Shaft pin transmission mechanism for hydraulic plunger pump

Abstract

The utility model relates to the technical field of hydraulic plunger pumps, and discloses a shaft pin transmission mechanism for a hydraulic plunger pump, which comprises a transmission shaft, a cylinder body is arranged on the transmission shaft, and a transmission pin is arranged between the transmission shaft and the cylinder body. An original cylindrical pin shaft is designed into the pin shaft with one end provided with the spherical surface, an original linear higher pair is changed into an existing point higher pair through contact of the cylinder body and the transmission pin, the spring damper is additionally arranged at the bottom of the pin shaft, and meanwhile the transmission shaft and the pin shaft move through the cylindrical pair. The indeterminate problem of an original pin shaft transmission mechanism is solved, the design of the whole mechanical structure is increased, the service life of the whole mechanical structure is prolonged, the design structure is small in occupied space and similar to a flexible hinge design, tiny relative displacement between the transmission shaft and the pin shaft is allowed, and transmission of the whole mechanism is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic plunger pumps, in particular to a shaft pin transmission mechanism for a hydraulic plunger pump. Background Art

[0002] Because the plunger pump can work at a higher speed and pressure, it is widely used in industrial and engineering machines. It converts the mechanical energy input by the motor or prime mover into hydraulic energy output. As a front-end energy conversion device, the performance of the plunger pump plays a key role in the entire fluid control system. Generally, the cylinder of the axial piston pump is coaxial with the drive shaft, and the two are connected and driven by splines; the cylinder of the helical piston pump is at an angle of 40° or 45° to the drive shaft, and the two are driven by gears or drive shafts. Modern hydraulic systems have been increasingly valued by major host manufacturers due to the advantages of good controllability and obvious energy-saving effects of the pump control system of the control motor plus hydraulic pump, but higher requirements are placed on the flow pulsation, overall volume size and efficiency of the hydraulic pump. The axial piston pump is designed with a symmetrical structure to reduce pulsation, but the efficiency is not significantly improved, and the volume is nearly doubled under the same specifications; the helical piston pump has a large shaft angle, and the symmetrical design structure is complex and economical, but the efficiency is higher.

[0003] A hydraulic piston pump is designed by combining the symmetrical design structure of the axial piston pump and the design structure of the shaft angle of the inclined axis piston pump. Since there is a small angle between the axial direction of the piston pump cylinder and the drive shaft, a transmission mechanism similar to a three-pronged drive shaft is designed. Through multiple cylindrical pins embedded in the drive shaft and the cylinder, when the drive shaft rotates, the cylinder is driven to move. Theoretically, there are too many actual constraints in the three-pronged universal joint, so it becomes an over-static structure with a degree of freedom F<0. Although this structural irrationality is concealed by the small shaft angle, the elastic deformation of the components and the possible gaps in the kinematic pairs, it will inevitably cause harmful additional stress in the motion, increase the wear of the kinematic pairs, and reduce their service life. Therefore, a hydraulic piston pump shaft pin transmission mechanism is proposed to solve the above-mentioned problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a shaft pin transmission mechanism for a hydraulic plunger pump in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: an axial pin transmission mechanism for a hydraulic plunger pump, including a transmission shaft, a cylinder body is arranged on the transmission shaft, a transmission pin is arranged between the transmission shaft and the cylinder body, the transmission shaft and the pin shaft move through a cylindrical pair, a damping spring is arranged at one end of the transmission pin, and a gasket is arranged at the other end of the damping spring, and the transmission pin, damping spring and gasket are all designed within the transmission circle.

[0006] Preferably, the transmission pin is arranged in a spherical shape on a side close to the cylinder body.

[0007] Preferably, there are three groups of transmission pins, and the three groups of transmission pins are circumferentially arranged at equal intervals on the transmission shaft.

[0008] Preferably, the angle between two adjacent groups of transmission pins is one hundred and twenty degrees.

[0009] Preferably, there are three groups of damping springs and washers, which are respectively arranged on the three groups of transmission pins.

[0010] Preferably, the cylinder body is assembled on the transmission shaft via a cylinder body retainer.

[0011] The utility model adopts the above technical solution, which can bring the following beneficial effects:

[0012] 1. The hydraulic piston pump uses a pin transmission mechanism, which designs the original cylindrical pin into a pin with a spherical surface at one end. The contact between the cylinder body and the transmission pin is changed from the original line height pair to the current point height pair, and a spring damper is added at the bottom of the pin. At the same time, the transmission shaft and the pin move through the cylindrical pair, which solves the problem of the original statically indeterminate pin transmission mechanism and increases the design and service life of the overall mechanical structure.

[0013] 2. The hydraulic piston pump uses a shaft pin transmission mechanism, which has a small space-occupying design and is similar to a flexible hinge design. It allows a small relative displacement between the transmission shaft and the pin shaft without affecting the transmission of the overall mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the appearance diagram of the utility model;

[0015] Figure 2 It is the assembly drawing of the utility model;

[0016] Figure 3 It is a simplified structural diagram of the utility model.

[0017] In the figure: 100, transmission shaft; 101, transmission pin; 102, damping spring; 103, gasket; 104, cylinder body. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0022] See also Figure 1-3An embodiment of the utility model is: a shaft pin transmission mechanism for a hydraulic plunger pump, including a transmission shaft 100, a cylinder body 104 is arranged on the transmission shaft 100, the cylinder body 104 is assembled on the transmission shaft 100 through a cylinder holder, a transmission pin 101 is arranged between the transmission shaft 100 and the cylinder body 104, the transmission shaft 100 and the pin shaft move through a cylindrical pair, the side of the transmission pin 101 close to the cylinder body 104 is spherical, and a damping spring 102 is arranged at one end of the transmission pin 101, the damping spring 102 The other end of the spring 102 is provided with a gasket 103. The transmission pin 101, the damping spring 102 and the gasket 103 are all designed in the transmission circle. There are three groups of transmission pins 101. The three groups of transmission pins 101 are arranged on the transmission shaft 100 at equal intervals. The angle between two adjacent groups of transmission pins 101 is 120 degrees. There are three groups of damping springs 102 and gaskets 103, which are respectively arranged on the three groups of transmission pins 101. By designing the original cylindrical pin shaft into a pin with a spherical surface at one end, The contact between the shaft, cylinder body 104 and transmission pin 101 is changed from the original line height pair to the current point height pair, and a spring damper is added at the bottom of the pin shaft. At the same time, the transmission shaft 100 and the pin shaft move through the cylindrical pair, which solves the problem of super-static determination of the original pin shaft transmission mechanism. The design structure occupies a small space, similar to the flexible hinge design, which allows a small relative displacement between the transmission shaft 100 and the pin shaft without affecting the transmission of the entire mechanism, thereby increasing the design and service life of the overall mechanical structure; the transmission mechanism can not only be designed to be evenly distributed at 120 degrees, but also to be designed with a smaller interval angle when transmitting a larger torque, and more transmission pins 101 can be installed on the transmission shaft 100. When transmitting a smaller torque, it can be designed to be one or two pin shaft transmissions to meet the requirements of stable and reliable transmission; it can also be used in transmission mechanisms in which other transmission bodies and transmission shafts 100 have an angle, and can transmit larger torques and larger speeds, which is suitable for transmission occasions with low and higher speed requirements, and has high practicality.

[0023] Working principle: During the transmission process, the transmission shaft 100 is subjected to the external torque, which drives the three transmission pins 101 spaced 120 degrees apart to move, and then drives the cylinder body 104 to rotate, completing the piston pump's oil suction and discharge cycle.

[0024] The utility model provides a shaft pin transmission mechanism for a hydraulic plunger pump. There are many methods and ways to implement the technical solution. The above is only the preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications should also be regarded as the protection scope of the utility model. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A shaft pin transmission mechanism for a hydraulic piston pump, comprising a transmission shaft (100), characterized in that: A cylinder body (104) is arranged on the transmission shaft (100), a transmission pin (101) is arranged between the transmission shaft (100) and the cylinder body (104), a damping spring (102) is arranged at one end of the transmission pin (101), and a gasket (103) is arranged at the other end of the damping spring (102).

2. The shaft pin transmission mechanism for a hydraulic piston pump according to claim 1, characterized in that: The side of the transmission pin (101) close to the cylinder body (104) is arranged in a spherical shape.

3. The shaft pin transmission mechanism for a hydraulic piston pump according to claim 1, characterized in that: The number of the transmission pins (101) is three groups, and the three groups of transmission pins (101) are equidistantly arranged on the transmission shaft (100) in a circumferential manner.

4. The shaft pin transmission mechanism for a hydraulic piston pump according to claim 3, characterized in that: The included angle between two adjacent groups of the transmission pins (101) is one hundred and twenty degrees.

5. The shaft pin transmission mechanism for a hydraulic piston pump according to claim 1, characterized in that: The damping springs (102) and washers (103) are each provided in three groups, and are respectively arranged on the three groups of driving pins (101).

6. The shaft pin transmission mechanism for a hydraulic piston pump according to claim 1, characterized in that: The cylinder body (104) is assembled on the transmission shaft (100) via a cylinder body retainer.

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