A hydraulic power device

Abstract

The present invention relates to the field of hydraulic power technology, and specifically provides a hydraulic power device, including a shell, a gear set is arranged inside the shell, the gear set includes a first gear and a second gear, and a slidable wedge block is arranged on the teeth of the first gear and the second gear. When the two gears are meshed, the wedge block can abut on the tooth roots of adjacent teeth, so that the liquid in the formed closed liquid cavity or cavity can push the wedge block so that the liquid is discharged or sucked into the closed liquid cavity, thereby preventing the "oil trapped" phenomenon from occurring. At the same time, the structure can reduce liquid leakage, and the inner rings and outer shells of the two gears can rotate relatively, and a swing plate is arranged on the inner ring. When the resistance of the liquid increases, the swing plate approaches the side wall of the tooth matching groove to increase the abutment force of the wedge block on the tooth, thereby sharing the local stress on the tooth, so that the tooth is evenly stressed, avoiding tooth damage caused by excessive local stress, and improving the service life of the gear.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic power technology, in particular to a hydraulic power device. Background Art

[0002] Hydraulic power units are widely used in modern industry and machinery, especially in heavy machinery, engineering equipment, manufacturing equipment, etc. Hydraulic power units transmit power through liquid (usually oil). The core of the system is the hydraulic pump, which converts mechanical energy into liquid pressure energy, and then transmits it to the actuator (such as hydraulic cylinder) through the hydraulic oil pipe to complete the mechanical movement.

[0003] When the gear pump is in use, the meshing gears are prone to form a closed liquid cavity. When the closed liquid cavity is formed, the volume changes continuously. When the volume of the closed liquid cavity decreases, the liquid trapped in the liquid cavity is squeezed. Due to the incompressibility of the liquid, the extrusion process generates very high pressure, and even causes the liquid to heat up and the bearing load to increase. When the volume of the closed liquid cavity increases, it will cause a local vacuum and produce cavitation. These phenomena will cause the gear pump to produce strong vibration and noise, causing the "oil trapped" phenomenon, thereby affecting the service life of the gear pump. The existing solution is to increase the unloading groove and use the unloading groove to avoid the "oil trapped" phenomenon.

[0004] However, the use of unloading grooves is prone to leakage, affecting the transmission function, and the location of the pressure relief groove will lead to untimely pressure unloading in the middle of the gear teeth, which will cause uneven overall force on the gears and reduce the service life of the gear pump. Summary of the invention

[0005] Based on this, it is necessary to provide a hydraulic power device to address the problem that the current unloading groove is prone to leakage, affecting the transmission function, and the location of the pressure relief groove will lead to untimely pressure unloading in the middle of the gear teeth, thereby causing uneven force on the entire gear.

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

[0007] A hydraulic power device, comprising:

[0008] A housing, wherein a gear set is disposed in the housing, wherein a cavity for accommodating the gear set is provided in the housing, wherein a liquid inlet and a liquid outlet are provided on the housing, wherein the liquid inlet and the liquid outlet are connected to the cavity and are located at two ends of the cavity;

[0009] The gear set comprises a first gear and a second gear, the first gear and the second gear mesh with each other, two tooth surfaces of the teeth of the two gears are symmetrically provided with expansion grooves near the tooth tops, the included angle between the two expansion grooves is an obtuse angle, a wedge block is slidably arranged in the expansion groove, the wedge block has a triangular tip, when the two teeth mesh with each other, there is a gap between the tooth surfaces close to each other, and the triangular tips of the wedge blocks on the tooth surfaces far away from each other respectively abut against the tooth roots of the adjacent teeth to form a closed liquid cavity;

[0010] When the volume of the closed liquid chamber increases, the wedge blocks close to the tooth surfaces extend outward, the liquid pressure in the closed liquid chamber decreases, and the liquid in the cavity pushes the wedge blocks away from the tooth surfaces to shrink inward, and the closed liquid chamber absorbs liquid. When the volume of the closed liquid chamber decreases, the wedge blocks close to the tooth surfaces shrink inward, and the liquid pressure in the closed liquid chamber increases to push the wedge blocks away from the tooth surfaces to shrink inward, and the closed liquid chamber discharges liquid.

[0011] Furthermore, the first gear and the second gear each include an inner ring and an outer shell, the outer shell is in the shape of a gear, the inner ring is nested in the outer shell, a plurality of swing plates are fixedly provided on the outer circumferential surface of the inner ring, the plurality of swing plates are radially distributed along the inner ring, the plurality of swing plates are respectively located inside the teeth of the outer shell, the swing plates are elastically connected to the wedge blocks, and when the inner ring and the outer shell rotate relative to each other, the plurality of swing plates abut against the inner side walls of the teeth to increase the force of the wedge blocks abutting against the roots of the teeth.

[0012] Furthermore, a first elastic member is provided in the telescopic groove, one end of the first elastic member is connected to the wedge block, and the other end of the first elastic member is connected to the swing plate. The first elastic member can maintain the wedge block in an initial position or make the wedge block have a tendency to restore the initial position.

[0013] Furthermore, a sliding groove is provided on one end of the swing plate away from the inner ring, a connecting block is slidably arranged in the sliding groove, and the connecting block is connected to the first elastic member.

[0014] Furthermore, the outer shell includes a gear cover and a gear housing, and the gear cover and the gear housing are detachably connected. After the inner ring is nested in the gear housing, the gear cover is connected to the gear housing to restrict the inner ring from being separated from the gear housing.

[0015] Furthermore, the inner ring of the first gear is connected to a driving shaft, and the inner ring of the second gear is connected to a damping shaft. The driving shaft drives the first gear to rotate to drive the second gear to rotate, and the damping shaft provides resistance so that the second gear is driven by the first gear. The resistance provided by the damping shaft is positively correlated with the viscosity of the liquid.

[0016] Furthermore, a second elastic member is disposed on both sides of the plurality of swing plates, and the second elastic member can maintain the initial position of the swing plate inside the tooth or make the swing plate have a tendency to restore the initial position.

[0017] Furthermore, an electromagnetic restriction ring is provided on the outer periphery of the damping shaft, and the electromagnetic restriction ring provides resistance to the damping shaft when power is supplied.

[0018] Furthermore, a shaft seal is provided in the housing, a first sealing hole and a second sealing hole are provided in the shaft seal, the drive shaft is located in the first sealing hole, and the electromagnetic restriction ring sleeve is fixed in the second sealing hole.

[0019] Furthermore, a limiting block is provided in the telescopic slot, and the limiting block limits the distance that the wedge block extends out of the telescopic slot.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a slidable wedge block on the teeth of two gears. When the two gears are meshed, the wedge block can abut against the tooth roots of adjacent teeth, so that the liquid in the formed closed liquid cavity or cavity can push the wedge block to discharge or absorb the liquid into the closed liquid cavity, thereby preventing the "oil trapping" phenomenon. At the same time, this structure can reduce liquid leakage.

[0022] The present invention provides an inner ring and an outer ring that can rotate relative to each other, and a swing plate is provided on the inner ring, and second elastic members are provided on both sides of the swing plate. When the resistance of the liquid increases, the inner ring and the outer ring rotate relative to each other so that the swing plate approaches the side wall of the tooth matching groove to increase the contact force of the wedge block on the tooth, thereby sharing the local stress on the tooth, so that the tooth is evenly stressed, avoiding tooth damage caused by excessive local stress, and improving the service life of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a hydraulic power device provided by an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A top view of a hydraulic power device provided in one embodiment;

[0025] Figure 3 for Figure 2 A cross-sectional view of a hydraulic power device along AA provided in an embodiment;

[0026] Figure 4 for Figure 3 A partial enlarged view of the X portion of the hydraulic power device provided in one embodiment;

[0027] Figure 5 An exploded view of a hydraulic power device provided by an embodiment of the present invention;

[0028] Figure 6 A top view of a first gear and a drive shaft of a hydraulic power device provided in one embodiment of the present invention;

[0029] Figure 7 for Figure 6 A cross-sectional view of a hydraulic power device provided by an embodiment of the present invention along line BB;

[0030] Figure 8 for Figure 7 A partial enlarged view of the Y portion of the hydraulic power device provided in the first embodiment;

[0031] Fig. 9 for Figure 7 A partial enlarged view of the Z portion of the hydraulic power device provided in one embodiment;

[0032] Fig.10 An exploded view of a first gear or a second gear of a hydraulic power device provided by an embodiment of the present invention;

[0033] Fig.11 for Fig.10 A partially enlarged view of the W portion of the hydraulic power device provided in one embodiment.

[0034] in:

[0035] 100, housing; 101, end cover; 110, liquid inlet; 120, liquid outlet; 130, cavity; 131, liquid extraction cavity; 132, liquid discharge cavity; 140, closed liquid cavity; 150, wedge block; 151, triangular tip; 152, limiting block; 160, first elastic member;

[0036] 200, gear set; 210, first gear; 220, second gear; 230, inner ring; 231, swing plate; 232, second elastic member; 233, sliding groove; 234, connecting block; 240, housing; 241, gear cover; 242, gear housing; 250, telescopic groove; 251, limiting plate; 260, matching groove;

[0037] 300, shaft seal; 301, first sealing hole; 302, second sealing hole; 310, drive shaft; 311, first keyway; 312, second keyway; 320, damping shaft; 321, electromagnetic confinement ring. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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 used to limit the present invention.

[0039] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] Refer to the following Figure 1-Figure 11 To describe a hydraulic power device provided by the present invention.

[0042] A hydraulic power device includes a shell 100, the shell 100 is provided with an end cover 101, the end cover 101 is detachably arranged, the shell 100 is provided with a liquid inlet 110 and a liquid outlet 120, the shell 100 has a cavity 130 therein, the liquid inlet 110 and the liquid outlet 120 are both connected to the cavity 130 and are located at two ends of the cavity 130. A gear set 200 is arranged in the cavity 130, and the gear set 200 includes a first gear 210 and a second gear 220. The first gear 210 and the second gear 220 are meshed with each other and divide the cavity 130 into a pumping chamber 131 and a discharge chamber 132. When the first gear 210 and the second gear 220 rotate, the volume of the pumping chamber 131 increases, and a negative pressure is generated in the pumping chamber 131, thereby sucking external liquid into the pumping chamber 131, while the volume of the discharge chamber 132 decreases, and the liquid in the discharge chamber 132 is squeezed out by pressure to complete the discharge. The first gear 210 and the second gear 220 rotate continuously to complete the liquid transportation.

[0043] The first gear 210 and the second gear 220 are provided with expansion grooves 250 on the two tooth surfaces close to the tooth tops. The two expansion grooves 250 are symmetrically arranged. The angle between the two expansion grooves 250 is an obtuse angle. A wedge block 150 is slidably arranged in the expansion groove 250. The wedge block 150 can slide along the extension direction of the expansion groove 250. The wedge block 150 has a triangular tip 151, and the triangular tip 151 is close to the tooth surface. When the two teeth of the first gear 210 and the second gear 220 are meshed, there is a gap between the two tooth surfaces close to each other, and the two tooth surfaces far from each other are spaced apart. The tooth tops of the two tooth surfaces are respectively abutted against the tooth roots of the two adjacent teeth. Since the expansion groove 250 is set at the tooth tops of the two tooth surfaces of the tooth, the wedge block 150 in the expansion groove 250 abuts against the tooth roots of the two adjacent teeth, thereby forming a closed liquid chamber 140. With the rotation of the first gear 210 and the second gear 220, the volume of the closed liquid chamber 140 will change. The volume is the largest at the beginning, and the volume gradually decreases with the rotation, and finally gradually increases to the maximum. The liquid in the closed liquid chamber 140 will be discharged or inhaled due to the change in pressure.

[0044] When the volume of the closed liquid chamber 140 gradually decreases, the pressure in the closed liquid chamber 140 increases, and part of the pressure acts on the wedge block 150 on the tooth surface close to each other, thereby pushing the wedge block 150 to retract, and part of the liquid enters the expansion groove 250 to adapt to the reduction in the volume of the closed liquid chamber 140, and the other part of the pressure acts on the wedge block 150 on the tooth surface away from each other. Since the triangular tip 151 of the wedge block 150 abuts the tooth root, the area around the tip is an inclined surface, and the liquid acts on the inclined surface to push the wedge block 150 to retract so that the cavity 130 is connected with the closed liquid chamber 140, and the liquid in the closed liquid chamber 140 is discharged into the cavity 130, thereby avoiding excessive pressure in the closed liquid chamber 140 and increasing the load on the first gear 210 and the second gear 220. Compared with the traditional setting of the unloading groove, firstly, it can reduce the phenomenon of liquid leakage, and secondly, it can make the force in the closed liquid chamber 140 uniform and avoid excessive pressure;

[0045] When the volume of the closed liquid chamber 140 is reduced to the minimum, it begins to gradually increase. At this time, the closed liquid chamber 140 begins to gradually become negative pressure, and the wedge blocks 150 on the tooth surfaces that are close to each other are gradually reset under the action of the negative pressure of the closed liquid chamber 140. Since the closed liquid chamber 140 discharges part of the liquid when the volume is reduced, the closed liquid chamber 140 is in a negative pressure state when the volume increases, thereby pulling the wedge blocks 150 retracted in the expansion groove 250 outward to suck the liquid accumulated in the expansion groove 250 into the closed liquid chamber 140 to adapt to the increase in the volume of the closed liquid chamber 140. At the same time, due to the reduction in pressure in the closed liquid chamber 140, the liquid in the cavity 130 can push the wedge blocks 150 on the tooth surfaces that are away from each other to retract, and the liquid in the cavity 130 enters the closed liquid chamber 140 to balance the pressure in the closed liquid chamber 140, thereby avoiding cavitation caused by local vacuum in the closed liquid chamber 140.

[0046] Specifically, the first gear 210 and the second gear 220 in this embodiment both include an inner ring 230 and an outer shell 240. The outer shell 240 is gear-shaped. The inner ring 230 is nested in the outer shell 240. A plurality of swing plates 231 are provided on the outer circumferential surface of the inner ring 230. The plurality of swing plates 231 are distributed along the radial direction of the inner ring 230. The swing plates 231 are respectively located inside the teeth of the outer shell 240. The teeth of the outer shell 240 are hollow inside. The swing plates 231 are elastically connected to the wedge block 150. When the inner ring 230 rotates relative to the outer shell 240, the swing plates 231 can move inside the teeth to fit on the inner side wall of the teeth. The swing plates 231 push the wedge block 150, thereby increasing the force of the wedge block 150 against the root of the teeth, making the force on the teeth more uniform, reducing the probability of tooth damage, and thus improving the service life of the first gear 210 and the second gear 220.

[0047] It should be noted that a first elastic member 160 is provided in the telescopic groove 250, one end of the first elastic member 160 is connected to the end of the swing plate 231 away from the inner ring 230, and the other end of the elastic member is connected to the wedge block 150. When the swing plate 231 is attached to the side wall inside the tooth of the outer shell 240, the swing plate 231 pushes the first elastic member 160 on the wedge block 150 on the tooth surface away from each other, the first elastic member 160 is compressed, and the first elastic member 160 pushes the wedge block 150, so that the force of the first elastic member 160 on the wedge block 150 increases, which also increases the force of the wedge block 150 abutting against the tooth root, thereby avoiding large local stress at the tooth root, that is, the wedge block 150 can help the tooth root share some stress, so that the force on the tooth is uniform and stress concentration is avoided.

[0048] In this embodiment, the first elastic member 160 is an elastic sheet, and the elastic sheet is made of a rigid material.

[0049] In order to facilitate the installation of the inner ring 230, the outer ring 240, the wedge block 150 and the elastic member, a sliding groove 233 is provided on the end of the swing plate 231 away from the inner ring 230, and a connecting block 234 is slidably provided in the sliding groove 233. The connecting block 234 is used to connect the first elastic member 160. After the wedge block 150 is connected to the first elastic member 160, the other end of the first elastic member 160 is plugged into the connecting block 234, and then the connecting block 234 is slidably inserted into the sliding groove 233 to limit the separation of the first elastic member 160. The housing 240 includes a gear cover 241 and a gear housing 242. The gear cover 241 and the gear housing 242 in this embodiment are detachably connected. The first elastic member 160 and the wedge block 150 on the swing plate 231 of the inner ring 230 are installed and placed in the gear housing 242, so that each swing plate 231 corresponds to the teeth in the gear housing 242 one by one. After the positions correspond, the gear cover 241 is connected to the gear housing 242 to form a complete gear. This is the case for both the first gear 210 and the second gear 220, which is convenient for disassembly and installation.

[0050] In a further embodiment, the first gear 210 is a driving wheel and the second gear 220 is a driven wheel. The rotation of the first gear 210 drives the second gear 220 to rotate. The inner ring 230 of the first gear 210 is connected to a driving shaft 310, and a first keyway 311 is provided on the driving shaft 310. The inner ring 230 of the first gear 210 is provided with a second keyway 312. A spline is installed between the driving shaft 310 and the inner ring 230 of the first gear 210. The spline is located in the first keyway 311 and the second keyway 312 so that when the driving shaft 310 rotates, it drives the first gear 210 to rotate. Similarly, a damping shaft 320 is connected to the inner ring 230 of the second gear 220. The connection method of the damping shaft 320 is the same as that of the driving shaft 310. The damping shaft 320 is used to provide a certain resistance to the second gear 220, so that the first gear 210 and the second gear 220 are better engaged.

[0051] When the viscosity of the liquid is relatively high, the resistance of the liquid encountered by the first gear 210 and the second gear 220 when they rotate is relatively high, and the resistance of the damping shaft 320 to the second gear 220 is increased, so that when the first gear 210 drives the second gear 220 to rotate, the second gear 220 and the first gear 210 are better engaged; and when the viscosity of the liquid is relatively low, the resistance of the liquid encountered by the first gear 210 and the second gear 220 when they rotate is relatively low, and the resistance of the damping shaft 320 to the second gear 220 is reduced.

[0052] Specifically, the second elastic member 232 is provided on both sides of the swing plate 231 in the present embodiment. The second elastic member 232 makes the swing plate 231 located in the middle position inside the tooth. For the convenience of description, the position inside the tooth is named as the matching groove 260. The matching groove 260 has two parts, one of which has a smaller width, and the matching groove 260 has a larger width close to the axis of the tooth. The width of the swing plate 231 in this part is also larger. The second elastic member 232 is specifically located on the part with a larger width of the swing plate 231. The second elastic members 232 on both sides of the swing plate 231 abut against the side walls of the matching groove 260. Specifically, the second elastic member 232 is located in the part with a larger width of the matching groove 260, and one end of the second elastic member 232 abuts against the side wall of the part with a larger width of the matching groove 260, while the other end is fixedly set on the part with a larger width of the swing plate 231. The specific position of the second elastic member 232 is as shown in FIG. Fig.11The second elastic member 232 makes the swing plate 231 in the middle position in the matching groove 260, that is, the swing plate 231 does not contact the side wall of the matching groove 260. When the viscosity of the liquid in the cavity 130 increases and the force of the liquid on the first gear 210 and the second gear 220 increases, the meshing position of the first gear 210 and the second gear 220 will be subjected to a larger force. At this time, the inner ring 230 and the outer shell 240 of the first gear 210 and the second gear 220 rotate relative to each other, so that the swing plate 231 squeezes the second elastic member 232, so that the swing plate 231 is not located in the middle position of the matching groove 260, but moves toward the direction close to the tooth contact surface.

[0053] by Figure 3 and Figure 4 As shown, the clockwise rotation of the first gear 210 drives the counterclockwise rotation of the second gear 220. On the tooth contact surface where the first gear 210 and the second gear 220 are meshed with each other, the swing plate 231 on the first gear 210 approaches the tooth contact surface in the clockwise direction, and the swing plate 231 on the second gear 220 approaches the tooth contact surface in the clockwise direction, so that the swing plate 231 pushes the first elastic member 160, so that the first elastic member 160 increases the force acting on the wedge block 150, the force of the wedge block 150 abutting against the tooth root increases, and the wedge block 150 shares the force acting on the tooth, thereby avoiding excessive local stress on the tooth surface.

[0054] The second elastic member 232 in this embodiment is also an elastic sheet, and the elastic sheet is made of a rigid material.

[0055] It should be noted that when the force at the meshing position of the first gear 210 and the second gear 220 increases due to the increase in the viscosity of the liquid in the cavity 130, the difficulty of the closed liquid cavity 140 to absorb and discharge the liquid increases, but the length of the wedge blocks 150 on the tooth surfaces close to each other that are extended or shortened in the expansion groove 250 will increase, thereby adapting to the volume change of the closed liquid cavity 140. For example, when the volume of the closed liquid cavity 140 decreases, since the force of the wedge blocks 150 on the tooth surfaces far away from each other against the tooth roots increases to share the local stress of the teeth, less liquid passes through the wedge blocks 150 on the tooth surfaces far away from each other, and the wedge blocks 150 on the tooth surfaces close to each other at this time shorten the distance in the expansion groove 250 much longer, thereby compensating for the volume change of the closed liquid cavity 140 and avoiding excessive pressure in the closed liquid cavity 140 to damage the teeth.

[0056] By means of two symmetrically arranged wedge blocks 150 and a swing plate 231 that can move in the matching groove 260, when the tooth is subjected to a large force, one of the wedge blocks 150 can increase the abutment force against the tooth to share the local stress of the tooth, while the other wedge block 150 can adapt to the closed liquid cavity 140 with a changing volume, thereby avoiding damage to the tooth due to excessive or insufficient pressure in the closed liquid cavity 140, thus killing two birds with one stone.

[0057] In a further embodiment, an electromagnetic confinement ring sleeve 321 is sleeved on the damping shaft 320 of the present invention, and the damping given to the second gear 220 by the damping shaft 320 comes from the electromagnetic confinement ring sleeve 321. When the electromagnetic confinement ring sleeve 321 is energized, a magnetic field is generated, and the damping shaft 320 is a conductor. Under the action of the magnetic field, a force opposite to the rotation direction of the damping shaft 320 is generated, so that the damping shaft 320 has resistance, that is, the damping shaft 320 is connected to the inner ring 230 of the second gear 220, thereby generating damping for the second gear 220, and the damping strength is related to the viscosity of the liquid. The greater the viscosity of the liquid, the greater the damping effect generated by the electromagnetic confinement ring sleeve 321.

[0058] Specifically, a shaft seal 300 is provided inside the shell 100. The shaft seal 300 is used to limit the drive shaft 310 and the damping shaft 320. A first sealing hole 301 and a second sealing hole 302 are opened on the shaft seal 300. The drive shaft 310 is rotatably connected in the first sealing hole 301, and the electromagnetic limiting ring sleeve 321 on the damping shaft 320 is fixedly set in the second sealing hole 302. There are two shaft seals 300 in this embodiment. The two shaft seals 300 respectively limit the two ends of the drive shaft 310 and the damping shaft 320. The two shaft seals 300 are installed in the shell 100 to limit the drive shaft 310 and the damping shaft 320.

[0059] More specifically, a limiting block 152 is provided in the telescopic groove 250 of the tooth, and the limiting block 152 is used to limit the extension distance of the wedge block 150 in the telescopic groove 250. A limiting plate 251 is provided on one end of the wedge block 150 close to the first elastic member 160, and the limiting plate 251 cooperates with the limiting block 152 to prevent the wedge block 150 from escaping from the telescopic groove 250, that is, to limit the extension distance of the wedge block 150 in the telescopic groove 250.

[0060] The specific working process of a hydraulic power device provided by the present invention is described in combination with the above embodiments:

[0061] start up:

[0062] An external driving motor (not shown in the figure) is connected to the driving shaft 310. When the power is turned on, the electromagnetic confinement ring 321 is started to give resistance to the damping shaft 320. The driving shaft 310 rotates to drive the first gear 210 to rotate. The first gear 210 is meshed with the second gear 220 to drive the second gear 220 to rotate. Since the damping shaft 320 gives resistance to the second gear 220, the first gear 210 and the second gear 220 rotate at a constant speed.

[0063] When the liquid viscosity is low:

[0064] When the first gear 210 and the second gear 220 are meshed and rotated with each other, the liquid resistance is small, the inner ring 230 of the first gear 210 and the outer shell 240 do not rotate relative to each other, and a closed liquid cavity 140 is formed between the meshing teeth of the first gear 210 and the second gear 220. Figure 3 and Figure 4 As shown, the wedge blocks 150 on the tooth surfaces of the two meshing teeth that are far away from each other are respectively in contact with the tooth roots on the adjacent teeth, and there is a gap between the tooth surfaces of the two meshing teeth that are close to each other. The expansion grooves 250 and the wedge blocks 150 on the tooth surfaces that are close to each other are located in the closed liquid chamber 140. The volume of the closed liquid chamber 140 is the largest when it is just formed. As the first gear 210 and the second gear 220 rotate, the volume of the closed liquid chamber 140 gradually decreases to the minimum. During the reduction process, a part of the liquid in the closed liquid chamber 140 pushes the wedge blocks 150 on the tooth surfaces that are close to each other to shrink inward to enter the expansion grooves 250, and another part of the liquid pushes the wedge blocks 150 on the tooth surfaces that are far away from each other to shrink inward to open the closed liquid chamber 140, so that part of the liquid is discharged from the closed liquid chamber 140, avoiding the situation where the liquid pressure in the closed liquid chamber 140 is too high and damages the teeth;

[0065] After the closed liquid chamber 140 is reduced to the minimum, it begins to increase gradually and gradually returns to the state of maximum volume. During the process of increasing the volume of the closed liquid chamber 140, negative pressure is generated in the closed liquid chamber 140 and under the action of the first elastic member 160, the wedge blocks 150 on the tooth surfaces close to each other extend in and out of the expansion groove 250, and the liquid in the expansion groove 250 enters the closed liquid chamber 140 again. At the same time, the liquid in the cavity 130 also pushes the wedge blocks 150 on the tooth surfaces away from each other to retract and open the closed liquid chamber 140. The liquid in the cavity 130 is sucked into the closed liquid chamber 140, avoiding the damage to the teeth caused by local vacuum in the closed liquid chamber 140.

[0066] When the liquid viscosity is high:

[0067] When the first gear 210 and the second gear 220 rotate, the resistance of the liquid is relatively large. When the resistance is greater than the force of the second elastic member 232, the driving shaft 310 drives the inner ring 230 to rotate, and the swing plate 231 on the inner ring 230 overcomes the force of the second elastic member 232, which will cause relative rotation between the inner ring 230 and the outer shell 240, so that the swing plate 231 on the inner ring 230 moves toward the side wall of the matching groove 260 close to the teeth. When the resistance of the liquid is large, the force on the teeth of the first gear 210 and the second gear 220 that are meshed with each other will also increase, and the swing plate 231 moves toward the side wall of the matching groove 260 close to the teeth. The increased force on the teeth can be shared by increasing the abutment force of the wedge block 150 on the meshing teeth, so that the local stress of the teeth is shared by the wedge block 150, and the teeth are evenly stressed, thereby avoiding the situation where the teeth are damaged due to excessive local stress.

[0068] At the same time, while increasing the contact force of the wedge block 150 on the tooth, the change in the volume of the closed liquid chamber 140 is not affected, and when the volume of the closed liquid chamber 140 changes, the degree of expansion and contraction of the wedge blocks 150 on the tooth surfaces close to each other in the expansion groove 250 increases to adapt to the volume change of the closed liquid chamber 140. When the volume of the closed liquid chamber 140 decreases, most of the liquid pushes the wedge blocks 150 on the tooth surfaces close to each other to shrink, and most of the liquid enters the expansion groove 250. The degree of shrinkage of the wedge blocks 150 is greater than the degree of shrinkage when the liquid viscosity is smaller, and a small part of the liquid can overcome the wedge blocks 150 on the tooth surfaces far away from each other to discharge from the closed liquid chamber 140, thereby avoiding the situation where the liquid pressure in the closed liquid chamber 140 is too high and damages the tooth;

[0069] When the volume of the closed liquid chamber 140 increases, the wedge blocks 150 on the tooth surfaces close to each other are reset under the action of negative pressure and the first elastic member 160, and the liquid entering the expansion groove 250 re-enters the closed liquid chamber 140. A small amount of liquid also enters the closed liquid chamber 140 through the wedge blocks 150 on the tooth surfaces away from each other, thereby avoiding the situation in which local vacuum in the closed liquid chamber 140 causes damage to the teeth.

[0070] The technical features of the above embodiments may 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.

[0071] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A hydraulic power device, characterized in that: include: A housing, wherein a gear set is disposed in the housing, wherein a cavity for accommodating the gear set is provided in the housing, wherein a liquid inlet and a liquid outlet are provided on the housing, wherein the liquid inlet and the liquid outlet are connected to the cavity and are located at two ends of the cavity; The gear set comprises a first gear and a second gear, the first gear and the second gear mesh with each other, two tooth surfaces of the teeth of the two gears are symmetrically provided with expansion grooves near the tooth tops, the included angle between the two expansion grooves is an obtuse angle, a wedge block is slidably arranged in the expansion groove, the wedge block has a triangular tip, when the two teeth mesh with each other, there is a gap between the tooth surfaces close to each other, and the triangular tips of the wedge blocks on the tooth surfaces far away from each other respectively abut against the tooth roots of the adjacent teeth to form a closed liquid cavity; When the volume of the closed liquid chamber increases, the wedge-shaped blocks close to the tooth surface extend outward, the liquid pressure in the closed liquid chamber decreases, and the liquid in the cavity pushes the wedge-shaped blocks away from the tooth surface to shrink inward, and the closed liquid chamber absorbs liquid. When the volume of the closed liquid chamber decreases, the wedge-shaped blocks close to the tooth surface shrink inward, the liquid pressure in the closed liquid chamber increases to push the wedge-shaped blocks away from the tooth surface to shrink inward, and the closed liquid chamber discharges liquid. The first gear and the second gear each include an inner ring and an outer shell, the outer shell is in the shape of a gear, the inner ring is nested in the outer shell, a plurality of swing plates are fixedly arranged on the outer circumferential surface of the inner ring, the plurality of swing plates are radially distributed along the inner ring, the plurality of swing plates are respectively located inside the teeth of the outer shell, the swing plates are elastically connected to the wedge blocks, and when the inner ring and the outer shell rotate relative to each other, the plurality of swing plates abut against the inner side walls of the teeth to increase the force of the wedge blocks abutting against the roots of the teeth; A first elastic member is disposed in the telescopic groove, one end of the first elastic member is connected to the wedge block, and the other end of the first elastic member is connected to the swing plate, and the first elastic member can maintain the wedge block in an initial position or make the wedge block have a tendency to return to the initial position; A sliding groove is provided on one end of the swing plate away from the inner ring, a connecting block is slidably arranged in the sliding groove, and the connecting block is connected to the first elastic member; Second elastic members are arranged on both sides of the plurality of swing plates, and the second elastic members can maintain the initial position of the swing plate inside the teeth or make the swing plate have a tendency to restore the initial position.

2. The hydraulic power device according to claim 1, characterized in that: The outer shell includes a gear cover and a gear housing, and the gear cover and the gear housing are detachably connected. After the inner ring is nested in the gear housing, the gear cover is connected to the gear housing to limit the inner ring from being separated from the gear housing.

3. The hydraulic power device according to claim 1, characterized in that: The inner ring of the first gear is connected to a driving shaft, and the inner ring of the second gear is connected to a damping shaft. The driving shaft drives the first gear to rotate to drive the second gear to rotate, and the damping shaft provides resistance so that the second gear is driven by the first gear. The resistance provided by the damping shaft is positively correlated with the viscosity of the liquid.

4. The hydraulic power device according to claim 3, characterized in that: An electromagnetic restriction ring sleeve is provided on the outer periphery of the damping shaft, and the electromagnetic restriction ring sleeve provides resistance to the damping shaft when power is supplied.

5. The hydraulic power device according to claim 4, characterized in that: A shaft seal is disposed in the housing, and a first sealing hole and a second sealing hole are formed on the shaft seal. The drive shaft is located in the first sealing hole, and the electromagnetic restriction ring sleeve is fixed in the second sealing hole.

6. The hydraulic power device according to claim 1, characterized in that: A limiting block is arranged in the telescopic slot, and the limiting block limits the distance that the wedge block extends out of the telescopic slot.

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