A tappet

Abstract

The utility model provides a kind of tappet belongs to mechanical technical field.It solves how to reduce the problem of tappet wear and tear.This tappet includes the body of cylinder, the inner bottom wall of the body has ball socket, the inner surface of the ball socket is symmetrically set with contact spherical surface one and contact spherical surface two relative to the body center line, the ball center one corresponding to the contact spherical surface one is located in the body center line side close to the contact spherical surface two, and the ball center two corresponding to the contact spherical surface two is located in the body center line side close to the contact spherical surface one, the outer side wall of the body is set with several oil channels along horizontal direction and the ball socket is communicated, and several oil channels are along the body circumferential direction interval arrangement, the closed end face of the body has wear-resistant coating.This tappet can ensure that the wear and tear of itself is lower.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a tappet. Background Technology

[0002] Tappets are used to transmit camshaft torque, converting the torque into the thrust of the valve lifters, which in turn pushes the rocker arms and opens the valves via the valve bridge. They are a very important component in the valve train.

[0003] In an overhead valve train, the tappet is typically cylindrical. It uses a ball joint formed inside its open end to engage with the ball head of the tappet, and a flat surface at its closed end to engage with the camshaft. However, the tappet ball joint and tappet ball head do not achieve a perfect fit; the contact surfaces do not guarantee full contact. They usually achieve a point contact. Over time, wear increases the clearance between the tappet ball joint and tappet ball head, leading to delayed valve opening. Furthermore, the high coefficient of friction between the tappet and camshaft negatively impacts efficiency and causes significant wear on the closed end of the tappet, affecting the lifespan of the tappet and even the engine. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a tappet. The technical problem to be solved by this utility model is: how to reduce the wear of the tappet.

[0005] The objective of this utility model can be achieved through the following technical solution: A push rod, comprising a cylindrical body, wherein a ball socket is provided on the inner bottom wall of the body, characterized in that the inner surface of the ball socket is symmetrically arranged with a first contact ball surface and a second contact ball surface relative to the center line of the body, the center of the ball surface corresponding to the first contact ball surface is located on the side of the center line of the body closer to the second contact ball surface, and the center of the ball surface corresponding to the second contact ball surface is located on the side of the center line of the body closer to the first contact ball surface, a plurality of oil passages communicating with the ball socket are opened on the outer side wall of the body in a horizontal direction, and the plurality of oil passages are arranged at intervals along the circumference of the body, and the closed end face of the body has a wear-resistant coating.

[0006] Compared to existing technologies, this application, by configuring the inner surface of the ball socket within the body as two symmetrical contact surfaces 1 and 2 relative to the body's centerline, and by misaligning the corresponding ball centers 1 and 2 with respect to the centerline, ensures that the ball socket formed within the body has at least two contact surfaces for the ball head to engage with. During operation, the pushrod's ball head can abut against both contact surfaces 1 and 2, simultaneously separating the pushrod's ball head from the bottom of the ball socket. Compared to existing technologies, this approach minimizes point contact between the pushrod's ball head and the inner wall of the ball socket, and reduces local pressure by increasing the number of contact surfaces. This improves the wear resistance of the tappet head and socket, preventing increased clearance between the tappet and tappet from causing valve opening lag. Secondly, lubricating oil is supplied to the cavity inside the body through oil passages opened in the horizontal direction. Under the action of gravity, the lubricating oil enters the socket to lubricate the inner wall of the socket and the tappet head, thereby reducing the coefficient of friction between them. This also reduces the wear of the tappet and tappet. Furthermore, by coating the closed end face of the body with a wear-resistant coating, the end face that mates with the tappet and camshaft has higher hardness and a certain degree of wear resistance, thereby reducing the wear of the tappet working surface.

[0007] In the aforementioned tappet, the open end of the main body has a mounting port, and the ball socket is formed on the bottom wall of the mounting port. The inner ends of each oil passage penetrate the inner sidewall of the mounting port, and the inner ends of each oil passage are eccentrically positioned relative to the centerline of the oil passage. This structural design fully utilizes the space of the main body, maximizing the proximity of the oil passages to the ball socket while preventing the oil passages from affecting the structure of the ball socket. It also ensures a continuous supply of oil to the ball socket through the oil passages, reducing wear on the tappet and pushrod.

[0008] In the aforementioned tappet, the top edge of the socket has an inwardly protruding oil guide portion. This oil guide portion is arc-shaped, and the central angle corresponding to the arc is 50-60 degrees. The presence of the oil guide portion effectively prevents lubricating oil from overflowing from the socket, ensuring sufficient lubricating oil between the inner wall of the socket and the tappet head. Secondly, since the inner end of the oil passage is inclined, the presence of the oil guide portion provides a sufficient guiding effect, allowing the lubricating oil entering the mounting opening to flow into the socket. Furthermore, there are high requirements for the central angle corresponding to the arc of the oil guide portion; this application uses 50-60 degrees as an example. While ensuring the above-mentioned technical effects are achieved, interference between the oil guide portion and the tappet head is also avoided.

[0009] In the aforementioned tappet, a conical oil reservoir is formed on the inner bottom wall of the ball socket, and the centerline of the oil reservoir coincides with the centerline of the main body. The oil reservoir increases the amount of lubricating oil stored in the ball socket, ensuring effective lubrication. Furthermore, the design of its centerline coinciding with the centerline of the main body, meaning the oil reservoir is located at the center of the inner bottom wall of the mounting opening, reduces contact between the tappet head and the edge of the oil reservoir during operation due to the tappet's movement characteristics, thus achieving a certain degree of wear reduction.

[0010] In the aforementioned tappet, the body is made of bearing steel, and the wear-resistant coating is composed of a diamond-like carbon coating material. Specifically, alternatively, a tetrahedral amorphous carbon material can be used, or a metal coating composed of hard chrome or nickel-based alloys can be used, or a compound coating composed of titanium oxide, tungsten carbide, or cubic boron nitride can be used.

[0011] Compared with existing technologies, this thruster has the following advantages:

[0012] By setting two non-concentric contact spheres symmetrically arranged relative to the axis of the body in the ball socket, and cooperating with the ball head of the tappet, a larger contact sphere between the ball head and the ball socket is ensured. At the same time, lubricating oil is supplied to the ball socket through horizontally arranged oil passages, thereby providing sufficient lubrication to reduce friction. Furthermore, a wear-resistant coating is plated on the closed end face of the body to reduce wear between the tappet and the camshaft. Attached Figure Description

[0013] Figure 1 This is a front view of the column.

[0014] Figure 2 It is a sectional view of the main body.

[0015] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0016] In the diagram, 1 is the main body; 11 is the ball socket; 111 is the first contact ball surface; 112 is the second contact ball surface; 113 is the oil guide; 114 is the oil reservoir; 12 is the oil passage; 13 is the wear-resistant coating; 14 is the mounting port; R1 is the first ball center; R2 is the second ball center. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] like Figure 1-3As shown, the push rod includes a cylindrical body 1, with an opening 14 at the end of the body 1. A ball socket 11 is located on the inner bottom wall of the mounting port 14. The inner surface of the ball socket 11 specifically includes a spherical contact surface 111 and a spherical contact surface 112. The contact surface 111 and the contact surface 112 are symmetrically arranged relative to the centerline of the body 1. The center R1 of the ball corresponding to the contact surface 111 is located on the side of the centerline of the body 1 closer to the contact surface 112, and the center R2 of the ball corresponding to the contact surface 112 is located on the side of the centerline of the body 1 closer to the contact surface 111. The distance between R1 and R2 is X, meaning that the contact surface 111 and the contact surface 112 are eccentric structures.

[0019] like Figure 2 and Figure 3 As shown, at the port of the ball socket 11, there is an inwardly protruding arc-shaped oil guide part 113 along the circumferential direction, and the central angle α corresponding to the arc of the oil guide part 113 is 50-60 degrees. A cone-shaped oil storage groove 114 is provided at the bottom center of the ball socket 11, and the center line of the oil storage groove 114 coincides with the center line of the body 1.

[0020] like Figure 2 As shown, a plurality of oil passages 12 are radially formed on the outer side wall of the main body 1 near the closed end. The outer end of the oil passage 12 extends through the outer side wall of the main body 1, and its inner end connects to the mounting port 14. The inner end port is eccentrically set relative to the center line of the oil passage 12, and its specific position is inclined toward the mounting port 14 slot of the main body 1. Through this setting, the inner end port of the oil passage 12 is located above the ball socket 11.

[0021] like Figure 2 As shown, the closed end of the body 1 is planar, and a wear-resistant coating 13 made of diamond-like carbon coating material is deposited on the closed end of the body 1. Specifically, it can be tetrahedral amorphous carbon material. As an alternative, a metal coating made of hard chrome material or nickel-based alloy material can also be used, or a compound coating made of titanium oxide material, tungsten carbide material, and cubic boron nitride material can also be used.

[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0023] Although this document frequently uses terms such as body 1, ball socket 11, contact spherical surface one 111, contact spherical surface two 112, oil guide part 113, oil reservoir 114, oil passage 12, wear-resistant coating 13, mounting port 14, ball center one R1, ball center two R2, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A push rod comprising a cylindrical body (1) having a ball-and-socket socket (11) on its inner bottom wall, characterized in that, The inner surface of the ball socket (11) includes a first contact spherical surface (111) and a second contact spherical surface (112) symmetrically arranged with respect to the center line of the body (1). The center of the ball (R1) corresponding to the first contact spherical surface (111) is located on the side of the center line of the body (1) close to the second contact spherical surface (112), and the center of the ball (R2) corresponding to the second contact spherical surface (112) is located on the side of the center line of the body (1) close to the first contact spherical surface (111). A plurality of oil channels (12) communicating with the ball socket (11) are opened on the outer side wall of the body (1) in the horizontal direction, and the plurality of oil channels (12) are arranged at intervals along the circumference of the body (1). The closed end face of the body (1) has a wear-resistant coating (13).

2. The tappet according to claim 1, characterized in that, The body (1) has an installation port (14) inside its open end. The ball socket (11) is opened on the bottom wall of the groove of the installation port (14). The inner end of each oil passage (12) is arranged through the inner side wall of the installation port (14), and the inner end port of each oil passage (12) is eccentrically arranged relative to the center line of the oil passage (12).

3. The tappet according to claim 1 or 2, characterized in that, The top edge of the ball socket (11) has an inwardly protruding oil guide portion (113), the oil guide portion (113) is arc-shaped and the central angle α corresponding to the arc is 50-60 degrees.

4. The tappet according to claim 3, characterized in that, The inner bottom wall of the ball socket (11) is provided with a conical oil storage groove (114), and the center line of the oil storage groove (114) coincides with the center line of the body (1).

5. The tappet according to claim 4, characterized in that, The body (1) is made of bearing steel, and the wear-resistant coating (13) is made of diamond-like carbon coating material.

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