A reversing valve

Abstract

The present invention relates to a reversing valve, which is mainly composed of a valve body, a first valve core and a second valve core; the first valve core and the second valve core are arranged in parallel in the valve body and can rotate relative to the valve body; the second valve core is provided with a radial oil passage and an arc-shaped oil passage, the first valve core is provided with two radial oil passages parallel to each other, one of which is on the same cross section as the radial oil passage of the second valve core; the valve body is provided with multiple oil passages: the valve core of the present invention can rotate inside the valve body, and when the reversing valve is connected to a differential lifting system and a non-differential lifting system at the same time, the switching function of two different types of hydraulic systems can be conveniently realized by manipulating the valve core. The structure is compact, the processability is good, the weight is light, the cost is low, and the operation is simple.

Description

Technical Field

[0001] The invention belongs to the field of hydraulics, and in particular relates to a reversing valve which is applied to switching between a hydraulic lifting system and a hydraulic spare tire system in a heavy truck cab. Background Art

[0002] At present, when the hydraulic lifting system of the cab of a heavy-duty vehicle and the hydraulic spare tire system share a manual pump, the oil cylinders used by the hydraulic lifting system of the cab and the hydraulic spare tire system are non-differential lifting oil cylinders, and the switching of the two systems can be achieved through an ordinary two-position four-way valve. When the cab lifting system adopts a differential lifting system and the hydraulic spare tire cylinder adopts a non-differential lifting oil cylinder, the ordinary two-position four-way valve cannot achieve the switching of the two systems. Summary of the invention

[0003] The present invention provides a reversing valve, which aims to solve the technical problem of: solving the switching problem of the two systems when the cab lifting system adopts a differential lifting system and the hydraulic spare tire cylinder adopts a non-differential lifting cylinder and the two systems share a manual pump.

[0004] In order to solve the above technical problems, the present invention provides a reversing valve, which is characterized by: mainly consisting of a valve body, a first valve core, and a second valve core;

[0005] The first valve core and the second valve core are arranged in parallel in the valve body and can rotate relative to the valve body; the second valve core is provided with a radial oil passage and an arc-shaped oil passage, and the first valve core is provided with two radial oil passages parallel to each other, one of which is on the same cross section as the radial oil passage of the second valve core;

[0006] The valve body is provided with a plurality of oil passages: including an AC oil passage and an AE oil passage intersecting with each other, and being in the same section as another radial oil passage on the first valve core;

[0007] Also included are intersecting BD oil passages and BF oil passages, which are in the same cross section as a radial oil passage on the first valve core and a radial oil passage on the second valve core;

[0008] It also includes an FG oil passage corresponding to the arc-shaped oil passage on the second valve core.

[0009] Beneficial effects: The valve core of the present invention can rotate inside the valve body. When the reversing valve is connected to the differential lifting system and the non-differential lifting system at the same time, the switching function of two different types of hydraulic systems can be conveniently realized by manipulating the valve core. It has a compact structure, good processability, light weight, low cost and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural principle diagram of the present invention.

[0011] Figure 2It is a cross-sectional view of the present invention and also a working position diagram;

[0012] Figure 3 , Figure 4 are two other working position diagrams of the present invention;

[0013] Figure 5 It is a hydraulic principle diagram when the present invention is applied to two different types of systems.

[0014] in:

[0015] 1. Valve body 2. Sealing ring 3. Valve core 4. Sealing ring 5. Pin 6. Valve core 7. Pin 8. Plug 9. Plug 10. Non-differential double-acting oil cylinder 11. Differential double-acting oil cylinder 12. Directional valve (involved in the present invention) 13. Directional valve 14. Manual pump assembly 15. Oil tank 16. Manual pump

[0016] A, B, C, D, E, F, G are the oil ports of the reversing valve

[0017] Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ are different working positions of the reversing valve. DETAILED DESCRIPTION

[0018] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below.

[0019] The reversing valve proposed in the present invention is characterized by being mainly composed of a valve body 1, a sealing ring 2, a first valve core 3, a sealing ring 4, a pin 5, a second valve core 6, a pin 7, a plug 8, and a plug 9;

[0020] The first valve core 3 and the second valve core 6 are arranged in parallel in the valve body and can rotate relative to the valve body;

[0021] The second valve core 6 is provided with a radial oil passage and an arc-shaped oil passage, and the first valve core 3 is provided with two radial oil passages parallel to each other, one of which is on the same cross section as the radial oil passage of the second valve core 6;

[0022] The valve body 1 is provided with a plurality of oil passages, including an AC oil passage and an AE oil passage intersecting with each other, and having the same cross section as another radial oil passage on the first valve core 3;

[0023] It also includes intersecting BD oil passages and BF oil passages, which are in the same cross section as a radial oil passage on the first valve core 3 and a radial oil passage on the second valve core 6;

[0024] It also includes an FG oil passage corresponding to the arc-shaped oil passage on the second valve core 6;

[0025] The first valve core 3 and the valve body 1 are sealed by three sealing rings 2, and the axial positioning of the first valve core 3 is achieved by the annular groove and the pin 7 on the first valve core 3. The second valve core 6 and the valve body 1 are sealed by two sealing rings 4, and the axial positioning of the second valve core 6 is achieved by the annular groove and the pin 5 on the second valve core 6.

[0026] exist Figure 2 When the position is shown, the reversing valve is in the first working position, the AC oil passage is connected, and the BD oil passage is connected; based on the first working position, the first valve core rotates 90 degrees, the second valve core does not move, and the reversing valve is in the second working position. Figure 3 In the position shown, the AE oil passage is connected, and the FG oil passage is connected; based on the second working position, the first valve core does not rotate, the second valve core 6 rotates 90 degrees, and the reversing valve is in the third working position. Figure 4 In the position shown, the AE oil passage is connected and the BF oil passage is connected.

[0027] The C oil port is connected to the rodless chamber of the differential double-acting cylinder 11, and the D oil port is connected to the rod chamber of the differential double-acting cylinder 11; the E oil port is connected to the rodless chamber of the non-differential double-acting cylinder 10, and the F oil port is connected to the rod chamber of the non-differential double-acting cylinder 10; the F oil port returns oil through the G oil port.

[0028] The working process is as follows:

[0029] See also Figure 5 The reversing valve 12 in the figure is a specific application of the reversing valve involved in the present invention in two different types of hydraulic systems.

[0030] When the differential double-acting cylinder 11 is operated alone, the reversing valve 12 is placed in position III. When the cylinder 11 is to be extended, the reversing valve 13 of the manual pump assembly 14 should be operated to be placed in position I. Then the manual pump assembly 14 is operated, and the pressure oil enters the rodless chamber of the cylinder 11 through the A and C ports of the reversing valve 12, and enters the rod chamber of the cylinder 11 through the B and D ports. The pressure oil extends the cylinder 11 through the cross-sectional area difference, that is, through the cross-sectional area of ​​the piston rod of the cylinder 11. If the oil cylinder 11 is to be retracted, the reversing valve 13 of the manual pump assembly 14 should be operated to be in position II, and then the manual pump assembly 14 should be operated, and the pressure oil will enter the rod chamber of the oil cylinder 11 through the B port and the D port of the reversing valve 12, and at the same time, the hydraulic oil in the rodless chamber of the oil cylinder 11 will pass through the C port and the A port of the reversing valve 12 and return to the oil tank 15 of the manual pump assembly 14 through the reversing valve 13, so that the retraction action of the oil cylinder 11 can be realized.

[0031] When the non-differential double-acting cylinder 10 is operated alone, the reversing valve 12 is placed in position IV. If the cylinder 10 is to be extended, the reversing valve 13 of the manual pump assembly 14 should be operated to be placed in position I, and then the reversing valve 12 should be placed in position V. Then the manual pump assembly 14 is operated, and the pressure oil will enter the rodless chamber of the cylinder 10 through the A and E ports of the reversing valve 12. At the same time, the hydraulic oil in the rod chamber of the cylinder 10 will directly return to the oil tank 15 of the manual pump assembly 14 through the F and G ports of the reversing valve 12. In this way, the extension action of the cylinder 10 can be achieved. If the oil cylinder 10 is to be retracted, the reversing valve 13 of the manual pump assembly 14 should be operated to be in position II, and then the reversing valve 12 should be in position VI. Then the manual pump assembly 14 is operated, and the pressure oil will enter the rod chamber of the oil cylinder 10 through the B port and the F port of the reversing valve 12. At the same time, the hydraulic oil in the rodless chamber of the oil cylinder 10 will pass through the E port and the A port of the reversing valve 12 and return to the oil tank 15 of the manual pump assembly 14 through the reversing valve 13. In this way, the retraction action of the oil cylinder 10 can be realized.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A reversing valve, characterized in that: It is mainly composed of a valve body, a first valve core and a second valve core; The first valve core and the second valve core are arranged in parallel in the valve body and can rotate relative to the valve body; the second valve core is provided with a radial oil passage and an arc-shaped oil passage, and the first valve core is provided with two radial oil passages parallel to each other, one of which is on the same cross section as the radial oil passage of the second valve core; The valve body is provided with a plurality of oil passages: including an AC oil passage and an AE oil passage intersecting with each other, and being in the same section as another radial oil passage on the first valve core; Also included are intersecting BD oil passages and BF oil passages, which are in the same cross section as a radial oil passage on the first valve core and a radial oil passage on the second valve core; It also includes an FG oil passage corresponding to the arc-shaped oil passage on the second valve core; Annular grooves are provided on the first valve core and the second valve core, and the axial positioning of the two valve cores is achieved by the cooperation of the annular grooves and the pins; the C oil port is connected to the rodless chamber of the differential double-acting cylinder, and the D oil port is connected to the rod chamber of the differential double-acting cylinder; the E oil port is connected to the rodless chamber of the non-differential double-acting cylinder, and the F oil port is connected to the rod chamber of the non-differential double-acting cylinder; the F oil port returns oil through the G oil port; when the reversing valve is in the first working position, the AC oil channel is connected, and the BD oil channel is connected; on the basis of the first working position, the first valve core rotates 90 degrees and the second valve core does not move, the reversing valve is in the second working position, the AE oil channel is connected, and the FG oil channel is connected; on the basis of the second working position, the first valve core does not rotate, the second valve core rotates 90 degrees, the reversing valve is in the third working position, the AE oil channel is connected, and the BF oil channel is connected.

2. A reversing valve according to claim 1, characterized in that: The first valve core, the second valve core and the valve body are sealed by a plurality of sealing rings.

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