Control valve group

Abstract

The utility model belongs to the technical field of hydraulic systems, and discloses a control valve group which comprises a pressure regulating valve, an on-off valve, a gear shifting reversing valve and an energy accumulator, an oil inlet and a hydraulic control end e1 of the pressure regulating valve are respectively communicated with a driving pump, a first oil outlet of the pressure regulating valve is communicated with an oil inlet of the on-off valve, an oil outlet of the on-off valve is communicated with an oil inlet of the gear shifting reversing valve, and a second oil outlet of the on-off valve is communicated with an oil outlet of the energy accumulator. A working oil port a of the gear shifting reversing valve is communicated with an oil inlet of the energy accumulator, a working oil port b of the gear shifting reversing valve is communicated with the oil tank, and a piston of the energy accumulator is connected with the regulating end e2 of the pressure regulating valve through a spring. According to the control valve set, when the gear shifting reversing valve is located at the neutral gear, the energy accumulator is connected with the oil tank, when the gear shifting reversing valve is located at other gears, the energy accumulator is disconnected with the oil tank, and the system pressure reaches a rated value, so that the pressure of a driving pump and the system at the neutral gear is effectively reduced, and the power, energy consumption and noise of the driving pump are reduced; and the impact in the gear shifting process is also relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a control valve group. Background Art

[0002] A speed control valve group used in a loader gearbox in the prior art Figure 1 As shown, Figure 1 The control valve group includes components such as a pressure regulating valve 1', an on-off valve 2', a gear-adjusting reversing valve 3', and an accumulator 4', wherein the oil inlet and the hydraulic control end e1 of the pressure regulating valve 1' are connected to an oil tank (not shown) through a driving pump (not shown), respectively, the oil outlet of the pressure regulating valve 1' is connected to the oil inlet of the on-off valve 2', the oil outlet of the on-off valve 2' is connected to the oil inlet of the gear-adjusting reversing valve 3', the oil inlet of the accumulator 4' is connected to the pipeline between the oil outlet of the on-off valve 2' and the oil inlet of the gear-adjusting reversing valve 3' through an oil pipe 5', and the oil outlet of the accumulator 4' is connected to the hydraulic control end e2 of the pressure regulating valve 1'.

[0003] When the above-mentioned speed control valve group is working, the on-off valve 2' is in the conducting position, the driving pump pumps oil from the oil tank, and the hydraulic oil enters the corresponding gear position through the pressure regulating valve 1', the on-off valve 2' and the gear-adjusting reversing valve 3'. The on-off of the on-off valve 2' is controlled by the brake air circuit or liquid circuit connected to it. Specifically, before the driving pump is turned on, the pressure regulating valve 1' is in the right position under the action of the spring force on its right side; after the driving pump is turned on, the left side of the pressure regulating valve 1' is moved to the right by the oil pressure of the hydraulic control end e1, and the right side of the pressure regulating valve 1' is moved to the left by the force of the accumulator 4' piston on the hydraulic control end e2 and the thrust of the spring, and the two reach a balance, the valve core is in the middle position shown in the figure, and the system pressure reaches the rated value. When the on-off valve 2' is switched to the cut-off position, the hydraulic circuits leading to each gear and the oil pipe 5' are depressurized and the pressure returns to zero; the pressure regulating valve 1' moves to the left and is finally in the left position, and the system pressure decreases.

[0004] In the above-mentioned structure, the oil inlet of the accumulator 4' is connected to the pipeline between the oil outlet of the on-off valve 2' and the oil inlet of the gear regulating reversing valve 3' through the oil pipe 5'. This will cause the driving pump to be in a load state when the gear regulating reversing valve 3' is in the neutral position, resulting in high energy consumption and high noise. The system pressure cannot drop to the minimum value quickly, and the oil filling pressure is high, exceeding the sliding friction pressure required for the corresponding gear, resulting in a certain impact when the vehicle shifts from neutral to forward gear or reverse gear. Utility Model Content

[0005] The utility model aims to provide a control valve group, which optimizes the oil circuit structure. When the gear-adjusting reversing valve is in the neutral position, the accumulator and the oil tank are connected and are in a pressure-relief state, and the system pressure is in a low pressure state; in other gears, the accumulator and the oil tank are disconnected, and the system pressure reaches the rated value, which effectively reduces the pressure of the drive pump and the system in the neutral gear, reduces the power, energy consumption and noise of the drive pump, and also reduces the impact during the gear shifting process.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A control valve group includes a pressure regulating valve, an on-off valve, a gear-adjusting reversing valve and an accumulator; wherein:

[0008] The oil inlet of the pressure regulating valve and the hydraulic control end e1 are respectively connected to the driving pump, the first oil outlet of the pressure regulating valve is connected to the oil inlet of the on-off valve, the oil outlet of the on-off valve is connected to the oil inlet of the gear-adjusting reversing valve, the working oil port a of the gear-adjusting reversing valve is connected to the oil inlet of the accumulator, the working oil port b of the gear-adjusting reversing valve is connected to the oil tank, and the accumulator is used to apply force to the regulating end e2 of the pressure regulating valve;

[0009] The gear-adjusting reversing valve has a neutral gear position and at least one other gear position;

[0010] When the shift reversing valve is in the neutral position, the working oil port a is connected to the working oil port b; when the shift reversing valve is switched from the neutral position to other gear positions, the working oil port a is connected to the oil inlet of the shift reversing valve.

[0011] Preferably, the oil outlet of the on-off valve is connected to the oil inlet of the accumulator through a first oil pipe, and a second oil pipe is connected in parallel to the first oil pipe;

[0012] A throttling member is provided on the first oil pipe, and the throttling member is located between two connecting ends of the second oil pipe;

[0013] A one-way valve is disposed on the second oil pipe, and the one-way valve is configured to conduct the second oil pipe in a one-way direction from the accumulator to the on-off valve.

[0014] Preferably, the throttling member is configured as a damping hole or a throttling plate.

[0015] Preferably, it further comprises a driving cylinder, wherein the rodless chamber of the driving cylinder is connected to an external air source or a hydraulic oil source, and the piston rod of the driving cylinder is connected to the on-off valve.

[0016] Preferably, an elastic return member is provided in the driving cylinder, one end of the elastic return member is connected to the cylinder body of the driving cylinder, and the other end of the elastic return member is connected to the piston of the driving cylinder.

[0017] Preferably, the elastic return member is configured as a spring.

[0018] Preferably, the shift reversing valve further comprises an oil return port, a working oil port c, a working oil port d and a working oil port e;

[0019] The other gears include a first forward gear, a second forward gear and a reverse gear; wherein,

[0020] When in the neutral position, the working oil port c, the working oil port d, and the working oil port e are respectively connected to the oil return port of the shift reversing valve;

[0021] When in the first forward gear position, the oil inlet of the gear-adjusting reversing valve is connected to the working oil port c, and the working oil port d and the working oil port e are respectively connected to the oil return port of the gear-adjusting reversing valve;

[0022] When in the second forward gear position, the oil inlet of the gear-adjusting reversing valve is connected to the working oil port d, and the working oil port c and the working oil port e are respectively connected to the oil return port of the gear-adjusting reversing valve;

[0023] When in the reverse gear position, the oil inlet of the gear-adjusting reversing valve is connected to the working oil port e, and the working oil port c and the working oil port d are respectively connected to the oil outlet of the gear-adjusting reversing valve.

[0024] Preferably, the gear regulating reversing valve is connected to a gear shifting handle, and the gear regulating reversing valve is driven to move by moving the gear shifting handle to switch gears.

[0025] Preferably, the pressure regulating valve further has a second oil outlet, and the second oil outlet is connected to the torque converter.

[0026] Preferably, the pressure regulating valve further has a third oil outlet, and the third oil outlet is connected to the oil tank.

[0027] Beneficial effects:

[0028] The control valve group provided by the utility model, when the shift-adjusting reversing valve is in the neutral position, the working oil port a is connected to the working oil port b, so that the connection between the accumulator and the oil tank is in a pressure-relief state, and the system pressure is in a low-pressure zone; when the shift-adjusting reversing valve is switched from the neutral position to other gears, the working oil port a is connected to the oil inlet of the shift-adjusting reversing valve, so that the drive pump is disconnected from the oil tank, and the accumulator is connected through the on-off valve, so that the system pressure reaches the rated value, effectively reducing the pressure of the drive pump and the system when the shift-adjusting reversing valve is in the neutral position, reducing the power, energy consumption and noise of the drive pump. In addition, when the shift-adjusting reversing valve is switched from the neutral position to other gears, the oil pressure increases from low to high, ensuring that the system pressure curve does not exceed the sliding friction pressure required for the corresponding gear, so that the gear shift is smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a control valve group provided by the prior art;

[0030] Figure 2 It is a structural schematic diagram of a control valve group provided by the utility model.

[0031] In the figure:

[0032] 1', pressure regulating valve; 2', on-off valve; 3', gear-adjusting reversing valve; 4', accumulator; 5', oil pipe;

[0033] 1. Pressure regulating valve;

[0034] 2. On-off valve;

[0035] 3. Shift-shift reversing valve;

[0036] 4. Accumulator;

[0037] 51. throttle; 52. one-way valve; 53. drive cylinder; 531. elastic reset member; 54. shift handle;

[0038] 61. First oil pipeline; 62. Second oil pipeline; 63. Third oil pipeline; 64. Fourth oil pipeline. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] This embodiment provides a control valve group. Figure 2 As shown, the control valve group includes a pressure regulating valve 1, an on-off valve 2, a gear-adjusting reversing valve 3 and an accumulator 4, wherein the oil inlet of the pressure regulating valve 1 and the hydraulic control end e1 are respectively connected to a driving pump (not shown), the first oil outlet of the pressure regulating valve 1 is connected to the oil inlet of the on-off valve 2, the oil outlet of the on-off valve 2 is connected to the oil inlet of the gear-adjusting reversing valve 3, the working oil port a of the gear-adjusting reversing valve 3 is connected to the oil inlet of the accumulator 4, the working oil port b of the gear-adjusting reversing valve 3 is connected to the oil tank, and the accumulator 4 is used to apply force to the control end e2 of the pressure regulating valve 1. The gear-adjusting reversing valve 3 has a neutral position and at least one other gear position. When the gear-adjusting reversing valve 3 is in the neutral position, the working oil port a is connected to the working oil port b; when the gear-adjusting reversing valve 3 is switched from the neutral position to other gear positions, the working oil port a is connected to the oil inlet of the gear-adjusting reversing valve 3.

[0044] Specifically, the piston of the accumulator 4 is connected to the regulating end e2 of the pressure regulating valve 1 through a spring.

[0045] Specifically, when the above-mentioned speed control valve group is working, the on-off valve 2 is in the on position, the driving pump pumps oil from the oil tank, and the hydraulic oil enters the corresponding gear through the pressure regulating valve 1, the on-off valve 2, and the gear reversing valve 3. Before the driving pump is turned on, the pressure regulating valve 1 is in the right position under the action of the spring force on its right side; after the driving pump is turned on, the left side of the pressure regulating valve 1 is moved to the right by the oil pressure of the hydraulic control end e1, and the right side of the pressure regulating valve 1 is moved to the left by the force of the accumulator 4 piston on the control end e2 and the thrust of the spring, and the two reach a balance, that is, the system pressure reaches the rated value. When the on-off valve 2 is switched to the off position, the hydraulic circuit leading to each gear and the oil pipe is depressurized, and the pressure returns to zero; the pressure regulating valve 1 moves to the left and is finally in the left position, and the system pressure decreases.

[0046] When the shift reversing valve 3 is in the neutral position, the working oil port a is connected to the working oil port b, so that the accumulator 4 is connected to the oil tank and is in a pressure relief state, and the system pressure is in a low-pressure zone; when the shift reversing valve 3 is switched from the neutral position to other gears, the working oil port a is connected to the oil inlet of the shift reversing valve 3, so that the drive pump is disconnected from the oil tank, and connected to the accumulator 4 through the on-off valve 2, so that the system pressure reaches the rated value, effectively reducing the pressure of the drive pump and the system when the shift reversing valve 3 is in the neutral position, reducing the power, energy consumption and noise of the drive pump. In addition, when the shift reversing valve 3 is switched from the neutral position to other gears, the oil pressure increases from low to high, ensuring that the system pressure curve does not exceed the sliding friction pressure required for the corresponding gear, so that the gear shift is smooth.

[0047] Specifically, the oil inlet of the driving pump is connected to the oil tank, and the oil outlet of the driving pump is connected to the oil inlet of the pressure regulating valve 1. Specifically, the oil outlet of the driving pump is connected to the oil inlet of the pressure regulating valve 1 through the third oil pipe 63. The third oil pipe 63 is connected with a fourth oil pipe 64, and the fourth oil pipe 64 is connected to the hydraulic control end e1 of the pressure regulating valve 1.

[0048] In this embodiment, the oil outlet of the on-off valve 2 is connected to the oil inlet of the accumulator 4 through the first oil pipe 61, and the second oil pipe 62 is connected in parallel to the first oil pipe 61; the first oil pipe 61 is provided with a throttle 51, and the throttle 51 is located between the two connecting ends of the second oil pipe 62. The second oil pipe 62 is provided with a one-way valve 52, and the one-way valve 52 is configured to unidirectionally conduct the second oil pipe 62 in the direction from the accumulator 4 to the on-off valve 2.

[0049] Specifically, by setting the throttle 51 and the one-way valve 52, when the oil is delivered to the accumulator 4, the oil is input into the accumulator 4 through the first oil pipe 61 and the throttle 51, and the throttle 51 effectively slows down the oil flow rate in the first oil pipe 61, so that the oil pressure of the pipeline system rises slowly; when the accumulator 4 is depressurized, the oil flows through the one-way valve 52 through the second oil pipe 62 and the on-off valve 2 to return to the oil tank, so that the oil pressure of the pipeline drops rapidly. The above process can effectively realize the fast discharge and slow filling of the oil in the accumulator 4, and the corresponding oil pressure drops quickly and rises slowly, ensuring that the original gear is disengaged quickly and the new gear is engaged smoothly during the gear shifting process.

[0050] As an optional implementation, the throttling member 51 is configured as a damping hole or a throttling plate.

[0051] Furthermore, the control valve group also includes a drive cylinder 53, the rodless cavity of the drive cylinder 53 is connected to an external gas source or hydraulic oil source, and the piston rod of the drive cylinder 53 is connected to the on-off valve 2. Specifically, when the external gas source or hydraulic oil source is filled into the rodless cavity of the drive cylinder 53, the cylinder rod of the drive cylinder 53 is pushed to move rightward, so that the cylinder rod pushes the on-off valve 2 to move and switch from the on position to the off position.

[0052] As an optional implementation, an external gas source or hydraulic oil source can be directly connected to the hydraulic control end e3 of the on-off valve 2, and the on-off valve 2 is pushed to move by gas or hydraulic oil to achieve switching.

[0053] Furthermore, an elastic reset member 531 is provided in the driving cylinder 53, one end of the elastic reset member 531 is connected to the cylinder body of the driving cylinder 53, and the other end of the elastic reset member 531 is connected to the piston of the driving cylinder 53. Specifically, the on-off valve 2 itself is provided with a reset spring, and the reset spring is suitable for providing a force forcing the on-off valve 2 to move to the on position, that is, the right position. The provision of the elastic reset member 531 can reset the piston of the driving cylinder 53, so that the on-off valve 2 itself can be reset under the action of the reset spring.

[0054] Optionally, the elastic return member 531 is configured as a spring.

[0055] In this embodiment, the shift reversing valve 3 has an oil return port, a working oil port a, and a working oil port b, as well as an oil return port, a working oil port c, a working oil port d, and a working oil port e. Other gear positions include a first forward gear position, a second forward gear position, and a reverse gear position. Among them, when in the neutral gear position, the working oil port c, the working oil port d, and the working oil port e are respectively connected to the oil return port of the shift reversing valve 3; when in the first forward gear position, the oil inlet of the shift reversing valve 3 is connected to the working oil port c, and the working oil port d and the working oil port e are respectively connected to the oil return port of the shift reversing valve 3; when in the second forward gear position, the oil inlet of the shift reversing valve 3 is connected to the working oil port d, and the working oil port c and the working oil port e are respectively connected to the oil return port of the shift reversing valve 3; when in the reverse gear position, the oil inlet of the shift reversing valve 3 is connected to the working oil port e, and the working oil port c and the working oil port d are respectively connected to the oil return port of the shift reversing valve 3.

[0056] Specifically, the working oil port c is connected to the first forward gear oil circuit, the working oil port d is connected to the second forward gear oil circuit, and the working oil port e is connected to the reverse gear oil circuit. When the gear adjustment reversing valve 3 is switched to different gears, the engineering machinery can finally operate in the corresponding gear working condition.

[0057] In this embodiment, the gear-adjusting reversing valve 3 is connected to a gear-shifting handle 54, and the gear-adjusting reversing valve 3 is driven to move to switch gears by moving the gear-shifting handle 54. Specifically, the gear-shifting handle 54 is swung to different positions to switch between different gears.

[0058] In this embodiment, the pressure regulating valve 1 includes a second oil outlet and a third oil outlet in addition to the oil inlet and the first oil outlet, wherein the second oil outlet is connected to the torque converter, and the third oil outlet is connected to the oil tank.

[0059] Specifically, in this embodiment, the pressure regulating valve 1 has three working positions, namely the first pressure regulating position, the second pressure regulating position and the third pressure regulating position. When the pressure regulating valve 1 is located in any of the above working positions, the first oil outlet of the pressure regulating valve 1 is connected to the oil inlet of the on-off valve 2. In addition, when the pressure regulating valve 1 is located in the first pressure regulating position, the second oil outlet is connected to the torque converter, and the third oil outlet is connected to the oil tank. When the pressure regulating valve 1 is located in the second pressure regulating position, the second oil outlet is connected to the torque converter, and the third oil outlet is in a cut-off state. When the pressure regulating valve 1 is located in the third pressure regulating position, the second oil outlet and the third oil outlet are both in a cut-off state.

[0060] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A control valve group, characterized in that: It comprises a pressure regulating valve (1), an on-off valve (2), a gear-adjusting reversing valve (3) and an accumulator (4); wherein: The oil inlet and the hydraulic control end e1 of the pressure regulating valve (1) are respectively connected to the driving pump, the first oil outlet of the pressure regulating valve (1) is connected to the oil inlet of the on-off valve (2), the oil outlet of the on-off valve (2) is connected to the oil inlet of the gear-adjusting reversing valve (3), the working oil port a of the gear-adjusting reversing valve (3) is connected to the oil inlet of the accumulator (4), the working oil port b of the gear-adjusting reversing valve (3) is connected to the oil tank, and the accumulator (4) is used to apply force to the regulating end e2 of the pressure regulating valve (1); The gear-adjusting reversing valve (3) has a neutral gear position and at least one other gear position; When the gear-adjusting reversing valve (3) is in a neutral position, the working oil port a is connected to the working oil port b; when the gear-adjusting reversing valve (3) is switched from the neutral position to another gear position, the working oil port a is connected to the oil inlet of the gear-adjusting reversing valve (3).

2. The control valve assembly according to claim 1, characterized in that: The oil outlet of the on-off valve (2) is connected to the oil inlet of the accumulator (4) through a first oil pipe (61), and a second oil pipe (62) is connected in parallel to the first oil pipe (61); The first oil pipe (61) is provided with a throttling member (51), and the throttling member (51) is located between two connecting ends of the second oil pipe (62); A one-way valve (52) is provided on the second oil pipe (62), and the one-way valve (52) is configured to unidirectionally conduct the second oil pipe (62) in a direction from the accumulator (4) to the on-off valve (2).

3. The control valve assembly according to claim 2, characterized in that: The throttling member (51) is configured as a damping hole or a throttling plate.

4. The control valve assembly according to claim 1, characterized in that: It also comprises a driving cylinder (53), the rodless chamber of the driving cylinder (53) is connected to an external air source or a hydraulic oil source, and the piston rod of the driving cylinder (53) is connected to the on-off valve (2).

5. The control valve assembly according to claim 4, characterized in that: An elastic return member (531) is provided in the driving cylinder (53); one end of the elastic return member (531) is connected to the cylinder body of the driving cylinder (53), and the other end is connected to the piston of the driving cylinder (53).

6. The control valve assembly according to claim 5, characterized in that: The elastic return member (531) is configured as a spring.

7. The control valve assembly according to claim 1, characterized in that: The shift-adjusting reversing valve (3) also has an oil return port, a working oil port c, a working oil port d and a working oil port e; The other gears include a first forward gear, a second forward gear and a reverse gear; wherein, When in the neutral position, the working oil port c, the working oil port d, and the working oil port e are respectively connected to the oil return port of the gear adjustment reversing valve (3); When in the first forward gear position, the oil inlet of the gear-adjusting reversing valve (3) is connected to the working oil port c, and the working oil port d and the working oil port e are respectively connected to the oil return port of the gear-adjusting reversing valve (3); When in the second forward gear position, the oil inlet of the gear-adjusting reversing valve (3) is connected to the working oil port d, and the working oil port c and the working oil port e are respectively connected to the oil return port of the gear-adjusting reversing valve (3); When in the reverse gear position, the oil inlet of the gear-adjusting reversing valve (3) is connected to the working oil port e, and the working oil port c and the working oil port d are respectively connected to the oil outlet of the gear-adjusting reversing valve (3).

8. The control valve assembly according to claim 1, characterized in that: The gear adjustment reversing valve (3) is connected to a gear shifting handle (54), and the gear adjustment reversing valve (3) is driven to move by moving the gear shifting handle (54) to switch gears.

9. The control valve assembly according to claim 1, characterized in that: The pressure regulating valve (1) also has a second oil outlet, and the second oil outlet is connected to the torque converter.

10. The control valve assembly according to claim 1, characterized in that: The pressure regulating valve (1) also has a third oil outlet, and the third oil outlet is connected to the oil tank.

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