Novel priority valve

Abstract

The utility model discloses a novel priority valve, which can increase the flow supplied to a steering hydraulic system when the steering pressure is increased so as to enable a driver to operate more easily, and comprises a valve body and a priority valve assembly, the valve body is provided with an oil inlet cavity, a flow dividing channel, a steering oil cavity and a working oil cavity. The oil inlet oil cavity is directly communicated with the steering oil cavity and is communicated with the working oil cavity through the shunting channel; the priority valve assembly comprises a flow dividing valve element, a flow dividing spring and a flow dividing valve rod. The flow dividing valve element is arranged in the flow dividing channel and used for controlling the flow entering the working oil cavity, and a priority valve upper cavity and a priority valve lower cavity are formed between the two ends of the flow dividing valve element and the two ends of the flow dividing channel respectively. The shunting spring is arranged in the priority valve upper cavity; the diverter valve rod is arranged in the priority valve lower cavity, and the diverter valve rod is sleeved with the lower end of the diverter valve element.

Description

Technical Field

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

[0002] As a widely used construction machinery, the loader has different uses and complex working conditions, which determines the complexity of its hydraulic system. The hydraulic system of the loader generally includes a working hydraulic system and a steering hydraulic system, which are driven by a working oil pump and a steering oil pump respectively, and the priority valve is used to divert the flow and divert the hydraulic oil to the two systems.

[0003] The hydraulic pressure action area at both ends of the existing priority valve is equal. When the machine is not turning, the priority valve is in a fully open state. When turning, the steering wheel rotation speed corresponds to the steering flow and the hydraulic oil flow output by the steering oil pump. When the steering pressure remains unchanged, the priority valve opening remains unchanged, that is, the steering speed of the machine remains unchanged, and the hydraulic oil output by the steering oil pump remains unchanged through the priority valve diversion flow; when the steering pressure corresponding to the steering resistance increases, the hydraulic oil pressure output by the steering oil pump increases, and the priority valve opening remains unchanged at this time. The hydraulic oil output by the steering oil pump increases through the priority valve diversion return oil flow, and the corresponding hydraulic oil flow supplied to the steering hydraulic system decreases, the steering speed of the machine decreases, and the operation becomes more difficult. Utility Model Content

[0004] The utility model aims to provide a new priority valve to solve the problems existing in the prior art and to increase the flow supplied to the steering hydraulic system when the steering pressure increases, so that the driver's operation is easier.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A new priority valve comprises a valve body and a priority valve assembly; the valve body is provided with an oil inlet chamber, a diverter channel, a steering oil chamber and a working oil chamber; the oil inlet chamber is directly connected to the steering oil chamber, and is connected to the working oil chamber through the diverter channel; the priority valve assembly comprises a diverter valve core, a diverter spring and a diverter valve stem; the diverter valve core is arranged in the diverter channel for controlling the flow entering the working oil chamber, and a priority valve upper chamber and a priority valve lower chamber are formed between its two ends and the two ends of the diverter channel respectively; the diverter spring is arranged in the priority valve upper chamber; the diverter valve stem is arranged in the priority valve lower chamber, and the lower end of the diverter valve core is sleeved on the diverter valve stem.

[0007] Both ends of the diverter channel penetrate to the surface of the valve body; the priority valve assembly also includes a first plug, a second plug and a sealing plug; the first plug and the second plug are respectively sealed and fitted at the two ends of the diverter channel, and form the priority valve upper chamber and the priority valve lower chamber between the two ends of the diverter valve core; the two ends of the diverter spring respectively abut the first plug and the end of the diverter valve core.

[0008] Preferably, a movable groove is provided in the second plug; one end of the diverter valve stem is movably fitted in the movable groove and is provided with a limiting plate, and the other end thereof passes through the bottom of the movable groove and the end of the diverter valve core in sequence; the sealing plug seals the opening of the movable groove.

[0009] An oil return hole is provided at one end of the diverter valve core close to the diverter spring; the oil return hole connects the circumferential surface of the diverter valve core to the upper chamber of the priority valve, in which a pilot valve seat, a pilot valve core and a pilot valve spring are provided, and the pilot valve core movably seals the opening of the pilot valve seat under the elastic force of the pilot valve spring.

[0010] An oil hole is provided at the lower end of the diverter valve core, and the oil hole is connected to the lower cavity of the priority valve through the peripheral surface of the diverter valve core.

[0011] The new priority valve also includes a reversing valve assembly; the valve body is also provided with a reversing channel running through the steering oil chamber, and both sides of the middle section of the reversing channel are connected with steering channels for connecting to a steering oil pump; the reversing valve assembly includes a reversing valve core, an oil inlet and return joint and a reversing spring; the reversing valve core is arranged in the reversing channel for opening and closing the connection between the reversing channel and the steering channel; oil inlet and return joints are arranged at both ends of the reversing channel for connecting to the output end of the full hydraulic reversing device; a reversing spring is arranged between the two oil inlet and return joints and the corresponding ends of the reversing valve core.

[0012] Preferably, an oil return passage is provided in the valve body; the oil inlet chamber is communicated with the reversing channel and the oil return passage respectively; and a throttling hole communicated with the oil return passage is provided at the end of the reversing valve core.

[0013] Preferably, one end of the throttling hole is connected to the end surface of the reversing valve core, and the circumferential surface of the other end thereof is connected to the circumferential surface of the reversing valve core through a plurality of through holes.

[0014] Preferably, a throttle valve core is arranged in the throttle hole.

[0015] After adopting the above technical solution, the utility model has the following technical effects:

[0016] The utility model can reduce the oil inlet pressure area in the lower chamber of the priority valve by arranging a diverter valve stem in the lower chamber of the priority valve. When the steering pressure increases, since the oil inlet pressure area of ​​the lower chamber of the priority valve is smaller than that of the upper chamber of the priority valve, the increase ranges of the forces acting on the diverter valve core are inconsistent, and the latter is higher than the former. Then, the diverter valve core will begin to move downward under the pressure difference between the upper chamber of the priority valve and the lower chamber of the priority valve and the elastic force of the diverter spring, so that the opening of the priority valve assembly decreases, and the hydraulic oil output by the steering oil pump returns to the oil through the diversion of the priority valve assembly, the flow rate decreases, and the flow rate supplied to the steering hydraulic system increases, which can reduce the influence of the steering pressure on the flow rate of the steering hydraulic system, and further ensure that the higher the steering pressure, the greater the flow rate supplied to the steering hydraulic system, the lower the steering wheel rotation speed, and the easier the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a fully open state of a specific embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the opening reduction state of a specific embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of a right-turning state of a specific embodiment of the utility model;

[0020] Description of Figure Numbers:

[0021] 1-valve body; 11-oil inlet chamber; 12-diverter channel; 13-steering oil chamber; 14-working oil chamber; 15-reversing channel; 16-steering channel; 17-return oil channel;

[0022] 2-priority valve assembly; 21-diverter valve core; 211-oil return hole; 212-oil through hole; 22-diverter spring; 23-diverter valve stem; 231-limiting piece; 24-first plug; 25-second plug; 251-movable groove; 26-sealing plug; 27-pilot valve seat; 28-pilot valve core; 29-pilot valve spring;

[0023] 3- reversing valve assembly; 31- reversing valve core; 311- throttle hole; 32- oil inlet and return joint; 33- reversing spring; 34- throttle valve core;

[0024] a-priority valve upper chamber; b-priority valve lower chamber. DETAILED DESCRIPTION

[0025] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0026] refer to Figures 1 to 3 As shown, the utility model discloses a novel priority valve, comprising a valve body 1 and a priority valve assembly 2;

[0027] The valve body 1 is provided with an oil inlet chamber 11, a flow diversion channel 12, a steering oil chamber 13 and a working oil chamber 14; the oil inlet chamber 11 is directly connected to the steering oil chamber 13, and is connected to the working oil chamber 14 through the flow diversion channel 12;

[0028] The priority valve assembly 2 includes a diverter valve core 21, a diverter spring 22 and a diverter valve stem 23; the diverter valve core 21 is arranged in the diverter channel 12, and is used to control the flow entering the working oil chamber 14, and its two ends and the two ends of the diverter channel 12 respectively form a priority valve upper chamber a and a priority valve lower chamber b; the diverter spring 22 is arranged in the priority valve upper chamber a, and is used to provide elastic force to drive the diverter valve core 21 to close the priority valve assembly 2, that is, to reduce the opening between the diverter valve core 21 and the diverter channel 12, so that the flow entering the working oil chamber 14 becomes less; the diverter valve stem 23 is arranged in the priority valve lower chamber b, and the lower end of the diverter valve core 21 is sleeved on the diverter valve stem 23.

[0029] Through the above scheme, the utility model can reduce the oil inlet pressure area in the lower chamber b of the priority valve by arranging a diverter valve stem 23 in the lower chamber b of the priority valve. When the steering pressure of the machine increases, since the oil inlet pressure area of ​​the lower chamber b of the priority valve is smaller than that of the upper chamber a of the priority valve, the increase amplitudes of the forces acting on the diverter valve core 21 of the two are inconsistent, and the latter is higher than the former. Then, the diverter valve core 21 will start to move downward under the pressure difference between the upper chamber a and the lower chamber b of the priority valve and the elastic force of the diverter spring 22, so that the opening of the priority valve assembly 2 decreases, and the hydraulic oil output by the steering oil pump returns to the oil through the diversion of the priority valve assembly 2, the flow rate decreases, and the flow rate supplied to the steering hydraulic system increases, which can reduce the influence of the steering pressure on the flow rate of the steering hydraulic system, and thus the higher the steering pressure, the greater the flow rate supplied to the steering hydraulic system, the lower the steering wheel rotation speed, and the easier the operation.

[0030] Specific embodiments of the present utility model are shown below.

[0031] Both ends of the above-mentioned diverter channel 12 penetrate to the surface of the valve body 1; the priority valve assembly 2 also includes a first plug 24, a second plug 25 and a sealing plug 26; the first plug 24 and the second plug 25 are respectively sealed and fitted at the two ends of the diverter channel 12, and form the above-mentioned priority valve upper chamber a and priority valve lower chamber b between the two ends of the diverter valve core 21; the two ends of the diverter spring 22 respectively abut the ends of the first plug 24 and the diverter valve core 21; a movable groove 251 is arranged in the second plug 25; one end of the diverter valve stem 23 is movably fitted in the movable groove 251 and is provided with a limiting plate 231, and the other end thereof passes through the bottom of the movable groove 251 and the end of the diverter valve core 21 in turn, and the limiting plate 231 can prevent the diverter valve stem 23 from falling out from the bottom of the movable groove 251; the sealing plug 26 seals the opening of the movable groove 251.

[0032] The diverter valve core 21 is provided with an oil return hole 211 at one end close to the diverter spring 22; the oil return hole 211 connects the peripheral surface of the diverter valve core 21 to the upper chamber a of the priority valve, in which a pilot valve seat 27, a pilot valve core 28 and a pilot valve spring 29 are provided, and the pilot valve core 28 movably seals the opening of the pilot valve seat 27 under the elastic force of the pilot valve spring 29. When the pressure in the upper chamber a of the priority valve rises to a certain level, oil return can be achieved by opening the pilot valve.

[0033] The lower end of the diverter valve core 21 is provided with an oil hole 212 , which is connected to the priority valve lower chamber b through the circumference of the diverter valve core 21 , so that the oil inlet of the valve body 1 can enter the priority valve lower chamber b.

[0034] The utility model also includes a reversing valve assembly 3; the valve body 1 is also provided with a reversing channel 15 that penetrates the steering oil chamber 13, and both sides of the middle section of the reversing channel 15 are connected with the steering channel 16 for connecting with the steering oil pump; the reversing valve assembly 3 includes a reversing valve core 31, an oil inlet and return joint 32 and a reversing spring 33; the reversing valve core 31 is arranged in the reversing channel 15, and is used to open and close the connection between the reversing channel 15 and the steering channel 16; both ends of the reversing channel 15 are provided with oil inlet and return joints 32, which are used to connect with the output end of the full hydraulic reversing device; a reversing spring 33 is arranged between the two oil inlet and return joints 32 and the corresponding ends of the reversing valve core 31, and the two reversing springs 33 enable the reversing valve core 31 to simultaneously close the connection between the reversing channel 15 and the steering channels 16 on both sides when the machine is not turning. By directly arranging the reversing valve assembly 3 in the valve body 1, the hydraulic oil output by the steering oil pump flows directly in the valve body 1 and can return oil in the valve body 1, thereby avoiding pressure loss along the pipeline when flowing, and also saving the cumbersome operation and cost of pipeline connection; see Figure 3 When the machine turns (taking right turn as an example), the pressure in the corresponding oil inlet and return joint 32 increases, making the pressure at both ends of the reversing valve core 31 inconsistent, pushing the reversing valve core 31 to move to the other end, thereby opening the reversing channel 15 and the steering channel 16 on the corresponding side, and the hydraulic oil in the oil inlet chamber 11 flows more to the steering channel 16, making the driver's operation more labor-saving.

[0035] Furthermore, an oil return passage 17 is provided in the valve body 1; the oil inlet chamber 11 is connected to the reversing passage 15 and the oil return passage 17 respectively, specifically, the oil inlet chamber 11 is connected to the oil return passage 17 through the diverter passage 12; and a throttle hole 311 connected to the oil return passage 17 is provided at the end of the reversing valve core 31. Under the action of the throttle hole 311, the hydraulic oil output by the full hydraulic reversing device can be returned in a small amount through the throttle hole 311 after entering the oil inlet and return joint 32, and when the pressure of the steering hydraulic system increases, the pressure in the oil inlet and return joint 32 can be increased, thereby pushing the reversing valve core 31 to move. In this embodiment, one end of the throttle hole 311 is connected to the end face of the reversing valve core 31, and the peripheral surface of the other end is connected to the peripheral surface of the reversing valve core 31 through a plurality of through holes 312.

[0036] At the same time, a throttle valve core 34 is arranged in the throttle hole 311, so that the flow of the throttle hole 311 is controllable, and different types of throttle valve cores 34 can be replaced according to different product design requirements.

[0037] In addition, both ends of the above-mentioned reversing channel 15 penetrate the surface of the valve body 1, that is, the oil inlet and return joints 32 are installed on the two sides of the valve body 1, which facilitates the connection between the oil inlet and return joints 32 and the full hydraulic reversing device.

[0038] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A new type of priority valve, characterized by: Includes valve body and priority valve assembly; The valve body is provided with an oil inlet chamber, a flow diversion channel, a steering oil chamber and a working oil chamber; the oil inlet chamber is directly connected to the steering oil chamber, and is connected to the working oil chamber through the flow diversion channel; The priority valve assembly includes a diverter valve core, a diverter spring and a diverter valve stem; the diverter valve core is arranged in the diverter channel, and is used to control the flow entering the working oil chamber, and the two ends of the diverter valve core and the two ends of the diverter channel respectively form a priority valve upper chamber and a priority valve lower chamber; the diverter spring is arranged in the priority valve upper chamber; the diverter valve stem is arranged in the priority valve lower chamber, and the lower end of the diverter valve core is sleeved on the diverter valve stem.

2. The novel priority valve according to claim 1 is characterized in that: Both ends of the diverter channel penetrate to the surface of the valve body; the priority valve assembly also includes a first plug, a second plug and a sealing plug; the first plug and the second plug are respectively sealed and fitted at the two ends of the diverter channel, and form the priority valve upper chamber and the priority valve lower chamber between the two ends of the diverter valve core; the two ends of the diverter spring respectively abut the first plug and the end of the diverter valve core.

3. The new priority valve according to claim 2 is characterized in that: A movable groove is provided in the second plug; one end of the diverter valve stem is movably fitted in the movable groove and is provided with a limiting plate, and the other end thereof passes through the bottom of the movable groove and the end of the diverter valve core in sequence; the sealing plug seals the opening of the movable groove.

4. The novel priority valve according to claim 1 is characterized in that: An oil return hole is provided at one end of the diverter valve core close to the diverter spring; the oil return hole connects the circumferential surface of the diverter valve core to the upper chamber of the priority valve, in which a pilot valve seat, a pilot valve core and a pilot valve spring are provided, and the pilot valve core movably seals the opening of the pilot valve seat under the elastic force of the pilot valve spring.

5. The new priority valve according to claim 1 is characterized in that: An oil hole is provided at the lower end of the diverter valve core, and the oil hole is connected to the lower cavity of the priority valve through the peripheral surface of the diverter valve core.

6. The novel priority valve according to claim 1 is characterized in that: It also includes a reversing valve assembly; the valve body is also provided with a reversing channel running through the steering oil chamber, and both sides of the middle section of the reversing channel are connected with steering channels for connecting to a steering oil pump; the reversing valve assembly includes a reversing valve core, an oil inlet and return joint and a reversing spring; the reversing valve core is arranged in the reversing channel for opening and closing the connection between the reversing channel and the steering channel; oil inlet and return joints are arranged at both ends of the reversing channel for connecting to the output end of the full hydraulic reversing device; a reversing spring is arranged between the two oil inlet and return joints and the corresponding ends of the reversing valve core.

7. The new priority valve according to claim 6 is characterized in that: An oil return passage is arranged in the valve body; the oil inlet chamber is communicated with the reversing passage and the oil return passage respectively; a throttling hole communicated with the oil return passage is arranged at the end of the reversing valve core.

8. The new priority valve according to claim 7, characterized in that: One end of the throttling hole is connected to the end surface of the reversing valve core, and the peripheral surface of the other end of the throttling hole is connected to the peripheral surface of the reversing valve core through a plurality of through holes.

9. The novel priority valve according to claim 7, characterized in that: A throttling valve core is arranged in the throttling hole.

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