Hydraulic pump accurate in positioning

Abstract

The utility model relates to a hydraulic pump accurate in positioning. Comprising a first shell, a first through hole, a first cavity, a second through hole, a positioning mechanism, a second shell and a third through hole, wherein the first through hole is fixedly formed in the first shell; the first cavity is fixedly formed in the first shell; the second through hole is fixedly formed in the first shell; the driving mechanism is fixedly arranged on the first shell and the second shell, and the communication mechanism is fixedly arranged on the second shell; by arranging the positioning mechanism, when oil supply needs to be suspended, the cradle is positioned, and the problem of oil leakage caused by rotation of the cradle due to vibration is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, and particularly relates to a hydraulic pump with accurate positioning. Background Art

[0002] A hydraulic pump is a power component of a hydraulic system. It is driven by an engine or a motor, sucks oil from a hydraulic oil tank, forms pressurized oil and discharges it, and is a component that sends the oil to an actuator, converting mechanical energy into hydraulic energy. A plunger pump is a common type of hydraulic pump. It relies on the reciprocating movement of a plunger in a cylinder block to change the volume of a sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, and convenient flow regulation, and is widely used in occasions with high pressure, large flow, and flow regulation requirements, such as in automobiles and ships.

[0003] The plunger pump adjusts the oil suction and oil pressure by adjusting the moving stroke of the plunger. During use, there will be situations where it is necessary to pause the oil supply. The existing plunger pump adjusts the moving stroke of the plunger by adjusting the rotation angle of the rocker arm, so that the volume does not change when the plunger rotates, and no pressure difference is generated, that is, the oil suction and oil pressure are paused. However, the working environment of the plunger pump often has vibrations, and the existing plunger pump does not have a device for positioning the rocker arm. The rocker arm will rotate slightly due to vibrations, resulting in a small volume difference when the plunger rotates, and thus a pressure difference is formed, causing oil leakage. Summary of the Utility Model

[0004] The content part of this application is used to briefly introduce concepts, which will be described in detail in the subsequent detailed implementation part. The content part of this application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0005] To solve the technical problems mentioned in the above background art part, some embodiments of this application provide a hydraulic pump with accurate positioning, including a first housing, a first through hole fixedly arranged on the first housing, a first cavity fixedly arranged on the first housing, a second through hole fixedly arranged on the first housing, a positioning mechanism rotatably arranged in the first cavity and passing through the second through hole, a second housing fixedly arranged on the first housing, a third through hole fixedly arranged on the second housing, a driving mechanism fixedly arranged on the first housing and the second housing, and a connecting mechanism fixedly arranged on the second housing.

[0006] Specifically, the driving mechanism includes a first bearing fixedly arranged on the first housing, a first sealing assembly fixedly arranged on the first housing, and a driving shaft rotatably passing through the first through hole and the third through hole, passing through the first bearing, and passing through the first sealing assembly.

[0007] Specifically, the first sealing assembly includes a first sealing ring fixedly arranged on the first housing and a first elastic ring fixedly arranged on the first sealing ring.

[0008] Specifically, the communication mechanism includes a first oil inlet fixedly arranged on the second housing, an oil inlet pipe fixedly arranged on the second housing, a second oil inlet fixedly arranged on the second housing, a first oil outlet fixedly arranged on the second housing, an oil outlet pipe fixedly arranged on the second housing, and a second oil outlet fixedly arranged on the second housing.

[0009] Specifically, the positioning mechanism includes a rocker rotating through the first cavity and rotating through the second through hole, a fourth through hole fixedly arranged on the rocker, a trunnion fixedly arranged on the first housing, a second sealing ring fixedly arranged on the first housing, a limiting assembly fixedly arranged on the trunnion and the rocker, and a second elastic ring fixedly arranged on the second sealing ring.

[0010] Specifically, the limiting assembly includes a mounting groove fixedly arranged on the rocker, a return groove fixedly arranged on the trunnion, a spring seat slidably arranged on the mounting groove, a spring with one end fixedly arranged on the rocker and the other end fixedly arranged on the spring seat, and a steel ball slidably arranged on the mounting groove.

[0011] The beneficial effects of the present utility model are as follows:

[0012] (1) Through the cooperation of the steel ball, the spring and the return groove, the rocker can be accurately positioned, avoiding small - amplitude rotation due to vibration, so that there will still be a small - amplitude volume difference when the plunger rotates, thereby forming a pressure difference and causing oil leakage.

[0013] (2) The positioning mechanism is arranged inside the hydraulic pump, and there is hydraulic oil lubrication inside the hydraulic pump, which can avoid the rust of the positioning mechanism and reduce wear at the same time.

[0014] (3) The positioning mechanism is arranged inside the hydraulic pump. Compared with being arranged outside, the hydraulic pump has a smaller volume, is more convenient for installation, and is more suitable for equipment with a smaller installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of this application are used to provide a further understanding of this application, making other features, objectives, and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation of this application.

[0016] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the elements and elements are not necessarily drawn to scale.

[0017] In the drawings:

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a top view of the present utility model;

[0020] Figure 3 is Figure 2 a sectional view taken along line A-A in

[0021] Figure 4 is Figure 3 a sectional view taken along line B-B in

[0022] Figure 5 is a sectional view of the positioning mechanism. Specific embodiments

[0023] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for illustrative purposes and are not used to limit the scope of protection of the present disclosure.

[0024] In addition, it should be noted that for the sake of convenience of description, only parts related to the relevant utility model are shown in the drawings. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0025] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence relationship of the functions performed by these devices, modules or units.

[0026] It should be noted that the modifications of "one" and "plural" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly stated in the context, it should be understood as "one or more".

[0027] The present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] Refer to Figures 1-5As shown in the figure, a hydraulic pump with precise positioning of the present utility model includes a first housing 1, a first through hole 2 fixedly arranged on the first housing, a first cavity 3 fixedly arranged on the first housing, a second through hole 4 fixedly arranged on the first housing, a positioning mechanism 5 rotatably arranged in the first cavity and passing through the second through hole, a second housing 6 fixedly arranged on the first housing, a third through hole 7 fixedly arranged on the second housing, a driving mechanism 8 fixedly arranged on the first housing and the second housing, and a connecting mechanism 9 fixedly arranged on the second housing; the first housing and the second housing are fixedly connected by a nut; the first cavity is used for installing the positioning mechanism and the plunger, and the plunger is a prior art; the positioning mechanism can achieve precise positioning, avoiding the problem that the positioning mechanism rotates due to vibration when the hydraulic pump pauses, resulting in oil leakage; the driving mechanism is used to drive the plunger to rotate around the driving shaft and with the driving shaft as the axis; the connecting mechanism is used to connect to the fuel tank.

[0029] Specifically, the driving mechanism includes a first bearing 81 fixedly arranged on the first housing, a first sealing assembly 82 fixedly arranged on the first housing, a driving shaft 83 rotatably passing through the first through hole and the third through hole, passing through the first bearing, and passing through the first sealing assembly; the inner wall of the first bearing contacts the driving shaft to reduce the rotational resistance of the driving shaft; the first sealing assembly is used for sealing; the outside of the driving shaft is connected to an external driving device, which is used to drive the plunger to rotate around the driving shaft and with the driving shaft as the axis.

[0030] Specifically, the first sealing assembly includes a first sealing ring 821 fixedly arranged on the first housing and a first elastic ring 822 fixedly arranged on the first sealing ring; the first elastic ring is used to tighten the first sealing ring, so that the first sealing ring closely fits the driving shaft, strengthening the sealing effect.

[0031] Specifically, the connecting mechanism includes a first oil inlet 91 fixedly arranged on the second housing, an oil inlet pipe 92 fixedly arranged on the second housing, a second oil inlet 93 fixedly arranged on the second housing, a first oil outlet 94 fixedly arranged on the second housing, an oil outlet pipe 95 fixedly arranged on the second housing, and a second oil outlet 96 fixedly arranged on the second housing; hydraulic oil enters the oil inlet pipe from the first oil inlet, enters the plunger from the second oil inlet, is squeezed out by the plunger from the second oil outlet to the oil outlet pipe, and is discharged from the second oil outlet; the first oil outlet and the second oil outlet are arc-shaped openings. When the plunger rotates around the driving shaft, it has a half stroke for oil suction and a half stroke for oil pressure. Therefore, the first oil outlet and the second oil outlet need to be designed as arc-shaped to make the most of the working stroke when the plunger rotates and improve the working efficiency of the hydraulic pump.

[0032] Specifically, the positioning mechanism includes a cradle 51 that rotates and passes through the first cavity and the second through hole, a fourth through hole 52 fixedly provided on the cradle, an ear shaft 53 fixedly provided on the first shell, a second sealing ring 54 fixedly provided on the first shell, a limiting assembly 55 fixedly provided on the ear shaft and the cradle, and a second elastic ring 56 fixedly provided on the second sealing ring; the cradle can rotate a certain angle in the first cavity; the drive shaft passes through the fourth through hole, and the diameter of the fourth through hole is much larger than the diameter of the drive shaft to prevent the cradle from contacting the drive shaft after rotation; the second sealing ring and the second elastic ring are used for sealing; the limiting assembly is used to limit the cradle.

[0033] Specifically, the limit assembly includes a mounting groove 551 fixed on the cradle, a return groove 552 fixed on the ear shaft, a spring seat 553 slidably arranged on the mounting groove, a spring 554 with one end fixed on the cradle and the other end fixed on the spring seat, and a steel ball 555 slidably arranged on the mounting groove; in the normal working room of the hydraulic pump, the cradle is tilted, that is, there is a certain rotation angle. When the plunger rotates with the drive shaft as the axis, the end in contact with the cradle will stretch and shorten during the rotation, thereby generating a pressure difference, sucking in and pressing out the hydraulic oil. At this time, the steel ball disengages from the return groove and is squeezed back into the mounting groove by the second shell. At this time, the spring is compressed. When the hydraulic pump needs to stop working, the cradle is rotated, and the cradle drives the steel ball to rotate on the second shell. When the steel ball rolls to the return groove, the spring pushes the spring seat to move, and the spring seat pushes the steel ball, so that the steel ball partially enters the return groove, so as to Figure 3 For example, when the cradle is in a horizontal state, positioning and limiting are completed to prevent the cradle from rotating due to vibration and causing oil leakage in the hydraulic pump.

[0034] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned utility model concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form a technical solution.

Claims

1. A hydraulic pump with precise positioning, characterized in that: The invention comprises a first shell (1), a first through hole (2) fixedly arranged on the first shell, a first cavity (3) fixedly arranged on the first shell, a second through hole (4) fixedly arranged on the first shell, a positioning mechanism (5) rotatably arranged in the first cavity and passing through the second through hole, a second shell (6) fixedly arranged on the first shell, a third through hole (7) fixedly arranged on the second shell, a driving mechanism (8) fixedly arranged on the first shell and the second shell, and a connecting mechanism (9) fixedly arranged on the second shell.

2. A hydraulic pump with precise positioning according to claim 1, characterized in that: The driving mechanism comprises a first bearing (81) fixedly arranged on the first housing, a first sealing assembly (82) fixedly arranged on the first housing, and a driving shaft (83) rotatably penetrating the first through hole and the third through hole and penetrating the first bearing and the first sealing assembly.

3. A hydraulic pump with precise positioning according to claim 2, characterized in that: The first sealing assembly comprises a first sealing ring (821) fixedly arranged on the first housing, and a first elastic ring (822) fixedly arranged on the first sealing ring.

4. The hydraulic pump with precise positioning according to claim 1, characterized in that: The communication mechanism comprises a first oil inlet (91) fixedly arranged on the second housing, an oil inlet pipeline (92) fixedly arranged on the second housing, a second oil inlet (93) fixedly arranged on the second housing, a first oil outlet (94) fixedly arranged on the second housing, an oil outlet pipeline (95) fixedly arranged on the second housing, and a second oil outlet (96) fixedly arranged on the second housing.

5. The hydraulic pump with precise positioning according to claim 1, characterized in that: The positioning mechanism comprises a cradle (51) rotatably penetrating the first cavity and rotatably penetrating the second through hole, a fourth through hole (52) fixedly arranged on the cradle, an ear shaft (53) fixedly arranged on the first shell, a second sealing ring (54) fixedly arranged on the first shell, a limiting assembly (55) fixedly arranged on the ear shaft and the cradle, and a second elastic ring (56) fixedly arranged on the second sealing ring.

6. The hydraulic pump with precise positioning according to claim 5, characterized in that: The limiting assembly comprises a mounting groove (551) fixedly arranged on the cradle, a return groove (552) fixedly arranged on the ear shaft, a spring seat (553) slidably arranged on the mounting groove, a spring (554) with one end fixedly arranged on the cradle and the other end fixedly arranged on the spring seat, and a steel ball (555) slidably arranged on the mounting groove.

Images