A cam-slider mechanism

Abstract

This utility model discloses a cam-slider mechanism, including a pump body with a plunger cavity, a drive shaft that passes through the pump body, a plunger with a groove on one side that is axially slidably connected to the plunger cavity, a waist-shaped groove on the pump body above the plunger cavity, a cam connected to the spline at the upper end of the drive shaft, and a plunger pin connected to the end of the cam above the waist-shaped groove that passes through the waist-shaped groove and extends into the groove. This cam-slider mechanism is a device that converts the rotational motion of the cam into the linear motion of the plunger, enabling efficient power transmission and suitable for the long-term stable operation of hydraulic pumps. It can be adjusted to meet the production needs of different hydraulic pumps. Furthermore, the small force on the moving area of ​​the plunger and plunger pin facilitates lubrication, and the plunger pin is easy to disassemble and replace, facilitating the maintenance and repair of the hydraulic pump. This ensures the transmission accuracy and service life of the entire cam-slider mechanism, prevents hydraulic pump malfunctions, and improves the operational stability of the hydraulic pump.

Description

Technical Field

[0001] This utility model relates to the field of transmission mechanism technology, and in particular to a cam slider mechanism. Background Technology

[0002] In the field of hydraulic engineering machinery, hydraulic pumps are a crucial component of hydraulic systems, and various types of hydraulic pumps are commonly used as power sources for cab lifting systems. Among the various types of piston-type hydraulic pumps, the pump relies on the reciprocating motion of a piston within the pump body to change the volume of the sealed working chamber, thereby achieving the pump's oil suction and pressure actions. Piston-type hydraulic pumps often employ a drive shaft structure, where external mechanical energy is transmitted to the drive shaft, which in turn drives a transmission mechanism to rotate, realizing the reciprocating motion of the piston. The cam-slider mechanism is the most commonly used transmission mechanism, used to achieve the hydraulic pump's oil supply function during operation.

[0003] However, traditional cam-slider mechanisms suffer from complex structures and large sizes, limiting their application in hydraulic pumps. This means that cam-slider mechanism transmissions are not suitable for all piston-type hydraulic pumps, resulting in a limited range of applications. Furthermore, cam wear is a critical issue in cam-slider mechanisms, especially under high loads and prolonged operation of the hydraulic pump. Cam wear affects the transmission accuracy and lifespan of the entire cam-slider mechanism, potentially leading to pump malfunctions. Utility Model Content

[0004] To address the problems of complex structure and large size of traditional cam-slider mechanisms in existing technologies, which limit the application of hydraulic pumps, and the fact that cam wear affects the transmission accuracy and service life of the entire cam-slider mechanism, leading to hydraulic pump malfunctions, this utility model provides the following technical solution.

[0005] This utility model discloses a cam slider mechanism, including a pump body with a plunger cavity, a drive shaft that is connected through the pump body, a plunger with a groove on one side that is axially slidably connected to the plunger cavity, a waist-shaped groove that is formed in the pump body above the plunger cavity, a cam that is connected to the spline at the upper end of the drive shaft, and a plunger pin that passes through the waist-shaped groove and extends into the groove at one end of the cam located above the waist-shaped groove.

[0006] As a further technical solution, the cam includes a first mounting hole that is connected to the spline of the drive shaft via a shaft elastic retaining ring and a second mounting hole that is riveted to the plunger pin.

[0007] As a further technical solution, the plunger pin includes a riveted end connected to the second mounting hole and a sliding end that passes through the waist-shaped groove and extends into the groove.

[0008] As a further technical solution, the sliding end is a cylindrical structure.

[0009] As a further technical solution, the moving distance of the plunger pin in the waist-shaped groove is consistent with the sliding distance of the plunger in the plunger cavity.

[0010] As a further technical solution, a reversing valve is connected to one end of the plunger cavity.

[0011] The beneficial effects of this utility model are as follows: The cam-slider mechanism of this utility model is a device that converts the rotational motion of a cam into the linear motion of a plunger. Its structure is simple, it can efficiently transmit power, and it is suitable for the long-term stable operation of hydraulic pumps. Furthermore, it is smaller and less expensive than traditional cam-slider structures, and can be adjusted to meet the production needs of different hydraulic pumps. Simultaneously, the plunger and plunger pin have line contact, resulting in a smaller contact area, facilitating lubrication, and making the plunger pin easier to disassemble and replace. This facilitates the maintenance and repair of the hydraulic pump, ensuring the transmission accuracy and service life of the entire cam-slider mechanism, preventing hydraulic pump malfunctions, and improving the operational stability of the hydraulic pump. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the cam slider mechanism of this utility model; Figure 2 This is an exploded view of the cam connection of the cam slider mechanism of this utility model; Figure 3 This is a cross-sectional schematic diagram of the pump body of the cam slider mechanism of this utility model; Figure 4 This is a cross-sectional schematic diagram of the reversing valve of the cam slider mechanism of this utility model; In the diagram: 1-Pump body; 101-First oil port; 102-Second oil port; 2-Drive shaft; 3-Cam; 301-First mounting hole; 302-Second mounting hole; 4-Plunger pin; 401-Riveted end; 402-Sliding end; 5-Waist-shaped groove; 6-Plunger; 601-Groove; 7-Reversing valve; 8-Plunger cavity; 9-Steel ball; 10-Shaft elastic retaining ring. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0014] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0015] like Figure 1 , Figure 3 and Figure 4 As shown, this utility model discloses a cam-slider mechanism, including a pump body 1 with a plunger cavity 8, and a plunger 6 slidably connected within the plunger cavity 8. A drive shaft 2 is connected through the pump body 1, providing rotational torque. External mechanical energy is transmitted to the drive shaft 2, which drives the cam-slider mechanism to move, achieving linear reciprocating motion of the plunger 6. This linear reciprocating motion of the plunger 6 can draw oil into or discharge oil from the plunger cavity 8. The pump body 1 has a first oil port 101 and a second oil port 102 for oil inlet and outlet. Simultaneously, a reversing valve 7 is connected to one end of the plunger cavity 8. Both the reversing valve 7 and the first oil port 101 are equipped with steel balls 9 for controlling the oil inlet and outlet. Oil intake and discharge control is achieved through the movement of the two steel balls 9. The working principle of the reversing valve 7 and the steel balls 9 adopts existing technology and will not be elaborated further in this utility model.

[0016] like Figure 2 As shown, in a preferred embodiment, the plunger 6 slides axially in the plunger cavity 8, and a groove 601 is provided on one side of the plunger 6. The pump body 1 above the plunger cavity 8 has a waist-shaped groove 5. At this time, the spline at the upper end of the drive shaft 2 passes through the pump body 1 and is connected to a cam 3. The drive shaft 2 can drive the cam 3 to rotate. The end of the cam 3 located above the waist-shaped groove 5 is connected to a plunger pin 4. The plunger pin 4 passes through the waist-shaped groove 5 and extends into the groove 601. When the cam 3 rotates, it can drive the plunger pin 4 to rotate in the waist-shaped groove 5. The lower end of the plunger pin 4 is in the groove 601, which can drive the plunger 6 to make linear motion in the plunger cavity 8. Thus, the drive shaft 2 can convert the rotational motion of the cam 3 into the linear motion of the plunger 6, which can efficiently transmit power and is suitable for the long-term stable operation of the hydraulic pump.

[0017] In this embodiment, the cam 3 is provided with a first mounting hole 301 and a second mounting hole 302. The first mounting hole 301 is connected to the spline of the drive shaft 2. A shaft elastic retaining ring 10 is mounted on the spline at the upper end of the drive shaft 2. The shaft elastic retaining ring 10 is used to fasten the assembly of the cam 3, the pump body 1, and the drive shaft 2. The second mounting hole 302 is used for riveting with the plunger pin 4. Thus, when the cam 3 rotates, it can drive the plunger pin 4 to rotate.

[0018] At this time, the plunger pin 4 includes a riveting end 401 connected to the second mounting hole 302 and a sliding end 402 that passes through the waist-shaped groove 5 and extends into the groove 601. The sliding end 402 has a cylindrical structure, and the movement distance of the plunger pin 4 in the waist-shaped groove 5 is the same as the sliding distance of the plunger 6 in the plunger cavity 8. The cylindrical sliding end 402 is in line contact with the inner wall of the groove 601 of the plunger 6. When the cam 3 drives the plunger pin 4 to move, the force on the moving area of ​​the plunger 6 and the plunger pin 4 is small, the wear of the plunger pin 4 is smaller, and the plunger pin 4 is easy to disassemble and replace, which facilitates the maintenance and repair of the hydraulic pump and ensures the transmission accuracy and service life of the entire cam-slider mechanism.

[0019] The working principle of this utility model is as follows: When the hydraulic pump is running, external mechanical energy is transmitted to the transmission shaft 2. The transmission shaft 2 drives the cam 3 to rotate counterclockwise. The cam 3 drives the plunger pin 4 to move to the limit position in the waist-shaped groove 5. The plunger pin 4 can drive the plunger 6 to make linear motion. The linear motion of the plunger 6 can draw oil into the plunger cavity 8, and the plunger cavity 8 will be filled with oil. When the transmission shaft 2 rotates clockwise in the opposite direction, the cam 3 drives the plunger pin 4 to move to the limit position in the waist-shaped groove 5. The plunger pin 4 can drive the plunger 6 to make linear motion, and discharge the oil in the plunger cavity 8. At this time, a complete transmission process is completed. By repeating this process, the oil supply function of the hydraulic pump is realized.

[0020] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A cam-slider mechanism, comprising a pump body (1) having a plunger cavity (8), wherein a drive shaft (2) is connected through the pump body (1), characterized in that: The plunger cavity (8) is axially slidably connected to a plunger (6) with a groove (601) on one side. The pump body (1) above the plunger cavity (8) has a waist-shaped groove (5). A cam (3) is connected to the spline at the upper end of the drive shaft (2). One end of the cam (3) above the waist-shaped groove (5) is connected to a plunger pin (4) that passes through the waist-shaped groove (5) and extends into the groove (601).

2. The cam-slider mechanism according to claim 1, characterized in that: The cam (3) includes a first mounting hole (301) connected to the spline of the drive shaft (2) via a shaft elastic retaining ring (10) and a second mounting hole (302) riveted to the plunger pin (4).

3. The cam-slider mechanism according to claim 2, characterized in that: The plunger pin (4) includes a riveted end (401) connected to the second mounting hole (302) and a sliding end (402) that passes through the waist groove (5) and extends into the groove (601).

4. The cam-slider mechanism according to claim 3, characterized in that: The sliding end (402) has a cylindrical structure.

5. The cam-slider mechanism according to claim 1, characterized in that: The moving distance of the plunger pin (4) in the waist groove (5) is the same as the sliding distance of the plunger (6) in the plunger cavity (8).

6. The cam-slider mechanism according to claim 1, characterized in that: One end of the plunger cavity (8) is connected to a reversing valve (7).

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