Power shift clutch drain valve

Abstract

The present application relates to the technical field of clutch, and particularly provides a power reversing clutch oil leakage valve, which is sealedly arranged in an oil discharging hole of a power reversing clutch, and is closed when the power reversing clutch transmits power. The present application is provided with the oil leakage valve in the oil discharging hole, so that when the power reversing clutch transmits power, the hydraulic oil entering the piston cavity no longer flows into the backflow hole, but acts on the left piston cavity entirely, so that the oil pressure in the left piston cavity rises rapidly, the left piston moves rapidly, the pressure of the left piston on the friction plate is sufficient, the friction plate can be pressed against the steel plate rapidly and with sufficient pressure, and the problem of slippage between the friction plate and the steel plate caused by insufficient pressure is avoided.

Description

Technical Field

[0001] This invention relates to the field of clutch technology, and in particular to a drain valve for a power reversing clutch. Background Technology

[0002] The power reversing clutch is a core component of an automatic transmission. Its structure consists of a clutch shaft, welded parts, and staggered friction plates and steel plates.

[0003] When transmitting power, hydraulic oil enters the piston chamber through the oil passage inside the clutch shaft, pushing the piston to overcome the return spring force and pressing multiple sets of friction plates and steel plates together. After the two are pressed together, they form a rigid connection, thus realizing the transmission of power.

[0004] When power is cut off, the hydraulic oil in the piston chamber flows back through the oil discharge hole on the welded part. Under the elastic force of the return spring, the piston is pushed back to the initial position. At this time, the clamping force between the friction plate and the steel plate disappears, and the power transmission is cut off.

[0005] However, the following problems exist during the above-mentioned use: due to the presence of the oil drain hole, when transmitting power, some of the hydraulic oil entering the piston chamber will flow back through the oil drain hole. This will cause the oil pressure in the piston chamber to rise slowly and the pressure to be insufficient, which in turn will cause the friction plate to slip when it just engages with the steel plate. Summary of the Invention

[0006] Therefore, it is necessary to provide a power reversing clutch drain valve to address the problems existing in current power reversing clutches, in order to solve the problem that the friction plates are prone to slippage when they are just engaged with the steel plates.

[0007] The above objectives are achieved through the following technical solutions: The oil drain valve of the power reversing clutch is sealed inside the oil drain hole of the power reversing clutch. When the power reversing clutch transmits power, the oil drain valve of the power reversing clutch is closed.

[0008] Furthermore, the power reversing clutch oil relief valve includes a valve body and a valve core. The valve body is sealed in the oil relief hole. An axially penetrating valve hole is opened on the valve body. A radially penetrating return hole is opened in the middle of the valve hole. There are two valve cores, which are movably installed at both ends of the valve hole. When the power reversing clutch transmits power to one end, hydraulic oil enters from the corresponding end of the valve hole, pushing the valve core in the corresponding end to move to isolate the corresponding end of the valve hole from the return hole. After the power reversing clutch stops transmitting power, the valve core resets.

[0009] Furthermore, the valve orifice includes a small diameter section, a large diameter section, and a variable diameter section. The small diameter section is in the middle, the variable diameter section is located at both ends of the small diameter section, and the large diameter section is located at the end of the variable diameter section away from the small diameter section. The reflux orifice is located in the smaller diameter section; The valve core is spherical, and the diameter of the valve core is larger than the diameter of the small diameter section but smaller than the diameter of the large diameter section.

[0010] Furthermore, deformable portions are provided at both ends of the valve body; In its initial state, the deformable part is configured to allow the valve core to be installed in the valve bore; After the deformation part deforms, it prevents the valve core from coming out of the valve hole.

[0011] Furthermore, a first limiting ring is detachably installed at both ends of the valve body, and the inner diameter of the first limiting ring is smaller than the diameter of the valve core ball.

[0012] Furthermore, the first limiting ring is installed at both ends of the valve body via a threaded connection.

[0013] Furthermore, the power reversing clutch drain valve includes a valve body, a valve core, and a limit end seat; The valve body is slidably sealed to the unloading hole. The valve body has an axially penetrating valve hole, which includes a small diameter section and two variable diameter sections. The small diameter section is located in the middle of the valve body. The small ends of the two variable diameter sections are connected to the small diameter section. The small diameter section has a radially penetrating return hole through the valve body. There are two limiting end seats, which are detachably connected to both ends of the unloading hole. There are two valve cores, which are spherical and are movably installed at both ends of the valve hole. Two auxiliary oil discharge holes are symmetrically opened on the power reversing clutch with the center plane of the oil discharge hole as the symmetrical surface. The two auxiliary oil discharge holes are respectively connected to the two ends of the oil discharge hole. When the power reversing clutch transmits power outward, hydraulic oil enters from the corresponding end of the valve hole, pushing the valve body to move to the corresponding end of the unloading auxiliary hole to connect with the corresponding end of the valve hole, and pushing the valve core in the corresponding end to move to isolate the corresponding end of the valve hole from the return hole.

[0014] Furthermore, when the valve body abuts against one of the limiting end seats, the distance between the valve body and the other limiting end seat is less than the diameter of the valve core ball.

[0015] Furthermore, an annular flange is provided on the inner end face of the limiting end seat.

[0016] Furthermore, several sealing rings are spaced apart around the valve body.

[0017] The beneficial effects of this invention are: 1. This invention incorporates an oil drain valve within the oil drain hole, ensuring that when the power reversing clutch transmits power, the hydraulic oil entering the piston chamber no longer flows into the return hole. Instead, it is entirely directed to the left piston chamber, causing the oil pressure in the left piston chamber to rise rapidly. This guarantees rapid piston movement on the left side and sufficient pressure from the left piston on the friction plate, enabling the friction plate to quickly and sufficiently press against the steel plate, thus preventing slippage between the friction plate and the steel plate due to insufficient pressure.

[0018] 2. The oil drain valve provided in this invention also has the advantage of being easy to install and disassemble, without requiring modification to the existing oil drain hole of the power reversing clutch. During installation, the oil drain valve is sealed in the oil drain hole by tapping it with a rubber mallet. During disassembly, the oil drain valve is removed from the oil drain hole by holding the pin in place and tapping the pin with a rubber mallet.

[0019] 3. By opening an auxiliary oil discharge hole on the welded part, the present invention increases the path for hydraulic oil in the piston chamber to flow into the valve hole, so that the hydraulic oil in the piston chamber can be quickly discharged into the hydraulic oil tank, thereby accelerating the piston reset speed and avoiding excessive wear of the friction plate due to slow oil discharge speed.

[0020] 4. This invention allows the valve body to slide within the unloading hole. When the power reversing clutch transmits power outward, the hydraulic oil pushes the valve body to move until it abuts against the limiting end seat at the non-hydraulic oil inlet end. At this time, a certain distance is formed between the valve body and the limiting end seat at the hydraulic oil inlet end. When the power reversing clutch stops transmitting power outward, the spherical valve core can move under centrifugal force to be stuck between the limiting end seat at the hydraulic oil inlet end and the valve body. Compared to the valve core being entirely located in the variable diameter section area, by making the valve core stuck between the limiting end seat and the valve body, the obstruction area of ​​the valve core against the hydraulic oil flowing into the limiting end seat port is reduced. This ensures that the valve core has sufficient clearance space to ensure that when the hydraulic system releases oil pressure, the hydraulic oil in the piston chamber can be quickly discharged into the valve hole, thereby accelerating the piston reset speed and preventing excessive wear of the friction plates due to slow unloading speed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a power reversing clutch; Figure 2 for Figure 1 Side view; Figure 3 for Figure 2 Sectional view of AA; Figure 4 for Figure 1 The front view; Figure 5 for Figure 4 BB section view; Figure 6 for Figure 5 A magnified schematic diagram of the structure at point C; Figure 7 This is a schematic diagram of the first embodiment of the oil drain valve for the power reversing clutch of the present invention; Figure 8 for Figure 7 A sectional view; Figure 9 This is a schematic diagram of the second embodiment of the oil drain valve for the power reversing clutch of the present invention; Figure 10 for Figure 9 A sectional view; Figure 11 This is a schematic diagram of the installation of the third embodiment of the power reversing clutch drain valve of the present invention; Figure 12 for Figure 11 A magnified schematic diagram of the structure at point D; Figure 13 This is a schematic diagram of the position of the valve core in the third embodiment when the power reversing clutch is not transmitting power.

[0022] in: 101. Clutch shaft; 1011. Oil inlet passage; 102. Welded assembly; 1021. Oil drain passage; 1022. Oil unloading auxiliary hole; 103. Friction plate; 104. Piston; 105. Oil unloading hole; 106. Steel plate; 107. Return spring; 210. Valve body; 211. Valve hole; 212. Return hole; 220. Valve core; 230. Deformation part; 240. First limiting ring; 250. Limiting end seat; 251. Annular flange; 260. Sealing ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] The following reference Figures 1-13 This invention describes the drain valve for the power reversing clutch.

[0027] The power reversing clutch includes a clutch shaft 101, a welded component 102, friction plates 103, steel plates 106, a return spring 107, and a piston 104. The welded component 102 is located outside the clutch shaft 101. There are multiple friction plates 103 and steel plates 106, each divided into two groups. A group of friction plates 103 and steel plates 106 is arranged at each end of the welded component 102. The multiple friction plates 103 and steel plates 106 at both ends of the welded component 102 are alternately arranged. The return spring 107 is located inside the welded component 102, ensuring that the friction plates 103 and steel plates 106 are initially spaced apart. There are two pistons 104, which are symmetrically arranged about the central plane of the welded part 102 and are coaxially slidably connected in the piston chamber opened on the welded part 102. The clutch shaft 101 has two independent oil inlet channels 1011 for supplying hydraulic oil to the piston chambers of the two pistons 104 respectively. The welded part 102 has an oil discharge hole 105 in the axial direction, which is connected to both piston chambers. The welded part 102 also has an oil drain channel 1021 extending radially along the welded part 102. One end of the oil drain channel 1021 is connected to the oil discharge hole 105, and the other end is connected to the hydraulic oil tank.

[0028] The power reversing clutch drain valve is sealed inside the drain hole 105 of the power reversing clutch. When the power reversing clutch transmits power, the power reversing clutch drain valve is closed.

[0029] In the initial state, the piston 104 is attached to the welded part 102 under the action of the return spring 107, and the piston chamber volume is at its minimum.

[0030] When the power reversing clutch transmits power outward, the hydraulic system allows hydraulic oil to enter the piston chamber through the oil inlet channel 1011 inside the clutch shaft 101, pushing the piston 104 to overcome the elastic force of the return spring 107, pressing multiple sets of friction plates 103 and steel plates 106 together. After the two are pressed together, they form a rigid connection, transmitting the power outward.

[0031] While the power reversing clutch transmits power outward, the power reversing clutch drain valve closes. At this time, the hydraulic oil no longer flows back through the return hole 212. Next, all the hydraulic oil input through the oil inlet channel 1011 acts on the piston chamber, which enables the oil pressure in the piston chamber to rise rapidly. This ensures that the piston 104 moves quickly and that the piston 104 exerts sufficient pressure on the friction plate 103, so that the friction plate 103 can quickly and with sufficient pressure press against the steel plate 106, avoiding slippage between the friction plate 103 and the steel plate 106 due to insufficient pressure.

[0032] When it is necessary to stop the power reversing clutch from transmitting power, the hydraulic system releases oil pressure. At this time, the power reversing clutch drain valve opens, and the hydraulic oil in the piston chamber enters the drain channel 1021 through the power reversing clutch drain valve. Then, it flows back to the hydraulic oil tank through the drain channel 1021. As the hydraulic oil in the piston chamber is gradually discharged, the return spring 107 pushes the piston 104 back to the initial position. At this time, the clamping force between the friction plate 103 and the steel plate 106 disappears, and a gap is generated between them, thus interrupting the power transmission.

[0033] In the first embodiment, as Figures 4-8 As shown, the power reversing clutch drain valve includes a valve body 210 and a valve core 220. The valve body 210 is sealed inside the drain hole 105. The valve body 210 has an axially penetrating valve hole 211. A radially penetrating return hole 212 is provided in the middle of the valve hole 211. There are two valve cores 220, which are movably installed at both ends of the valve hole 211. When the power reversing clutch transmits power to one end, hydraulic oil enters from the corresponding end of the valve hole 211, pushing the valve core 220 in the corresponding end to move to isolate the corresponding end of the valve hole 211 from the return hole 212. After the power reversing clutch stops transmitting power, the valve core 220 resets.

[0034] When the power reversing clutch transmits power outward, hydraulic oil enters the piston chamber through the inlet channel 1011 (taking the hydraulic oil entering the left piston chamber as an example). Since the drain hole 105 is connected to the piston chamber, the hydraulic oil enters from the left end of the valve hole 211, pushing the valve core 220 in the left end of the valve hole 211 to move to isolate the corresponding end of the valve hole 211 from the return hole 212. At this time, the hydraulic oil entering the piston chamber no longer flows into the return hole 212, but acts entirely on the left piston chamber, causing the oil pressure in the left piston chamber to rise rapidly. This ensures that the left piston 104 moves quickly and that the left piston 104 exerts sufficient pressure on the friction plate 103, allowing the friction plate 103 to quickly and with sufficient pressure press against the steel plate 106, avoiding slippage between the friction plate 103 and the steel plate 106 due to insufficient pressure. The same principle applies when the hydraulic system allows hydraulic oil to enter the right piston chamber through another inlet channel 1011; the specific process will not be described in detail.

[0035] When it is necessary to stop the power reversing clutch from transmitting power, the hydraulic system releases oil pressure. At this time, the valve core 220 resets, no longer isolating the corresponding end of the valve port 211 from the return port 212. The hydraulic oil in the piston chamber then enters the valve port 211, passes through the return port 212 in the middle of the valve port 211, and enters the drain channel 1021, and then flows back to the hydraulic oil tank through the drain channel 1021. As the hydraulic oil in the piston chamber is gradually discharged, the return spring 107 gradually pushes the piston 104 back to the initial position. At this time, the clamping force between the friction plate 103 and the steel plate 106 disappears, creating a gap between them, and power transmission is interrupted.

[0036] It should be noted that this drain valve also has the advantage of easy installation and disassembly, without requiring modification to the existing drain port 105 of the power reversing clutch. During installation, the drain valve is sealed in the drain port 105 by tapping it with a rubber mallet. During disassembly, the drain valve is removed from the drain port 105 by holding the pin in place and tapping the pin with a rubber mallet.

[0037] In a further embodiment, such as Figure 8 As shown, the valve orifice 211 includes a small diameter section, a large diameter section, and a variable diameter section. The small diameter section is in the middle, the variable diameter section is located at both ends of the small diameter section, and the large diameter section is located at the end of the variable diameter section away from the small diameter section. The return orifice 212 is located in the small diameter section. The valve core 220 is spherical, and the diameter of the valve core 220 is larger than the diameter of the small diameter section and smaller than the diameter of the large diameter section.

[0038] When the power reversing clutch transmits power outward, the hydraulic system causes hydraulic oil to enter the piston chamber through the oil inlet channel 1011. At this time, the oil pressure in the piston chamber and the valve port 211 increases. When the oil pressure increases to the point that the thrust from the hydraulic oil on the valve core 220 is greater than the centrifugal force on the valve core 220, the spherical valve core 220 moves from the large end to the small end along the variable diameter section until the valve core 220 blocks the small diameter section port. At this time, the corresponding end of the valve port 211 is isolated from the return hole 212. The hydraulic oil no longer flows back through the return hole 212. The hydraulic oil that subsequently enters the piston 104 chamber through the oil inlet channel 1011 acts entirely on the piston 104 chamber, causing the oil pressure in the piston 104 chamber to rise rapidly.

[0039] After the hydraulic system releases oil pressure, the oil pressure in the piston chamber drops. At this time, the centrifugal force on the valve core 220 is greater than the thrust of the hydraulic oil on the valve core 220. Under the action of centrifugal force, the valve core 220 moves from the small end to the large end of the variable diameter section. At this time, the valve core 220 no longer blocks the small diameter section port. The hydraulic oil entering the corresponding end of the valve port 211 enters the return port 212 through the small diameter section, enters the drain channel 1021 through the return port 212, and then flows back to the hydraulic oil tank through the drain channel 1021. When the valve core 220 moves to the area of ​​the large diameter section, the blocking area of ​​the valve core 220 on the small diameter section port is minimal, and the flow area is maximized. The hydraulic oil in the piston chamber can quickly flow back to the hydraulic oil tank.

[0040] Specifically, the valve core 220 is made of carbon steel and has a hard chrome plating treatment on the surface to improve its hardness, wear resistance and corrosion resistance.

[0041] It should also be noted that, compared to directly machining the large-diameter section, variable-diameter section, and small-diameter section within the existing oil discharge hole 105, the method adopted in this invention, which involves setting up the valve body 210 and machining the large-diameter section, variable-diameter section, and small-diameter section inside the valve body 210, is easier to manufacture on a machine tool and easier to replace after wear. When the valve body 210 wears out, it can be replaced directly without replacing the entire welded assembly 102, resulting in lower maintenance costs.

[0042] In a further embodiment, such as Figures 6-8 As shown, both ends of the valve body 210 are provided with deformable portions 230; in the initial state, the deformable portions 230 are configured to allow the valve core 220 to be installed in the valve hole 211; after the deformable portions 230 are deformed, they restrict the valve core 220 from being dislodged from the valve hole 211.

[0043] After the valve body 210 is machined, its shape is as follows: Figure 7 and Figure 8 As shown, at this time, the deformable part 230 protrudes outward, and the port diameter of the deformable part 230 is the largest, which is larger than the ball diameter of the valve core 220, so as to facilitate the installation of the valve core 220 into the valve hole 211.

[0044] After the valve core 220 is installed inside the valve hole 211, the valve body 210 is then sealed and installed inside the oil discharge hole 105. During this process, the valve body 210 is hammered with a rubber mallet, which causes the deformable part 230 to converge inward, reducing the size of the port of the deformable part 230 until the deformable part 230 is flattened by the rubber mallet. At this point, the port of the deformable part 230 is reduced to its minimum size (less than the ball diameter of the valve core 220), and the valve core 220 will not come out of the port of the deformable part 230.

[0045] The second embodiment differs from the first embodiment in that, for example Figure 9 and Figure 10 As shown, a first limiting ring 240 is detachably installed at both ends of the valve body 210, and the inner diameter of the first limiting ring 240 is smaller than the ball diameter of the valve core 220.

[0046] During installation, first install the valve core 220 into the valve hole 211 of the valve body 210, and then install the two first limit rings 240 at both ends of the valve body 210.

[0047] Compared with Example 1, Example 2 has the advantages of being easier to disassemble and having lower replacement costs.

[0048] When the valve core 220 is worn, simply remove the first limiting ring 240, take out the worn valve core 220, replace it with a new valve core 220, and finally reinstall the first limiting ring 240 onto the valve body 210.

[0049] Specifically, such as Figure 10As shown, the first limiting ring 240 is installed at both ends of the valve body 210 by means of a threaded connection.

[0050] The purpose of using a threaded connection for detachable connection is to simplify the structure, facilitate processing and disassembly, and reduce costs. To prevent the first limiting ring 240 from loosening due to vibrations during operation, a layer of sealant is preferably applied to the connection between the first limiting ring 240 and the valve body 210 during installation.

[0051] In the third embodiment, as Figures 11-13 As shown, the power reversing clutch drain valve includes a valve body 210, a valve core 220, and a limiting end seat 250. The valve body 210 is slidably sealed within the drain hole 105. An axially penetrating valve hole 211 is provided on the valve body 210. The valve hole 211 includes a small-diameter section and two variable-diameter sections. The small-diameter section is located in the middle of the valve body 210, and the small ends of the two variable-diameter sections are connected to the small-diameter section. A radially penetrating return hole 212 is provided on the small-diameter section. There are two limiting end seats 250, which are detachably connected to both ends of the drain hole 105. There are two spherical valve cores 220. The valve is installed at both ends of the valve hole 211. On the power reversing clutch (specifically on the welded part 102), two auxiliary drain holes 1022 are symmetrically opened with the center plane of the drain hole 105 as the symmetrical plane. The two auxiliary drain holes 1022 are respectively connected to the two ends of the drain hole 105. When the power reversing clutch transmits power outward, hydraulic oil enters from the corresponding end of the valve hole 211, pushing the valve body 210 to move to the corresponding end of the drain hole 1022 to connect with the corresponding end of the valve hole 211, and pushing the valve core 220 in the corresponding end to move to isolate the corresponding end of the valve hole 211 from the return hole 212.

[0052] When the power reversing clutch transmits power outward, the hydraulic system allows hydraulic oil to enter the piston chamber at the corresponding end (taking the left end as an example) through the oil inlet channel 1011. At the same time, the hydraulic oil passes through the limit end seat 250 and enters the valve port 211. Since the valve body 210 is slidably connected in the oil discharge port 105, the valve body 210 moves to the right under the action of oil pressure until it abuts against the limit end seat 250 at the right end. At the same time, the valve core 220 moves to the right relative to the valve body 210 along the variable diameter section until the valve core 220 abuts against the right port of the small diameter section. At this time, the corresponding end of the valve port 211 is isolated from the return port 212, and the hydraulic oil no longer flows back through the return port 212. The hydraulic oil that subsequently enters the piston chamber through the oil inlet channel 1011 acts entirely on the piston chamber 104, causing the oil pressure in the piston chamber 104 to rise rapidly.

[0053] After the hydraulic system releases the oil pressure, the oil pressure in the piston 104 chamber drops. When the centrifugal force on the valve core 220 is greater than the thrust of the hydraulic oil on the valve core 220, the valve core 220 moves from the small end to the large end of the variable diameter section. At this time, the valve core 220 no longer blocks the small diameter section port. Since the oil discharge auxiliary hole 1022 is connected to the corresponding end of the piston chamber, the hydraulic oil in the piston chamber can enter the valve hole 211 through the limit end seat 250 and the oil discharge auxiliary hole 1022 at the same time. In this way, the hydraulic oil in the piston chamber can be discharged quickly, which speeds up the piston 104 reset speed and avoids excessive wear of the friction plate 103 due to the slow oil discharge speed.

[0054] Preferably, the limiting end seat 250 is detachably connected to both ends of the oil drain hole 105 by a threaded connection. Similarly, to prevent the limiting end seat 250 from loosening due to vibration during operation, a layer of sealant is preferably applied to the connection between the limiting end seat 250 and the oil drain hole 105 during installation.

[0055] In a further embodiment, such as Figure 12 and Figure 13 As shown, an annular flange 251 is provided on the inner end face of the limiting end seat 250.

[0056] The purpose of setting the annular flange 251 is twofold. One purpose is to limit the valve core 220 and prevent it from separating from the variable diameter section. The second purpose is to guide the flow of hydraulic oil so that the flow direction of the hydraulic oil is consistent with the movement direction of the valve body 210, thereby avoiding kinetic energy loss.

[0057] In a further embodiment, such as Figure 13 As shown, when the valve body 210 abuts against one of the limiting end seats 250, the distance between the valve body 210 and the other limiting end seat 250 is less than the ball diameter of the valve core 220.

[0058] by Figure 13 As shown, after the hydraulic system releases oil pressure, the valve body 210 still abuts against the right end seat 250. At this time, the distance between the valve body 210 and the left end seat 250 is less than the ball diameter of the valve core 220. Therefore, under the action of centrifugal force, the valve core 220 slides along the variable diameter section to be stuck between the left end seat 250 and the valve body 210. Compared with the valve core 220 being entirely located in the variable diameter section area, by making the valve core 220 stuck between the end seat 250 and the valve body 210, the blocking area of ​​the valve core 220 against the hydraulic oil flowing into the port of the end seat 250 is reduced, so that the valve core 220 has enough clearance space to ensure that when the hydraulic system releases oil pressure, the hydraulic oil in the piston 104 chamber can be quickly discharged into the valve hole 211, thereby accelerating the piston 104 reset speed and avoiding excessive wear of the friction plate 103 due to the slow oil discharge speed.

[0059] In a further embodiment, such as Figure 12 and Figure 13 As shown, a number of sealing rings 260 are spaced apart on the outer periphery of the valve body 210.

[0060] Several sealing rings 260 are provided to seal the area between the outer periphery of the valve body 210 and the oil discharge hole 105.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A drain valve for a power reversing clutch, sealed and installed inside the drain hole of the power reversing clutch, characterized in that, When the power reversing clutch transmits power, the power reversing clutch drain valve is closed.

2. The power reversing clutch drain valve according to claim 1, characterized in that, It includes a valve body and a valve core. The valve body is sealed in the oil discharge hole. The valve body has an axially penetrating valve hole. A radially penetrating return hole is opened in the middle of the valve hole. There are two valve cores, which are movably installed at both ends of the valve hole. When the power reversing clutch transmits power to one end, hydraulic oil enters from the corresponding end of the valve hole, pushing the valve core in the corresponding end to move to isolate the corresponding end of the valve hole from the return hole. After the power reversing clutch stops transmitting power, the valve core resets.

3. The power reversing clutch drain valve according to claim 2, characterized in that, The valve orifice includes a small diameter section, a large diameter section, and a variable diameter section. The small diameter section is in the middle, the variable diameter section is located at both ends of the small diameter section, and the large diameter section is located at the end of the variable diameter section away from the small diameter section. The reflux orifice is located in the smaller diameter section; The valve core is spherical, and the diameter of the valve core is larger than the diameter of the small diameter section but smaller than the diameter of the large diameter section.

4. The power reversing clutch drain valve according to claim 3, characterized in that, Deformable sections are provided at both ends of the valve body; In its initial state, the deformable part is configured to allow the valve core to be installed in the valve bore; After the deformation part deforms, it prevents the valve core from coming out of the valve hole.

5. The power reversing clutch drain valve according to claim 3, characterized in that, The valve body is detachably equipped with a first limiting ring at both ends, and the inner diameter of the first limiting ring is smaller than the diameter of the valve core ball.

6. The power reversing clutch drain valve according to claim 5, characterized in that, The first limiting ring is installed at both ends of the valve body via a threaded connection.

7. The power reversing clutch drain valve according to claim 1, characterized in that, Includes valve body, valve core, and limit end seat; The valve body is slidably sealed to the unloading hole. The valve body has an axially penetrating valve hole, which includes a small diameter section and two variable diameter sections. The small diameter section is located in the middle of the valve body. The small ends of the two variable diameter sections are connected to the small diameter section. The small diameter section has a radially penetrating return hole through the valve body. There are two limiting end seats, which are detachably connected to both ends of the unloading hole. There are two valve cores, which are spherical and are movably installed at both ends of the valve hole. The power reversing clutch has two auxiliary oil discharge holes symmetrically opened with the center plane of the oil discharge hole as the symmetrical surface, and the two auxiliary oil discharge holes are respectively connected to the two ends of the oil discharge hole. When the power reversing clutch transmits power outward, hydraulic oil enters from the corresponding end of the valve hole, pushing the valve body to move to the corresponding end of the unloading auxiliary hole to connect with the corresponding end of the valve hole, and pushing the valve core in the corresponding end to move to isolate the corresponding end of the valve hole from the return hole.

8. The power reversing clutch drain valve according to claim 7, characterized in that, When the valve body abuts against one of the limiting end seats, the distance between the valve body and the other limiting end seat is less than the diameter of the valve core ball.

9. The power reversing clutch drain valve according to claim 8, characterized in that, An annular flange is provided on the inner end face of the limiting end seat.

10. The power reversing clutch drain valve according to claim 7, characterized in that, Several sealing rings are spaced apart around the valve body.

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