An RV reducer

Abstract

The present invention relates to the technical field of reducers, and specifically provides an RV reducer, including a reducer body and a shell, the reducer body is located inside the shell, and both ends of the shell are rotatably connected to output disc frames, an output end cover is fixedly provided on the output disc frame, a lubricating oil cavity is provided between the output end cover and the output disc frame, a sealing ring is provided between the outer periphery of the output disc frame and the shell, an annular lubricating oil flow channel is formed between the sealing ring and the shell, a plurality of sub-chambers capable of circumferential sliding are provided in the sealing ring, and the sub-chambers are independent of each other, when the reducer body rotates, the lubricating oil can be evenly entered into each sub-chamber, avoiding uneven distribution of the lubricating oil due to gravity, ensuring consistent oil injection amount of each oil injection port, and at the same time, the even distribution of the lubricating oil makes the oil pressure at each position of the sealing ring consistent, solving the problem of uneven sealing caused by oil pressure difference in traditional design, and effectively preventing lubricating oil leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of reducers, and in particular to an RV reducer. Background Art

[0002] The RV reducer consists of a planetary gear reducer front stage and a cycloid pinwheel reducer rear stage. The RV reducer has a compact structure, a large transmission ratio, and a transmission mechanism with a self-locking function under certain conditions. It is one of the most commonly used reducers and has low vibration, low noise, and low energy consumption.

[0003] For example, Chinese patent CN117267320B discloses a self-lubricating robot RV reducer. When the three planetary gears of the RV reducer rotate, the lubricating oil inside the reducer will be driven to flow. By providing a guide groove, the power generated by the rotation of the planetary gears can promote the circulation of the lubricating oil, thereby facilitating the discharge of the lubricating oil containing iron chips.

[0004] However, when the above scheme uses the rotation of the three planetary gears to promote the flow of lubricating oil, it ignores the fact that the lubricating oil in the lubricating oil chamber will be affected by oil pressure (static pressure and dynamic pressure) and air pressure (static pressure and dynamic pressure). In addition, because the reducer is arranged and used with the rotating shaft horizontal, the lubricating oil is mainly distributed in the lower part under the action of gravity, and the gas in the lubricating oil chamber is mainly distributed in the upper part. The effect of uniform flow of the lubricating oil under the action of external force is poor. At the same time, when the lubricating oil flows unevenly, the pressure on each position of the sealing ring in the lubricating oil chamber is different, resulting in the sealing effect of the sealing ring. Summary of the Invention

[0005] Based on this, it is necessary to provide an RV reducer to address the problem of uneven sealing caused by the pressure difference at different positions in the current sealing ring.

[0006] The above purpose is achieved through the following technical solutions:

[0007] An RV reducer, comprising:

[0008] The reducer body and the housing, two output disc racks are rotatably provided at both ends of the housing, the two output disc racks are located at both ends of the reducer body and are transmission-connected to the reducer body, an output end cover is fixedly provided on one end of the two output disc racks away from each other, and a lubricating oil cavity is provided between the output end cover and the output disc rack;

[0009] A sealing ring is located between the housing and the outer periphery of the output disc frame. An annular lubricating oil flow channel is provided between the sealing ring and the housing. An oil spray port is provided at one end of the annular lubricating oil flow channel close to the reducer body. A plurality of circumferentially sliding sub-chambers are provided in the annular lubricating oil flow channel.

[0010] Furthermore, a plurality of sliding blocks are provided for circumferential sliding in the annular lubricating oil flow channel, and the plurality of sliding blocks are evenly distributed circumferentially. A roller is rotatably provided on each sliding block, and the axis of the roller extends radially along the output disc rack. The outer periphery of the roller and the end of the two output disc racks close to each other are in rolling contact with the shell, and the sub-chamber is formed between adjacent sliding blocks and rollers.

[0011] Furthermore, a plurality of one-way inlet pressure valves are arranged between the lubricating oil cavity and the annular lubricating oil flow channel, the one-way inlet pressure valve allows the lubricating oil in the lubricating oil cavity to flow into the lubricating oil cavity, a one-way outlet pressure valve is arranged in the oil spray port, the one-way outlet pressure valve allows the lubricating oil to be sprayed out from the oil spray port, the pressure required to open the one-way outlet pressure valve is greater than the pressure required to open the one-way inlet pressure valve, and a centrifugal impeller is rotated in the lubricating oil cavity.

[0012] Furthermore, the reducer body includes an input shaft, two cycloid wheels and three planetary gears, the input shaft is coaxial and rotatably connected to the output disc frame and the output end cover, the input shaft is coaxial and fixedly connected to the centrifugal impeller, the three planetary gears are evenly distributed circumferentially and rotatably connected to one of the two output disc frames, the three planetary gears are all engaged with the input shaft, and the three planetary gears are all coaxial and fixedly connected with an eccentric shaft, the eccentric shaft is connected to the two cycloid wheels, the two cycloid wheels are eccentrically arranged, and a plurality of needle rollers are rotatably arranged on the inner circumference of the shell, and the protrusions on the outer circumference of the two cycloid wheels can contact the plurality of needle rollers.

[0013] Furthermore, the oil spray port of the annular lubricating oil flow channel faces multiple needle rollers, and a switch assembly is provided on the oil spray port, which can open or block the oil spray port. The switch assembly is configured to open the oil spray port before the protrusions on the outer periphery of the two cycloid wheels contact the needle rollers.

[0014] Furthermore, the switch assembly includes a sliding rod and a hinged rod, the sliding rod is axially slidingly arranged in the oil injection port, an elastic member is sleeved on the outer periphery of the sliding rod, and the elastic member is used to maintain the sliding rod in a state of blocking the oil injection port, the hinged rod is hingedly arranged in the shell, one end of the hinged rod is hinged to the sliding rod, and the other end of the hinged rod is connected to the cycloid wheel.

[0015] Furthermore, a first wedge block is fixedly provided on one end of the hinged rod away from the sliding rod, and a second wedge block is fixedly provided on the end surface of the cycloid wheel close to the oil injection port, and the inclined surface of the second wedge block can slide in contact with the inclined surface of the first wedge block.

[0016] Furthermore, a limiting groove is provided on the inner periphery of the oil injection port near one end of the annular lubricating oil flow channel, and a limiting ring is provided on one end of the sliding rod located inside the oil injection port. The limiting ring is axially slidably arranged in the limiting groove, and a through hole is provided on the limiting ring.

[0017] Furthermore, a lubricating oil return channel is provided on the input shaft, the lubricating oil return channel is connected to the lubricating oil cavity, and a plurality of blades are provided on the periphery of the input shaft.

[0018] Furthermore, a magnetic attraction structure is provided in the lubricating oil cavity.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a plurality of circumferentially sliding sub-chambers in the sealing ring, and the sub-chambers are independent of each other. When the reducer body rotates, the lubricating oil can enter each sub-chamber evenly, avoiding uneven distribution of the lubricating oil due to gravity, ensuring that the oil injection amount of each oil injection port is consistent. At the same time, the uniform distribution of the lubricating oil makes the oil pressure at each position of the sealing ring consistent, solving the problem of uneven sealing caused by oil pressure differences in traditional designs and effectively preventing lubricating oil leakage.

[0021] The present invention arranges a high-speed rotating centrifugal impeller in the lubricating oil chamber, and arranges multiple one-way inlet pressure valves between the annular lubricating oil flow channel and the lubricating oil cavity. The high-speed rotation of the centrifugal impeller generates centrifugal force, which throws the lubricating oil to the side wall of the lubricating oil cavity, and accurately supplies oil through the one-way inlet pressure valve. At the same time, a lubricating oil reflux channel and blades are provided on the input shaft. Under the rotation of the blades, the lubricating oil after lubrication is guided to flow back, forming a closed-loop circulation, reducing lubricating oil loss and improving transmission efficiency.

[0022] The present invention directs the oil spray port toward the needle roller inside the shell, and provides a switch assembly on the oil spray port. The switch assembly is configured to open the oil spray port in advance when the protrusion on the outer periphery of the cycloid wheel is about to contact the needle roller. The oil spray port sprays lubricating oil toward the needle roller. At the same time, the sprayed lubricating oil has a certain speed so that it can impact and clean the surface of the needle roller and update the oil film at this position. When the protrusion on the outer periphery of the cycloid wheel contacts the needle roller subsequently, the lubricating oil can have a good lubricating effect.

[0023] The present invention provides a magnetic attraction structure in the lubricating oil cavity, and the magnetic attraction structure can absorb metal debris in the lubricating oil, thereby maintaining long-term, efficient and stable use of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of an RV reducer provided in one embodiment of the present invention;

[0025] Figure 2 for Figure 1A front view of an RV reducer provided in one embodiment;

[0026] Figure 3 for Figure 2 A cross-sectional view of an RV reducer along line AA provided in one embodiment;

[0027] Figure 4 for Figure 3 A partial enlarged view of part X of the RV reducer provided in one embodiment;

[0028] Figure 5 for Figure 3 A partial enlarged view of the Y portion of the RV reducer provided in one embodiment;

[0029] Figure 6 for Figure 2 A cross-sectional view of an RV reducer along line BB provided in one embodiment;

[0030] Figure 7 for Figure 6 A partial enlarged view of the Z portion of the RV reducer provided in one embodiment;

[0031] Figure 8 A schematic structural diagram of an RV reducer provided in one embodiment of the present invention with the output end cover removed;

[0032] Figure 9 A schematic structural diagram of a partial housing and a cycloid gear of an RV reducer provided in one embodiment of the present invention;

[0033] Figure 10 for Figure 9 A partial enlarged view of the U portion of the RV reducer provided in one embodiment;

[0034] Figure 11 This is an exploded view of part of the output disc frame, sealing ring and housing of the RV reducer provided in one embodiment of the present invention.

[0035] in:

[0036] 100, housing; 101, needle roller; 110, output disc frame; 120, output end cover; 130, lubricating oil cavity; 140, sealing ring; 141, annular slide; 150, annular lubricating oil flow channel; 160, sliding block; 170, roller; 180, one-way inlet pressure valve;

[0037] 200, reducer body; 210, input shaft; 220, lubricating oil return channel; 230, blades; 240, centrifugal impeller; 250, planetary gear; 260, eccentric shaft; 270, cycloid gear;

[0038] 300 , fuel injection port; 310 , limiting groove; 320 , sliding rod; 330 , limiting ring; 340 , elastic member; 350 , hinged rod; 360 , first wedge block; 370 , second wedge block. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0040] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0041] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] Refer to the following Figures 1-11 To describe an RV reducer provided by the present invention.

[0043] An RV reducer includes a reducer body 200 and a housing 100. The reducer body 200 is located inside the housing 100. Two output disc racks 110 are rotatably provided at both ends of the housing 100. The two output disc racks 110 are located at both ends of the reducer body 200 and are transmission-connected to the reducer body 200. The reducer body 200 can drive the two output disc racks 110 to rotate. Various internal transmission structures of the reducer body 200 need to be lubricated when rotating. Therefore, an output end cover 120 is provided on one end of the two output disc racks 110 away from each other. The output end cover 120 is coaxial with the output disc rack 110. A lubricating oil cavity 130 is provided between the output end cover 120 and the output disc rack 110. The lubricating oil cavity 130 is filled with lubricating oil. The lubricating oil will enter the reducer body 200 to lubricate the reducer body 200. A sealing ring 140 is provided between the outer periphery of the housing 100 and the output disc frame 110. The sealing ring 140 and the output disc frame 110 seal the housing 100 to prevent leakage of lubricating oil. An annular lubricating oil flow channel 150 is provided between the sealing ring 140 and the housing 100. The annular lubricating oil flow channel 150 is connected to the lubricating oil cavity 130. An oil injection port 300 is provided on one end of the annular lubricating oil flow channel 150 close to the reducer body 200. The lubricating oil inside the lubricating oil cavity 130 will pass through the annular lubricating oil flow channel 150 and be ejected from the oil injection port 300 to lubricate the reducer body 200.

[0044] In order to make the lubricating oil evenly distributed in the annular lubricating oil flow channel 150, the prior art evenly arranges a plurality of blades 230 in the circumferential direction of the annular lubricating oil flow channel 150. The plurality of blades 230 are fixed on the output disc frame 110. When the reducer body 200 is working, the output disc frame 110 is driven to rotate. The plurality of blades 230 on the output disc frame 110 drive the lubricating oil inside the annular lubricating oil flow channel 150 to roll for uniform distribution. However, since the output disc frame 110 is connected to the output end of the reducer body 200, the rotation speed of the output disc frame 110 is relatively slow, so the blades 230 on the output disc frame 110 have an impact on the lubricating oil. The centrifugal force is small, and when the axis of the shell 100 is in a horizontal state, the gravity to which the lubricating oil is subjected during flow will greatly affect the centrifugal effect, thereby causing the lubricating oil at the upper position inside the annular lubricating oil flow channel 150 to flow downward through the blades 230, resulting in uneven distribution of the lubricating oil. The amount of lubricating oil distributed at the upper position of the annular lubricating oil flow channel 150 is less than the amount of lubricating oil at the lower position, thereby causing the amount of lubricating oil sprayed from the upper oil injection port 300 to be less than the amount of lubricating oil sprayed from the lower oil injection port 300, thereby causing different oil pressures at different positions of the sealing ring 140, affecting the overall sealing effect of the sealing ring 140.

[0045] Based on this, in order to improve the uniformity of the lubricating oil distribution inside the annular lubricating oil and improve the sealing effect of the sealing ring 140, the present invention provides a plurality of sub-chambers sliding along the circumferential direction in the annular lubricating oil flow channel 150, each sub-chamber is independent of each other, and each sub-chamber can be connected to the annular lubricating oil flow channel 150 and the oil injection port 300. When the sub-chamber rotates along the circumference of the annular lubricating oil flow channel 150, the lubricating oil inside the lubricating oil cavity 130 will gradually enter each sub-chamber, so that the amount of lubricating oil inside each sub-chamber is the same. Since each sub-chamber is independent of each other and the capacity of each sub-chamber is much smaller than the capacity of the entire annular lubricating oil flow channel 150, the lubricating oil in each sub-chamber will not fluctuate greatly under the action of gravity, so that the oil injection amount of the oil injection port 300 connected to each sub-chamber is similar, the reducer body 200 is lubricated better, and the oil pressure inside each sub-chamber is similar, thereby improving the sealing effect of the sealing ring 140.

[0046] Through the above-mentioned multiple circumferentially sliding sub-chambers, and the sub-chambers are independent of each other, when the sub-chambers rotate, the lubricating oil in the lubricating oil cavity 130 can evenly enter each sub-chamber, each sub-chamber independently stores lubricating oil, and gravity has little effect on the fluctuation of lubricating oil in a single sub-chamber. This overcomes the problem of uneven lubricating oil amount in the upper and lower positions of the annular lubricating oil flow channel 150 caused by the centrifugal force being less than gravity when the blade 230 drives the lubricating oil in the prior art, and the oil injection port 300 sprays oil evenly, avoiding the problem of inconsistent sealing effect caused by oil pressure difference at different positions of the sealing ring 140, enhancing the sealing between the shell 100 and the output disc frame 110, and effectively preventing lubricating oil leakage.

[0047] Specifically, such as Figure 2 、 Figure 3 、 Figure 7 and Figure 11 Figure 7As shown, in order to realize the structural arrangement of the above-mentioned multiple sub-chambers, multiple sliding blocks 160 are circumferentially slidable in the annular lubricating oil flow channel 150, and an annular groove 141 is provided on the sealing ring 140. Parts of the multiple sliding blocks 160 are slidably arranged in the annular groove 141. The annular groove 141 plays a guiding role. The multiple sliding blocks 160 are circumferentially evenly distributed in the annular lubricating oil flow channel 150, and a roller 170 is rotatably provided on each sliding block 160. The axis of the roller 170 extends along the radial direction of the output disc frame 110, and the outer periphery of the roller 170 is in rolling contact with the side wall of the annular lubricating oil flow channel 150. That is, the outer periphery of the roller 170 and the end of the two output disc racks 110 close to each other are in rolling contact with the housing 100, and the above-mentioned sub-chambers are formed between the adjacent sliding blocks 160 and the rollers 170. When the reducer body 200 drives the output disc rack 110 to rotate, since the position of the housing 100 is fixed and does not rotate, the output disc rack 110 drives multiple rollers 170 to rotate, thereby causing the sliding blocks 160 connected to the rollers 170 to rotate in the annular lubricating oil flow channel 150. The formed sub-chambers will rotate along the circumference of the annular lubricating oil flow channel 150, thereby driving the lubricating oil inside each sub-chamber to flow evenly.

[0048] It should be noted that the structure forming the sub-chambers is not limited to the above-described structure and may also employ other structures. For example, rollers may be directly disposed within the annular lubricating oil flow channel 150 for rolling motion, with the axes of the rollers extending radially along the output disc frame 110, thereby forming sub-chambers between adjacent rollers. Of course, other structures are also possible and are not specifically limited herein.

[0049] In a further embodiment, Figure 7 As shown, in order to allow the lubricating oil in the lubricating oil cavity 130 to enter each sub-chamber, a one-way inlet pressure valve 180 is provided between the lubricating oil cavity 130 and the annular lubricating oil flow channel 150. When the one-way inlet pressure valve 180 is subjected to a certain pressure, the lubricating oil is allowed to enter the annular lubricating oil flow channel 150 from the lubricating oil cavity 130. At the same time, a one-way outlet pressure valve (not shown in the figure) is provided in the oil injection port 300. When the one-way outlet pressure valve is subjected to a certain pressure, the lubricating oil is allowed to be ejected from the oil injection port 300. Since there are multiple lubricating oil flow channels 150 provided in the annular lubricating oil flow channel 150, sub-chambers, so the number of one-way inlet pressure valves 180 is the same as the number of sub-chambers. At the same time, the number of one-way outlet pressure valves is at least more than the number of one-way inlet pressure valves 180. Multiple one-way inlet pressure valves 180 are evenly distributed between the lubricating oil cavity 130 and the annular lubricating oil flow channel 150 along the circumferential direction, and the distance between adjacent one-way inlet pressure valves 180 is the same as the distance between the two ends of a sub-chamber, ensuring that each sub-chamber can only be connected to one one-way inlet pressure valve 180, and the lubricating oil passing through the one-way inlet pressure valve 180 will directly enter the sub-chamber.

[0050] It should be noted that if Figure 3 、 Figure 5 and Figure 8 As shown, the one-way inlet pressure valve 180 can only be opened under a certain pressure of the lubricating oil in the lubricating oil cavity 130. Therefore, a centrifugal impeller 240 is provided in the lubricating oil cavity 130. The centrifugal impeller 240 has a high rotation speed. When the centrifugal impeller 240 rotates at a high speed, the lubricating oil in the lubricating oil cavity 130 can be moved to the inner wall of the lubricating oil cavity 130. Since the rotation speed of the centrifugal impeller 240 is high, the centrifugal force on the lubricating oil is large, and the influence of gravity on the lubricating oil can be ignored compared with the large centrifugal force. The high-speed rotating centrifugal impeller 240 makes the lubricating oil form a uniform centrifugal force field, ensuring that the kinetic energy of the oil is consistent in all directions. The lubricating oil thrown to the inner wall is The movement has kinetic energy, which is converted into positive pressure on the one-way inlet pressure valve 180 when it collides. When the pressure exceeds the opening threshold of the one-way inlet pressure valve 180, the one-way inlet pressure valve 180 automatically opens, and the lubricating oil enters the sub-chamber, and the pressure value required for the one-way outlet pressure valve to open in this embodiment is greater than the pressure required for the one-way inlet pressure valve 180 to open, so the lubricating oil entering the sub-chamber will not be directly sprayed out from the oil injection port 300, and can only be sprayed out when the sub-chamber pressure increases to open the one-way outlet pressure valve, ensuring that the oil pressure inside each sub-chamber is similar, avoiding uneven oil supply due to the influence of gravity, and ultimately ensuring that the lubricating oil enters each sub-chamber evenly.

[0051] In a further embodiment, Figure 3 、 Figure 5 、 Figure 6 and Figure 9As shown, the reducer body 200 of the present invention includes an input shaft 210, two cycloid wheels 270 and three planetary gears 250. The input shaft 210 is coaxially and rotatably connected to the output disc frame 110 and the output end cover 120. One end of the input shaft 210 is located inside the housing 100, and the other end of the input shaft 210 extends out of the output disc frame 110 and the output end cover 120, and the end is used to connect to a driving source (not shown in the figure). The driving source drives the input shaft 210 to rotate, and the three planetary gears 250 are arranged on the output disc frame 110 in a uniform circumferential direction. The three planetary gears 250 are meshed with the input shaft 210. The input shaft 210 simultaneously drives the three planetary gears 250 to rotate around their own axes, and the three planetary gears 250 are coaxially and fixedly connected with an eccentric shaft 260. The eccentric shaft 260 has Two eccentrically arranged bearings have axes parallel to each other. The two cycloid wheels 270 are also eccentrically arranged. Three connecting circular holes are opened on the end faces of the two cycloid wheels 270. The two bearings on the eccentric shaft 260 are connected to the connecting circular holes. When the input shaft 210 rotates and drives the three planetary gears 250, a first-stage deceleration is performed. A plurality of needle rollers 101 are arranged to rotate on the inner circumference of the housing 100. The axes of the plurality of needle rollers 101 are parallel to the axis of the housing 100. The three planetary gears 250 then drive the two cycloid wheels 270 to rotate eccentrically through the three eccentric shafts 260. The protrusions on the outer circumference of the two cycloid wheels 270 contact the needle rollers 101 to perform a second-stage deceleration. Finally, the two cycloid wheels 270 drive the two output disc frames 110 to rotate, and the output disc frames 110 drive the output end cover 120 to output power.

[0052] It should be noted that if Figure 3 、 Figure 5 and Figure 6 As shown, the centrifugal impeller 240 in the present invention is coaxial with the input shaft 210 and fixedly connected. The input shaft 210 rotates at a high speed, thereby driving the centrifugal impeller 240 to rotate at a high speed. In order to allow the lubricating oil to circulate in the housing 100, a lubricating oil return channel 220 is opened on the input shaft 210. The lubricating oil return channel 220 is connected to the lubricating oil cavity 130, so that the lubricating oil is sprayed from the oil injection port 300 on the reducer body 200 for lubrication and then flows back to the lubricating oil cavity 130 through the lubricating oil return channel 220. The lubricating oil then enters the annular lubricating oil flow channel 150 from the lubricating oil cavity 130. In this cycle, the lubricating oil can continuously lubricate the reducer body 200.

[0053] Specifically, such as Figure 5As shown, in order to provide power for the circulation of lubricating oil, a plurality of blades 230 are fixedly connected to the outer periphery of the input shaft 210 near the lubricating oil return channel 220. The plurality of blades 230 are evenly distributed circumferentially on the outer periphery of the input shaft 210, and the plurality of blades 230 are tilted so that when the plurality of blades 230 rotate, the lubricating oil after lubricating the reducer body 200 can be transported into the lubricating oil return channel 220, so that the lubricating oil has power when it refluxes, and the lubricating oil enters the lubricating oil cavity 130 through the lubricating oil return channel 220.

[0054] It should be noted that, since there are two output disc racks 110 and two output end covers 120 in the present invention, the input shaft 210 is provided with lubricating oil return channels 220 distributed left and right, so that the lubricating oil in this embodiment has two circulation paths, such as Figure 5 As shown, the lubricating oil between the output disc frame 110 and the cycloid wheel 270 on the left is transported to the lubricating oil return channel 220 on the left by the left blades 230, and the lubricating oil flows back to the lubricating oil cavity 130 on the left, and then passes through the centrifugal impeller 240 inside the left lubricating oil cavity 130 to enter the annular lubricating oil flow channel 150 on the left; the lubricating oil between the output disc frame 110 and the cycloid wheel 270 on the right is transported to the lubricating oil return channel 220 on the right by the right blades 230, and the lubricating oil flows back to the lubricating oil cavity 130 on the right, and then passes through the centrifugal impeller 240 inside the right lubricating oil cavity 130 to enter the annular lubricating oil flow channel 150 on the right.

[0055] In a further embodiment, Figure 7 As shown, the oil injection port 300 of the present invention is arranged at a position close to the needle roller 101. Since the outer peripheral protrusion of the cycloidal wheel 270 inside the reducer body 200 will continuously contact the needle roller 101 when it is working, the friction loss between the needle roller 101 and the cycloidal wheel 270 is large. Therefore, it is necessary to focus on lubricating the needle roller 101. The oil injection port 300 is arranged at a position close to the needle roller 101, and the oil injection port 300 is directed towards the needle roller 101, so that the lubricating oil sprayed from the oil injection port 300 directly acts on the needle roller 101, and the lubricating oil does not need to be moved to the needle roller 101 under other power drive, so that the needle roller 101 can be lubricated in time. In addition, the lubricating oil has a certain speed when it is sprayed from the oil injection port 300, which can impact the debris generated by wear at the position of the needle roller 101 to achieve the effect of cleaning, and at the same time, it can update the oil film at the position of the needle roller 101, so that when the outer peripheral protrusion of the cycloidal wheel 270 contacts the needle roller 101 later, it can have a better lubrication effect and reduce its wear.

[0056] Specifically, the oil injection port 300 of the present invention is provided with a switch assembly, which can open or close the oil injection port 300. The switch assembly is configured to open the oil injection port 300 before the protrusion on the outer periphery of the cycloid wheel 270 contacts the needle roller 101, so that the oil injection port 300 lubricates the needle roller 101 in advance to prevent the needle roller 101 from suffering friction loss. Figure 9 、 Figure 10 and Figure 11 As shown, the switch assembly in this embodiment includes a sliding rod 320 and a hinged rod 350. The sliding rod 320 is axially slidable within the fuel injection port 300. An elastic member 340 is sleeved around the outer periphery of the sliding rod 320. The elastic member 340 is a compression spring that is used to maintain the sliding rod 320 in a state of blocking the fuel injection port 300. When the sliding rod 320 moves axially and away from the fuel injection port 300, the elastic member 340 is compressed, but the fuel injection port 300 is no longer blocked. The portion between the two ends of the hinged rod 350 is hinged within the housing 100. One end of the hinged rod 350 is hinged to the sliding rod 320. When the other end of the hinged rod 350 is subjected to the eccentric rotation force of the cycloid wheel 270, the hinged rod 350 can swing about the hinged position with the housing 100, thereby causing the other end of the hinged rod 350 to pull the sliding rod 320, which in turn compresses the elastic member 340, thereby opening the fuel injection port 300.

[0057] More specifically, Figure 7 and Figure 10 As shown, in order to make the cycloid wheel 270 better push the hinge rod 350, a first wedge block 360 is fixedly provided on the end of the hinge rod 350 away from the sliding rod 320, and the first wedge block 360 has an inclined surface. A second wedge block 370 is fixedly provided on the end surface of the cycloid wheel 270 close to the hinge rod 350, and the second wedge block 370 also has an inclined surface. The inclined surface of the first wedge block 360 and the inclined surface of the second wedge block 370 are in sliding contact. Due to the eccentric rotation of the cycloid wheel 270, When the protrusion on the outer periphery of the cycloid wheel 270 contacts the needle roller 101, it will move simultaneously in the radial and circumferential directions, causing the second wedge block 370 to move simultaneously. The radial movement of the second wedge block 370 will push the first wedge block 360, causing the first wedge block 360 to drive the hinged rod 350 away from one end of the sliding rod 320 and close to the housing 100. At this time, the hinged rod 350 is connected to one end of the sliding rod 320, pulling the sliding rod 320 to move away from the fuel injection port 300 to open the fuel injection port 300.

[0058] It should be noted that when the cycloid wheel 270 rotates eccentrically inside the housing 100, a part of the protrusions on the outer periphery of the cycloid wheel 270 will contact the needle roller 101, and the other part of the protrusions will separate from the needle roller 101. As the cycloid wheel 270 rotates eccentrically, the part of the protrusions in contact with the needle roller 101 gradually separates from the needle roller 101, and the part of the protrusions that separate from the contact with the needle roller 101 gradually contacts the needle roller 101. When the part of the protrusion contacts the needle roller 101, the second wedge block 370 on the cycloid wheel 270 pushes the first wedge block 360 to move toward the direction close to the annular lubricating oil flow channel 150, so that the hinge rod 350 pulls the sliding rod 320 (the oil injection port 300 at the position of the sliding rod 320 corresponds to the needle roller 101 that is about to contact the protrusion of the cycloid wheel 270) to open the oil injection port 300, thereby lubricating the needle roller 101 that is about to contact the protrusion on the outer periphery of the cycloid wheel 270 in advance.

[0059] Specifically, such as Figure 9 and Figure 10 As shown, in order to enable the sliding rod 320 to open or block the oil injection port 300 when sliding axially, a limiting groove 310 is provided on the inner periphery of the oil injection port 300 near one end of the annular lubricating oil flow channel 150. The limiting groove 310 is an annular groove. The outer periphery of one end of the sliding rod 320 located in the oil injection port 300 is coaxially and fixedly provided with a limiting ring 330. The limiting ring 330 is axially slidably set in the limiting groove 310, and a through hole is provided on the limiting ring 330. One end of the elastic member 340 is connected to the limiting ring 330, and the other end of the elastic member 340 is connected to the limiting groove 310. When the hinged rod 350 is not subjected to action When moved with force, the sliding rod 320 is pushed by the elastic part 340, and the limiting ring 330 on it abuts against the side wall of the limiting groove 310 near the annular lubricating oil flow channel 150. At this time, the through hole on the limiting ring 330 is blocked by the side wall, and the lubricating oil cannot pass through. When the hinge rod 350 pulls the sliding rod 320, the sliding rod 320 compresses the elastic part 340, and the limiting ring 330 on the sliding rod 320 breaks away from the side wall of the limiting groove 310. The through hole is no longer blocked, and the lubricating oil passes through the through hole and flows through the gap between the sliding rod 320 and the oil spray port 300 to be sprayed out, so that the lubricating oil can be sprayed on the needle roller 101.

[0060] In a further embodiment, a magnetic structure (not shown in the figure) may be provided in the lubricating oil cavity 130 , and the magnetic structure is used to absorb metal debris in the lubricating oil to maintain long-term, efficient and stable use of the lubricating fluid.

[0061] For example, a magnet (not shown in the figure) may be fixedly disposed in the lubricating oil cavity 130 , and the magnet is used to absorb metal debris in the lubricating oil.

[0062] The specific working process of an RV reducer provided by the present invention is described in combination with the above embodiments:

[0063] When the RV reducer is working, the power source (not shown in the figure) is connected to the input shaft 210, and the input shaft 210 is engaged with the three planetary gears 250 at the same time. The input shaft 210 drives the planetary gears 250 to rotate to perform a first-stage deceleration. Then, the eccentric shaft 260 on the three planetary gears 250 drives the two cycloid wheels 270 to rotate eccentrically. The cycloid wheels 270 drive the output disc frame 110 to rotate for a second deceleration. The output end cover 120 on the output disc frame 110 outputs the power.

[0064] lubricating:

[0065] When the input shaft 210 rotates, it can drive the blades 230 on the periphery to rotate at high speed. The blades 230 can transport the lubricating oil from the lubricating oil return channel 220 back to the lubricating oil cavity 130. At the same time, the input shaft 210 drives the centrifugal impellers 240 inside the two lubricating oil cavities 130 to rotate synchronously. The high-speed rotation of the centrifugal impellers 240 can throw the lubricating oil inside the lubricating oil cavity 130 to the side wall. When the positive pressure of the one-way inlet pressure valve 180 on the side wall is hit by the lubricating oil and reaches the threshold value for opening the one-way inlet pressure valve 180, When opened, the lubricating oil can enter each sub-chamber through the one-way inlet pressure valve 180, and the rotation of the output disc rack 110 can drive the multiple rollers 170 inside the annular lubricating oil flow channel 150 to roll synchronously. The multiple rollers 170 drive the sliding block 160 to rotate circumferentially along the annular lubricating oil flow channel 150, so that the lubricating oil inside each sub-chamber flows evenly and the internal pressure is similar, so that the sealing ring 140 has better sealing performance and the lubricating oil flows evenly in the annular lubricating oil flow channel 150.

[0066] When the protrusion on the outer periphery of the cycloid wheel 270 is about to contact the needle roller 101, the oil spray port 300 will spray lubricating oil to the needle roller 101 in advance. The second wedge block 370 provided on the cycloid wheel 270 moves synchronously with the cycloid wheel 270 while the cycloid wheel 270 rotates eccentrically. When the protrusion on the outer periphery of the cycloid wheel 270 is about to contact the needle roller 101, it indicates that the protrusion on the rear side of the rotation direction has contacted the needle roller 101. At this time, the second wedge block 370 on the cycloid wheel 270 has pushed the first wedge block 360 toward the direction close to the annular lubricating oil flow channel 150. The movement causes the hinge rod 350 to pull the sliding rod 320 to move axially away from the oil injection port 300. The sliding rod 320 compresses the elastic member 340. The through hole on the sliding rod 320 is connected to the oil injection port 300. The oil injection port 300 is opened, and the lubricating oil inside the sub-chamber is sprayed out through the oil injection port 300. The lubricating oil is sprayed toward the needle roller 101 that is about to contact the protrusion of the cycloid wheel 270, so that the needle roller 101 is lubricated in advance. The sprayed lubricating oil can impact the debris on the surface of the needle roller 101, and can also renew the oil film on the surface of the needle roller 101, thereby improving the lubrication effect.

[0067] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0068] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An RV reducer, characterized in that: include: The reducer body and the housing, two output disc racks are rotatably provided at both ends of the housing, the two output disc racks are located at both ends of the reducer body and are transmission-connected to the reducer body, an output end cover is fixedly provided on one end of the two output disc racks away from each other, a lubricating oil cavity is provided between the output end cover and the output disc rack, and a centrifugal impeller is rotatably provided in the lubricating oil cavity; a sealing ring, the sealing ring being located between the housing and the outer periphery of the output disc frame, an annular lubricating oil flow channel being defined between the sealing ring and the housing, an oil spray port being defined at one end of the annular lubricating oil flow channel close to the reducer body, and a plurality of circumferentially sliding sub-chambers being defined within the annular lubricating oil flow channel; The reducer body includes an input shaft, two cycloid wheels and three planetary gears, the input shaft is coaxial and rotatably connected to the output disc frame and the output end cover, the input shaft is coaxial and fixedly connected to the centrifugal impeller, the three planetary gears are evenly distributed circumferentially and rotatably connected to one of the two output disc frames, the three planetary gears are all meshed with the input shaft, and the three planetary gears are coaxially and fixedly connected to an eccentric shaft, the eccentric shaft is connected to the two cycloid wheels, the two cycloid wheels are eccentrically arranged, a plurality of needle rollers are rotatably arranged on the inner circumference of the housing, and the protrusions on the outer circumference of the two cycloid wheels can contact the plurality of needle rollers; The oil injection port of the annular lubricating oil flow channel faces the plurality of needle rollers, and a switch assembly is provided on the oil injection port. The switch assembly can open or block the oil injection port, and the switch assembly is configured to open the oil injection port before the protrusions on the outer periphery of the two cycloid wheels contact the needle rollers; The switch assembly includes a sliding rod and a hinged rod. The sliding rod is axially slidably arranged in the oil injection port. An elastic member is sleeved on the outer periphery of the sliding rod. The elastic member is used to maintain the sliding rod in a state of blocking the oil injection port. The hinged rod is hingedly arranged in the housing. One end of the hinged rod is hinged to the sliding rod, and the other end of the hinged rod is connected to the cycloid wheel. A first wedge block is fixedly provided on one end of the hinged rod away from the sliding rod, and a second wedge block is fixedly provided on the end surface of the cycloid wheel close to the oil injection port, and the inclined surface of the second wedge block can slide in contact with the inclined surface of the first wedge block.

2. The RV reducer according to claim 1, characterized in that: A plurality of sliding blocks are circumferentially slidably arranged in the annular lubricating oil flow channel, and the plurality of sliding blocks are evenly distributed circumferentially. A roller is rotatably arranged on each sliding block, and the axis of the roller extends along the radial direction of the output disc rack. The outer periphery of the roller and the end of the two output disc racks close to each other are in rolling contact with the shell, and the sub-chamber is formed between adjacent sliding blocks and rollers.

3. The RV reducer according to claim 2, characterized in that: A plurality of one-way inlet pressure valves are arranged between the lubricating oil cavity and the annular lubricating oil flow channel, and the one-way inlet pressure valves allow the lubricating oil in the lubricating oil cavity to flow into the lubricating oil cavity. A one-way outlet pressure valve is arranged in the oil spray port, and the one-way outlet pressure valve allows the lubricating oil to be sprayed out from the oil spray port. The pressure required to open the one-way outlet pressure valve is greater than the pressure required to open the one-way inlet pressure valve.

4. The RV reducer according to claim 1, characterized in that: A limiting groove is provided on the inner circumference of the oil injection port near one end of the annular lubricating oil flow channel, and a limiting ring is provided on one end of the sliding rod located inside the oil injection port. The limiting ring is axially slidably arranged in the limiting groove, and a through hole is provided on the limiting ring.

5. The RV reducer according to claim 1, characterized in that: A lubricating oil return channel is provided on the input shaft, the lubricating oil return channel is connected to the lubricating oil cavity, and a plurality of blades are provided on the periphery of the input shaft.

6. The RV reducer according to claim 1, characterized in that: A magnetic attraction structure is provided in the lubricating oil cavity.

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