Forklift pump

Abstract

A pump body of the forklift pump is provided with an oil suction port, a pressure port and a middle oil cavity, a cut angle between the oil suction port and an inner cavity of the pump body is a first preset angle, a cut angle between the pressure port and the inner cavity of the pump body is a second preset angle, and a cut angle between the middle oil cavity and the inner cavity of the pump body is a third preset angle. An inner gear ring is arranged in the pump body, a gear shaft is arranged in the inner gear ring, and the center distance between the inner gear ring and a gear pair of the gear shaft is a preset distance. Therefore, on one hand, the stress of the gear shaft is more balanced in the operation process, a good balanced state is obtained, oil film lubrication in the balanced state is more easily formed between the pump body and the inner gear ring, mechanical abrasion caused by uneven stress is avoided, on the other hand, the inner gear ring and the gear shaft reach the optimal meshing state in the operation process, and the service life of the pump body is prolonged. And the flow pulsation and the pressure pulsation of the forklift pump and the noise of the forklift pump in operation are reduced, so that the service life of the forklift pump is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the field of mechanical engineering, and particularly relates to a forklift pump. Background Art

[0002] As an important material handling equipment, forklifts play an indispensable role in the warehousing and logistics industry. The hydraulic system of a forklift is one of its key components, and the forklift pump, as the heart of the hydraulic system, directly affects the performance and efficiency of the forklift. Traditional forklift pumps have some defects in design, especially in terms of hydrodynamic characteristics and mechanical structure, which limit the service life and working efficiency of the forklift pump.

[0003] Existing forklift pumps usually include a pump body, which is provided with basic structures such as an oil suction port, a pressure port, and an oil cavity for sucking and discharging oil. However, the geometric shapes and relative positions of these structures often fail to achieve the optimal design, resulting in unstable oil flow in the pump body, generating unnecessary turbulence and vortices, increasing the energy consumption and noise of the pump, and possibly causing premature wear of the internal components of the pump body.

[0004] In addition, there are also limitations in the design of the gear pair inside the pump body, that is, the fit between the internal gear ring and the gear shaft. Due to the inaccurate center distance of the gear pair or the unreasonable meshing angle of the gears, the gear pair is prone to unbalanced vibration during high-speed operation, further exacerbating the mechanical wear and noise problems, and reducing the reliability and working life of the forklift pump. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems in the above technologies to a certain extent.

[0006] To this end, an object of the utility model is to propose a forklift pump. By optimizing the cut angles of the oil suction port, the pressure port, and the intermediate oil cavity with the inner cavity of the pump body and the center distance of the gear pair between the internal gear ring and the gear shaft, on the one hand, the force on the gear shaft during operation is more balanced, obtaining a good balance state, making it easier to form an oil film lubrication in a balanced state between the pump body and the internal gear ring, avoiding mechanical wear caused by uneven force, and on the other hand, enabling the internal gear ring and the gear shaft to reach the optimal meshing state during operation, reducing the flow pulsation and pressure pulsation of the forklift pump, as well as the noise during the operation of the forklift pump, and greatly extending the service life of the forklift pump.

[0007] To achieve the above object, a first aspect embodiment of the utility model proposes a forklift pump. The pump body of the forklift pump is provided with an oil suction port, a pressure port, and an intermediate oil cavity, wherein,

[0008] The chamfer angle between the oil suction port and the inner cavity of the pump body is a first preset angle, the chamfer angle between the pressure port and the inner cavity of the pump body is a second preset angle, and the chamfer angle between the intermediate oil cavity and the inner cavity of the pump body is a third preset angle;

[0009] An internal gear ring is arranged inside the pump body, a gear shaft is arranged inside the internal gear ring, the gear shaft and the internal gear ring are eccentrically arranged, and the gear of the gear shaft meshes with the gear of the internal gear ring;

[0010] The center distance between the internal gear ring and the gear of the gear shaft is a preset distance.

[0011] According to the forklift pump of the embodiment of the present invention, by optimizing the chamfer angles between the oil suction port, the pressure port, the intermediate oil cavity and the inner cavity of the pump body and the center distance between the internal gear ring and the gear of the gear shaft, on the one hand, the force on the gear shaft during operation is more balanced, a good balanced state is obtained, and it is easier to form an oil film lubrication in a balanced state between the pump body and the internal gear ring, avoiding mechanical wear caused by uneven force. On the other hand, the internal gear ring and the gear shaft reach the optimal meshing state during operation, reducing the flow pulsation and pressure pulsation of the forklift pump, as well as the noise during the operation of the forklift pump, and greatly extending the service life of the forklift pump.

[0012] In addition, the forklift pump proposed according to the above embodiment of the present invention may further have the following additional technical features:

[0013] In an embodiment of the present invention, the first preset angle is 115°, the second preset angle is 103°, the third preset angle is 138°, and the preset distance is 8.8.

[0014] In an embodiment of the present invention, a crescent plate, a crescent sub-plate and a positioning rod are further arranged inside the pump body, and the crescent plate, the crescent sub-plate, the positioning rod, the internal gear ring and the gear shaft are linked to make the oil flow inside the pump body;

[0015] A plastic rod and a leaf spring are arranged inside the groove of the crescent plate.

[0016] In an embodiment of the present invention, a front side plate and a rear side plate are further arranged inside the pump body, the internal gear ring, the gear shaft, the crescent plate, the crescent sub-plate and the positioning rod are respectively arranged between the front side plate and the rear side plate, both ends of the positioning rod respectively penetrate through the front side plate and the rear side plate, and both ends of the gear shaft respectively penetrate through the front side plate and the rear side plate.

[0017] In an embodiment of the present utility model, front covers and rear covers are respectively arranged at both ends of the pump body. A connecting flange is arranged on a surface of the front cover away from the pump body, and a skeleton oil seal and a snap ring for hole are arranged inside the front cover.

[0018] In an embodiment of the present utility model, one end of the gear shaft is inserted into the inside of the rear cover, and the other end of the gear shaft penetrates through the front cover, the skeleton oil seal, the snap ring for hole and the connecting flange. Sliding bearings are respectively arranged at the joints of the gear shaft with the front cover and the rear cover.

[0019] In an embodiment of the present utility model, the connecting flange, the front cover, the pump body and the rear cover are connected through screws penetrating through.

[0020] In an embodiment of the present utility model, a flat key is arranged at one end of the gear shaft.

[0021] Additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0022] The above-mentioned and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0023] Figure 1 is a schematic structural diagram of a forklift pump according to an embodiment of the present utility model Figure 1 ;

[0024] Figure 2 is a schematic structural diagram of a forklift pump according to an embodiment of the present utility model Figure 2 ;

[0025] Figure 3 is a cross-section of a forklift pump according to an embodiment of the present utility model Figure 1 ;

[0026] Figure 4 is a cross-section of a forklift pump according to an embodiment of the present utility model Figure 2 ;

[0027] As shown in the figure:

[0028] 1 - pump body, 2 - oil suction port, 3 - pressure port, 4 - intermediate oil cavity, 5 - internal gear ring, 6 - gear shaft, 7 - crescent plate, 8 - crescent sub - plate, 9 - positioning rod, 10 - front side plate, 11 - rear side plate, 12 - front cover, 13 - rear cover, 14 - connecting flange, 15 - skeleton oil seal, 16 - snap ring for hole, 17 - sliding bearing. Detailed Embodiments

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0030] The forklift pump according to the embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0031] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, a forklift pump, the pump body 1 of the forklift pump is provided with an oil suction port 2, a pressure port 3 and an intermediate oil cavity 4. Among them,

[0032] The chamfer angle between the oil suction port 2 and the inner cavity of the pump body 1 is a first preset angle, specifically 115°;

[0033] The chamfer angle between the pressure port 3 and the inner cavity of the pump body 1 is a second preset angle, specifically 103°;

[0034] The chamfer angle between the intermediate oil cavity 4 and the inner cavity of the pump body 1 is a third preset angle, specifically 138°;

[0035] The inside of the pump body 1 is provided with an internal gear ring 5, a crescent plate 7, a crescent sub-plate 8, a positioning rod 9, a front side plate 10 and a rear side plate 11;

[0036] The inside of the internal gear ring 5 is provided with a gear shaft 6. The gear shaft 6 and the internal gear ring 5 are eccentrically arranged, and the gear of the gear shaft 6 meshes with the gear of the internal gear ring 5;

[0037] The center distance of the gear pair of the internal gear ring 5 and the gear shaft 6 is a preset distance, specifically 8.8.

[0038] The crescent plate 7, the crescent sub-plate 8, the positioning rod 9, the internal gear ring 5 and the gear shaft 6 are linked to make the oil flow inside the pump body 1.

[0039] The inside of the groove of the crescent plate 7 is provided with a plastic rod and a leaf spring.

[0040] The internal gear ring 5, the gear shaft 6, the crescent plate 7, the crescent sub-plate 8 and the positioning rod 9 are respectively arranged between the front side plate 10 and the rear side plate 11. The two ends of the positioning rod 9 respectively penetrate through the front side plate 10 and the rear side plate 11, and the two ends of the gear shaft 6 respectively penetrate through the front side plate 10 and the rear side plate 11.

[0041] Both ends of the pump body 1 are respectively provided with a front cover 12 and a rear cover 13. A connecting flange 14 is provided on the surface of the front cover 12 away from the pump body 1. The inside of the front cover 12 is provided with a skeleton oil seal 15 and a hole retaining snap ring 16.

[0042] One end of the gear shaft 6 is inserted into the rear cover 13, and the other end of the gear shaft 6 passes through the front cover 12, the skeleton oil seal 15, the hole elastic ring 16 and the connecting flange 14. Sliding bearings 17 are respectively provided at the connection between the gear shaft 6 and the front cover 12 and the rear cover 13.

[0043] The connecting flange 14, the front cover 12, the pump body 1 and the rear cover 13 are connected through screws.

[0044] One end of the gear shaft 6 is provided with a flat key.

[0045] Specifically, the cutting angle between the oil suction port 2 and the inner cavity of the pump body 1 is 115°, which can ensure that the oil can flow smoothly into the interior of the pump body 1 without generating additional resistance or eddy current due to an inappropriate angle;

[0046] The cut angle of the pressure port 3 and the inner cavity of the pump body 1 is 103°, which can reduce the resistance generated when the oil is discharged from the inside of the pump body 1, ensuring that the oil can flow out of the inside of the pump body 1 smoothly;

[0047] The cutting angle of the middle oil cavity 4 and the inner cavity of the pump body 1 is 138°, which is conducive to maintaining the stable flow of oil in the pump body 1. A stable oil film is easily generated between the inner gear ring 5 and the inner cavity of the pump body 1, so that the inner gear ring 5 and the pump body 1 are balanced in force, and the lubrication state is good, which greatly reduces the mechanical wear during operation, and also reduces the noise of the forklift pump during operation, and prolongs the service life of the forklift pump;

[0048] The gears of the inner gear ring 5 and the gear shaft 6 are designed with appropriate displacement, and the center distance of the gear pair is adjusted to 8.8. This not only avoids the common interference problem of low-tooth-number gears, but also significantly improves the overlap during meshing. The increase in overlap optimizes the stability and efficiency of the gear pair during the transmission process, thereby significantly enhancing the strength and bearing capacity of the inner gear ring 5 and the gear shaft 6.

[0049] The displacement of the gears of the inner gear ring 5 and the gear shaft 6 also improves the wear resistance of the gear meshing, prolongs the life of the gears, optimizes the contact mode of the gear meshing, reduces the impact and noise during the transmission process, and reduces the pressure pulsation and noise during the operation of the forklift pump.

[0050] In summary, by optimizing the cutting angles of the oil suction port 2, the pressure port 3 and the intermediate oil chamber 4 with the inner cavity of the pump body 1 and the distance between the inner gear ring 5 and the gear pair of the gear shaft 6, on the one hand, the force on the gear shaft 6 is more balanced during operation, and a good balance state is obtained, so that it is easier to form a balanced oil film lubrication between the pump body 1 and the inner gear ring 5, thereby avoiding mechanical wear caused by uneven force. On the other hand, the inner gear ring 5 and the gear shaft 6 reach the optimal meshing state during operation, reducing the flow pulsation and pressure pulsation of the forklift pump, as well as the noise of the forklift pump during operation, thereby greatly extending the life of the forklift pump.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A forklift pump, characterized in that, The pump body (1) of the forklift pump is provided with an oil suction port (2), a pressure port (3) and an intermediate oil cavity (4), wherein, The cut angle between the oil suction port (2) and the inner cavity of the pump body (1) is a first preset angle, the cut angle between the pressure port (3) and the inner cavity of the pump body (1) is a second preset angle, and the cut angle between the intermediate oil cavity (4) and the inner cavity of the pump body (1) is a third preset angle; An internal gear ring (5) is arranged inside the pump body (1), a gear shaft (6) is arranged inside the internal gear ring (5), the gear shaft (6) and the internal gear ring (5) are eccentrically arranged, and the gear of the gear shaft (6) meshes with the gear of the internal gear ring (5); The center distance of the gear pair of the internal gear ring (5) and the gear shaft (6) is a preset distance.

2. The forklift pump according to claim 1, characterized in that, The first preset angle is 115°, the second preset angle is 103°, the third preset angle is 138°, and the preset distance is 8.

8.

3. The forklift pump according to claim 2, wherein An internal crescent plate (7), a crescent sub-plate (8) and a positioning rod (9) are further arranged inside the pump body (1), and the crescent plate (7), the crescent sub-plate (8), the positioning rod (9), the internal gear ring (5) and the gear shaft (6) are linked to enable the oil to flow inside the pump body (1); A plastic rod and a leaf spring are arranged inside the groove of the crescent plate (7).

4. The forklift pump according to claim 3, characterized in that A front side plate (10) and a rear side plate (11) are further arranged inside the pump body (1), the internal gear ring (5), the gear shaft (6), the crescent plate (7), the crescent sub-plate (8) and the positioning rod (9) are respectively arranged between the front side plate (10) and the rear side plate (11), both ends of the positioning rod (9) respectively penetrate through the front side plate (10) and the rear side plate (11), and both ends of the gear shaft (6) respectively penetrate through the front side plate (10) and the rear side plate (11).

5. The forklift pump according to claim 4, characterized in that, A front cover (12) and a rear cover (13) are respectively arranged at both ends of the pump body (1), a connecting flange (14) is arranged on the surface of the front cover (12) far away from the pump body (1), and a skeleton oil seal (15) and a hole-use snap ring (16) are arranged inside the front cover (12).

6. The forklift pump according to claim 5, characterized in that, One end of the gear shaft (6) is inserted inside the rear cover (13), the other end of the gear shaft (6) penetrates through the front cover (12), the skeleton oil seal (15), the hole-use snap ring (16) and the connecting flange (14), and sliding bearings (17) are respectively arranged at the connection positions of the gear shaft (6) and the front cover (12) and the rear cover (13).

7. The forklift pump according to claim 6, characterized in that, The connecting flange (14), the front cover (12), the pump body (1) and the rear cover (13) are connected through screws penetrating through.

8. The forklift pump according to claim 7, characterized in that, A flat key is arranged at one end of the gear shaft (6).

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