Device for conveniently replacing hydraulic tappet of engine

Abstract

The utility model discloses a device for conveniently replacing a hydraulic tappet of an engine, relates to the technical field of dismounting devices, and aims to solve the technical problem that the dismounting efficiency of the hydraulic tappet is low. The device comprises a fixing piece and a jacking mechanism. The fixing piece is used for being connected with an engine cylinder cover. The jacking mechanism comprises a body and a jacking part, the body is connected with the fixing part, an adjusting hole is formed in the body, part of the jacking part penetrates through the adjusting hole, and one end of the jacking part extends out of the adjusting hole and can abut against the valve spring base; the length of the part, located between the body and the valve spring base, of the jacking piece is adjustable so that the gap between the valve spring base and the cam shaft can be adjusted.

Description

Technical Field

[0001] This utility model relates to the field of disassembly device technology, specifically to a device for conveniently replacing engine hydraulic tappets. Background Technology

[0002] Engine hydraulic tappets are a component of the engine's valve train, typically located between the camshaft and the valves. Their main function is to convert the rotational motion of the camshaft into linear motion and transmit this motion to the valves, thereby enabling the valves to open and close, ensuring the smooth operation of the engine's intake and exhaust processes.

[0003] However, during engine manufacturing, hydraulic tappets may need to be replaced due to issues such as dimensional inaccuracies or failure to pass hydraulic system sealing tests. When the camshaft rotates, with the camshaft's cam cam (i.e., the tip) in the downward position, the camshaft compresses the valve spring to its minimum position via the hydraulic tappet. As the camshaft continues to rotate, the cam cam cam cam gradually moves away from the hydraulic tappet, which, under the restoring force of the valve spring, remains in contact with the camshaft, ensuring continuous valve movement. Therefore, replacing hydraulic tappets requires disassembling the engine drivetrain, front cover, timing chain, camshaft, and other components, resulting in low efficiency and high cost.

[0004] In related technology, CN201559161U discloses a hydraulic tappet assembly and disassembly tool for an engine. This tool includes a pull rod and a sleeve, with the sleeve fitted over the outside of the pull rod, allowing for relative sliding. Two oblique support rods are symmetrically arranged on both sides of the sleeve, one end of which is hinged to the sleeve, and the other end to the drive rib. One end of the drive rib is hinged to the bottom of the pull rod, while the other end is a free end with an anti-slip probe fixed thereon, facing outwards. Thus, the hydraulic tappet assembly and disassembly tool, through the cooperation of the pull rod and sleeve, causes the drive rib hinged to the pull rod to rotate, and the anti-slip probe at its free end moves outwards. The anti-slip probe effectively presses against the inner wall of the hydraulic tappet, greatly improving the efficiency of tappet removal. This tool is compact, lightweight, and easy to carry. However, when using this tool to replace the hydraulic tappet, the camshaft still needs to be disassembled, resulting in relatively low efficiency in replacing the hydraulic tappet. Utility Model Content

[0005] This invention provides a device for conveniently replacing engine hydraulic tappets, thereby solving the technical problem of low efficiency in the disassembly and assembly of hydraulic tappets.

[0006] This application provides a device for conveniently replacing engine hydraulic tappets, including a fixing member and a pressing mechanism. The fixing member is used to connect to the engine cylinder head. The pressing mechanism includes a body and a pressing member. The body is connected to the fixing member. The body is provided with an adjustment hole. A portion of the pressing member passes through the adjustment hole. One end of the pressing member extends out of the adjustment hole and can abut against the valve spring base. The length of the pressing member between the body and the valve spring base is adjustable to adjust the clearance between the valve spring base and the camshaft.

[0007] Based on the aforementioned technical means, the connection between the body and the fixed component ensures the stability of force transmission. Furthermore, a portion of the pressing component passes through the adjustment hole, with one end extending out of the hole and abutting against the valve spring base. The length of the pressing component between the body and the valve spring base is adjustable to adjust the clearance between the valve spring base and the camshaft. Thus, by pressing the valve spring base with the pressing component, the valve spring base is compressed. When the cam's protruding portion (i.e., the tip) is in the upward position, the clearance between the valve spring base and the camshaft is larger. This clearance allows the hydraulic tappet to disengage from the valve and be removed. This eliminates the need to disassemble the camshaft without removing the hydraulic tappet, thereby improving the efficiency of hydraulic tappet assembly and disassembly.

[0008] In one possible implementation, the top pressure component includes: a force-adjusting rod and a push rod, wherein a first internal thread is provided in the adjusting hole, and a first external thread that mates with the first internal thread is provided on the outer periphery of the force-adjusting rod; one end of the push rod is in contact with the force-adjusting rod, and the other end of the force-adjusting rod can abut against the valve spring base.

[0009] According to the above-mentioned technical means, since the outer circumference of the force-adding rod is provided with a first external thread and the adjusting hole is provided with a first internal thread, the first internal thread and the first external thread form a helical transmission pair. In this embodiment, by utilizing the mechanical gain characteristics of the thread, the rotational torque applied by the operator can be converted into the axial thrust of the push rod. This allows the pusher to press against the valve spring base, ensuring the valve spring base is in a compressed state, facilitating the removal of the hydraulic tappet. Furthermore, according to the principle of thread transmission, when the helix angle of the thread is less than the friction angle, the engagement between the first internal thread and the first external thread has a self-locking function. Therefore, the operator does not need to continuously apply force to keep the pusher in a pressing state.

[0010] In one possible implementation, the end face of the force-adding rod is provided with a receiving hole, and a portion of the push rod is disposed within the receiving hole.

[0011] According to the above-mentioned technical means, by placing part of the push rod inside the receiving hole, the push rod can be prevented from tilting when under force, ensuring that the axial force is transmitted vertically to the valve spring base along the axis of the valve spring. Compared with the planar contact structure without the receiving hole, the force transmission efficiency is improved, and the valve spring wear problem caused by uneven load is reduced.

[0012] In one possible implementation, the push rod is interference-fitted with the receiving hole.

[0013] Based on the above technical means, the interference fit generates a radial clamping force between the ejector pin and the receiving hole, eliminating the slight wobble that occurs with a clearance fit. This effectively avoids the problem of force transmission lag caused by the clearance during the pressing process.

[0014] In one possible implementation, the main body is rotatably connected to the fixing member, and the central axis of the push rod is arranged parallel to the plane in which the main body rotates.

[0015] It is understandable that the installation angle of valve springs may differ for different engine models. In this embodiment, the main body is rotatably connected to the fixed part, and the push rod automatically adapts to the angle of the valve spring by rotating the main body, without the need to change tools or adjust the installation method, thus improving the adaptability of the device.

[0016] In one possible implementation, the fastener is provided with a first mounting hole and a first oblong hole, the first oblong hole being arranged around the circumference of the first mounting hole; the body is provided with a first connecting hole and a second connecting hole; the device further includes: a first fastener and a second fastener, the first fastener passing through the first mounting hole and the first connecting hole to connect the fastener to the body; the second fastener passing through the first oblong hole and the second connecting hole to connect the fastener to the body.

[0017] According to the above-mentioned technical means, when it is necessary to adjust the angle of the body, the first and second fasteners (e.g., bolts) can be loosened. In this way, the first mounting hole and the first fastener form a rotation fulcrum, allowing the body to rotate around the axis of the first mounting hole. The first oblong holes, distributed circumferentially, provide an arc-shaped movement trajectory for the second fastener. This facilitates the adjustment of the body's angle. Once the desired angle is achieved, both the first and second fasteners can be tightened, providing two-point fixed support. This prevents further rotation of the body, which could cause the pushrod and valve spring to become misaligned.

[0018] In one possible implementation, the axial direction of the first connecting hole is consistent with the axial direction of the second connecting hole, and both are perpendicular to the axial direction of the adjusting hole.

[0019] Based on the above technical means, it can be ensured that the central axis of the push rod is set parallel to the plane in which the body rotates, thus enabling the rapid disassembly of hydraulic tappets for different engine models.

[0020] In one possible implementation, the adjustment hole is located between the first connection hole and the second connection hole.

[0021] According to the above-mentioned technical means, the adjusting hole is located between the two connecting holes, so that the first fastener and the second fastener form symmetrical support points. When the axial force of the pressing component acts on the body through the adjusting hole, the force transmission path is symmetrically distributed from left to right, thereby improving the structural stability. In addition, the central arrangement of the adjusting hole ensures that the first connecting hole and the second connecting hole bear equal loads, avoiding the problem of overload of a single connecting hole in the offset structure.

[0022] In one possible implementation, the device further includes a limiting mechanism capable of abutting against the body to limit the rotation of the body relative to the fixed member.

[0023] According to the above-mentioned technical means, the limiting mechanism can restrict the rotation of the main body relative to the fixed part. In this way, the stability of the device can be further improved, and the rotation of the main body due to insufficient fastening force of the first and second fasteners when the push rod and valve spring are coaxially set can be avoided, which would cause the position of the push rod to shift and prevent the push rod from abutting against the valve spring base.

[0024] In one possible implementation, the limiting mechanism includes: a limiting body and a threaded abutment body. The limiting body is fixedly connected to the fixing member. The body has a second adjustment hole and a second internal thread. The threaded abutment body has a second external thread that mates with the second internal thread. The threaded abutment body can abut against the body to limit the rotation of the body relative to the fixing member.

[0025] According to the above-mentioned technical means, the second external thread of the threaded abutment and the second internal thread of the second adjusting hole form a tight threaded connection. When the threaded abutment is tightened, its end face generates a squeezing friction force with the surface of the body, thereby preventing the body from rotating relative to the fixed part. In addition, the length of the threaded abutment between the second adjusting hole and the body can be adjusted. Therefore, by adjusting the length of the threaded abutment between the second adjusting hole and the body, it can be ensured that the threaded abutment can abut against the body no matter how the body is tilted. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0027] Figure 1This is a partial three-dimensional structural schematic diagram of a device provided in an embodiment of this application;

[0028] Figure 2 This is a three-dimensional structural diagram of a device provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a device and an engine cylinder head provided in an embodiment of this application.

[0030] Icon labels:

[0031] 100 - Device; 200 - Camshaft;

[0032] 10-Factor; 10A-First through hole; 10B-First bolt; 11-First mounting hole; 12-First oblong hole;

[0033] 20-Top pressing mechanism; 21-Body; 211-Adjusting hole; 212-First connecting hole; 213-Second connecting hole; 22-Top pressing component; 221-Forcer rod; 222-Top rod; 2221-First limiting structure;

[0034] 30 - First fastener;

[0035] 40 - Second fastener;

[0036] 50 - Limiting mechanism; 51 - Limiting body; 52 - Threaded abutment part. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0041] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0042] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0043] Please see Figure 1 , Figure 2 and Figure 3 This application provides a device 100 for convenient replacement of engine hydraulic tappets, including a fixing member 10 and a pressing mechanism 20.

[0044] The fastener 10 is used for connection to the engine cylinder head. Optionally, the fastener 10 can be as follows: Figure 1 The fastener 10 can also be a block structure, and this application embodiment does not limit this. The fastener 10 can be connected to the engine cylinder head via threaded connection, snap-fit, or other methods, and this application embodiment does not limit this as well. For example, as... Figure 1 and Figure 2 As shown, the bottom of the fastener 10 is provided with three first through holes 10A, and the three first through holes 10A are connected to the engine cylinder head by three first bolts 10B.

[0045] Additionally, the pressing mechanism 20 includes a body 21 and a pressing member 22. The body 21 can be, for example... Figure 2 The block structure shown can also be plate-shaped or other irregular three-dimensional structures, and this embodiment does not limit this. The top pressing member 22 can be referred to in the following description, and will not be described here.

[0046] Furthermore, the body 21 is connected to the fixing member 10. The body 21 may include, but is not limited to, being connected to the fixing member 10 by threaded connection, snap-fit, welding, or adhesive bonding. The body 21 is provided with an adjustment hole 211. A portion of the pressing member 22 passes through the adjustment hole 211, and one end of the pressing member 22 extends out of the adjustment hole 211 and can abut against the valve spring base. The length of the pressing member 22 between the body 21 and the valve spring base is adjustable to adjust the clearance between the valve spring base and the camshaft 200.

[0047] In this way, the connection between the body 21 and the fixing member 10 ensures the stability of force transmission. Furthermore, a portion of the pressing member 22 passes through the adjusting hole 211, with one end extending out of the adjusting hole 211 and abutting against the valve spring base. The length of the pressing member 22 between the body 21 and the valve spring base is adjustable to adjust the clearance between the valve spring base and the camshaft 200. Thus, by pressing the valve spring base with the pressing member 22, the valve spring base is compressed. When the cam's protruding portion (i.e., the tip) is in the upward position, the clearance between the valve spring base and the camshaft 200 is larger. This clearance allows the hydraulic tappet to disengage from the valve and be removed. This eliminates the need to disassemble the camshaft 200 without removing the hydraulic tappet, thereby improving the efficiency of hydraulic tappet assembly and disassembly.

[0048] In some embodiments of this application, the top pressure member 22 includes a force-adjusting rod 221 and a push rod 222. The adjusting hole 211 has a first internal thread, and the outer periphery of the force-adjusting rod 221 has a first external thread that mates with the first internal thread; that is, the first internal thread and the first external thread are threadedly connected. One end of the push rod 222 contacts the force-adjusting rod 221, and the other end of the force-adjusting rod 221 can abut against the valve spring base.

[0049] The push rod 222 has a first limiting structure 2221 at the end opposite to the force-applying rod 221. This first limiting structure 2221 is adapted to cooperate with the valve spring base to facilitate the fixation of the two. For example, the first limiting structure can be a U-shaped groove, and the valve spring base can cooperate with the U-shaped groove. That is, at least a part of the valve spring base is accommodated in the U-shaped groove. In this way, the push rod 222 is prevented from slipping off the valve spring base when it abuts against it due to the lack of a limiting mechanism.

[0050] In this way, since the extension rod 221 has a first external thread on its outer circumference and the adjustment hole 211 has a first internal thread, the first internal thread and the first external thread form a helical transmission pair. This embodiment utilizes the mechanical gain characteristic of the thread to convert the rotational torque applied by the operator into the axial thrust of the push rod 222. This causes the pusher 22 to press against the valve spring base, ensuring the valve spring base is in a compressed state, facilitating the removal of the hydraulic tappet. Furthermore, according to the principle of thread transmission, when the helix angle of the thread is less than the friction angle, the engagement between the first internal thread and the first external thread has a self-locking function. Therefore, the operator does not need to continuously apply force to keep the pusher 22 in a pressing state.

[0051] In some embodiments of this application, the end face of the force-adjusting rod 221 is provided with a receiving hole, and a portion of the push rod 222 is disposed within the receiving hole. In this way, by accommodating a portion of the push rod 222 within the receiving hole, the push rod 222 can be prevented from tilting under load, ensuring that the axial force is transmitted perpendicularly to the valve spring base along the axial direction of the valve spring. Compared to a planar contact structure without a receiving hole, this improves the force transmission efficiency and reduces valve spring wear caused by uneven loading.

[0052] The push rod 222 can be rotatably configured relative to the force-applying rod 221 around its axis. This avoids the first limiting structure 2221 from rotating with the force-applying rod 221 when the push rod 222 rotates coaxially with the force-applying rod 221, which would prevent the limiting mechanism from being unable to limit the valve spring base.

[0053] In some other embodiments of this application, the push rod 222 does not have a receiving hole, and the push rod 222 directly abuts against the end wall of the force-applying rod 221. Thus, the structure is simple, no additional holes are required, and the production process is reduced.

[0054] In some embodiments of this application, the push rod 222 is interference-fitted with the receiving hole. This interference fit generates a radial clamping force between the push rod 222 and the receiving hole, eliminating slight wobble that occurs with a clearance fit. This effectively avoids the problem of force transmission lag caused by clearance during the pressing process. In other embodiments of this application, the push rod 222 can also be clearance-fitted with the receiving hole; this application does not limit the specific embodiment to this.

[0055] In some embodiments of this application, the body 21 is rotatably connected to the fixing member 10, and the central axis of the push rod 222 is parallel to the plane in which the body 21 rotates. It is understood that the installation angle of the valve spring may differ for different engine models. In this embodiment, by rotatably connecting the body 21 to the fixing member 10, the push rod 222 automatically adapts to the angle of the valve spring by rotating the body 21, without requiring tool changes or adjustments to the installation method, thus improving the adaptability of the device 100.

[0056] In one possible structural design, the fastener 10 is provided with a first mounting hole 11 and a first oblong hole 12, the first oblong hole 12 being arranged around the circumference of the first mounting hole 11; the body 21 is provided with a first connecting hole 212 and a second connecting hole 213; the device 100 further includes: a first fastener 30 and a second fastener 40, the first fastener 30 passing through the first mounting hole 11 and the first connecting hole 212 to connect the fastener 10 to the body 21; the second fastener 40 passing through the first oblong hole 12 and the second connecting hole 213 to connect the fastener 10 to the body 21.

[0057] The first fastener 30 and the second fastener 40 may have the same or different structures, and this application embodiment does not limit this. For example, the first fastener 30 may be a bolt, or it may be a combination of a rod with external threads and a nut, and this application embodiment does not limit this.

[0058] In this way, when the angle of the body 21 needs to be adjusted, the first fastener 30 and the second fastener 40 (e.g., bolts) can be loosened. Thus, the first mounting hole 11 and the first fastener 30 form a pivot point, allowing the body 21 to rotate around the axis of the first mounting hole 11. The first oblong hole 12, distributed circumferentially, provides an arc-shaped movement trajectory for the second fastener 40. This facilitates the adjustment of the angle of the body 21. Once the desired angle is achieved, both the first fastener 30 and the second fastener 40 can be tightened, providing two-point fixed support. This prevents the body 21 from continuing to rotate, which could cause the push rod 222 to become misaligned with the valve spring.

[0059] In another possible structural design, the body 21 can also be rotatably connected to the fixing member 10 via a bearing. For example, the body 21 can be connected to the outer ring of the bearing, and the fixing member 10 can be connected to the outer ring of the bearing. In this way, the rotatable connection between the body 21 and the fixing member 10 is relatively smooth, making it convenient for maintenance personnel to adjust the angle of the body 21.

[0060] In some embodiments of this application, the axial direction of the first connecting hole 212 is consistent with the axial direction of the second connecting hole 213, and both are perpendicular to the axial direction of the adjusting hole 211. It should be noted that the consistency between the axial direction of the first connecting hole 212 and the axial direction of the second connecting hole 213 can include: the axial direction of the first connecting hole 212 being parallel to the axial direction of the second connecting hole 213, or the axial direction of the first connecting hole 212 intersecting the axial direction of the second connecting hole 213, and the included angle between the axial direction of the first connecting hole 212 and the axial direction of the second connecting hole 213 being less than or equal to 10°.

[0061] This ensures that the central axis of the push rod 222 is parallel to the plane in which the body 21 rotates, thus enabling quick disassembly of the hydraulic tappets for different engine models.

[0062] In some other embodiments of this application, the axial direction of the first connecting hole 212 is not the same as the axial direction of the second connecting hole 213. This application does not limit this aspect.

[0063] In some embodiments of this application, the adjusting hole 211 is located between the first connecting hole 212 and the second connecting hole 213. This positions the adjusting hole 211 between the two connecting holes, creating symmetrical support points for the first fastener 30 and the second fastener 40. When the axial force of the pressing member 22 acts on the body 21 through the adjusting hole 211, the force transmission path is symmetrically distributed, thereby improving structural stability. Furthermore, the centrally located adjusting hole 211 ensures that the loads borne by the first connecting hole 212 and the second connecting hole 213 are equal, avoiding the problem of overload on a single connecting hole in an offset structure. In other embodiments of this application, the adjusting hole 211 may also be located on the side of the first connecting hole 212 opposite to the second connecting hole 213; this application does not limit this to this specific location.

[0064] In some embodiments of this application, the device 100 further includes a limiting mechanism 50, which abuts against the body 21 to restrict the rotation of the body 21 relative to the fixing member 10. In this way, the limiting mechanism 50 can restrict the rotation of the body 21 relative to the fixing member 10, thereby further improving the stability of the device 100 and preventing the body 21 from rotating due to insufficient tightening force of the first fastener 30 and the second fastener 40 when the push rod 222 is coaxially arranged with the valve spring, causing the push rod 222 to shift position and thus fail to abut against the valve spring base.

[0065] In some embodiments of this application, the limiting mechanism 50 includes: a limiting body 51 and a threaded abutment member 52, wherein the limiting body 51 can be as follows: Figure 1 The plate shown can also be a block or strip structure, and this application embodiment does not limit it.

[0066] In addition, the limiting body 51 is fixedly connected to the fixing member 10. The limiting body 51 can be connected to the fixing member 10 by means of threaded connection, welding, hinge, adhesive bonding, etc. This application embodiment does not limit this.

[0067] In addition, the main body 21 is provided with a second adjustment hole 211, and a second internal thread is provided in the second adjustment hole 211; the threaded abutment member 52 is provided with a second external thread that mates with the second internal thread; the threaded abutment member 52 can abut against the main body 21 to restrict the rotation of the main body 21 relative to the fixing member 10. The threaded abutment member 52 can be a bolt, a plunger with external threads, etc., and this application does not limit it.

[0068] In this way, the second external thread of the threaded abutment 52 and the second internal thread of the second adjusting hole 211 form a tight threaded connection. When the threaded abutment 52 is tightened, its end face generates a squeezing friction with the surface of the body 21, thereby preventing the body 21 from rotating relative to the fixing member 10. In addition, the length of the threaded abutment 52 between the second adjusting hole 211 and the body 21 is adjustable. Therefore, by adjusting the length of the threaded abutment between the second adjusting hole 211 and the body 21, it can be ensured that the threaded abutment can abut against the body 21 no matter how the body 21 is tilted.

[0069] Additionally, it should be noted that, as Figure 1 and Figure 2 As shown, the fastener 10 can be provided with multiple pressing mechanisms 20, for example, such as... Figure 2 As shown, the fixing member 10 is equipped with four pressing mechanisms 20, which are divided into two groups located on opposite sides of the fixing member 10. This allows for the simultaneous disassembly of multiple tappets, further improving the disassembly efficiency of the tappets.

[0070] Furthermore, multiple pressing mechanisms 20 can share a single limiting body 51, for example, such as Figure 2 As shown, a limiting body 51 can be used to limit the two pressing mechanisms 20 on opposite sides of the fixing member 10, thereby reducing the complexity of the device 100 and lowering the manufacturing cost of the device 100.

[0071] Based on the aforementioned device 100 for replacing engine hydraulic tappets, this application embodiment also provides a method for replacing hydraulic tappets, specifically as follows: ① Rotate the camshaft 200 so that the tip of the camshaft 200 at the location where the hydraulic tappet needs to be removed is in a downward position. At this time, the camshaft 200 compresses the valve spring to its minimum position through the hydraulic tappet. ② After removing the cover of the camshaft 200 at the location where the hydraulic tappet needs to be replaced, fix the fixing member 10 to the engine cylinder head using the first bolt 10B. ③ Place the pushrod 222 on the valve spring base, with the U-shaped groove engaging the spring base. Adjust the angle of the body 21 (after adjustment, fix it using the threaded abutment member 52) so that the pushrod 222 can enter the receiving hole of the extension rod 221. ④ Rotate the extension rod 221 downwards so that the pushrod 222 presses against the valve spring base. ⑤ Rotate the camshaft 90°~180° so that the tip of the camshaft 200 is away from the pushrod 222. At this point, pushrod 222 continues to compress the valve spring, and the gap between the spring base and camshaft 200 is at its maximum. Use this gap to remove and replace the hydraulic tappet. ⑥ After replacing the hydraulic tappet, rotate camshaft 200 so that the tip of camshaft 200 presses against the valve spring base again. ⑦ Disassemble device 100 to complete the hydraulic tappet replacement.

[0072] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, the disclosure, and the appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0073] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

[0074] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for facilitating the replacement of an engine hydraulic lifter, comprising: include: A fastener (10) for connecting to an engine cylinder head; The top-pressing mechanism (20) includes: a body (21) and a top-pressing member (22). The body (21) is connected to the fixing member (10). An adjustment hole (211) is provided on the body (21). A portion of the top-pressing member (22) passes through the adjustment hole (211). One end of the top-pressing member (22) extends out of the adjustment hole (211) and can abut against the valve spring base. The length of the top-pressing member (22) between the body (21) and the valve spring base is adjustable to adjust the gap between the valve spring base and the camshaft (200).

2. The apparatus of claim 1, wherein, The top pressure member (22) includes: The force-adding rod (221) has a first internal thread inside the adjusting hole (211) and a first external thread that mates with the first internal thread on the outer periphery of the force-adding rod (221). A push rod (222) is provided, one end of which is in contact with the force-adding rod (221), and the other end of the force-adding rod (221) is able to abut against the valve spring base.

3. The apparatus of claim 2, wherein, The end face of the force-adding rod (221) is provided with a receiving hole, and part of the top rod (222) is disposed in the receiving hole.

4. The apparatus of claim 3, wherein, The push rod (222) is interference-fitted with the receiving hole.

5. The apparatus of claim 2, wherein, The main body (21) is rotatably connected to the fixing member (10), and the central axis of the top rod (222) is parallel to the plane in which the main body (21) rotates.

6. The apparatus of claim 5, wherein, The fastener (10) is provided with a first mounting hole (11) and a first waist-shaped hole (12), the first waist-shaped hole (12) being arranged around the circumference of the first mounting hole (11); the body (21) is provided with a first connecting hole (212) and a second connecting hole (213); The device further includes: The first fastener (30) passes through the first mounting hole (11) and the first connecting hole (212) to connect the fastener (10) to the body (21). The second fastener (40) passes through the first waist-shaped hole (12) and the second connecting hole (213) to connect the fastener (10) to the body (21).

7. The apparatus of claim 6, wherein, The axial direction of the first connecting hole (212) is consistent with the axial direction of the second connecting hole (213), and both are perpendicular to the axial direction of the adjusting hole (211).

8. The apparatus of claim 6, wherein, The adjustment hole (211) is located between the first connecting hole (212) and the second connecting hole (213).

9. The device according to any of claims 5-8, characterized in that The device further includes a limiting mechanism (50) that can abut against the body (21) to restrict the body (21) from rotating relative to the fixing member (10).

10. The apparatus of claim 9, wherein, The limiting mechanism (50) includes: The limiting body (51) is fixedly connected to the fixing member (10). The body (21) is provided with a second adjustment hole (211) and a second internal thread is provided in the second adjustment hole (211). - a threaded abutment element (52) provided with a second external thread cooperating with the second internal thread; the threaded abutment element (52) being abutable against the body (21) to limit the rotation of the body (21) with respect to the fixing element (10).

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