A valve, a separate balancing valve, a travel motor and an engineering machinery device

Abstract

The present application provides a valve, a separate balancing valve, a travel motor and an engineering machinery device. The balancing valve adopts a separate structure, including a first balancing valve and a second balancing valve. The first balancing valve and the second balancing valve respectively control the first oil port and the second oil port. Therefore, the opening and closing time of the first oil port and the second oil port are independent of each other, and the timing performance is better adjusted; the design of the separate structure reduces the length of the balancing valve and reduces the processing difficulty of the balancing valve; and the separate balancing valve only has two states, and does not require a spring to achieve position centering like a traditional balancing valve, thereby reducing the requirements for spring accuracy.

Description

Technical Field

[0001] The present application relates to the field of valve body design, and more specifically, to a valve, a separate balancing valve, a travel motor, and an engineering machinery device. Background Art

[0002] The travel motor's counterbalance valve prevents the main engine from rolling downhill by controlling the opening and closing of the motor's oil ports. The opening and closing of the counterbalance valve is often considered simultaneously with the opening and closing of the brake cylinder to control the release sequence of the hydraulic and mechanical brakes and optimize motor performance.

[0003] The existing balance valve structure on the travel motor mostly adopts a valve stem structure, and its structure is as follows: Figure 1 As shown, one end of the spring 11 is arranged in the screw plug 10, and the other end is connected to the valve seat 12. The two ends of the valve core 13 are respectively in contact with the valve seat 12 and the valve seat 14. One end of the spring 15 is arranged in the screw plug 16, and the other end is connected to the valve seat 14. The balancing valve 1 controls the opening and closing of the oil ports on both sides at the same time through a valve core 13, which makes this balancing valve have high requirements on precision, and the size of the valve core 13 is relatively large, and the processing difficulty is high. Summary of the Invention

[0004] The purpose of this application is to provide a valve, a separate balancing valve, a travel motor and an engineering machinery device, so as to reduce the precision requirements for the balancing valve, reduce the length of the balancing valve and reduce the difficulty of processing.

[0005] In the first aspect, the present application provides a valve, comprising: a valve seat and a valve core; the valve core is a cylindrical structure having a cavity, one end of the cavity is open and the other end away from the opening is closed; an annular groove is provided on the outer surface of the valve core, a throttling hole is provided at the bottom of the annular groove, the throttling hole is connected to the cavity, and one end of the valve core abuts against the valve seat.

[0006] The valve in the embodiment of the present application can be connected to the channel through an annular groove, thereby controlling the opening and closing of the opening on the channel. That is, the valve in the embodiment of the present application can be unaffected by the opening and closing of other openings, and the opening and closing of one opening can be controlled independently, which makes it easy to achieve different opening and closing times for different openings. Moreover, because there is no need to take into account the opening and closing of other openings, the accuracy requirements for the spring are lower. In addition, the length of the valve core is shortened compared to the prior art, so the processing difficulty can be reduced.

[0007] In combination with the technical solution provided in the first aspect above, in some possible implementations, the valve seat has a cavity, one end of the cavity is open, and the other end is provided with a liquid resistance, and the cavity is connected to the cavity through the liquid resistance.

[0008] In combination with the technical solution provided in the first aspect above, in some possible implementations, the valve may further include a screw plug having an inner cavity with an open end; the valve may further include a spring, one end of the spring being arranged in the inner cavity, and the other end of the spring abutting against the valve seat.

[0009] In the second aspect, the present application provides a separate balancing valve, including a first balancing valve and a second balancing valve; the first balancing valve includes a first valve core, the first valve core is used to connect to a first oil port, and the first balancing valve is used to control the opening and closing of the first oil port; the second balancing valve includes a second valve core, the second valve core is used to connect to a second oil port, and the second balancing valve is used to control the opening and closing of the second oil port, wherein the second valve core and the first valve core are physically independent of each other.

[0010] In the embodiments of the present application, the first and second valve cores of the split balancing valve are physically independent of each other. Therefore, the first balancing valve's control of the first oil port and the second balancing valve's control of the second oil port do not need to be simultaneous, and the control durations can be different, making it easier to adjust timing performance. Furthermore, the first and second balancing valves only need to have two states: open and closed, requiring no alignment, thereby reducing the precision requirements for the balancing valves.

[0011] In combination with the technical solution provided in the second aspect above, in some possible implementations, the first balancing valve also includes a first valve seat; the first valve core is a cylindrical structure having a cavity, one end of the cavity is open, and one end of the first valve core opening is in contact with the first valve seat; the other end of the column away from the first valve seat is closed, and a first annular oil groove is provided on the outer wall of the column, and a first throttling hole is provided at the bottom of the groove, the first annular oil groove is connected to the first oil channel, the first oil channel is connected to the first cavity through the first throttling hole, and the first oil channel is also connected to the first oil port.

[0012] The first balancing valve in the embodiment of the present application can be connected to the channel through the first annular groove, thereby controlling the opening and closing of the opening on the channel. That is, the first balancing valve in the embodiment of the present application can be unaffected by the opening and closing of other openings, and can independently control the opening and closing of one opening, thereby facilitating the realization of different opening and closing times for different openings. Moreover, because there is no need to take into account the opening and closing of other openings, the accuracy requirements for the first spring are relatively low. In addition, the length of the first valve core is shortened compared to the prior art, thereby reducing the difficulty of processing.

[0013] In combination with the technical solution provided in the second aspect above, in some possible implementations, the second balancing valve also includes a second valve seat; the second valve core is a cylindrical structure having a cavity, one end of the cavity is open, and one end of the second valve core opening is in contact with the second valve seat; the end of the column away from the second valve seat is closed, and a second annular oil groove is provided on the outer wall of the column, and a second throttling hole is provided at the bottom of the groove, the second annular oil groove is connected to the second oil channel, the second oil channel is connected to the second cavity through the second throttling hole, and the second oil channel is also connected to the second oil port.

[0014] The second balancing valve in the embodiment of the present application can be connected to the channel through the second annular groove, thereby controlling the opening and closing of the opening on the channel. That is, the second balancing valve in the embodiment of the present application can be unaffected by the opening and closing of other openings, and can independently control the opening and closing of one opening, thereby facilitating the realization of different opening and closing times for different openings. Moreover, because there is no need to take into account the opening and closing of other openings, the accuracy requirements for the second spring are relatively low. In addition, the length of the second valve core is shortened compared to the prior art, thereby reducing the difficulty of processing.

[0015] In a third aspect, an embodiment of the present application provides a walking motor, comprising a motor body and a separate balancing valve as described in the second aspect, wherein the separate balancing valve is arranged on the motor body.

[0016] In combination with the technical solution provided in the third aspect above, in some possible implementations, the first balancing valve is further connected to the first oil passage, and the second balancing valve is further connected to the second oil passage.

[0017] In combination with the technical solution provided in the third aspect above, in some possible implementations, the walking motor also includes a first one-way valve and a second one-way valve, the first one-way valve is arranged at the connection point between the first oil channel and the third oil channel, and the first one-way valve is used to block or connect the first oil channel and the third oil channel, and the second one-way valve is arranged at the connection point between the second oil channel and the fourth oil channel, and the second one-way valve is used to block or connect the second oil channel and the fourth oil channel.

[0018] In combination with the technical solution provided in the third aspect above, in some possible implementations, the travel motor also includes an end cover, and the end cover is provided with a first receiving space, a second receiving space, the first oil port, the second oil port, the first oil channel, the second oil channel, the third oil channel, and the fourth oil channel. The first balancing valve is arranged in the first receiving space, and the second balancing valve is arranged in the second receiving space. The other end of the first oil channel is connected to the first oil port, and a through hole is opened on the side wall of the first oil channel at a position corresponding to the cylindrical end surface of the second valve core. The other end of the second oil channel is connected to the second oil port, and a through hole is opened on the side wall of the second oil channel at a position corresponding to the cylindrical end surface of the first valve core. The first oil channel and the second oil channel with through holes are respectively located on both sides of the valve core, the third oil channel passes through the first receiving space, and the fourth oil channel passes through the first receiving space.

[0019] The travel motor in the embodiment of the present application can control the oil ports on both sides separately through a separate balancing valve, thereby achieving different opening and closing times for different openings, making it easier to control the timing performance.

[0020] In a fourth aspect, an embodiment of the present application further provides an engineering machinery device, including an engineering machinery device and a travel motor as described in the third aspect, wherein the travel motor is arranged on the main body and is used to drive the main body to move.

[0021] The engineering machinery device in the embodiment of the present application can control the oil ports on both sides separately through the separate balancing valve of the travel motor, thereby achieving different opening and closing times for different openings, making it easier to control the timing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a structural diagram of a balancing valve in the prior art;

[0024] Figure 2 This is a schematic structural diagram of a valve shown in an embodiment of the present application;

[0025] Figure 3 This is a schematic structural diagram of a separate balancing valve according to an embodiment of the present application;

[0026] Figure 4 A schematic structural diagram of a first balancing valve is shown for an embodiment of the present application;

[0027] Figure 5 A schematic structural diagram of a second balancing valve is shown for an embodiment of the present application;

[0028] Figure 6 A first structural schematic diagram of a travel motor is shown for an embodiment of the present application;

[0029] Figure 7 This is a second structural schematic diagram of the travel motor shown in an embodiment of the present application;

[0030] Figure 8 This is a third structural schematic diagram of the travel motor shown in an embodiment of the present application;

[0031] Figure 9 This is a schematic diagram of a travel motor according to an embodiment of the present application;

[0032] Figure 10 This is a schematic structural diagram of an engineering machinery device shown in an embodiment of the present application.

[0033] Icons: 1-Balancing valve; 10-Screw plug; 11-Spring; 12-Valve seat; 13-Valve core; 14-Valve seat; 15-Spring; 16-Screw plug; 2-Valve; 20-Screw plug; 21-Spring; 22-Valve seat; 23-Valve core; 31-Inner cavity; 32-Liquid resistance; 33-Limiting device; 34-Cavity; 35-Cavity body; 36-Annular groove; 37-Throttle hole; 38-Valve core closed end; 39-Valve core opening; 40-Valve seat opening; 41-Valve core open end; 100-First balancing valve; 101-First screw plug; 102-First spring Spring; 103-first valve seat; 104-first valve core; 131-second cavity; 132-first fluid resistance; 133-first position limiting device; 134-first cavity; 135-first cavity; 136-first annular oil groove; 137-first throttle hole; 138-first valve core closed end; 139-first valve core opening; 140-first valve seat opening; 110-second balancing valve; 111-second screw plug; 112-second spring; 113-second valve seat; 114-second valve core; 141-fourth cavity; 142-second fluid resistance; 1 43-second limit device; 144-third cavity; 145-second cavity; 146-second annular oil groove; 147-second throttle hole; 148-second valve core closed end; 149-second valve core opening; 150-second valve seat opening; 201-first one-way valve; 202-second one-way valve; 301-first oil port; 302-second oil port; 311-first plunger chamber oil port; 312-second plunger chamber oil port; 321-first through hole; 322-second through hole; 401-first oil passage; 402-second oil passage; 411-third Oil channel; 412 - fourth oil channel; 500 - end cover; 501 - first containment space; 502 - second containment space; 601 - counterbalance valve; 602 - counterbalance valve; 603 - shuttle valve; 604 - speed change valve; 605 - variable displacement piston; 606 - brake cylinder; 607 - check valve; 608 - check valve; 609 - variable displacement hydraulic motor; 701 - inlet and outlet oil pressure gauge ports; 702 - inlet and outlet oil pressure gauge ports; 703 - pilot oil port; 704 - leakage oil pressure gauge port; 705 - leakage oil pressure gauge port; 706 - first oil port; 707 - second oil port. DETAILED DESCRIPTION

[0034] The terms "first", "second", "third", etc. are only used to distinguish and describe, and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0036] In the description of this application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0037] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "connect" 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, or it can be a connection between the internal parts of two elements.

[0038] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings.

[0039] See also Figure 2 , is a schematic structural diagram of a valve 2 provided in an embodiment of the present application. The valve 2 includes a valve seat 22 and a valve core 23. The valve core 23 is a cylindrical structure having a cavity 35. One end 41 of the cavity 35 is an opening 39, and the other end 38 of the valve core 23, away from the valve core opening 39, is closed. An annular groove 36 is provided on the outer surface of the valve core 23, and a throttle hole 37 is provided at the bottom of the annular groove 36. The throttle hole 37 communicates with the cavity 35. The valve core opening end 41 of the valve core 23 abuts the valve seat 22.

[0040] Optionally, the column structure may be a cylinder or a prism with a polygonal cross-section.

[0041] Optionally, the annular groove 36 is formed near the end of the valve core 23 away from the valve core opening 39, such as near the valve core closed end 38. This is convenient for the valve 2 to leave enough space for use when it is actually used, and is more convenient to use.

[0042] Please continue reading Figure 2 The valve 2 further includes a screw plug 20. In one embodiment of the screw plug 20, the screw plug 20 has an inner cavity 31 with one end open.

[0043] Please continue reading Figure 2 The valve 2 further includes a spring 21 , one end of which is disposed in the inner cavity 31 of the screw plug 20 , and the other end abuts against the valve seat 22 .

[0044] Please continue reading Figure 2In one embodiment of the valve seat 22 , the valve seat 22 has a cavity 34 , one end 40 of the cavity 34 is open, and a liquid resistor 32 is provided at one end, and the cavity 35 is connected to the cavity 34 through the liquid resistor 32 .

[0045] Optionally, a limit device 33 is provided on the outer surface of the end of the valve seat 22 provided with the fluid resistance 32. Optionally, the other end of the spring 21 abuts against the limit device 33. The limit device 33 and the screw plug 20 cooperate with each other to limit the movement distance L of the valve core 23.

[0046] Optionally, the valve 2 in the embodiment of the present application can be connected to the channel through the annular groove 36, thereby controlling the opening and closing of the opening on the channel, that is, the valve 2 in the embodiment of the present application can be unaffected by the opening and closing of other openings, and can independently control the opening and closing of one opening, thereby facilitating the realization of different opening and closing times for different openings, and because there is no need to take into account the opening and closing of other openings, the accuracy requirements for the spring 21 are lower, and the length of the valve core 23 is shortened compared to the prior art, so the processing difficulty can be reduced.

[0047] Based on the same inventive concept, please refer to Figure 3 and Figure 4 The present invention provides a split balancing valve, including a first balancing valve 100 and a second balancing valve 110. The first balancing valve 100 includes a first valve core 104, which is connected to a first oil port 301 and is used to control the opening and closing of the first oil port 301.

[0048] The second balancing valve 110 includes a second valve core 114, which is connected to the second oil port 302 and is used to control the opening and closing of the second oil port 302. The first valve core 104 and the second valve core 114 are physically independent of each other.

[0049] As can be seen from the above description, because the first spool 104 and second spool 114 of the balancing valve are physically independent, the control of the first oil port 301 by the first balancing valve 100 and the control of the second oil port 302 by the second balancing valve 110 do not need to be simultaneous, and the control durations can also be different, making it easier to adjust timing performance. Furthermore, the first and second balancing valves 100 and 110 only need two states: open and closed, and do not require alignment, thus reducing the precision requirements for the balancing valves.

[0050] Please continue reading Figure 4The first balancing valve 100 also includes a first valve seat 103. The first valve core 104 is a cylindrical structure having a first cavity 135. One end of the first cavity 135 is open 139, and the other end 138 of the first valve core 104, away from the first valve core opening 139, is closed. A first annular oil groove 136 is provided on the outer surface of the first valve core 104, and a first throttle hole 137 is defined at the bottom of the first annular oil groove 136. The first throttle hole 137 communicates with the first cavity 135. The first valve core opening 139 of the first valve core 104 abuts against the first valve seat 103.

[0051] Optionally, the column structure may be a cylinder or a prism with a polygonal cross-section.

[0052] Optionally, the first annular oil groove 136 is opened near the end of the first valve core 104 away from the first valve core opening 139, such as near the first valve core closed end 138. This makes it easier for the first balancing valve 100 to be used in actual use while leaving enough space.

[0053] Please continue reading Figure 4 The first balancing valve 100 further includes a first screw plug 101. In one embodiment of the first screw plug 101, the first screw plug 101 has a second cavity 131 with one end open.

[0054] Please continue reading Figure 4 The first balancing valve 100 further includes a first spring 102 , one end of which is disposed in the second cavity 131 of the first screw plug 101 , and the other end of which abuts against the first valve seat 103 .

[0055] Please continue reading Figure 4 One embodiment of the first valve seat 103 is that the first valve seat 103 has a first cavity 134 , one end of the first cavity 134 is open 140 , and the other end is provided with a first liquid resistor 132 , and the first cavity 135 is connected to the first cavity 134 through the first liquid resistor 132 .

[0056] Optionally, a first limiter 133 is provided on the outer surface of the end of the first valve seat 103 where the first fluid resistor 132 is provided. Optionally, the other end of the first spring 102 abuts against the first limiter 133. The first limiter 133 cooperates with the first screw plug 101 to limit the movement distance L of the first valve core 104.

[0057] Please continue reading Figure 5The second balancing valve 110 also includes a second valve seat 113. The second valve core 114 is a cylindrical structure with a second cavity 145. A second valve core opening 149 is defined at one end of the second cavity 145. The other end 148 of the second valve core 114, away from the second valve core opening 149, is sealed. Furthermore, a second annular oil groove 146 is defined on the outer surface of the second valve core 114. A second throttle hole 147 is defined at the bottom of the second annular oil groove 146. The second throttle hole 147 communicates with the second cavity 145. One end of the second valve core opening 149 of the second valve core 114 abuts the second valve seat 113.

[0058] Optionally, the column structure may be a cylinder or a prism with a polygonal cross-section.

[0059] Optionally, the second annular oil groove 146 is opened near the end of the second valve core 114 away from the second valve core opening 149, for example, near the second valve core closed end 148. This makes it easier for the second balancing valve 110 to leave enough space when actually used, making it more convenient to use.

[0060] Please continue reading Figure 5 The second balancing valve 110 further includes a second screw plug 111. In one embodiment of the second screw plug 111, the second screw plug 111 has a fourth cavity 141 with one end open.

[0061] Please continue reading Figure 5 The second balancing valve 110 further includes a second spring 112 , one end of the second spring 112 is disposed in the fourth cavity 141 of the second screw plug 111 , and the other end abuts against the second valve seat 113 .

[0062] Please continue reading Figure 5 One embodiment of the second valve seat 113 is that the second valve seat 113 has a third cavity 144 , one end 150 of the third cavity 144 is open, and a second liquid resistor 142 is provided at one end, and the second cavity 145 is connected to the third cavity 144 through the second liquid resistor 142 .

[0063] Optionally, a second limiter 143 is provided on the outer surface of the second valve seat 113 at the end provided with the second fluid resistor 142. Optionally, the other end of the second spring 112 abuts against the second limiter 143. The second limiter 143 cooperates with the second screw plug 111 to limit the movement distance L of the second valve core 114.

[0064] See also Figure 6 and Figure 7 The present invention provides a travel motor, which includes a motor body and a separate balancing valve. The structure of the separate balancing valve is described in the above description, which will not be repeated here.

[0065] The first balancing valve 100 is in communication with the first oil port 301 of the motor body and is used to control the opening and closing of the first oil port 301 .

[0066] The second balancing valve 110 is connected to the second oil port 302 of the motor body and is used to control the opening and closing of the second oil port 302, wherein the first oil port 301 is the oil inlet and the second oil port 302 is the oil outlet, or the first oil port 301 is the oil outlet and the second oil port 302 is the oil inlet.

[0067] Please refer to Figure 7 As shown, the first balancing valve 100 is communicated with the first oil port 301 through the first oil passage 401 , and the second balancing valve 110 is communicated with the second oil port 302 through the second oil passage 402 .

[0068] Optionally, the travel motor further includes a first one-way valve 201 and a second one-way valve 202. The first one-way valve 201 is disposed at the connection between the first oil passage 401 and the third oil passage 411, and is used to block or connect the first oil passage 401 and the third oil passage 411. The second one-way valve 202 is disposed at the connection between the second oil passage 402 and the fourth oil passage 412, and is used to block or connect the second oil passage 402 and the fourth oil passage 412. A first through hole 321 is defined on the side wall of the first oil passage 401, corresponding to the cylindrical end surface of the second valve core 114. A second through hole 322 is defined on the side wall of the second oil passage 402, corresponding to the cylindrical end surface of the first valve core 104.

[0069] Please continue to refer to Figure 7 As described, in the embodiment of the present application, the end cover 500 is further provided with a first plunger chamber oil port 311 and a second plunger chamber oil port 312 . The first plunger chamber oil port 311 is connected to the third oil channel 411 , and the second plunger chamber oil port 312 is connected to the fourth oil channel 412 .

[0070] Please continue to refer to Figure 7 As shown, in the embodiment of the present application, when the first oil port 301 is used as the oil inlet, the second oil port 302 is used as the oil return port; when the first oil port 301 is used as the oil return port, the second oil port 302 is used as the oil inlet.

[0071] Please also refer to Figure 4 、 Figure 5 and Figure 7When the first oil port 301 is used as the oil inlet, the hydraulic oil enters from the first oil port 301, and the hydraulic oil enters the first cavity 135 through the first throttle hole 137 set on the first annular oil groove 136, and then enters the first cavity 134 and the second cavity 131 through the first liquid resistance 132, so that the internal oil pressure of the first balancing valve 100 is consistent with the oil pressure of the first oil channel 401, and the first balancing valve 100 is closed; the hydraulic oil in the first oil channel 401 pushes the first check valve 201 to contract, and the first oil channel 401 is connected to the third oil channel 411; the hydraulic oil enters the first plunger chamber oil port 311, and the motor body performs work through the pressure difference between the high-pressure hydraulic oil and the low-pressure hydraulic oil, and the hydraulic oil flows out from the second plunger chamber oil port 312, and the hydraulic oil pressure is reduced. Under the joint action of the spring of 202 itself, the second one-way valve 202 blocks the connection between the second oil channel 402 and the fourth oil channel 412, and the hydraulic oil enters the fourth oil channel 412; when the oil pressure borne by the end 148 of the second balancing valve 110 is greater than the internal oil pressure of the second balancing valve 110, the second balancing valve 110 moves to the right, and the second spring 112 is compressed until the pressure on the second balancing valve 110 is balanced with the elastic force of the second spring 112, or the limit compression distance L is reached. The limit distance L is used to prevent the first oil channel 401 from being connected to the third oil channel 411; the second balancing valve 110 moves to the right to connect the second annular oil groove 146 with the second oil channel 402 and the fourth oil channel 412, and the hydraulic oil enters the second oil channel 402 through the second annular oil groove 146 and flows into the second oil port 302.

[0072] When the second oil passage 402 and the fourth oil passage 412 are connected to form an oil return path, the motor can rotate; when the connection between the second oil passage 402 and the fourth oil passage 412 is blocked, the motor brakes.

[0073] Please also refer to Figure 4 、 Figure 5 and Figure 7, when the first oil port 301 is used as the return oil port, the hydraulic oil enters from the second oil port 302, and the hydraulic oil enters the second cavity 145 through the second throttle hole 147 set on the second annular oil groove 146, and then enters the third cavity 144 and the fourth cavity 141 through the second liquid resistance 142, so that the internal oil pressure of the second balancing valve 110 is consistent with the oil pressure of the second oil channel 402, and the second balancing valve 110 is closed; the hydraulic oil in the second oil channel 402 pushes the second one-way valve 202 to contract, and the second oil channel 402 and the fourth oil channel 412 are connected; the hydraulic oil enters the second plunger chamber oil port 312, and the motor body performs work through the pressure difference between the high-pressure hydraulic oil and the low-pressure hydraulic oil, and the hydraulic oil flows out from the first plunger chamber oil port 311. Under the joint action of the body and the spring, the first one-way valve 201 blocks the connection between the first oil channel 401 and the third oil channel 411, and the hydraulic oil enters the third oil channel 411; when the oil pressure borne by the end 138 of the first balancing valve 100 is greater than the internal oil pressure of the first balancing valve 100, the first balancing valve 100 moves to the left, and the first spring 102 is compressed until the pressure on the first balancing valve 100 is balanced with the elastic force of the first spring 102, or the limit compression distance L is reached. The limit compression distance L is used to prevent the second oil channel 402 from being connected to the fourth oil channel 412; the first balancing valve 100 moves to the left to connect the first annular oil groove 136 to the first oil channel 401 and the third oil channel 411, and the hydraulic oil enters the first oil channel 401 through the first annular oil groove 136 and flows into the first oil port 301.

[0074] When the first oil passage 401 and the third oil passage 411 are connected to form an oil return path, the motor can rotate; when the connection between the first oil passage 401 and the third oil passage 411 is blocked, the motor brakes.

[0075] See also Figure 8 , a schematic diagram of a separate balancing valve provided in an embodiment of the present application, mounted on an end cap 500. The motor body also includes an end cap 500. In one embodiment, the end cap 500 is provided with a first oil port 301, a second oil port 302, a first plunger chamber oil port 311, a second plunger chamber oil port 312, a first oil passage 401, a second oil passage 402, a third oil passage 411, and a fourth oil passage 412. The other end of the second oil passage 402 is connected to the second oil port 302. The first oil passage 401 and the second oil passage 402 are located on either side of the valve core, respectively, with through holes. The end cap 500 also includes a first receiving space 501 and a second receiving space 502. The first balancing valve 100 is disposed in the first receiving space 501, and the second balancing valve 110 is disposed in the second receiving space 502. The third oil passage 411 passes through the first receiving space 501, and the fourth oil passage 412 passes through the first receiving space 502.

[0076] See also Figure 9, which is a schematic diagram of a travel motor provided in an embodiment of the present application. Hydraulic oil enters and exits the variable hydraulic motor 609 through the first oil port 706 and the second oil port 707. The two sides of the balancing valve 601 and the balancing valve 602 are respectively connected to the first oil port 706 and the second oil port 707. The opening and closing of the balancing valve 601 and the balancing valve 602 are controlled by the different oil pressures of the first oil port 706 and the second oil port 707. When the first oil port 706 is a high-pressure oil inlet, the balancing valve 602 is closed under the action of the high-pressure oil in the first oil port 706. At this time, the balancing valve 601 is opened under the action of the high-pressure oil in the first oil port 706. The high-pressure oil enters the variable hydraulic motor 609 through the one-way valve 608, and the low-pressure oil flows out of the variable hydraulic motor 609 and flows out from the second oil port 707 through the balancing valve 601. When the second oil port 707 is the high-pressure oil inlet, the counterbalance valve 601 closes under the action of the high-pressure oil in the second oil port 707. At this time, the counterbalance valve 602 opens under the action of the high-pressure oil in the second oil port 707. The high-pressure oil enters the variable hydraulic motor 609 through the check valve 607. The low-pressure oil flows out of the variable hydraulic motor 609, passes through the counterbalance valve 602, and exits the first oil port 706. After the hydraulic oil in the first and second oil ports 706 and 707 flows through the shuttle valve 603, the high-pressure oil flows into the brake cylinder 606, controlling its opening and closing. Simultaneously, the hydraulic oil enters the control speed valve 604, controlling the motor displacement. The variable piston 605 controls the motor swash plate angle, achieving motor variable speed. Among them, the inlet and outlet oil pressure measuring ports 701 and 702 are used to measure the oil pressure of the hydraulic oil at the corresponding oil ports. The hydraulic oil pressure at the pilot oil port 703 is used to determine the hydraulic oil pressure value that causes the displacement of the variable hydraulic motor 609 to change. 704 and 705 are leakage oil ports, which guide the leaked oil in the shell into the oil tank.

[0077] See also Figure 10 The embodiment of the present application provides an engineering machinery device, which includes an engineering machinery body and a travel motor. The travel motor is provided on the body and is used to drive the body to move.

[0078] The structure and working principle or process of the travel motor have been clearly described in the previous article and will not be repeated here.

[0079] The engineering machinery device in the embodiment of the present application may be, for example, an excavator or a forklift.

[0080] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0081] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A travel motor, characterized in that: include: Motor body; The end cover (500) is provided with a first oil port (301), a second oil port (302), a first oil passage (401), a second oil passage (402), a third oil passage (411), a fourth oil passage (412), a first plunger chamber oil port (311), and a second plunger chamber oil port (312); the first plunger chamber oil port (311) is communicated with the third oil passage (411), the second plunger chamber oil port (312) is communicated with the fourth oil passage (412), hydraulic oil flows into the first plunger chamber oil port (311) and flows out of the second plunger chamber oil port (312), or hydraulic oil flows into the second plunger chamber oil port (312) and flows out of the first plunger chamber oil port (311); A separate balancing valve is provided on the motor body and comprises a first balancing valve (100) and a second balancing valve (110), wherein the first balancing valve (100) comprises a first valve core (104), the first valve core (104) is connected to the first oil port (301) via the first oil passage (401), and the first balancing valve (100) is used to control the opening and closing of the first oil port (301); the second balancing valve (110) comprises a second valve core (114), the second valve core (114) is connected to the second oil port (302) via the second oil passage (402), and the second balancing valve (110) is used to control the opening and closing of the second oil port (302), and the second valve core (114) and the first valve core (104) are physically independent of each other; a first one-way valve (201), provided at the connection point between the first oil passage (401) and the third oil passage (411), for blocking or connecting the first oil passage (401) and the third oil passage (411); a second one-way valve (202), disposed at a connection point between the second oil passage (402) and the fourth oil passage (412), for blocking or connecting the second oil passage (402) and the fourth oil passage (412); a shuttle valve, communicating with the first oil port (301) and the second oil port (302); a brake oil cylinder, connected to the shuttle valve; A hydraulic motor is connected to the first balancing valve (100), the second balancing valve (110), the first one-way valve (201) and the second one-way valve (202).

2. The travel motor according to claim 1, characterized in that: The first balancing valve (100) further comprises a first valve seat (103); the first valve core (104) is a columnar structure having a first cavity (135); one end of the first cavity (135) is an opening (139); one end of the opening (139) of the first valve core (104) abuts against the first valve seat (103); The other end of the column away from the first valve seat (103) is closed, and a first annular oil groove (136) is provided on the outer wall of the column, and a first throttling hole (137) is provided at the bottom of the groove. The first annular oil groove (136) is connected to the first oil channel (401), and the first oil channel (401) is connected to the first cavity (135) through the first throttling hole (137). The first oil channel (401) is also connected to the first oil port (301).

3. The travel motor according to claim 2, characterized in that: The second balancing valve (110) further includes a second valve seat (113); the second valve core (114) is a columnar structure having a second cavity (145); one end of the second cavity (145) is an opening (149); one end of the opening (149) of the second valve core (114) abuts against the second valve seat (113); One end of the column away from the second valve seat (113) is closed, and a second annular oil groove (146) is provided on the outer wall of the column, and a second throttling hole (147) is opened at the bottom of the groove. The second annular oil groove (146) is connected to the second oil channel (402), and the second oil channel (402) is connected to the second cavity (145) through the second throttling hole (147). The second oil channel (402) is also connected to the second oil port (302).

4. The travel motor according to claim 3, characterized in that: The first valve seat (103) has a first cavity (134), one end of the first cavity (134) is open, and the other end is provided with a first liquid resistor (132), and the first cavity (135) is communicated with the first cavity (134) through the first liquid resistor (132); The second valve seat (113) has a second cavity (144). One end of the second cavity (144) is open, and the other end is provided with a second liquid resistor (142). The second cavity (145) is communicated with the second cavity (144) through the second liquid resistor (142).

5. The travel motor according to claim 4, characterized in that: The first balancing valve (100) further includes a first screw plug (101) and a first spring (102), wherein the first screw plug (101) has a first inner cavity (131) with one end open, one end of the first spring (102) is disposed in the first inner cavity (131), and the other end of the first spring (121) abuts against the first valve seat (103); The second balancing valve (110) further includes a second screw plug (111) and a second spring (112). The second screw plug (111) has a second inner cavity (141) with one end open. One end of the second spring (112) is disposed in the second inner cavity (141), and the other end of the second spring (112) abuts against the second valve seat (113).

6. The travel motor according to claim 1, characterized in that: The end cover (500) is further provided with a first receiving space (501) and a second receiving space (502); the first balancing valve (100) is provided in the first receiving space (501); the second balancing valve (110) is provided in the second receiving space (502); a first through hole (321) is provided on the side wall of the first oil passage (401) at a position corresponding to the cylindrical end surface of the second valve core (114); a second through hole (322) is provided on the side wall of the second oil passage (402) at a position corresponding to the cylindrical end surface of the first valve core (104); the first oil passage (401) and the second oil passage (402) are respectively located on both sides of the first valve core (104) and the second valve core (114); the third oil passage (411) passes through the first receiving space (501); and the fourth oil passage (412) passes through the second receiving space (502).

7. An engineering machinery device, characterized in that: include: Engineering machinery body; The travel motor according to any one of claims 1 to 6 is arranged on the engineering machinery body and is used to drive the engineering machinery body to move.

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