Hydraulic motor rear cover integrated with flush valve

Abstract

The utility model discloses a hydraulic motor rear cover integrated with a flush valve, which comprises an A-port working oil duct, a B-port working oil duct, two oil inlet ducts, a flush containing cavity and a flush oil duct, the front ends of the two oil inlet ducts are respectively connected with the A-port working oil duct and the B-port working oil duct of a hydraulic motor, and the flush oil duct is used for being connected with a cavity of the hydraulic motor. A reversing valve which is opened and closed based on the oil pressure difference in the two oil inlet channels is arranged between the rear ends of the two oil inlet channels and the flushing containing cavity, and a flushing valve which controls the flushing flow and on-off based on the pressure difference between the flushing containing cavity and the flushing oil channel is arranged between the flushing containing cavity and the flushing oil channel. The hydraulic motor is compact in overall structure, the reversing valve and the flushing valve are arranged, control over reversing and flushing flow and on-off is achieved through the oil hydraulic pressure difference, the flushing effect is improved, and reliable operation of the hydraulic motor is guaranteed.

Description

Technical Field

[0001] The utility model relates to a hydraulic motor rear cover integrated with a flushing valve. Background Art

[0002] In modern industrial hydraulic systems, hydraulic motors, as core power components, are widely used in high-load applications such as construction machinery, mining equipment, and ship propulsion. These motors often operate under demanding conditions, often subject to sustained high pressure (up to 45 MPa and above) and extreme heavy loads. To meet the demands of efficient operation, their speeds are constantly increasing. Under these conditions, mechanical friction and volumetric losses within the system generate significant heat, causing the operating oil temperature to rise sharply. If this heat cannot be dissipated promptly, the oil viscosity decreases, lubrication performance deteriorates, seal aging and failure accelerates, and in severe cases, bearing erosion or even motor seizure occurs.

[0003] The flushing valve is a key component in the hydraulic system used to control the oil flushing circuit. When working in conjunction with the hydraulic motor, it senses the pressure changes at the high and low pressure oil ports of the motor, controls the flow of the flushing oil, and promptly drains the high-temperature oil generated inside the motor due to friction, and introduces low-temperature oil for replacement, thereby achieving cooling of the motor housing cavity and flushing of high-speed rotating components.

[0004] Existing flushing valves have certain limitations in structure and performance: from a structural point of view, they do not adopt an integrated design, and require additional space during installation, resulting in an overall system structure that is not compact enough; from a performance point of view, on the one hand, their flow rate is small, and they cannot quickly replace high-temperature oil, causing heat energy to accumulate in the circuit, making it difficult to match the instantaneous heat dissipation requirements of high-pressure, high-speed motors; on the other hand, the valve core has a delayed response, and when the motor load suddenly changes or the high and low pressure oil ports are switched, the drainage channel cannot be opened in time, increasing the risk of local oil overheating; in addition, the valve cores of some existing flushing valves may become stuck during frequent switching, affecting the stable performance of the flushing function, and may lack a dedicated pressure monitoring structure, making it inconvenient to grasp the pressure status in the system in real time, making it difficult to ensure the reliability and service life of the motor under high pressure, heavy load and high-speed operation. Utility Model Content

[0005] In response to the above problems, the utility model provides a hydraulic motor rear cover with an integrated flushing valve. The overall structure is compact. By setting a reversing valve and a flushing valve, the oil pressure difference is used to realize reversing and flushing flow and on-off control, thereby improving the flushing effect and ensuring the reliable operation of the hydraulic motor.

[0006] The utility model discloses a hydraulic motor rear cover integrated with a flushing valve, comprising an A-port working oil passage and a B-port working oil passage. In addition, it also comprises two oil inlet passages, a flushing cavity and a flushing oil passage. The front ends of the two oil inlet passages are respectively connected to the A-port working oil passage and the B-port working oil passage of the hydraulic motor. The flushing oil passage is used to be connected to the cavity of the hydraulic motor. A reversing valve which opens and closes based on the oil pressure difference in the two oil inlet passages is provided between the rear ends of the two oil inlet passages and the flushing cavity. When the reversing valve is opened, the oil inlet passage with higher pressure is connected to the flushing cavity, and the oil in the oil inlet passage flows to the flushing cavity. A flushing valve which controls the flushing flow and on-off based on the pressure difference between the flushing cavity and the flushing oil passage is provided between the flushing cavity and the flushing oil passage. When the flushing valve is opened, the oil in the flushing cavity flows to the flushing oil passage, and flows into the motor cavity through the flushing oil passage, thereby realizing oil flushing.

[0007] The reversing valve and flushing valve are integrated on the rear cover of the hydraulic motor, and no external pipeline is required. The reversing valve realizes reversal according to the oil pressure difference between the working oil channels of ports A and B corresponding to the oil inlet channels, allowing high-pressure oil to enter the flushing chamber. The flushing flow and on-off are controlled by the flushing valve according to the pressure difference between the flushing chamber and the flushing oil channel, thereby realizing efficient flushing and heat dissipation of the hydraulic motor cavity, with fast response, and ensuring the reliability of the hydraulic motor operation.

[0008] Furthermore, the reversing valve includes a valve core cavity, a valve core hole connected to the two ends of the valve core cavity, a valve core rod, and a valve core connected to the two ends of the valve core rod. The rear ends of the two oil inlet channels are respectively connected to the two valve core holes. The valve core is movably arranged between the rear end of the oil inlet channel and the valve core hole and is used to control the connection or disconnection between the oil inlet channel and the valve core hole. The rear cover is provided with a spring cavity at each end of the valve core rod. A first spring is provided in the spring cavity for pushing the valve core rod to return to the center direction. Spring seats are provided at both ends of the valve core rod for abutting against the first spring. An oil introduction channel is connected between the spring cavity and the oil inlet channel.

[0009] By arranging a first spring in the spring chamber at both ends of the valve core rod and using the oil introduction channel to introduce the oil in the oil inlet channel into the spring chamber, the valve core rod overcomes the spring force and moves axially under the action of the oil pressure differential of the oil inlet channels at both ends, driving the valve core to control the opening and closing of the oil inlet channel and the valve core chamber, thereby realizing the connection between the high-pressure oil channel and the flushing chamber. The arrangement of the first spring can ensure that the valve core rod automatically resets to the middle position when the pressure differential disappears, and the valve core, valve core rod and other components of the reversing valve can quickly respond to the reversing according to the oil channel pressure differential, thereby ensuring the reliable operation of the flushing system.

[0010] Furthermore, the oil introduction channel includes a pressure equalizing groove arranged on the valve core and a throttling groove connected to the pressure equalizing groove. The pressure equalizing groove is circumferentially arranged on the outer side of the valve core. There are multiple throttling grooves, which are evenly distributed along the circumference of the valve core. The throttling groove is extended axially along the valve core to improve the flow effect of the oil. A fast control response channel is also connected between the spring chamber and the oil inlet channel. The setting of the fast control response channel can speed up the flow speed of the oil and improve the response efficiency of the valve core to changes in the oil pressure differential.

[0011] Furthermore, a guide cone ring is provided around the outer edge of the axial side wall of the pressure-equalizing groove corresponding to the spring chamber. During the resetting movement of the reversing valve core, the guide cone ring can serve as a guide, preventing the valve core and the valve core hole from becoming stuck due to fitting accuracy errors, thereby improving the resetting effect of the valve core.

[0012] Furthermore, the rear cover is provided with a first pressure measuring port connected to the two oil inlet passages respectively, and a second pressure measuring port connected to the valve core cavity. The first pressure measuring port and the second pressure measuring port are connected to the first and second screw plugs respectively.

[0013] After removing the first and second screw plugs, monitoring devices can be installed at the first and second pressure measuring ports to detect the oil pressure in the two oil inlet channels and the valve core cavity in real time, which is convenient for grasping the system pressure status. The first and second screw plugs are used to close the first and second pressure measuring ports when not monitoring to prevent oil leakage.

[0014] Furthermore, the rear cover is provided with a first mounting port connected to the spring cavity, and a third screw plug is connected to the first mounting port. The third screw plug and the first spring are in abutment and support cooperation, which facilitates the processing and forming of the spring cavity and the assembly of the first spring and the spring seat.

[0015] Furthermore, the flushing valve includes a flushing valve chamber connected between the flushing chamber and the flushing oil channel, a flushing valve core movably arranged in the flushing valve chamber, a second spring for driving the flushing valve core to reset in the closing direction, a flushing valve hole provided in the flushing valve chamber for sliding and opening and closing with the flushing valve core, a rear cover provided with a second mounting port connected to the flushing valve hole, a fourth screw plug connected to the second mounting port, and the fourth screw plug for adjusting the preload force of the second spring.

[0016] During operation, the oil pressure in the flushing chamber pushes the flushing valve core to overcome the force of the second spring and move, thereby opening the flushing valve hole, and the oil enters the motor cavity through the flushing oil channel. The second spring drives the flushing valve core to reset and close when the oil pressure in the flushing chamber is insufficient. By adjusting the pre-tightening force of the second spring by adjusting the fourth screw plug, the opening pressure of the flushing valve can be adjusted to achieve regulation of the flushing flow.

[0017] Furthermore, one end of the flushing valve core includes a central hole through which oil can pass, a damping plate is fixedly installed at the inlet end of the central hole by an elastic retaining spring, a through hole is provided at the center position of the damping plate, the elastic retaining spring is fixed between the four sides of the damping plate and the inner wall of the central hole, a plurality of oil holes connected to the outlet end of the central hole are provided around the outer side of the flushing valve core, the oil holes and the inner wall of the flushing valve hole cooperate to open and close, and a pressure sensing hole connected to the outlet end of the central hole is provided at the other end of the flushing valve core.

[0018] The oil in the flushing chamber enters the center hole through the through hole of the damping plate. The damping plate has a regulating effect on the flow rate of the oil entering the center hole. A part of the oil will flow to the other end of the flushing valve core through the pressure-sensing hole. When the oil pressure at one end of the flushing valve core is greater than the sum of the oil pressure at the other end and the force of the second spring, the flushing valve core is pushed to move, so that multiple oil holes are opened, and the oil pressure flows to the flushing oil channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The usage state of the embodiment of the utility model Figure 1 ;

[0020] Figure 2 The usage state of the embodiment of the utility model Figure 2 ;

[0021] Figure 3 This is a cross-sectional view of the reversing valve in the closed state according to an embodiment of the present utility model;

[0022] Figure 4 for Figure 3 A partial enlarged view of

[0023] Figure 5 This is a cross-sectional view of the reversing valve in the open state according to an embodiment of the present utility model;

[0024] Figure 6 This is a cross-sectional view of the flush valve in the closed state according to an embodiment of the present utility model;

[0025] Figure 7 This is a cross-sectional view of the flush valve in the open state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The embodiment of the hydraulic motor rear cover integrated with the flushing valve of the utility model is as follows: Figure 1-7As shown, it includes an A-port working oil channel 11 and a B-port working oil channel 12. In addition, it also includes two oil inlet channels 13, a flushing cavity 14, and a flushing oil channel 15. The front ends of the two oil inlet channels 13 are respectively connected to the A-port working oil channel 11 and the B-port working oil channel 12 of the hydraulic motor. The flushing oil channel 15 is used to connect to the cavity of the hydraulic motor. A reversing valve that opens and closes based on the oil pressure difference in the two oil inlet channels 13 is arranged between the rear ends of the two oil inlet channels 13 and the flushing cavity 14. When the reversing valve is opened, the oil inlet channel 13 with higher pressure is connected to the flushing cavity 14, and the oil in the oil inlet channel 13 flows to the flushing cavity 14. A flushing valve that controls the flushing flow and on-off based on the pressure difference between the flushing cavity 14 and the flushing oil channel 15 is arranged between the flushing cavity 14 and the flushing oil channel 15. When the flushing valve is opened, the oil in the flushing cavity 14 flows to the flushing oil channel 15, and flows into the motor cavity through the flushing oil channel 15, thereby realizing oil flushing.

[0027] The reversing valve and flushing valve are integrated on the rear cover of the hydraulic motor, and no external pipeline is required. The reversing valve realizes reversal according to the oil pressure difference between the working oil channels 12 of the A and B ports and the corresponding oil inlet channel 13, so that the high-pressure oil enters the flushing chamber 14. The flushing flow and on-off are controlled by the flushing valve according to the pressure difference between the flushing chamber 14 and the flushing oil channel 15, thereby realizing efficient flushing and heat dissipation of the hydraulic motor cavity, with fast response, and ensuring the reliability of the hydraulic motor operation.

[0028] The reversing valve includes a valve core chamber 21, a valve core hole 22 connected to the two ends of the valve core chamber 21, a valve core rod 23, and a valve core 24 connected to the two ends of the valve core rod 23. The rear ends of the two oil inlet passages 13 are respectively connected to the two valve core holes 22. The valve core 24 is movably arranged between the rear end of the oil inlet passage 13 and the valve core hole 22 and is used to control the connection or disconnection of the oil inlet passage 13 and the valve core hole 22. The rear cover is provided with a spring chamber 25 at each end of the valve core rod 23. A first spring 26 is provided in the spring chamber 25 for pushing the valve core rod 23 to return to the center direction. Spring seats 27 are provided at both ends of the valve core rod 23 to abut against the first spring 26. An oil introduction channel is connected between the spring chamber 25 and the oil inlet passage 13.

[0029] By arranging a first spring 26 in the spring chambers 25 at both ends of the valve core rod 23, and using the oil introduction channel to introduce the oil from the oil inlet channel 13 into the spring chamber 25, the valve core rod 23 overcomes the spring force and moves axially under the action of the oil pressure differential of the oil inlet channel 13 at both ends, driving the valve core 24 to control the connection and disconnection of the oil inlet channel 13 and the valve core chamber 21, thereby realizing the connection between the high-pressure oil channel and the flushing chamber 14. The arrangement of the first spring 26 can ensure that the valve core rod 23 automatically resets to the middle position when the pressure differential disappears, and the valve core, valve core rod and other components of the reversing valve can quickly respond to the reversing according to the oil channel pressure differential, thereby ensuring the reliable operation of the flushing system.

[0030] The oil introduction channel includes a pressure equalizing groove 241 arranged on the valve core 24 and a throttling groove 242 connected to the pressure equalizing groove 241. The pressure equalizing groove 241 is circumferentially arranged on the outer side of the valve core 24. There are multiple throttling grooves 242, which are evenly distributed along the circumference of the valve core 24. The throttling groove 242 is extended along the axial direction of the valve core 24. Part of the oil in the oil inlet channel 13 can enter the spring cavity 25 along the pressure equalizing groove 241 and the throttling groove 242 in sequence, which can improve the oil flow effect. A fast control response channel 16 is also connected between the spring cavity and the oil inlet channel. The setting of the fast control response channel 16 can speed up the oil flow speed and improve the response efficiency of the valve core to changes in oil pressure differential. The fast control response channel 16 is a hole groove opened between the oil inlet channel 13 and the side wall of the spring cavity 25.

[0031] A guide cone ring 243 is provided around the outer edge of the axial side wall of the pressure equalizing groove 241 corresponding to the spring cavity 25. The guide cone ring 243 serves as a guide during the resetting movement of the reversing valve core 24, preventing the valve core 24 from getting stuck in the valve core hole 22 due to fitting accuracy errors, thereby improving the resetting effect of the valve core 24.

[0032] The rear cover is provided with a first pressure measuring port connected to the two oil inlet passages 13 and a second pressure measuring port connected to the valve core cavity 21. The first pressure measuring port and the second pressure measuring port are connected to a first screw plug 31 and a second screw plug 32 respectively.

[0033] After removing the first and second screw plugs, monitoring devices can be installed at the first and second pressure measuring ports to detect the oil pressure in the two oil inlet channels 13 and the valve core chamber 21 in real time, which is convenient for grasping the system pressure status. The first and second screw plugs are used to close the first and second pressure measuring ports when not monitoring to prevent oil leakage.

[0034] The rear cover is provided with a first mounting port connected to the spring cavity 25 , and a third screw plug 33 is connected to the first mounting port. The third screw plug 33 and the first spring 26 are in abutment and support cooperation, which facilitates the processing and forming of the spring cavity 25 and the assembly of the first spring 26 and the spring seat 27 .

[0035] The flushing valve includes a flushing valve chamber 41 connected between the flushing chamber 14 and the flushing oil channel 15, a flushing valve core 42 movably arranged in the flushing valve chamber 41, a second spring 43 for driving the flushing valve core 42 to reset in the closing direction, a flushing valve hole 411 provided in the flushing valve chamber 41 for sliding and opening and closing with the flushing valve core 42, and a rear cover provided with a second mounting port connected to the flushing valve hole 411, and a fourth screw plug 34 is connected to the second mounting port, and the fourth screw plug 34 is used to adjust the preload force of the second spring 43.

[0036] During operation, the oil pressure in the flushing chamber 14 pushes the flushing valve core 42 to overcome the force of the second spring and move, thereby opening the flushing valve hole 411, and the oil enters the motor cavity through the flushing oil channel 15. The second spring 43 drives the flushing valve core 42 to reset and close when the oil pressure in the flushing chamber is insufficient. By adjusting the pre-tightening force of the second spring 43 by the fourth screw plug 34, the opening pressure of the flushing valve can be adjusted to achieve regulation of the flushing flow.

[0037] One end of the flushing valve core 42 includes a center hole 421 through which oil can pass. A damping plate 422 is fixedly installed at the inlet end of the center hole 421 through an elastic retaining spring. The elastic retaining spring is fixed between the four sides of the damping plate 422 and the inner wall of the center hole 421. A through hole is provided on the damping plate 422. A plurality of oil holes 423 connected to the outlet end of the center hole 421 are provided around the outer side of the flushing valve core 42. The oil holes 423 and the inner wall of the flushing valve hole 411 cooperate to open and close. The other end of the flushing valve core 42 is provided with a pressure sensing hole 424 connected to the outlet end of the center hole 421.

[0038] The oil in the flushing chamber 14 enters the center hole 421 through the through hole of the damping plate 422. The damping plate 422 has a regulating effect on the flow rate of the oil entering the center hole 421. A part of the oil will flow to the other end of the flushing valve core 42 through the pressure sensing hole 424. When the oil pressure at one end of the flushing valve core 42 is greater than the sum of the oil pressure at the other end and the force of the second spring 43, the flushing valve core 42 is pushed to move, so that multiple oil holes 423 are opened, and the oil pressure flows to the flushing oil channel.

[0039] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A hydraulic motor rear cover with an integrated flushing valve, including an A-port working oil passage and a B-port working oil passage, characterized in that: It also includes two oil inlet channels, a flushing cavity, and a flushing oil channel. The front ends of the two oil inlet channels are respectively connected to the A-port working oil channel and the B-port working oil channel of the hydraulic motor. The flushing oil channel is used to connect to the cavity of the hydraulic motor. A reversing valve that opens and closes based on the oil pressure difference in the two oil inlet channels is provided between the rear ends of the two oil inlet channels and the flushing cavity. A flushing valve that controls the flushing flow and on-off based on the pressure difference between the flushing cavity and the flushing oil channel is provided between the flushing cavity and the flushing oil channel.

2. The hydraulic motor rear cover with integrated flush valve according to claim 1, characterized in that: The reversing valve includes a valve core cavity, a valve core hole connected to the two ends of the valve core cavity, a valve core rod, and a valve core connected to the two ends of the valve core rod. The rear ends of the two oil inlet channels are respectively connected to the two valve core holes. The valve core is movably arranged between the rear end of the oil inlet channel and the valve core hole and is used to control the connection or disconnection between the oil inlet channel and the valve core hole. The rear cover is provided with a spring cavity at each end of the valve core rod. A first spring is provided in the spring cavity for pushing the valve core rod to return to the center direction. Spring seats are provided at both ends of the valve core rod for abutting and cooperating with the first spring. An oil introduction channel is connected between the spring cavity and the oil inlet channel.

3. The hydraulic motor rear cover with integrated flush valve according to claim 2, characterized in that: The oil introduction channel includes a pressure equalizing groove arranged on the valve core and a throttle groove connected to the pressure equalizing groove. A fast control response channel is also connected between the spring chamber and the oil inlet channel.

4. The hydraulic motor rear cover with integrated flush valve according to claim 3, characterized in that: A guide cone ring is provided on the outer edge of the side wall of the pressure equalizing groove on one axial side corresponding to the spring cavity.

5. The hydraulic motor rear cover with integrated flush valve according to claim 2, characterized in that: The rear cover is provided with a first pressure measuring port connected to the two oil inlet passages and a second pressure measuring port connected to the valve core cavity. The first pressure measuring port and the second pressure measuring port are connected to the first and second screw plugs respectively.

6. The hydraulic motor rear cover with integrated flush valve according to claim 2, characterized in that: The rear cover is provided with a first mounting port connected to the spring cavity, the first mounting port is connected to a third screw plug, and the third screw plug is in abutment and support cooperation with the first spring.

7. The hydraulic motor rear cover with integrated flush valve according to claim 1, characterized in that: The flushing valve includes a flushing valve chamber connected between the flushing chamber and the flushing oil channel, a flushing valve core movably arranged in the flushing valve chamber, a second spring for driving the flushing valve core to reset in the closing direction, a flushing valve hole provided in the flushing valve chamber for sliding and opening and closing with the flushing valve core, a rear cover provided with a second mounting port connected to the flushing valve hole, a fourth screw plug connected to the second mounting port, and the fourth screw plug for adjusting the preload force of the second spring.

8. The hydraulic motor rear cover with integrated flush valve according to claim 7, characterized in that: One end of the flushing valve core includes a central hole through which oil can pass, and a damping plate is fixedly installed at the inlet end of the central hole through an elastic retaining spring, and a through hole is provided on the damping plate. A plurality of oil holes connected to the outlet end of the central hole are provided around the outer side of the flushing valve core, and the oil holes and the inner wall of the flushing valve hole cooperate to open and close, and the other end of the flushing valve core is provided with a pressure-sensing hole connected to the outlet end of the central hole.

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