Gear pump

Abstract

The utility model relates to a gear pump which comprises a pump body, an 8-shaped working cavity is arranged in the pump body along a first direction, the working cavity is symmetrical about a first plane, a spigot is arranged in the working cavity, the pump body further comprises an oil outlet, and an unloading groove is further arranged at the position adjacent to the spigot and the oil outlet along the surface of the working cavity. The unloading groove is formed in the oil outlet in the working cavity of the pump body in the radial direction, the oil cavity close to the end of the oil outlet is formed by the unloading groove and the gear teeth of the gear shaft, and therefore it is guaranteed that the impact resistance of the gear pump is improved, and noise of the gear pump is reduced; meanwhile, the impact influence caused by the fact that the interior of a working cavity of a traditional gear pump bears large pressure pulsation is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, and in particular to a gear pump. Background Technology

[0002] Gear pumps, as widely used power components in hydraulic systems, have many advantages such as small size, light weight, resistance to pollution, reliable operation, and convenient maintenance. Gear pumps form a sealed cavity through the cooperation of gears and figure-eight holes in the pump body, which isolates the oil inlet and outlet. After the gears rotate, the high and low pressure cavities change in volume, thereby realizing the oil inlet and outlet actions.

[0003] With the continuous development of the hydraulic industry, gear pumps are being used more widely in the field of construction machinery, and the market has placed higher demands on the lifespan and performance of gear pumps. Gear pumps typically unload through unloading grooves on the side plates to reduce noise, extend service life, and improve shock resistance. Alternatively, in existing applications, unloading grooves are created on the pump body, extending from the oil outlet to the top of the figure-eight hole in the pump body. This allows multiple sealed working chambers formed by the high-pressure side tooth tip circle and the pump body to be completely filled with high-pressure oil. However, this structure subjects the gear pump to significant pressure pulses, thus affecting its service life. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a gear pump to solve one or more problems in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A gear pump includes a pump body, wherein an “8”-shaped working chamber is provided in the pump body along a first direction, the working chamber is symmetrical about a first plane, a stop is provided in the working chamber, the pump body also includes an oil outlet, and an unloading groove is provided along the surface of the working chamber adjacent to the stop and the oil outlet.

[0007] Furthermore, the pump body also includes an oil inlet, and both the oil outlet and the oil inlet are located on the surface of the pump body and communicate with the working chamber.

[0008] Furthermore, the width of the unloading groove along the first direction is 3 to 6 mm, and the depth of the unloading groove projected onto the second direction at both ends is 2 to 4 mm.

[0009] Furthermore, the gear pump also includes a gear shaft assembly, which comprises two meshing gear shafts, and the gear shaft assembly is disposed in the working chamber and partially engages with the stop.

[0010] Furthermore, each gear shaft is provided with uniformly distributed gear teeth, and the gear teeth form a first included angle.

[0011] Furthermore, the gear shaft forms a second included angle with the two ends of the adjacent unloading groove.

[0012] Furthermore, the second included angle on each side of the first plane is 0.5 to 0.75 times the first included angle.

[0013] Furthermore, the unloading groove is arranged in an arc shape.

[0014] Furthermore, the gear pump also includes a side plate, which is fitted to the gear shaft assembly and disposed within the working cavity.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0016] The present invention provides a radially arranged unloading groove at the oil outlet of the pump body. By forming a chamber close to the end of the oil outlet with the gear shaft teeth, the present invention can improve the impact resistance of the gear pump and reduce the noise of the gear pump, while reducing the impact of pressure pulsation caused by the high pressure oil extending into the pump body in the radial unloading groove of the prior art. Attached Figure Description

[0017] Figure 1 This invention illustrates the structure of a gear pump according to an embodiment of the present invention. Figure I .

[0018] Figure 2 A cross-sectional view of the structure of a gear pump according to an embodiment of the present invention is shown. Figure I .

[0019] Figure 3 A cross-sectional view of the structure of a gear pump according to an embodiment of the present invention is shown. Figure II .

[0020] Figure 4 A cross-sectional view of the structure of a gear pump according to an embodiment of the present invention is shown. Figure III .

[0021] Figure 5 A cross-sectional view of the structure of a gear pump according to an embodiment of the present invention is shown. Figure IV .

[0022] The following labels are used in the attached diagram: 1. Pump body; 101. Working chamber; 102. Stop; 103. Oil outlet; 104. Oil inlet; 2. Unloading groove; 3. Gear shaft assembly; 4. Side plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the gear pump proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0024] Please see Figures 1 to 5 The gear pump of this embodiment includes a pump body 1. An "8"-shaped working chamber 101 is arranged within the pump body 1 along a first direction, which helps to provide a smooth fluid flow path and reduce fluid pulsation and noise. The working chamber 101 is symmetrical about a first plane. A stop 102 is provided within the working chamber 101. The pump body 1 also includes an oil outlet 103. An unloading groove 2 is also provided along the surface of the working chamber 101 adjacent to the stop 102 and the oil outlet 103. The unloading groove 2 is arc-shaped. The unloading groove 2 in this embodiment reduces wear on the gear end face, improves the efficiency and service life of the gear pump, and also avoids the working chamber 101 from being subjected to large pressure pulses while maintaining the original oil inlet and outlet effect. In this embodiment, the first direction is... Figure 4 The vertical direction shown is the length direction of the shaft of the gear set 3, and the first plane is a plane that includes the center line of the oil outlet 103 and the oil inlet 104 in this embodiment and is set along the first direction.

[0025] Furthermore, the unloading groove 2 has a width of 3-6 mm along the first direction, and the depth of the unloading groove 2 projected onto the second direction from both ends is 2-4 mm. In this embodiment, the second direction is the direction in which the center line of the oil outlet 103 forms. Since gear pumps have various displacement specifications and different sizes, this size varies. If the size is too small, it will not achieve the ideal unloading effect; if it is too large, the high-pressure oil will flow into the sealed working chamber 101 too quickly, causing the pump body 1 to be subjected to large pressure pulsation impacts.

[0026] Furthermore, the gear pump also includes a gear shaft assembly 3, which comprises two meshing gear shafts. Preferably, in this embodiment, the transmission ratio of the two gear shafts is set to 1:1. The gear shaft assembly 3 is disposed in the working chamber 101 and partially engages with the stop 102. Each gear shaft has uniformly distributed teeth, and the teeth form a first included angle such that... Figure 3 The first included angle, denoted as β, is determined based on the number of teeth on each gear shaft. The gear shafts respectively form a second included angle with the two ends of the adjacent unloading groove 2, as shown below. Figure 3 The figure shown is denoted as α.

[0027] Furthermore, the second included angle on each side of the first plane is 0.5 to 0.75 times the first included angle, that is, α:β is 0.5 to 0.75. The angle of β is 360° / number of gear teeth. By precisely controlling the ratio of the first included angle and the second included angle, the performance of the gear pump can be further optimized, such as improving flow stability and reducing leakage.

[0028] Furthermore, the gear pump also includes a side plate 4, which is fitted into the gear shaft assembly 3 and disposed within the working chamber 101. The side plate 4 is in contact with the end face of the gear teeth of the gear shaft assembly 3. The side plate 4 helps to enhance the structural strength of the pump body 1 and improve its overall stability and durability.

[0029] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A gear pump characterized by: The pump body is provided with a working cavity in the shape of "8" in the first direction, the working cavity is symmetrical about the first plane, a stop is arranged in the working cavity, the pump body further comprises an oil outlet, and an unloading groove is further arranged on the surface of the working cavity adjacent to the stop and the oil outlet; the pump body further comprises an oil inlet, the oil outlet and the oil inlet are both arranged on the surface of the pump body and communicate with the working cavity; the unloading groove has a width of 3-6mm in the first direction, and the depth of the unloading groove projected to the second direction at both ends is 2-4mm.

2. A gear pump as claimed in claim 1, characterized in that: The gear pump further comprises a gear shaft group, the gear shaft group comprises two gear shafts engaged with each other, and the gear shaft group is arranged in the working cavity and partially matched with the stop.

3. A gear pump as claimed in claim 2, characterized in that: The gear shafts are respectively provided with uniformly distributed gear teeth, and the gear teeth form a first included angle.

4. A gear pump as claimed in claim 3, characterized in that: The gear shafts respectively form a second included angle with the two ends of the adjacent unloading groove.

5. A gear pump as claimed in claim 4, characterised in that: The second included angle on each side of the first plane is 0.5-0.75 times of the first included angle.

6. A gear pump as claimed in claim 5, characterized in that: The unloading groove is arranged in an arc shape.

7. A gear pump as claimed in claim 6, characterized in that: The gear pump further comprises a side plate, and the side plate is arranged in the working cavity matched with the gear shaft group.

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