Oil supply system and vehicle

Abstract

The utility model discloses an oil supply system and a vehicle, and belongs to the technical field of oil pumps. The oil supply system comprises an oil tank used for storing oil; the pump gear is used for pumping medium oil; the reversing valve is used for controlling opening and closing of the oil return pipeline; the oil inlet pipeline is used for sequentially connecting the oil tank, the pump gear, the reversing valve and the oil cylinder; the oil outlet pipeline is used for connecting the oil cylinder with the reversing valve; and the oil return pipeline is used for connecting the reversing valve with the oil tank. Oil supply and oil return of the oil supply system can be realized through forward rotation and reverse rotation of the pump gear in cooperation with the reversing valve, and the pipeline structure is simpler; and an oil discharge valve is omitted, so that the cost of an oil supply system is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to an oil supply system and a vehicle. Background Art

[0002] The oil supply system is an important component of lifting and transport machinery such as forklifts. It is generally used to supply oil to and return oil to the cylinder. However, the piping structure of the existing oil supply system is complex and further improvement is necessary. Utility Model Content

[0003] The purpose of the utility model is to provide an oil supply system and a vehicle, which can reduce costs by improving the pipeline structure.

[0004] In a first aspect, an embodiment of the present application provides an oil supply system, comprising:

[0005] Oil tank, used for storing medium oil;

[0006] Pump gear, used for pumping medium oil;

[0007] Reversing valve, used to control the opening and closing of the oil return line;

[0008] The oil inlet pipeline is used to connect the oil tank, pump gear, reversing valve and oil cylinder in sequence;

[0009] The oil outlet pipeline is used to connect the oil cylinder and the reversing valve;

[0010] The oil return line is used to connect the reversing valve and the oil tank.

[0011] In some embodiments, the reversing valve includes a push rod located in the valve cavity, which can divide the valve cavity into three chambers; the oil inlet line is used to connect the oil tank, pump gear, the first chamber of the reversing valve and the oil cylinder in sequence; the oil outlet line is used to connect the oil cylinder and the second chamber of the reversing valve; the oil return line is used to connect the second chamber of the reversing valve and the oil tank.

[0012] In some embodiments, the reversing valve includes a push rod located in the valve cavity, and the push rod is capable of dividing the valve cavity into three chambers.

[0013] In some embodiments, the oil supply system further includes a valve opening pipeline for sequentially connecting the first chamber of the reversing valve, the pump gear, and the third chamber of the reversing valve.

[0014] In some embodiments, when the oil inlet line is open, the cylinder rod of the oil cylinder rises; when the oil return line is open, the cylinder rod of the oil cylinder descends.

[0015] In some embodiments, the oil supply system further includes an oil inlet one-way valve and an oil outlet one-way valve, wherein the oil inlet one-way valve is arranged upstream of the connection point between the valve opening pipeline and the oil inlet pipeline, and the oil outlet one-way valve is arranged between the reversing valve and the oil cylinder.

[0016] In some embodiments, the oil supply system includes a pump assembly, which includes a pump body, and a pump front cover and a pump rear cover that are cooperatively connected to both sides of the pump body; the pump gear and the reversing valve are integrated on the pump body, and part of the pipeline connecting the pump gear and the reversing valve is integrated on the pump assembly.

[0017] In some embodiments, a connecting shaft is passed through the pump front cover, and the connecting shaft is connected to the drive motor.

[0018] In some embodiments, a pressure-compensating valve is further provided on the return oil pipeline; and / or, the oil supply system also includes an overflow pipeline, one end of the overflow pipeline is connected to the pipeline between the pump gear and the oil outlet one-way valve, and the other end of the overflow pipeline is connected to the oil tank. An overflow one-way valve is provided on the overflow pipeline, and the overflow one-way valve opens after being subjected to a preset pressure, and the hydraulic oil can flow to the oil tank.

[0019] In some embodiments, a spare overflow port is provided on the valve opening pipeline.

[0020] In a second aspect, an embodiment of the present application further provides a vehicle comprising the aforementioned fuel supply system.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The oil supply system in the embodiment of the utility model can realize oil supply and return of the oil supply system through the forward and reverse rotation of the pump gear in conjunction with the reversing valve. The pipeline structure is simple. Compared with the prior art, the oil unloading valve is omitted, which greatly reduces the cost of the oil supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the oil supply system in the embodiment, where arrows indicate the flow direction of the hydraulic oil.

[0024] Figure 2 This is a structural diagram of the oil supply system in the embodiment in the open valve state, where the arrows indicate the flow direction of the hydraulic oil;

[0025] Figure 3 This is a structural diagram of the oil return state of the oil supply system in the embodiment, where the arrows in the figure indicate the flow direction of the hydraulic oil;

[0026] Figure 4 Schematic diagram of the pipeline of the oil supply system in the embodiment, in which the arrows indicate the flow direction of the hydraulic oil;

[0027] Figure 5 This is a schematic diagram of the pipeline of the oil supply system in the embodiment in the valve open state, and the arrows in the figure indicate the flow direction of the hydraulic oil;

[0028] Figure 6 This is a schematic diagram of the pipeline of the oil supply system in the oil return state in the embodiment, where the arrows in the figure indicate the flow direction of the hydraulic oil;

[0029] Figure 7 Schematic diagram of the structure of the oil supply system with an overflow pipeline in the embodiment;

[0030] The meanings of the reference numerals are as follows:

[0031] Oil tank 1, pump gear 2, connecting shaft 21, reversing valve 3, push rod 31, chamber 32, oil cylinder 4, oil inlet line 51, oil outlet line 52, valve opening line 53, oil return line 54, overflow line 55, oil inlet check valve 61, oil outlet check valve 62, overflow check valve 63, pump body 71, pump front cover 72, pump rear cover 73, spare overflow port 73a, pressure replenishment valve 81, plug 82. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The descriptions of ordinal numbers such as "first" and "second" involved in the background technology and embodiments are only for distinguishing the same or similar components, and cannot be used to limit the scope of protection of this application.

[0033] The oil inlet pipeline is used to connect the oil tank, pump gear, reversing valve and oil cylinder in sequence;

[0034] The oil outlet pipeline is used to connect the oil cylinder and the reversing valve;

[0035] The oil return line is used to connect the reversing valve and the oil tank.

[0036] like Figure 1-7As shown, an embodiment of the present application provides an oil supply system comprising an oil tank 1, a pump gear 2, a reversing valve 3, an oil cylinder 4, an oil inlet line 51, an oil outlet line 52, and an oil return line 54. The reversing valve 3 includes a push rod 31 located in a valve chamber, which divides the valve chamber into three chambers 32. When the push rod 31 is at the rightmost end, the volume of the first chamber 321 is minimized; when the push rod 31 is at the leftmost end, the volume of the third chamber 323 is minimized; the volume of the second chamber 322, located on the push rod 31, remains constant. The oil tank 1 stores medium oil. The pump gear 2 pumps the medium oil. The reversing valve 3 controls the opening and closing of the oil return line 54. The oil inlet line 51 sequentially connects the oil tank 1, the pump gear 2, the reversing valve 3, and the oil cylinder 4. Specifically, the oil inlet line 51 sequentially connects the oil tank 1, the pump gear 2, the first chamber 321 of the reversing valve 3, and the oil cylinder 4. The oil outlet line 52 is used to connect the oil cylinder 4 and the reversing valve 3; specifically, the oil outlet line 52 is used to connect the oil cylinder 4 and the second chamber 322 of the reversing valve 3. The oil return line 54 is used to connect the second chamber 322 of the reversing valve 3 and the oil tank 1. Specifically, the oil return line 54 is used to connect the second chamber 322 of the reversing valve 3 and the oil tank 1. The oil supply system also includes an oil inlet check valve 61 and an oil outlet check valve 62. The oil inlet check valve 61 is arranged upstream of the connection point between the valve opening line 53 and the oil inlet line 51, and the oil outlet check valve 62 is arranged between the reversing valve 3 and the oil cylinder 4. The oil supply system also includes a valve opening line 53, which is used to connect the first chamber 321 of the reversing valve 3, the pump gear 2, and the third chamber 323 of the reversing valve 3 in sequence. The forward and reverse rotation of the pump gear 2, in conjunction with the reversing valve 3, enables the oil supply and return of the oil supply system, making the pipeline structure simpler. Compared with the existing technology, components such as the oil unloading valve are omitted, significantly reducing the cost of the oil supply system.

[0037] Specifically, if Figure 1 As shown, the oil supply system is in the oil supply state, the oil inlet check valve 61 and the oil outlet check valve 62 are connected, the pump gear 2 rotates forward, and the oil inlet pipeline 51 is connected, so that the hydraulic oil in the oil tank 1 passes through the oil inlet check valve 61, the pump gear 2, the first chamber 321 of the reversing valve 3, the oil outlet check valve 62 and the oil cylinder 4 in sequence, thereby causing the cylinder rod of the oil cylinder 4 to rise.

[0038] like Figure 2 As shown, the oil supply system is in the open valve state, the oil inlet check valve 61 and the oil outlet check valve 62 are not connected, the pump gear 2 reverses, and the valve opening pipeline 53 is connected, so that the hydraulic oil in the first chamber 321 of the reversing valve 3 is pumped into the third chamber 323 of the reversing valve 3 through the pump gear 2, thereby pushing the push rod 31 of the reversing valve 3 to move, and the volume of the first chamber 321 continues to decrease, and the volume of the third chamber 323 continues to increase until the push rod 31 can no longer move and the oil return pipeline 54 is connected.

[0039] like Figure 3 As shown, the oil supply system is in the oil return state, the oil inlet check valve 61 and the oil outlet check valve 62 are not conducting, and the hydraulic oil in the cylinder 4 flows into the oil tank 1 through the second chamber 322 of the reversing valve 3.

[0040] In some embodiments, when the oil inlet line 51 is open, the rod of the oil cylinder 4 rises; when the oil return line 54 is open, the rod of the oil cylinder 4 descends.

[0041] In some embodiments, the oil supply system includes a pump assembly, which includes a pump body 71, and a pump front cover 72 and a pump rear cover 73 that are cooperatively connected to both sides of the pump body 71; the pump gear 2 and the reversing valve 3 are integrated on the pump assembly. Preferably, the pump gear 2 and the reversing valve 3 are integrated on the pump body 71, and part of the pipeline connecting the pump gear 2 and the reversing valve 3 is integrated on the pump assembly, so that the integration of the oil supply system is greatly improved, and the components integrated on the pump body 71 or the pump assembly are protected by the pump body 71 or the pump assembly, the structural strength is improved, and the risk of damage by external forces is reduced.

[0042] In some embodiments, a connecting shaft 21 is passed through the pump front cover 72 , and the connecting shaft 21 is connected to the driving motor.

[0043] In some embodiments, a pressure-replenishing valve 81 is further provided on the oil return line 54. Specifically, the pressure-replenishing valve 81 is connected to the pump body 71. In the oil return state, if the rod of the oil cylinder 4 bears a heavy load, the rod descends rapidly; if the rod of the oil cylinder 4 bears a light load or is unloaded, the rod descends slowly. The pressure-replenishing valve 81 can adjust the speed of the rod's descent, ensuring a smooth descent without descending too quickly or too slowly.

[0044] In some embodiments, a backup overflow port 73a is provided on the valve opening pipeline 53. Specifically, the backup overflow port 73a is provided on the pump rear cover 73. The pump rear cover 73 is provided with an opening, which is blocked by a plug 82 to form the backup overflow port 73a.

[0045] In some embodiments, the pump front cover 72 is also provided with an overflow line 55, one end of the overflow line 55 is connected to the line between the pump gear 2 and the oil outlet one-way valve 62, and the other end of the overflow line 55 is connected to the oil tank 1. An overflow one-way valve 63 is provided on the overflow line 55. The overflow one-way valve 63 opens after being subjected to a preset pressure, and the hydraulic oil can flow to the oil tank 1.

[0046] Specifically, in the oil supply state, the oil inlet check valve 61 is open, the push rod 31 is located at the leftmost end of the valve chamber, the oil outlet check valve 62 is open, the overflow check valve on the overflow line opens when it is subjected to a preset pressure, and the plug 82 on the backup overflow port 73a is closed or opened as needed. Preferably, the pump gear 2 stops after forward rotation, the return oil line 54 and the overflow line 55 are disconnected, and the oil supply system is in a pressure-maintaining state, ensuring that the oil pressure in the cylinder 4 is stable and prevents sudden drops in oil pressure.

[0047] In a second aspect, an embodiment of the present application further provides a vehicle comprising the aforementioned fuel supply system.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. An oil supply system, characterized in that: include: Oil tank, used for storing medium oil; Pump gear, used for pumping medium oil; Reversing valve, used to control the opening and closing of the oil return line; The oil inlet pipeline is used to connect the oil tank, pump gear, reversing valve and oil cylinder in sequence; The oil outlet pipeline is used to connect the oil cylinder and the reversing valve; The oil return line is used to connect the reversing valve and the oil tank.

2. The oil supply system according to claim 1, characterized in that: The reversing valve includes a push rod located in the valve cavity, which can divide the valve cavity into three chambers; the oil inlet pipeline is used to connect the oil tank, pump gear, the first chamber of the reversing valve and the oil cylinder in sequence; the oil outlet pipeline is used to connect the oil cylinder and the second chamber of the reversing valve; the oil return pipeline is used to connect the second chamber of the reversing valve and the oil tank.

3. The oil supply system according to claim 2, characterized in that: The oil supply system further comprises a valve opening pipeline for sequentially connecting the first chamber of the reversing valve, the pump gear and the third chamber of the reversing valve.

4. The oil supply system according to claim 1, characterized in that: When the oil inlet pipeline is open, the cylinder rod of the oil cylinder rises; when the oil return pipeline is open, the cylinder rod of the oil cylinder descends.

5. The oil supply system according to claim 1, characterized in that: It also includes an oil inlet one-way valve and an oil outlet one-way valve. The oil inlet one-way valve is arranged upstream of the connection point between the valve opening pipeline and the oil inlet pipeline, and the oil outlet one-way valve is arranged between the reversing valve and the oil cylinder.

6. The oil supply system according to claim 1, characterized in that: It includes a pump assembly, which includes a pump body, and a pump front cover and a pump rear cover that are connected to both sides of the pump body; the pump gear and the reversing valve are integrated on the pump body, and part of the pipeline connecting the pump gear and the reversing valve is integrated on the pump assembly.

7. The oil supply system according to claim 6, characterized in that: A connecting shaft is passed through the pump front cover, and the connecting shaft is connected to the driving motor.

8. The oil supply system according to claim 1, characterized in that: A pressure-compensating valve is also provided on the oil return pipeline; And / or, the oil supply system also includes an overflow pipe, one end of the overflow pipe is connected to the pipe between the pump gear and the oil outlet one-way valve, and the other end of the overflow pipe is connected to the oil tank. An overflow one-way valve is provided on the overflow pipe. The overflow one-way valve opens after being subjected to a preset pressure, and the hydraulic oil can flow to the oil tank.

9. The oil supply system according to claim 3, characterized in that: A spare overflow port is provided on the valve opening pipeline.

10. A vehicle, characterized in that: The oil supply system comprises the oil supply system according to any one of claims 1 to 9.

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