Push rod structure, gas distribution mechanism and engine

Abstract

The utility model provides a push rod structure, an air distribution mechanism and an engine, and the push rod structure comprises a push rod main body which is provided with a connecting hole; the first sleeve sleeves the push rod main body and is in threaded connection with the push rod main body; the connecting part comprises a connecting rod and a first connecting ball and is used for being connected with a rocker arm or a tappet of the valve mechanism, and the connecting rod and the push rod body are inserted into the connecting hole and are in clearance fit with the connecting hole; the second sleeve sleeves the connecting rod and the push rod main body, and the second sleeve is in clearance fit with the push rod main body; wherein the first sleeve is provided with a first contact surface, the second sleeve is provided with a second contact surface, the first contact surface and the second contact surface are both inclined to the cross section of the push rod main body, and the first contact surface and the second contact surface are in contact with each other, so that the push rod main body is separated from the connecting part when the first sleeve and the second sleeve extrude each other. The push rod structure solves the problem that a push rod structure of a valve mechanism in the prior art is poor in universality.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and in particular to a push rod structure, a valve mechanism and an engine. Background Art

[0002] The valve train is a mechanism in the engine. The valve train opens and closes the intake and exhaust valves according to a predetermined rule to realize the intake and exhaust of the engine cylinder. It is generally composed of a camshaft, a tappet (cam follower), a push rod, a rocker arm, a rocker arm shaft, a valve, etc. Among them, both ends of the push rod are provided with a ball head, and both the rocker arm and the tappet are provided with a ball socket. The ball heads and ball sockets at both ends are respectively connected to the rocker arm and the tappet to convert the linear motion of the tappet (cam follower) into the swing of the rocker arm. The rocker arm is a lever structure, which converts the linear motion of the tappet (cam follower) at one end into the linear motion of the valve at the other end through the swing of the rocker arm.

[0003] In the prior art, the ball heads at both ends of the push rod are fixedly connected to the push rod body by interference fit. When the load is large, the interference fit is destroyed, causing the push rod to collapse to protect other components of the valve mechanism. The interference fit is sensitive to size, and the axial force limit for destroying the interference fit cannot be accurately controlled. When the interference fit is large, the push rod cannot be destroyed, and the push rod may not be able to play a normal protective role. When the interference fit is small, it may be too sensitive to abnormal working conditions, and the push rod may collapse frequently. In this way, push rods of different sizes need to be changed according to different working conditions, resulting in poor matching versatility of the push rods. Utility Model Content

[0004] The main purpose of the utility model is to provide a push rod structure, a valve mechanism and an engine, so as to solve the problem of poor versatility of the push rod structure of the valve mechanism in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a push rod structure is provided, including: a push rod body, having a connecting hole; a first sleeve, the first sleeve is sleeved on the push rod body and is threadedly connected to the push rod body; a connecting component, the connecting component includes a connecting rod and a first connecting ball, the first connecting ball is used to connect to the rocker arm or tappet of the valve mechanism, the connecting rod and the push rod body are inserted in the connecting hole, and are clearance-matched with the connecting hole; a second sleeve, the second sleeve is sleeved on the connecting rod and the push rod body, and the second sleeve and the push rod body are clearance-matched; wherein, the first sleeve has a first contact surface, and the second sleeve has a second contact surface, the first contact surface and the second contact surface are both inclined to the cross-section of the push rod body, the first contact surface and the second contact surface are in contact with each other, so that when the first sleeve and the second sleeve are squeezed against each other, the first sleeve generates a torque to loosen the thread, thereby causing the first sleeve, the second sleeve and the connecting component to move toward a direction close to the push rod body.

[0006] Furthermore, the end face of the first sleeve close to one end of the second sleeve is a first helical surface structure, and the part where the first helical surface structure contacts the second sleeve is a first contact surface; and / or, the end face of the second sleeve close to one end of the first sleeve is a second helical surface structure, and the part where the second helical surface structure contacts the first sleeve is a second contact surface.

[0007] Further, the first sleeve has a first sleeve body and a first protrusion connected to each other, and the first protrusion has a first contact surface; the second sleeve has a second sleeve body and a second protrusion connected to each other, and the second protrusion has a second contact surface.

[0008] Further, the maximum angle between the first contact surface and the cross section of the push rod body ranges from 30° to 45°; and / or the maximum angle between the second contact surface and the cross section of the push rod body ranges from 30° to 45°.

[0009] Furthermore, the connecting rod includes: a first connecting rod segment; a second connecting rod segment, the second connecting rod segment and the first connecting rod segment are connected to each other, and the second connecting rod segment is connected to the first connecting ball; wherein, the outer diameter of the first connecting rod segment is smaller than the outer diameter of the second connecting rod segment, so that a first limiting step is formed between the second connecting rod segment and the first connecting rod segment, and a first limiting protrusion is arranged in the barrel cavity of the second sleeve, and the first limiting step is limitedly matched with the first limiting protrusion.

[0010] Furthermore, the push rod body includes: a first push rod segment; a second push rod segment, the second push rod segment and the first push rod segment are connected to each other, and the second push rod segment is connected to the connecting rod; wherein, the outer diameter of the first push rod segment is smaller than the outer diameter of the second push rod segment, so that a second limiting step is formed between the first push rod segment and the second push rod segment, and a second limiting protrusion is provided in the barrel cavity of the first sleeve, and the second limiting step is limitedly matched with the second limiting protrusion.

[0011] Furthermore, the axis of the connecting rod is eccentrically arranged with respect to the axis of the push rod body.

[0012] Furthermore, the push rod body has: a connecting hole, the connecting holes are connected to the connecting holes, the axes of the connecting holes are spaced apart from each other, and the connecting rod is passed through the connecting hole; wherein the aperture of the connecting hole is larger than the aperture of the connecting hole, so that a third limiting step is formed between the connecting hole and the connecting hole, so that when the push rod body and the first connecting ball move relative to each other, the third limiting step cooperates with the connecting rod to limit the position.

[0013] According to a second aspect of the utility model, a valve mechanism is provided, comprising: the above-mentioned push rod structure; a rocker arm and a tappet, wherein two ends of the push rod structure are respectively connected to the rocker arm and the tappet.

[0014] According to a second aspect of the utility model, an engine is provided, comprising: the above-mentioned valve mechanism; and a cylinder, wherein the valve mechanism is mounted on the cylinder.

[0015] Applying the technical solution of the utility model, the utility model provides a push rod structure, a valve mechanism and an engine, the push rod structure comprising: a push rod body, which has a connecting hole; a first sleeve, a first sleeve sleeved on the push rod body and threadedly connected to the push rod body; a connecting component, the connecting component comprising a connecting rod and a first connecting ball, the first connecting ball is used to connect to a rocker arm or a tappet of the valve mechanism, the connecting rod and the push rod body are inserted into the connecting hole, and are clearance-matched with the connecting hole; a second sleeve, the second sleeve is sleeved on the connecting rod and the push rod body, and the second sleeve and the push rod body are clearance-matched; wherein the first sleeve has a first contact surface, the second sleeve has a second contact surface, and the first contact surface and the second contact surface are both inclined to the transverse direction of the push rod body. The cross-section is set, the first contact surface and the second contact surface are in contact with each other, so that when the first sleeve and the second sleeve are squeezed against each other, the first sleeve generates a torque to loosen the thread. In this way, when the first sleeve and the second sleeve are squeezed under the action of the rocker arm or the tappet, the first sleeve, the second sleeve and the connecting component can be moved in the direction close to the push rod body, thereby playing a role in buffering the impact force, thereby preventing further damage or failure from spreading to other parts of the valve mechanism, so as to protect other important parts. In addition, when designing the push rod structure, there is no need to consider the influence of the interference fit on the breakage of the push rod, so that the push rod structure is suitable for various types / multi-working conditions of valve mechanisms, thereby improving the versatility of the push rod structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The overall structural schematic diagram of an embodiment of the push rod structure according to the utility model is shown;

[0018] Figure 2 Shown according to Figure 1 An enlarged schematic diagram of the cooperation between the first sleeve and the second sleeve of the push rod structure;

[0019] Figure 3 A cross-sectional view of an embodiment of a push rod structure according to the utility model is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. Push rod body; 101. Connecting hole; 11. First push rod section; 12. Second push rod section; 110. Second limiting step; 102. Connecting hole; 103. Third limiting step;

[0022] 20, first sleeve; 200, first contact surface; 21, first sleeve body; 22, first protrusion; 201, second limiting protrusion; 30, connecting component; 31, connecting rod; 32, first connecting ball; 311, first connecting rod segment; 312, second connecting rod segment; 310, first limiting step;

[0023] 40. Second sleeve; 400. Second contact surface; 41. Second sleeve body; 42. Second protrusion; 401. First limiting protrusion; 5. Second connecting ball. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Please refer to Figures 1 to 3 The utility model provides a push rod structure, including: a push rod body 10, having a connecting hole 101; a first sleeve 20, the first sleeve 20 is sleeved on the push rod body 10 and is threadedly connected to the push rod body 10; a connecting component 30, the connecting component 30 includes a connecting rod 31 and a first connecting ball 32, the first connecting ball 32 is used to connect with a rocker arm or a tappet of a valve mechanism, the connecting rod 31 and the push rod body 10 are inserted into the connecting hole 101, and are clearance-matched with the connecting hole 101; a second sleeve 40, the second sleeve 40 is sleeved on the connecting rod 31 and the push rod body 10, and the second sleeve 40 and the push rod body 10 are clearance-matched; wherein the first sleeve 20 has a first contact surface 200, the second sleeve 40 has a second contact surface 400, the first contact surface 200 and the second contact surface 400 00 are inclined to the cross-section of the push rod body 10, and the first contact surface 200 and the second contact surface 400 are in contact with each other, so that when the first sleeve 20 and the second sleeve 40 are squeezed against each other, the first sleeve 20 generates a torque to loosen the thread. In this way, when the first sleeve and the second sleeve are squeezed under the action of the rocker arm or the tappet, the first sleeve, the second sleeve and the connecting component can be moved in the direction close to the push rod body, thereby playing a role in buffering the impact force, thereby preventing further damage or failure from spreading to other components of the valve mechanism, so as to protect other important components. In addition, when designing the push rod structure, there is no need to consider the influence of the interference fit on the push rod fracture, so that the push rod structure is suitable for various types / multi-condition valve mechanisms, thereby improving the versatility of the push rod structure.

[0026] In the present application, the end surface of the first sleeve 20 close to one end of the second sleeve 40 is a first helical surface structure, and the portion where the first helical surface structure contacts the second sleeve 40 is a first contact surface 200; and / or, the end surface of the second sleeve 40 close to one end of the first sleeve 20 is a second helical surface structure, and the portion where the second helical surface structure contacts the first sleeve 20 is a second contact surface 400. In this way, it is convenient to make the two helical surfaces contact to generate a torque that loosens the thread, so that the structure between the first sleeve 20 and the second sleeve 40 is compact.

[0027] In order to set the first contact surface and the second contact surface, in an embodiment of the present application, the first sleeve 20 has a first sleeve body 21 and a first protrusion 22 connected to each other, and the first protrusion 22 has a first contact surface 200; the second sleeve 40 has a second sleeve body 41 and a second protrusion 42 connected to each other, and the second protrusion 42 has a second contact surface 400.

[0028] Optionally, the maximum angle between the first contact surface 200 and the cross section of the push rod body 10 is in the range of 30° to 45°; and / or the maximum angle between the second contact surface 400 and the cross section of the push rod body 10 is in the range of 30° to 45°. By setting the angle between the first contact surface and the second contact surface, it is ensured that the angle is greater than the equivalent friction angle of the helical surface, so as to ensure that a suitable radial component force can be generated when the first contact surface and the second contact surface are squeezed.

[0029] like Figure 3 As shown, the connecting rod 31 includes: a first connecting rod segment 311 and a second connecting rod segment 312, the second connecting rod segment 312 and the first connecting rod segment 311 are connected to each other, and the second connecting rod segment 312 is connected to the first connecting ball 32; wherein, the outer diameter of the first connecting rod segment 311 is smaller than the outer diameter of the second connecting rod segment 312, so that a first limiting step 310 is formed between the second connecting rod segment 312 and the first connecting rod segment 311, and a first limiting protrusion 401 is provided in the barrel cavity of the second sleeve 40, and the first limiting step 310 is limitedly matched with the first limiting protrusion 401. Through the above-mentioned arrangement, when the first connecting ball 32 impacts toward the first sleeve 20, pressure is applied to the first limiting protrusion 401 through the first limiting step 310, so that the second sleeve 40 applies pressure to the first sleeve 20, and then the first sleeve 20 and the second sleeve 40 are squeezed against each other, and a radial component force is generated to loosen the threads of the first sleeve 20 and the push rod body 10, and the connection component can be prevented from slipping by the limiting between the first limiting protrusion 401 and the first limiting step 310.

[0030] In an optional embodiment of the present application, the thread direction of the second sleeve 40 connecting to the push rod body 10 is opposite to the thread direction of the first sleeve 20 connecting to the push rod body 10, so that when the first sleeve 20 and the second sleeve 40 are squeezed against each other, due to the action force and the reaction force, the first sleeve 20 and the second sleeve 40 can rotate in opposite directions, so that the first sleeve 20 and the second sleeve 40 are both loosened from the push rod body 10, so that the push rod body 10 and the connecting part 30 are separated.

[0031] like Figure 3 As shown, the push rod body 10 includes: a first push rod segment 11 and a second push rod segment 12, the second push rod segment 12 and the first push rod segment 11 are connected to each other, and the second push rod segment 12 is connected to the connecting rod 31; wherein, the outer diameter of the first push rod segment 11 is smaller than the outer diameter of the second push rod segment 12, so that a second limiting step 110 is formed between the first push rod segment 11 and the second push rod segment 12, and a second limiting protrusion 201 is provided in the barrel cavity of the first sleeve 20, and the second limiting step 110 is limitedly matched with the second limiting protrusion 201. Through the above arrangement, during the normal use of the push rod structure, the connection between the push rod body 10 and the first sleeve 20 can be made reliable, thereby making the connection between the push rod body 10 and the connecting component 30 reliable, and preventing the connecting component 30 and the push rod body 10 from separating during normal use.

[0032] Optionally, the clearance fit between the connecting rod 31 and the push rod body 10 and the clearance fit between the second sleeve 40 and the push rod body 10 of the present application are both high-precision clearance fits, which are not prone to displacement without external force.

[0033] Optionally, the gap between the connecting rod 31 and the push rod body 10 and the gap between the second sleeve 40 and the push rod body 10 are both 0.2 mm.

[0034] In an embodiment of the present application, the axis of the connecting rod 31 is eccentrically arranged with respect to the axis of the push rod body 10, so as to ensure that the connecting rod 31 will not rotate relative to the push rod body 10. If the connecting rod 31 is rotatable, it will perform a downward spiral motion along the push rod body 10 under the action of the rocker arm pressure and lose its proper function.

[0035] like Figure 3As shown, the push rod body 10 has: a connecting hole 102, the connecting hole 101 is connected with the connecting hole 102, the axis of the connecting hole 101 is arranged at an interval with the axis of the connecting hole 102, and the connecting rod 31 is inserted into the connecting hole 101; wherein, the aperture of the connecting hole 101 is larger than the aperture of the connecting hole 102, so that a third limiting step 103 is formed between the connecting hole 102 and the connecting hole 101, so that when the push rod body 10 and the first connecting ball 32 move relative to each other, the third limiting step 103 and the connecting rod 31 are limitedly matched. Through the above arrangement, during the normal operation of the push rod structure, displacement occurs between the connecting rod 31 and the push rod body 10, and the limiting cooperation between the third limiting step 103 and the connecting rod 31 can prevent the connecting component from falling completely into the push rod body 10, thereby ensuring the reliability of the use of the push rod structure.

[0036] Specifically, the push rod structure also includes a second connecting ball 5. The first connecting ball 32 is connected to one end of the push rod body 10. The second connecting ball 5 is located at the other end of the push rod body 10. The second connecting ball 5 is used to connect to the tappet of the valve mechanism.

[0037] Optionally, the second connecting ball is fixedly connected to the push rod body 10; or, the push rod structure also includes a mating connecting rod connected to the second connecting ball 5, the mating connecting rod and the second connecting ball 5 form a mating connecting component, and the connection method between the mating connecting component and the push rod body 10 is similar to the above-mentioned connection method between the first connecting component 30 and the push rod body 10.

[0038] The utility model provides a valve mechanism, comprising: the push rod structure mentioned above; a rocker arm and a tappet, wherein the two ends of the push rod structure are connected to the rocker arm and the tappet respectively. By setting the push rod structure mentioned above, when the push rod load is too large, other parts of the valve mechanism can be protected from damage, and the versatility of the push rod structure is improved, and the production cost of the valve mechanism is reduced.

[0039] The utility model also provides an engine, comprising: the above-mentioned valve mechanism; a cylinder, and the valve mechanism is installed on the cylinder.

[0040] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0041] The utility model provides a push rod structure, a valve mechanism and an engine, wherein the push rod structure comprises: a push rod body 10, having a connecting hole 101; a first sleeve 20, wherein the first sleeve 20 is sleeved on the push rod body 10 and is threadedly connected to the push rod body 10; a connecting component 30, wherein the connecting component 30 comprises a connecting rod 31 and a first connecting ball 32, wherein the first connecting ball 32 is used to connect to a rocker arm or a tappet of the valve mechanism, wherein the connecting rod 31 and the push rod body 10 are inserted into the connecting hole 101 and are clearance-matched with the connecting hole 101; a second sleeve 40, wherein the second sleeve 40 is sleeved on the connecting rod 31 and the push rod body 10, wherein the second sleeve 40 and the push rod body 10 are clearance-matched; wherein the first sleeve 20 has a first contact surface 200, and the second sleeve 40 has a second contact surface 400, wherein the first contact surface 200 and The second contact surfaces 400 are arranged to be inclined to the cross-section of the push rod body 10, and the first contact surfaces 200 and the second contact surfaces 400 contact each other, so that when the first sleeve 20 and the second sleeve 40 are squeezed against each other, the first sleeve 20 generates a torque to loosen the thread. In this way, when the first sleeve and the second sleeve are squeezed under the action of the rocker arm or the tappet, the first sleeve, the second sleeve and the connecting component can be moved in a direction close to the push rod body, thereby playing a role in buffering the impact force, thereby preventing further damage or failure from spreading to other components of the valve mechanism, so as to protect other important components. In addition, when designing the push rod structure, there is no need to consider the influence of the interference fit on the push rod fracture, so that the push rod structure is suitable for various types / multi-working conditions of valve mechanisms, thereby improving the versatility of the push rod structure.

[0042] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A push rod structure, characterized in that: include: The push rod body (10) has a connecting hole (101); A first sleeve (20), the first sleeve (20) being sleeved on the push rod body (10) and being threadedly connected to the push rod body (10); A connecting component (30), the connecting component (30) comprising a connecting rod (31) and a first connecting ball (32), the first connecting ball (32) being used to connect to a rocker arm or a tappet of a valve mechanism, the connecting rod (31) and the push rod body (10) being inserted into the connecting hole (101) and having a clearance fit with the connecting hole (101); A second sleeve (40), wherein the second sleeve (40) is sleeved on the connecting rod (31) and the push rod body (10), and the second sleeve (40) and the push rod body (10) are clearance-matched; The first sleeve (20) has a first contact surface (200), and the second sleeve (40) has a second contact surface (400). The first contact surface (200) and the second contact surface (400) are both inclined to the cross section of the push rod body (10). The first contact surface (200) and the second contact surface (400) are in contact with each other, so that when the first sleeve (20) and the second sleeve (40) are pressed against each other, the first sleeve (20) generates a torque to loosen the thread, thereby causing the first sleeve (20), the second sleeve (40) and the connecting component (30) to move in a direction close to the push rod body (10).

2. The push rod structure according to claim 1, characterized in that: An end surface of the first sleeve (20) close to one end of the second sleeve (40) is a first helical surface structure, and a portion where the first helical surface structure contacts the second sleeve (40) is the first contact surface (200); and / or, An end surface of the second sleeve (40) close to one end of the first sleeve (20) is a second helical surface structure, and a portion of the second helical surface structure in contact with the first sleeve (20) is the second contact surface (400).

3. The push rod structure according to claim 1, characterized in that: The first sleeve (20) comprises a first sleeve body (21) and a first protrusion (22) connected to each other, and the first protrusion (22) comprises the first contact surface (200); The second sleeve (40) comprises a second sleeve body (41) and a second protrusion (42) which are connected to each other, and the second protrusion (42) comprises the second contact surface (400).

4. The push rod structure according to any one of claims 1 to 3, characterized in that: The maximum angle between the first contact surface (200) and the cross section of the push rod body (10) is in the range of 30° to 45°; and / or, The maximum angle between the second contact surface (400) and the cross section of the push rod body (10) is in the range of 30° to 45°.

5. The push rod structure according to any one of claims 1 to 3, characterized in that: The connecting rod (31) comprises: A first connecting rod section (311); A second connecting rod segment (312), wherein the second connecting rod segment (312) and the first connecting rod segment (311) are connected to each other, and the second connecting rod segment (312) is connected to the first connecting ball (32); The outer diameter of the first connecting rod segment (311) is smaller than the outer diameter of the second connecting rod segment (312), so that a first limiting step (310) is formed between the second connecting rod segment (312) and the first connecting rod segment (311), and a first limiting protrusion (401) is arranged in the barrel cavity of the second sleeve (40), and the first limiting step (310) is limitedly matched with the first limiting protrusion (401).

6. The push rod structure according to any one of claims 1 to 3, characterized in that: The push rod body (10) comprises: A first push rod section (11); A second push rod segment (12), the second push rod segment (12) and the first push rod segment (11) are connected to each other, and the second push rod segment (12) is connected to the connecting rod (31); The outer diameter of the first push rod segment (11) is smaller than the outer diameter of the second push rod segment (12), so that a second limiting step (110) is formed between the first push rod segment (11) and the second push rod segment (12), and a second limiting protrusion (201) is arranged in the barrel cavity of the first sleeve (20), and the second limiting step (110) is matched with the second limiting protrusion (201) for limiting purpose.

7. The push rod structure according to any one of claims 1 to 3, characterized in that: The axis of the connecting rod (31) is eccentrically arranged with respect to the axis of the push rod body (10).

8. The push rod structure according to claim 7, characterized in that: The push rod body (10) has: a communicating hole (102), the connecting hole (101) being in communication with the communicating hole (102), the axis of the connecting hole (101) being spaced apart from the axis of the communicating hole (102), and the connecting rod (31) being inserted into the connecting hole (101); The diameter of the connecting hole (101) is larger than the diameter of the communicating hole (102), so that a third limiting step (103) is formed between the communicating hole (102) and the connecting hole (101), so that when the push rod body (10) and the first connecting ball (32) move relative to each other, the third limiting step (103) cooperates with the connecting rod (31) to limit the position.

9. A valve train, characterized in that: include: The push rod structure according to any one of claims 1 to 8; A rocker arm and a tappet, wherein both ends of the push rod structure are respectively connected to the rocker arm and the tappet.

10. An engine, characterized in that: include: The valve train according to claim 9; A cylinder, wherein the valve mechanism is mounted on the cylinder.

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