Hydraulic pump anti-vacuum device and tractor hydraulic pump mounting structure

Abstract

The utility model provides a kind of hydraulic pump anti-suction empty device and tractor hydraulic pump mounting structure, and hydraulic pump anti-suction empty device includes: oil tank, its inside is equipped with oil storage cavity;Oil suction pipe, it is fixed on the oil tank, and the lower end of oil suction pipe is equipped with the first joint that can be used to connect external oil supplement device;External oil outlet pipe, it is fixed on the lower side of the oil tank, and the upper end of external oil outlet pipe is lower than the upper end of the oil suction pipe, and the lower end of external oil outlet pipe is equipped with the second joint that can be used to connect external hydraulic pump;The upper end of the oil suction pipe and the upper end of external oil outlet pipe are all communicated with the oil storage cavity.Using the utility model, oil liquid in oil tank interior can always immerse the upper end of external oil outlet pipe, when external oil supplement device is not stable to the oil supply of external oil outlet pipe, and oil liquid in oil tank interior guarantees the normal oil suction of hydraulic pump, effectively avoids the condition of pump suction empty, and the working performance of hydraulic pump is reliable.

Description

Technical Field

[0001] This utility model relates to the technical field of tractor oil suction devices, specifically to a hydraulic pump anti-air suction device and a tractor hydraulic pump mounting structure. Background Technology

[0002] Tractors, as a type of conventional agricultural machinery, play an indispensable role in agricultural production and road transportation, and the hydraulic system is a key component of the tractor. The prerequisite for the normal operation of the hydraulic system is the reliable oil suction performance of its core component, the hydraulic pump.

[0003] In most existing tractor systems, the hydraulic pump is mounted on the side of the gearbox. This requires accommodating not only the hydraulic pump itself but also the suction filter at the pump inlet and even a make-up pump, resulting in a large space requirement and difficult installation. To effectively utilize the limited space in the tractor, the hydraulic pump is sometimes mounted above the gearbox. However, in this case, the product lacks an anti-cavitation structure, making it prone to pump cavitation during operation, especially during startup. The hydraulic pump draws oil directly from the suction filter, and the make-up pump's oil supply to the filter is unstable, further increasing the likelihood of cavitation. Cavitation severely affects the hydraulic pump's performance and causes frequent abnormal noises, impacting the overall user experience. Therefore, a structure is needed to prevent hydraulic pump cavitation. Utility Model Content

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] This utility model provides a hydraulic pump anti-cavitation device, comprising:

[0006] The fuel tank has an internal fuel storage cavity.

[0007] An oil suction pipe is fixed to the oil tank, and the lower end of the oil suction pipe is provided with a first connector for connecting an external oil replenishment device; an external oil delivery pipe is fixed to the lower side of the oil tank, the upper end of the external oil delivery pipe is lower than the upper end of the oil suction pipe, and the lower end of the external oil delivery pipe is provided with a second connector for connecting an external hydraulic pump.

[0008] The upper end of the oil suction pipe and the upper end of the external oil delivery pipe are both connected to the oil storage cavity.

[0009] The beneficial effects of this utility model are:

[0010] This invention employs a design where the upper end of the external oil supply pipe is lower than the upper end of the oil suction pipe, ensuring that the oil in the tank always submerges the upper end of the external oil supply pipe. When the oil supply from the external oil replenishment device to the external oil supply pipe is unstable, the oil in the tank guarantees normal oil suction by the hydraulic pump, providing a buffer time for the external oil replenishment device to stabilize its supply. This effectively prevents the pump from cavitating, ensuring reliable hydraulic pump performance, avoiding frequent abnormal noises, and improving the overall vehicle comfort. Furthermore, the first connector at the lower end of the oil suction pipe connects to the oil suction filter of the external oil replenishment device, and the second connector at the lower end of the external oil supply pipe connects to the external hydraulic pump. This allows the external hydraulic pump, oil suction filter, and other structures to be fixed to the upper side of the gearbox, occupying minimal space and facilitating installation.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, a breathing tube is fixed to the oil tank, and the upper end of the breathing tube is connected to the upper part of the oil storage cavity.

[0013] During installation, the lower end of the breather tube is connected to the gearbox housing via a rubber hose. When a vacuum or excessive pressure occurs inside the fuel tank, the vacuum or pressure can be released through the breather tube to prevent the fuel tank from deforming and failing due to pressure.

[0014] Furthermore, the upper end of the breathing tube is higher than the upper end of the oil suction tube.

[0015] To prevent oil from splashing from the upper end of the suction tube onto the upper end of the breathing tube, it is important to keep the breathing tube unobstructed.

[0016] Furthermore, both the oil suction pipe and the breather pipe are fixed to the lower side of the oil tank, and the upper ends of the oil suction pipe and the breather pipe extend vertically upward into the oil storage cavity.

[0017] It occupies little space and is easy to install; at the same time, when there is a lot of oil in the tank, it avoids the oil from submerging the upper end of the breather tube and ensuring the effective volume of the tank.

[0018] Furthermore, the oil tank is arranged at an angle, with the breather pipe fixed to the upper part of the lower side of the oil tank, the oil suction pipe fixed to the middle part of the lower side of the oil tank, and the external oil delivery pipe fixed to the lowest point of the lower side of the oil tank.

[0019] Even when the amount of oil inside the tank is low, it can still submerge the upper end of the external oil delivery pipe. At the same time, it avoids the upper part of the oil suction pipe and breather pipe occupying the space in the lower part of the oil storage cavity, thus ensuring the effective volume of the oil tank.

[0020] Furthermore, the oil tank is cylindrical, with a tapered narrowing section at the lower end, and the external oil pipe is fixed to the tapered surface of the narrowing section.

[0021] This facilitates reducing the width of the bottom liquid level in the oil storage cavity, allowing the oil to fully enter the external oil pipeline.

[0022] Furthermore, the lower end of the breathing tube is provided with a first expansion joint.

[0023] The venting hose can be fitted onto the first expansion joint, making installation convenient and providing a good seal.

[0024] Furthermore, a second expansion joint is provided on the first joint.

[0025] When installing an external oil replenishment device, the hose of the oil replenishment device can be sleeved onto the second expansion joint, which is convenient to install and has good sealing performance.

[0026] Furthermore, the second connector is a flange.

[0027] It connects to an external hydraulic pump via a flange, making installation convenient. It is also strong enough to support the weight of the oil tank and has good sealing performance.

[0028] This utility model also provides a tractor hydraulic pump mounting structure, including a gearbox, a replenishing pump, a suction filter, a hydraulic pump, and a device to prevent air suction of the hydraulic pump. The inlet of the replenishing pump is connected to the gearbox, the outlet of the replenishing pump is connected to the inlet of the suction filter, and the outlet of the suction filter is connected to a first connector. The inlet of the hydraulic pump is connected to a second connector. The suction filter, the hydraulic pump, and the oil tank are all fixed on the gearbox.

[0029] When the oil supply from the replenishing pump to the external oil pipe is unstable, the oil inside the tank ensures the normal oil suction of the hydraulic pump, providing a buffer time for the stability of the replenishing pump, effectively avoiding pump cavitation, ensuring reliable hydraulic pump performance, avoiding frequent abnormal noises, and improving the overall vehicle comfort; it also allows external hydraulic pumps, oil suction filters, and other structures to be fixed on the upper side of the gearbox, occupying little space and making installation convenient. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 for Figure 1 Top view.

[0032] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0033] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0034] 1-Fuel tank; 2-Suction pipe; 3-External oil pipe; 4-First connector; 5-Second connector; 6-Breathing pipe; 7-Contraction section; 8-First expansion joint. Detailed Implementation

[0035] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0036] This utility model refers to Figure 1-3 .

[0037] This utility model provides a hydraulic pump anti-cavitation device, comprising:

[0038] Fuel tank 1, which has an internal oil storage cavity;

[0039] The oil suction pipe 2 is fixed to the oil tank 1, and the lower end of the oil suction pipe 2 is provided with a first connector 4 that can be used to connect an external oil replenishment device.

[0040] An external oil pipe 3 is fixed to the lower side of the oil tank 1. The upper end of the external oil pipe 3 is lower than the upper end of the oil suction pipe 2. The lower end of the external oil pipe 3 is provided with a second connector 5 that can be used to connect an external hydraulic pump.

[0041] The upper end of the oil suction pipe 2 and the upper end of the external oil delivery pipe 3 are both connected to the oil storage cavity.

[0042] When installing the hydraulic pump anti-cavitation device of this utility model, the first connector 4 at the lower end of the oil suction pipe 2 is fixedly connected to the outlet of the oil suction filter of the external oil replenishment device, and the second connector 5 at the lower end of the external oil delivery pipe 3 is fixedly connected to the inlet of the external hydraulic pump. The external hydraulic pump is fixed on the upper side of the gearbox, and the oil tank 1 can be supported and fixed above the gearbox by the hydraulic pump and the external oil replenishment device. In the external oil replenishment device, the inlet of its oil suction filter is connected to an oil replenishment pump, and the inlet of the oil replenishment pump is connected to the gearbox.

[0043] During operation, the hydraulic oil output by the replenishing pump is sent into the oil tank 1 through the suction filter. The hydraulic oil in the oil tank 1 submerges the space at the upper end of the external oil delivery pipe 3, allowing the external hydraulic pump to draw hydraulic oil from the oil tank 1 through the external oil delivery pipe 3. When the machine is stopped and the engine is turned off, a small amount of oil remains in the oil tank 1, enough to submerge the space at the upper end of the external oil delivery pipe 3, ensuring that the hydraulic pump can still draw oil normally when the machine is restarted, preventing cavitation. Once the replenishing pump's operating state stabilizes, the oil level in the oil tank 1 reaches dynamic equilibrium. Compared to the hydraulic pump drawing oil directly from the suction filter, this invention provides the buffer time required for the replenishing pump's operating state to gradually stabilize, ensuring that the hydraulic pump draws oil normally when the tractor starts.

[0044] By employing this invention, the upper end of the external oil supply pipe 3 is lower than the upper end of the oil suction pipe 2, ensuring that the oil inside the oil tank 1 always submerges the upper end of the external oil supply pipe 3. When the oil supply from the external oil replenishment device to the external oil supply pipe 3 is unstable, the oil inside the oil tank 1 guarantees the normal oil suction of the hydraulic pump, providing a buffer time for the stable oil supply from the external oil replenishment device, effectively preventing pump cavitation, ensuring reliable hydraulic pump performance, avoiding frequent abnormal noises, and improving the overall vehicle comfort. Simultaneously, the first connector 4 at the lower end of the oil suction pipe 2 connects to the oil suction filter of the external oil replenishment device, and the second connector 5 at the lower end of the external oil supply pipe 3 connects to the external hydraulic pump. This allows the external hydraulic pump, oil suction filter, and other structures to be fixed on the upper side of the gearbox, occupying little space and facilitating installation.

[0045] Furthermore, a breathing tube 6 is also fixed on the oil tank 1, and the upper end of the breathing tube 6 is connected to the upper part of the oil storage cavity.

[0046] During installation, the lower end of the breather tube 6 is connected to the gearbox housing via a rubber hose. When a vacuum or excessive pressure occurs inside the oil tank 1, the vacuum or pressure can be released through the breather tube 6 to prevent the oil tank 1 from deforming and failing due to pressure.

[0047] Furthermore, the upper end of the breathing tube 6 is higher than the upper end of the oil suction tube 2.

[0048] To prevent oil from splashing from the upper end of the suction tube 2 onto the upper end of the breathing tube 6, and to keep the breathing tube 6 unobstructed.

[0049] Furthermore, the oil suction pipe 2 and the breathing pipe 6 are both fixed to the lower side of the oil tank 1, and the upper ends of the oil suction pipe 2 and the breathing pipe 6 extend vertically upward into the oil storage cavity.

[0050] It occupies little space and is easy to install; at the same time, when there is a lot of oil in the oil tank 1, it avoids the oil from submerging the upper end of the breathing tube 6 and the upper end of the breathing tube 6, thus ensuring the effective volume of the oil tank 1.

[0051] Furthermore, the oil tank 1 is arranged at an angle, the breathing pipe 6 is fixed to the upper part of the lower side of the oil tank 1, the oil suction pipe 2 is fixed to the middle part of the lower side of the oil tank 1, and the external oil delivery pipe 3 is fixed to the lowest point of the lower side of the oil tank 1.

[0052] When the amount of oil inside the oil tank 1 is low, it can still submerge the upper end of the external oil delivery pipe 3. At the same time, it avoids the upper part of the oil suction pipe 2 and the breather pipe 6 occupying the space in the lower part of the oil storage cavity, thus ensuring the effective volume of the oil tank 1.

[0053] Furthermore, the oil tank 1 is cylindrical, and the lower end of the oil tank 1 is provided with a conical narrowing section 7, and the external oil pipe 3 is fixed to the conical surface of the narrowing section 7.

[0054] This facilitates reducing the width of the bottom liquid level in the oil storage cavity, allowing the oil to fully enter the external oil pipeline 3.

[0055] Furthermore, the lower end of the breathing tube 6 is provided with a first expansion joint 8.

[0056] Note: An expansion joint is formed by expanding the pipe inside, causing one or more annular bulges to form outward on the pipe wall.

[0057] The ventilated hose can be fitted onto the first expansion joint 8, which is easy to install and has good sealing performance.

[0058] Furthermore, a second expansion joint is provided on the first connector 4.

[0059] When installing an external oil replenishment device, the hose of the oil replenishment device can be sleeved onto the second expansion joint, which is convenient to install and has good sealing performance.

[0060] Furthermore, the second connector 5 is a flange.

[0061] It connects to an external hydraulic pump via a flange, making installation convenient. It is also strong enough to support the weight of the oil tank and has good sealing performance.

[0062] This utility model also provides a tractor hydraulic pump mounting structure, including a gearbox, a replenishing pump, a suction filter, a hydraulic pump, and a device to prevent the hydraulic pump from sucking air. The inlet of the replenishing pump is connected to the gearbox, the outlet of the replenishing pump is connected to the inlet of the suction filter, and the outlet of the suction filter is connected to the first connector 4. The inlet of the hydraulic pump is connected to the second connector 5. The suction filter, the hydraulic pump, and the oil tank 1 are all fixed on the gearbox.

[0063] When the oil supply from the replenishing pump to the external oil pipe 3 is unstable, the oil inside the oil tank 1 ensures the normal oil suction of the hydraulic pump, providing a buffer time for the stability of the replenishing pump, effectively avoiding pump cavitation, ensuring reliable hydraulic pump performance, avoiding frequent abnormal noises, and improving the overall vehicle comfort; it also allows external hydraulic pumps, oil suction filters, and other structures to be fixed on the upper side of the gearbox, occupying little space and making installation convenient.

[0064] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0065] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0067] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0068] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A hydraulic pump anti-cavitation device, characterized in that: include: The fuel tank (1) has an internal oil storage cavity; The oil suction pipe (2) is fixed to the oil tank (1), and the lower end of the oil suction pipe (2) is provided with a first connector (4) that can be used to connect an external oil replenishment device; An external oil pipe (3) is fixed to the lower side of the oil tank (1). The upper end of the external oil pipe (3) is lower than the upper end of the oil suction pipe (2). The lower end of the external oil pipe (3) is provided with a second connector (5) that can be used to connect an external hydraulic pump. The upper end of the oil suction pipe (2) and the upper end of the external oil delivery pipe (3) are both connected to the oil storage cavity.

2. The hydraulic pump anti-cavitation device according to claim 1, characterized in that: A breathing tube (6) is also fixed on the oil tank (1), and the upper end of the breathing tube (6) is connected to the upper part of the oil storage cavity.

3. The hydraulic pump anti-cavitation device according to claim 2, characterized in that: The upper end of the breathing tube (6) is higher than the upper end of the oil suction tube (2).

4. The hydraulic pump anti-cavitation device according to claim 3, characterized in that: The oil suction pipe (2) and the breathing pipe (6) are both fixed to the lower side of the oil tank (1), and the upper end of the oil suction pipe (2) and the upper end of the breathing pipe (6) extend vertically upward into the oil storage cavity.

5. The hydraulic pump anti-cavitation device according to claim 4, characterized in that: The oil tank (1) is arranged at an angle, the breathing pipe (6) is fixed to the upper part of the lower side of the oil tank (1), the oil suction pipe (2) is fixed to the middle part of the lower side of the oil tank (1), and the external oil delivery pipe (3) is fixed to the lowest point of the lower side of the oil tank (1).

6. The hydraulic pump anti-cavitation device according to claim 5, characterized in that: The oil tank (1) is cylindrical, and the lower end of the oil tank (1) is provided with a conical narrowing section (7), and the external oil pipe (3) is fixed on the conical surface of the narrowing section (7).

7. The hydraulic pump anti-cavitation device according to claim 2, characterized in that: The lower end of the breathing tube (6) is provided with a first expansion joint (8).

8. The hydraulic pump anti-cavitation device according to any one of claims 1-7, characterized in that: The first joint (4) is provided with a second expansion joint.

9. The hydraulic pump anti-cavitation device according to any one of claims 1-7, characterized in that: The second connector (5) is a flange.

10. A mounting structure for a tractor hydraulic pump, characterized in that: The system includes a gearbox, a replenishing pump, a suction filter, a hydraulic pump, and a hydraulic pump anti-cavitation device as described in any one of claims 1-9. The inlet of the replenishing pump is connected to the gearbox, the outlet of the replenishing pump is connected to the inlet of the suction filter, and the outlet of the suction filter is connected to the first connector (4). The inlet of the hydraulic pump is connected to the second connector (5). The suction filter, the hydraulic pump, and the oil tank (1) are all fixed on the gearbox.

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