat are arranged in the positioning hole, the elastic body is arranged in the elastic body seat in the length direction of the elastic body seat, and the elastic body seat can move in the positioning hole to change the position of the elastic body seat in the positioning hole, thereby changing the length of the elastic body to change the force between the rocker arm and the rocker arm shaft.

[0008] Optionally, the rocker arm comprises a positioning hole arranged in the radial direction of the rocker arm shaft.

[0009] Optionally, the elastic body is arranged in the elastic body seat in the length direction of the elastic body seat.

[0010] Optionally, at least a part of the outer surface of the elastic body seat cooperates with the positioning hole, so that the elastic body seat can move in the axial direction of the positioning hole in the positioning hole.

[0011] Optionally, the elastic body seat comprises a large-diameter section and a small-diameter section, the elastic body is arranged outside the small-diameter section in the length direction of the small-diameter section, and the outer diameter of the large-diameter section cooperates with the hole diameter of the positioning hole, so that the elastic body seat can move along the positioning hole, thereby changing the length of the elastic body outside the small-diameter section in the positioning hole.

[0012] Optionally, a stepped surface is formed between the large-diameter section and the small-diameter section, the elastic body is arranged outside the small-diameter section, and one end of the elastic body is arranged on the stepped surface.

[0013] Optionally, the large-diameter section is arranged adjacent to the rocker arm shaft.

[0014] Optionally, the adjustable positioning mechanism further comprises a clamping mechanism arranged in the positioning hole of the rocker arm, and the other end of the elastic body abuts against the rocker arm through the clamping mechanism.

[0015] Optionally, the clamping mechanism comprises a first washer and a first clamping ring, the first clamping ring is connected with the positioning hole, and the first washer is arranged on the first clamping ring, and the other end of the elastic body is arranged on the first washer.

[0016] Optionally, the first washer is sleeved outside the small-diameter section of the elastic body seat.

[0017] Optionally, the elastic body seat further comprises a limiting mechanism, part of the elastic body seat in the length direction protrudes out of the positioning hole, the limiting mechanism is arranged on the part of the elastic body seat protruding out of the positioning hole, and the elastic body seat can move in the positioning hole by adjusting the distance between the limiting mechanism and the rocker arm.

[0018] Optionally, the small-diameter section of the elastic body seat protrudes out of the positioning hole in part of the length direction.

[0019] Optionally, the limiting mechanism comprises a second clamping ring, the adjustable positioning mechanism further comprises a second washer, the second clamping ring is connected with the small-diameter section of the elastic body seat protruding out of the positioning hole, the second washer is arranged above the outer opening of the positioning hole of the rocker arm and is sleeved on the part of the small-diameter section of the elastic body seat protruding out of the positioning hole, and the elastic body seat can move in the positioning hole by adjusting the distance between the second clamping ring and the second washer.

[0020] Optionally, the outer diameter of the second clamping ring is larger than the hole diameter of the inner hole of the second washer, so as to prevent the elastic body seat from falling off from the positioning hole.

[0021] Optionally, the rocker arm is rotatably arranged on the rocker shaft of the engine, the adjustable positioning mechanism applies a force between the rocker arm and the rocker shaft to increase the movement resistance of the rocker arm on the rocker shaft and keep the rocker arm in two non-collision positions on the rocker shaft, in the two non-collision positions, one end of the rocker arm avoids being driven by the cam of the engine, and the other end of the rocker arm avoids acting on the valve of the engine.

[0022] In the second aspect of the utility model, an adjustable positioning mechanism of engine brake rocker arm is provided, the adjustable positioning mechanism comprises an elastic body and an elastic body seat; one end of the elastic body abuts against the rocker arm of the engine through the elastic body seat, and the other end of the elastic body abuts against the rocker arm shaft of the engine; and the elastic deformation of the elastic body applies a force between the rocker arm and the rocker shaft, wherein

[0023] The rocker arm comprises a positioning hole, the elastic body and the elastic body seat are arranged in the positioning hole, the elastic body is arranged in the elastic body seat in the length direction of the elastic body seat, the elastic body seat can move in the positioning hole to change the position of the elastic body seat in the positioning hole, thereby changing the length of the elastic body to change the force between the rocker arm and the rocker shaft.

[0024] Optionally, the elastic body is arranged in or sleeved on the elastic body seat in the length direction of the elastic body seat.

[0025] Optionally, at least part of the outer surface of the elastic body seat is matched with the positioning hole, so that the elastic body seat can move in the axial direction of the positioning hole.

[0026] Optionally, at least part of the outer surface of the elastic body seat is threadedly connected with the positioning hole.

[0027] Optionally, the elastic body seat is provided with an inner hole, the elastic body is arranged in the inner hole in the length direction of the elastic body seat, the outer diameter of the elastic body seat is matched with the hole diameter of the positioning hole, so that the elastic body seat can move along the positioning hole, thereby changing the distance between the inner hole of the elastic body seat and the inner opening of the positioning hole, and the inner opening is arranged adjacent to the rocker shaft.

[0028] Optionally, one end of the elastic body is arranged at the hole bottom of the inner hole of the elastic body seat.

[0029] Optionally, the adjustable positioning mechanism further comprises a locking member, the elastic body seat is arranged to protrude from the positioning hole in the length direction, the locking member is arranged at the part of the elastic body seat protruding from the positioning hole, and the elastic body seat is locked to the rocker arm.

[0030] Optionally, the adjustable positioning mechanism further comprises a clamping mechanism, the clamping mechanism is arranged in the positioning hole of the rocker arm, and the other end of the elastic body abuts against the rocker shaft through the clamping mechanism.

[0031] Optionally, the positioning hole is a stepped hole and comprises a stepped surface, the hole diameter of the positioning hole decreases in the direction close to the rocker shaft; the clamping mechanism comprises a large-diameter section and a small-diameter section, the stepped surface is formed between the large-diameter section and the small-diameter section; and the stepped surface of the clamping mechanism can be clamped to the stepped surface of the positioning hole to prevent the elastic body from falling off.

[0032] Optionally, the other end of the elastic body is arranged on the top surface of the large-diameter section, the bottom surface of the small-diameter section is arranged on the rocker shaft, and the clamping mechanism can slide in the positioning hole.

[0033] Optionally, the positioning hole of the rocker arm is arranged along the radial direction of the rocker shaft.

[0034] Optionally, the rocker arm is rotatably arranged on the rocker shaft of the engine, and the adjustable positioning mechanism applies a force between the rocker arm and the rocker shaft to increase the movement resistance of the rocker arm on the rocker shaft and keep the rocker arm in two non-collision positions on the rocker shaft, in which one end of the rocker arm avoids the driving of the cam of the engine and the other end of the rocker arm avoids the action with the valve of the engine.

[0035] Compared with the prior art, the embodiment has positive and obvious effects. The rocker arm is positioned in the two non-collision positions with the brake cam and the engine valve, avoids the driving of the brake cam, and has no movement in the non-braking (ignition) state of the engine, thereby reducing wear and tear and oil consumption, and enhancing reliability and durability. In addition, the adjustable positioning mechanism of the rocker arm of the embodiment does not occupy space (especially does not increase height), does not increase weight, has a compact structure, is easy to install, has good reliability, and has low cost. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic view of the adjustable positioning mechanism of the engine brake rocker arm of embodiment 1, in which the engine is in an ignition state, and the brake piston in the rocker arm is retracted.

[0037] Figure 2 is a schematic view of the adjustable positioning mechanism of the engine brake rocker arm of embodiment 2. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present application by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0039] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0041] Example 1:

[0042] like Figure 1 As shown, the engine brake rocker arm (hereinafter referred to as the rocker arm) 210 is rotatably mounted on the rocker arm shaft 205 (the engine exhaust rocker arm can be mounted side-by-side with the brake rocker arm on the same rocker arm shaft, but is not shown here). One end of the rocker arm 210 (here, the roller 235, or a pushrod mechanism) is equipped with a brake cam 230, and the other end of the rocker arm 210 is equipped with an engine valve 301 (hereinafter referred to as the valve). The valve stem of the valve 301 is equipped with a valve stem cap 405, and the valve bridge 400 presses on the valve stem cap 405. The exhaust rocker arm acts on the center of the valve bridge 400, driving the two exhaust valves. An engine braking mechanism 100 is installed inside the rocker arm 210 above the valve 301.

[0043] During normal engine ignition (non-engine braking) operation, the engine braking control mechanism (not shown) disconnects and discharges oil, the brake piston 160 retracts, and the rocker arm 210 tends to (automatically positioned by the cams 230 at both ends of the rocker arm 210 and the valve 301) as... Figure 1The two non-collision positions shown, that is, the end of the rocker arm 210 does not produce any action with the brake cam 230 (brake cam 231) and the other end does not produce any action with the valve 301 (valve cap 405), especially the gap 212 is formed between the rocker arm 210 and the base circle 229 of the brake cam 230 (the gap 212 is set by the adjusting screw 105 and the locking nut 115, and the size is not less than the lift of the brake cam, that is, not less than the height of the brake cam 231), so that the rocker arm 210 is not driven by the cam 230, the movement of the cam 230 is lost, and the valve movement of the engine brake is not produced. It is noted that the valve movement of the engine ignition (including the exhaust valve movement) is produced by the conventional valve driving mechanism (not shown) and is not affected by the engine brake.

[0044] In practical application, due to the bumps / shocks generated by the operation of the vehicle, the rocker arm 210 in the engine ignition state on the rocker arm shaft 205 is in the two non-collision positions (the gap 212 is formed between the rocker arm 210 and the base circle 229 of the brake cam 230) Figure 1 ), the two non-collision positions may be disturbed, causing the rocker arm 210 to collide with the cam 230 and / or the valve 301. In order to eliminate such disturbance, the adjustable positioning mechanism 60 of the engine brake rocker arm of the embodiment is born.

[0045] Referring to Figure 1 , the adjustable positioning mechanism includes an elastic body 62 and an elastic body seat 61; one end of the elastic body 62 is in abutment with the rocker arm shaft 205 of the engine through the elastic body seat 61, and the other end of the elastic body 62 is in abutment with the rocker arm 210 of the engine; the elastic deformation of the elastic body 62 exerts a force between the rocker arm 210 and the rocker arm shaft 205, wherein the rocker arm 210 includes a positioning hole 64, the elastic body 62 and the elastic body seat 61 are arranged in the positioning hole 64, the elastic body 62 is arranged in the elastic body seat 61 in the length direction of the elastic body seat 61, the elastic body seat 61 can move in the positioning hole 64 to change the position of the elastic body seat 61 in the positioning hole 64, and then change the length of the elastic body 62 (the elastic deformation amount changes) to change the force between the rocker arm 210 and the rocker arm shaft 205. The length direction of the elastic body seat 61 can be understood as the up-down direction in Figure 1 . In addition, abutment can be understood as forceful connection. Abutment can be direct contact and forceful action, or indirect contact and forceful action, etc., and contact can be fixed connection or non-fixed connection. For example, "one end of the elastic body 62 is in abutment with the rocker arm shaft 205 of the engine through the elastic body seat 61" can be understood as indirect contact and forceful action.

[0046] In an embodiment of the utility model, the elastic body 62 can be a spiral spring, and the elastic body seat 61 can be a spiral spring seat.

[0047] In an embodiment of the present application, at least a part of the outer surface of the elastic body seat 61 cooperates with the positioning hole 64, so that the elastic body seat 61 can move in the axial direction of the positioning hole 64. Figure 1 The axial direction of the positioning hole 64 is the up-down direction in the figure. The positioning hole 64 and the outer surface of the elastic body seat 61 cooperating with the positioning hole 64 can play a limiting role. For example, when the rocker arm 210 rotates on the rocker arm shaft 205, the elastic body seat 61 will not move. The outer surface of the elastic body seat 61 and the positioning hole 64 can be threaded, which can play a fixing role and a limiting role. The outer surface of the elastic body seat 61 can also be smooth, and the hole surface of the positioning hole 64 can also be smooth.

[0048] In an embodiment of the present application, the rocker arm 210 includes a positioning hole 64 arranged in the radial direction of the rocker arm shaft 205. Since the positioning hole 64 is a through hole, the through hole has two openings, one near the rocker arm shaft 205 and the other away from the rocker arm shaft 205. The outer opening of the positioning hole 64 is the opening on the side away from the rocker arm shaft 205, and the inner opening of the positioning hole 64 is the opening near the rocker arm shaft 205.

[0049] In an embodiment of the present application, the elastic body seat 61 includes a large-diameter section 611 and a small-diameter section 612. The elastic body 62 is sleeved on the outside of the small-diameter section 612 in the length direction of the small-diameter section 612. The outer diameter of the large-diameter section 611 cooperates with the hole diameter of the positioning hole 64, so that the elastic body seat 61 can move along the positioning hole 64 to change the length of the small-diameter section 612 in the positioning hole 64. The small-diameter section 612 can be a rod. The large-diameter section 611 and the positioning hole 64 play a limiting role. Since the elastic body 62 is sleeved on the outside of the small-diameter section 612, the length of the small-diameter section 612 in the positioning hole 64 is changed, and the elastic body 62 can be compressed, stretched, or restored to a state where the elastic deformation amount is zero to change the elastic deformation amount of the elastic body 62.

[0050] In an embodiment of the present application, a step surface 613 is formed between the large-diameter section 611 and the small-diameter section 612, and one end of the elastic body 62 is arranged on the step surface 613. Thus, one end of the elastic body 62 abuts against the step surface 613.

[0051] In an embodiment of the present application, the large-diameter section 611 is arranged close to the rocker arm shaft 205, so that the large-diameter section 611 abuts against the rocker arm shaft 205. In this way, the force of the elastic body 62 can act on the rocker arm shaft 205.

[0052] In an embodiment of the utility model, adjustable positioning mechanism 60 still includes clamping mechanism, clamping mechanism sets up in the positioning hole 64 of rocker arm 210, the other end of elastic body 62 is abutted with rocker arm 210 through clamping mechanism. In this way, the force of elastic body 62 can act on rocker arm 210. Specifically, clamping mechanism includes first washer 66 and first snap ring 67, first snap ring 67 is connected (may be fixedly connected) with positioning hole 64, first washer 66 is set up in first snap ring 67, the other end of elastic body 62 is set up in first washer 66. First washer 66 is set up in the outside of small diameter section 611 of elastic body seat 61.

[0053] In an embodiment of the utility model, elastic body seat 61 still includes limiting mechanism 69, the partial area of elastic body seat 61 in length direction is protruding positioning hole 64, limiting mechanism 69 is set up in the partial area of elastic body seat 61 protruding positioning hole 64, adjust the distance of limiting mechanism 69 and rocker arm 210, and elastic body seat 61 can move in positioning hole 64. Because limiting mechanism 69 is located above rocker arm 210, also can be understood as, adjust the distance of limiting mechanism 69 and the upper surface of rocker arm 210. Limiting mechanism can also ensure that the internal components of rocker arm cannot fall off before being assembled to rocker arm shaft. Limiting mechanism 69 can be snap ring.

[0054] Specifically, the partial area of small diameter section 612 of elastic body seat 61 in length direction is protruding positioning hole 64.

[0055] In an embodiment of the utility model, limiting mechanism 69 can be second snap ring, and adjustable positioning mechanism 60 still includes second washer 68, second washer 68 is set up in the outside opening of the positioning hole 64 of rocker arm 210 and is set up in the partial area of elastic body seat 61 protruding positioning hole 64, adjust the distance of limiting mechanism 69 (second snap ring) and second washer 68, and elastic body seat 61 can move in positioning hole 64.

[0056] In an embodiment of the utility model, the outer diameter of limiting mechanism 69 (second snap ring) is larger than the hole diameter of the inner hole of second washer 68, to prevent elastic body seat 61 from falling off from positioning hole 64. The inner hole of second washer 68 is set up in elastic body seat 61.

[0057] Example of embodiment 1: adjustable positioning mechanism 60 includes elastic body 62, one end of elastic body 62 (the upper end in the drawing, acts on rocker arm 210 through first washer 66 and first snap ring 67), the other end of elastic body 62 (the lower end in the drawing) is abutted with elastic body seat 61. Figure 1 Figure 1 ​The lower end of the elastic body 62 abuts against the rocker shaft 205 through the elastic body seat 61 (the bottom surface 65) which is located in the positioning hole 64 on the rocker 210 and is located radially (through the shaft center) of the rocker shaft 205. The rod 63 of the elastic body seat 61 is provided with a second washer 68 and a limiting mechanism 69 (which can be a second snap ring), and the function of the limiting mechanism 69 is to ensure that the elastic body seat 61 and the elastic body 62 cannot fall out of the positioning hole 64 on the rocker 210 before the rocker 210 is assembled on the rocker shaft 205. In fact, the rod 63 of the elastic body seat 61 can be used to adjust the force of the elastic body 62 acting on the rocker shaft 205. Before the rocker 210 is installed on the rocker shaft 205 (the rocker shaft is not installed in the rocker shaft installation hole, and the rocker shaft 205 also does not have an acting force). The elastic body 62 pushes the elastic body seat 61 downward into the rocker shaft installation hole, the limiting mechanism 69 is seated on the second washer 68, the gap between the second washer 68 and the limiting mechanism 69 is eliminated, the elastic body 62 is elongated, and the elastic body force is reduced. At this time, if the elastic body seat 61 is pulled upward through the small diameter section 612 of the elastic body seat 61, for example, a washer can be inserted between the second washer 68 and the limiting mechanism 69 to change the size of the elastic body force. When the thickness of the washer is large enough, the force between the elastic body 62 and the rocker shaft 205 can be zero. At this time, the rocker shaft 205 can be freely (without any resistance) installed or separated from the rocker shaft installation hole of the rocker 210.

[0058] Embodiment 2:

[0059] Compared with embodiment 1, the adjustable positioning mechanism in this embodiment plays the same role, but the structure is slightly different. This embodiment only describes the different places from the mechanism of embodiment 1, and the same places will not be described again, especially the same structure and role of the elastic body seat will not be described again.

[0060] Reference Figure 2 The adjustable positioning mechanism 70 includes an elastic body 72 and an elastic body seat 76; one end of the elastic body 72 abuts against the rocker 210 of the engine through the elastic body seat 76, and the other end of the elastic body 72 abuts against the rocker shaft 205 of the engine; the elastic deformation of the elastic body 72 exerts a force between the rocker 210 and the rocker shaft 205, wherein the rocker 210 includes a positioning hole 78, the elastic body 72 and the elastic body seat 76 are arranged in the positioning hole 78, the elastic body 72 is arranged in the elastic body seat 76 in the length direction of the elastic body seat 76, the elastic body seat 76 can move in the positioning hole 78 to change the position of the elastic body seat 76 in the positioning hole 78, and then change the length of the elastic body 72 (the elastic deformation amount changes) to change the force between the rocker 210 and the rocker shaft 205.

[0061] In an embodiment of the utility model, the elastic body seat 76 can be a bolt, and the elastic body can be a spiral spring.

[0062] In an embodiment of the present application, the elastic body seat 76 is provided with an inner hole 77, the elastic body 72 is arranged in the inner hole 77 in the length direction of the elastic body seat 76, the outer diameter of the elastic body seat 76 is matched with the hole diameter of the positioning hole 78, so that the elastic body seat 76 can move along the positioning hole 78, thereby changing the distance between the inner hole 77 and the inner opening of the positioning hole 78, and the inner opening is arranged adjacent to the rocker shaft 205. Since the elastic body 62 is arranged in the inner hole 77, the distance between the inner hole 77 and the inner opening of the positioning hole 78 is changed, the elastic body 62 can be compressed, stretched or restored to a state with zero elastic deformation, so as to change the elastic deformation of the elastic body 62. The positioning hole 78 and the outer surface of the elastic body seat 76 matched with the positioning hole 78 can play a limiting role, and the outer surface of the elastic body seat 76 and the positioning hole 78 can be provided with threads, which can play a fixing role or a limiting role.

[0063] In an embodiment of the present application, one end of the elastic body 72 is arranged at the hole bottom of the inner hole 77. The force of the elastic body 62 can act on the rocker arm 210.

[0064] In an embodiment of the present application, the adjustable positioning mechanism 70 further comprises a locking member 79, a part of the elastic body seat 76 in the length direction extends out of the positioning hole 78, the locking member 79 is arranged at the part of the elastic body seat 76 extending out of the positioning hole 78, and the elastic body seat 76 is locked to the rocker arm 210. The locking member 79 can be a nut. Through such a design, the elastic body seat 76 is not easy to loosen.

[0065] In an embodiment of the present application, the adjustable positioning mechanism 70 further comprises a clamping mechanism 71, the clamping mechanism 71 is arranged in the positioning hole 78 of the rocker arm 210, and the other end of the elastic body 72 abuts against the rocker shaft 75 through the clamping mechanism 71. The clamping mechanism can play a limiting role, for example, when the rocker arm 210 rotates on the rocker shaft 205, the elastic body 72 will not produce any movement, and in addition, the force of the elastic body 62 can act on the rocker shaft 205.

[0066] Specifically, the positioning hole 78 is a stepped hole and comprises a stepped surface, in the direction close to the rocker shaft 205, the hole diameter of the positioning hole 78 becomes smaller; the clamping mechanism 71 comprises a large-diameter section and a small-diameter section, and the stepped surface is formed between the large-diameter section and the small-diameter section; the stepped surface of the clamping mechanism is clamped to the stepped surface of the positioning hole 78, so as to prevent the elastic body 72 from falling off. The other end of the elastic body 72 is arranged on the top surface of the large-diameter section, the bottom surface of the small-diameter section is arranged on the rocker shaft 205, and the clamping mechanism 71 can slide in the positioning hole 78.

[0067] Example of embodiment 2: the adjustable positioning mechanism 70 of embodiment 2 comprises an elastic body (which can be a coil spring) 72, one end of the elastic body 72 is arranged on the top surface of the large-diameter section of the clamping mechanism 71, the other end of the elastic body 72 is arranged on the bottom surface of the small-diameter section of the clamping mechanism 71, and the clamping mechanism 71 is arranged in the positioning hole 78 of the rocker arm 210.Figure 2 The upper end of the spring 72 (the end that is in the hole 77 of the elastomeric mount 76) is seated in the hole 78 of the rocker arm 210 and is locked in place by the lock 79 (which can be a nut). Thus, the spring 72 acts on the rocker arm 210 through the elastomeric mount 76. The lower end of the spring 62 (the end that is in the hole 77 of the elastomeric mount 76) is seated against the rocker shaft 205 by the detent mechanism 71 (the bottom surface 75) in the small hole 73 of the hole 78 of the rocker arm 210, which is in the radial direction (through the center) of the rocker shaft 205. It is clear that the elastomeric mount 76 can be used to adjust the force of the spring 72 on the rocker shaft 205. When the elastomeric mount 76 is moved up enough, the force between the spring 72 and the rocker shaft 205 can be zero. At this point, the rocker shaft 205 can be freely (without any resistance) installed or removed from the rocker shaft mounting hole of the rocker arm 210. Figure 2

[0068] The above examples are intended to be illustrative and not restrictive. Indeed, those skilled in the art can readily appreciate variations and modifications to the embodiments disclosed herein, without departing from the scope and spirit of the application. For example, a function described or depicted in one embodiment can be incorporated in another embodiment, thereby providing a new embodiment. The rocker arm in the embodiments can be other types of rocker arms, such as an EGR rocker arm or a rocker arm for variable valve actuation of an engine. In addition, the engine brake mechanism in the rocker arm can be of different types, and in addition to the brake mechanism, other mechanisms such as EGR can be incorporated. Also, the adjustable detent mechanism can be located and mounted differently. In addition, the spring can be of different forms and mounted differently. Accordingly, the embodiments are to be considered as illustrative and not restrictive, and the application is not to be limited to the details given herein, but can be modified within the scope and equivalents of the appended claims.​

Claims

1. An adjustable positioning mechanism for an engine brake rocker arm, characterized in that: The adjustable positioning mechanism includes an elastic body and an elastic body seat; one end of the elastic body abuts against the rocker arm shaft of the engine via the elastic body seat, and the other end of the elastic body abuts against the rocker arm of the engine; the elastic deformation of the elastic body applies a force between the rocker arm and the rocker arm shaft, wherein... The rocker arm includes a positioning hole, and the elastic body and the elastic body seat are disposed in the positioning hole. The elastic body is disposed in the elastic body seat along the length direction of the elastic body seat. The elastic body seat can move within the positioning hole to change the position of the elastic body seat within the positioning hole, thereby changing the length of the elastic body to change the force between the rocker arm and the rocker arm shaft.

2. The adjustable positioning mechanism for the engine brake rocker arm according to claim 1, characterized in that, The rocker arm includes a positioning hole arranged radially along the rocker arm axis.

3. The adjustable positioning mechanism for the engine brake rocker arm according to claim 1, characterized in that, The elastomer is inserted through or fitted onto the elastomer seat along its length.

4. The adjustable positioning mechanism for the engine brake rocker arm according to claim 1, characterized in that, At least a portion of the outer surface of the elastomer seat mates with the positioning hole, so that the elastomer seat can move within the positioning hole along the axial direction of the positioning hole.

5. The adjustable positioning mechanism for the engine brake rocker arm according to any one of claims 1 to 4, characterized in that, The elastomer seat includes a large-diameter section and a small-diameter section. The elastomer is sleeved on the outside of the small-diameter section along its length. The outer diameter of the large-diameter section matches the diameter of the positioning hole, so that the elastomer seat can move along the positioning hole, thereby changing the length of the elastomer on the outside of the small-diameter section within the positioning hole.

6. The adjustable positioning mechanism for the engine brake rocker arm according to claim 5, characterized in that, A stepped surface is formed between the large-diameter section and the small-diameter section, and the elastic body is sleeved on the outside of the small-diameter section with one end of the elastic body disposed on the stepped surface.

7. The adjustable positioning mechanism for the engine brake rocker arm according to claim 5, characterized in that, The large-diameter section is positioned adjacent to the rocker arm shaft.

8. The adjustable positioning mechanism for the engine brake rocker arm according to claim 1, characterized in that, The adjustable positioning mechanism further includes a locking mechanism, which is disposed in the positioning hole of the rocker arm, and the other end of the elastic body abuts against the rocker arm through the locking mechanism.

9. The adjustable positioning mechanism for the engine brake rocker arm according to claim 8, characterized in that, The locking mechanism includes a first washer and a first retaining ring. The first retaining ring is connected to the positioning hole. The first washer is disposed on the first retaining ring. The other end of the elastomer is disposed on the first washer.

10. The adjustable positioning mechanism for the engine brake rocker arm according to claim 9, characterized in that, The first washer is fitted onto the outer side of the small-diameter section of the elastomer seat.

11. The adjustable positioning mechanism for the engine brake rocker arm according to claim 1, characterized in that, The elastomer seat also includes a limiting mechanism. A portion of the elastomer seat extends out of the positioning hole in the length direction. The limiting mechanism is disposed in the portion of the elastomer seat that extends out of the positioning hole. By adjusting the distance between the limiting mechanism and the rocker arm, the elastomer seat can move within the positioning hole.

12. The adjustable positioning mechanism for the engine brake rocker arm according to claim 11, characterized in that, A portion of the small-diameter section of the elastomer seat extends beyond the positioning hole along its length.

13. The adjustable positioning mechanism for the engine brake rocker arm according to claim 11, characterized in that, The limiting mechanism includes a second retaining ring, and the adjustable positioning mechanism also includes a second washer. The second retaining ring is connected to the small-diameter section of the elastomer seat that extends out of the positioning hole. The second washer is disposed above the outer opening of the positioning hole of the rocker arm and sleeved on the portion of the small-diameter section of the elastomer seat that extends out of the positioning hole. By adjusting the distance between the second retaining ring and the second washer, the elastomer seat can move within the positioning hole.

14. The adjustable positioning mechanism for the engine brake rocker arm according to claim 13, characterized in that, The outer diameter of the second retaining ring is larger than the inner diameter of the second washer to prevent the elastomer seat from falling out of the positioning hole.

15. The adjustable positioning mechanism for the engine brake rocker arm according to claim 1, characterized in that, The rocker arm is rotatably mounted on the rocker arm shaft of the engine. The adjustable positioning mechanism applies a force between the rocker arm and the rocker arm shaft to increase the movement resistance of the rocker arm on the rocker arm shaft and keep the rocker arm in a non-collision position on the rocker arm shaft. In the non-collision position, one end of the rocker arm avoids the drive of the engine cam and the other end of the rocker arm avoids the action of the engine valve.

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