Hydrodynamic torsional vibration damper

Abstract

The hydraulic damping torsional damper relates to the technical field of dampers and comprises a driving part, a driven part and a limiting piece. The driving part comprises a shell, the driven part comprises a rotating disc, and the limiting piece comprises a protrusion and a groove. The support blocks are arranged at intervals from the groove bottoms of the sliding grooves to avoid friction caused by abutment of the support blocks and the shell surface. When the driving part and the driven part rotate relative to each other, the two shells rotate relative to the rotating disc. One of the support blocks abuts one end of the sliding groove and is separated from one end of the sliding groove, and the protrusion is located in the groove, so that the support block is relatively stationary relative to the rotating disc and does not contact the shell. The other support block is separated from the other end of the sliding groove and abuts the other end of the sliding groove, so that the support block is relatively stationary relative to the shell and does not contact the rotating disc. Thus, friction between the support blocks and the rotating disc and the shell is avoided, the operating noise and wear of the damper are reduced, and the overall service life and working reliability of the damper are ensured.

Description

Technical Field

[0001] This invention relates to the field of vibration damper technology, and in particular to a hydraulically damped torsional vibration damper. Background Technology

[0002] In power transmission systems, engine output torque exhibits periodic fluctuations, and the operating conditions of the load equipment are easily affected by external environmental factors, leading to dynamic changes. This can easily induce torsional vibrations and impact loads in the transmission chain, affecting system stability and accelerating component wear. Torsional vibration dampers are core functional components in power transmission systems used to attenuate torsional vibrations and buffer impacts. Based on their damping principles, common torsional vibration dampers include rubber viscoelastic torsional dampers, friction-damped torsional dampers, and hydraulically damped torsional dampers. Each type of damper typically uses elastic elements to provide torsional stiffness and buffering capacity. Rubber dampers rely on the viscoelastic deformation of rubber elements to absorb and dissipate vibration energy, resulting in a simple and compact structure, but limitations in temperature resistance and fatigue life. Friction-damped dampers dissipate vibration energy through the relative sliding of friction pairs, providing a direct damping effect, but are susceptible to wear. Hydraulic damping torsional vibration dampers rely on the viscous resistance of the fluid medium to dissipate vibration energy. At the same time, circumferentially arranged springs provide torsional stiffness, working together to complete the system's natural frequency tuning and impact buffering. They are characterized by smooth damping characteristics, wide vibration reduction bandwidth, and high operational reliability, and are widely used in transmission systems in fields such as automotive power and engineering machinery.

[0003] Existing hydraulically damped torsional vibration dampers typically utilize the combination of an internal damping cavity, flow channel structure, and damping medium, along with the stiffness characteristics of a spring, to generate damping torque and elastic restoring force during the relative torsional motion of the internal and external components. This effectively attenuates torsional vibrations and ensures smooth power transmission. However, the support block used to support and limit the spring maintains constant contact with the damper housing surface, leading to friction between the support block and the housing. This friction easily induces operating noise in the damper, while also accelerating wear and reducing its overall service life and operational reliability.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a hydraulically damped torsional vibration damper to address the problems existing in current hydraulically damped torsional vibration dampers.

[0006] The above objectives are achieved through the following technical solutions: A hydraulically damped torsional vibration damper, comprising: The active unit includes two annular and coaxial housings, which are arranged opposite to each other and together form a sealed chamber. The driven part includes a turntable coaxial with and rotatably connected to the housing. A damping part is formed between the outer side of the turntable and the two housings. A sliding hole is formed on the turntable along its circumference. Multiple sliding holes are evenly distributed along the circumference of the turntable. Two support blocks are slidably disposed in each sliding hole. The two support blocks are arranged opposite each other and a spring is provided between them. The spring is used to make the two support blocks tend to move away from each other. The support blocks can abut against the ends of the sliding holes. Sliding grooves are formed on the surfaces of the two housings that are close to each other. The support blocks can slide in the sliding grooves. The support blocks are spaced apart from the bottom of the sliding grooves, and the support blocks can also abut against the ends of the sliding grooves. When the housing and the turntable rotate relative to each other, the sliding grooves and sliding holes coincide or are offset in the circumferential direction. The limiting member includes a protrusion and a groove, the protrusion being provided at one of the support block and the end of the sliding hole, and the groove being provided at the other of the support block and the end of the sliding hole, wherein the protrusion is located in the groove when the support block abuts against the end of the sliding hole.

[0007] Furthermore, both the raised edges and the groove edges have guide surfaces.

[0008] Furthermore, the dimensions of the protrusions and grooves in the circumferential direction of the turntable are much smaller than the dimensions of the sliding holes in the circumferential direction of the turntable.

[0009] Furthermore, the dimensions of the protrusions and grooves in the radial direction of the turntable are both smaller than the dimensions of the sliding holes in the radial direction of the turntable.

[0010] Furthermore, the driven part also includes a spacer ring coaxially disposed on the outer edge of the turntable. A damping cavity is formed between the outer wall of the spacer ring and the two housings. The damping cavity is filled with a damping medium, and the damping part is located inside the damping cavity. The damping part includes a first damping block and a second damping block. The first damping block is disposed between the two housings. The inner side of the first damping block is spaced apart from the outer wall of the spacer ring, and the outer side of the first damping block is spaced apart from the housing. The second damping block is disposed on the outer wall of the spacer ring. Multiple first damping blocks and second damping blocks are evenly distributed along the circumference of the housing and are alternately arranged.

[0011] Furthermore, an inner cavity is formed between the inner wall of the spacer ring and the two shells, allowing the damping medium to flow between the inner cavity and the damping cavity via the spacer ring. The spacer ring includes multiple coaxial and sequentially connected arc-shaped plates, the number of which is equal to the number of the second damping blocks. The outer side of the second damping blocks is spaced apart from the shells. The second damping block includes two connecting blocks, which are respectively located at the ends of two adjacent arc-shaped plates that are close to each other. An elastic connector is provided between the two connecting blocks, which is used to make the two connecting blocks tend to move closer to each other.

[0012] Furthermore, a rod is formed radially on the outer side of the turntable, and a side hole for the rod to extend into is formed between the two connecting blocks. The rod has inclined surfaces on both sides in the axial direction of the turntable so that the size of the rod in the axial direction of the turntable gradually decreases from the inside to the outside along the radial direction of the turntable. A sealing strip is formed on both sides of the side hole in the axial direction of the turntable. The length direction of the sealing strip is parallel to the tangent of the turntable. The sealing strip can abut against or detach from the inclined surface. When the sealing strip abuts against the inclined surface, the side hole is blocked, and when the sealing strip detaches from the inclined surface, the side hole is opened.

[0013] Furthermore, the arc-shaped plate abuts against the two housings on both sides of the turntable in the axial direction, and the connecting block is spaced apart from the two housings on both sides of the turntable in the axial direction.

[0014] Furthermore, the protrusions and grooves are located at the center of the turntable's axial dimension.

[0015] Furthermore, two springs are provided between the two opposing support blocks.

[0016] The present invention has at least the following beneficial effects: The support block and the bottom of the slide groove are spaced apart to avoid friction caused by the support block abutting against the surface of the housing. At the same time, for the two support blocks in the slide hole and the slide groove, when the driving part and the driven part rotate relative to each other, the two housings rotate relative to the turntable. One support block abuts against one end of the slide hole and disengages from one end of the slide groove, with the protrusion located in the groove, so that the support block is relatively stationary with respect to the turntable and does not contact the housing. The other support block disengages from the other end of the slide hole and abuts against the other end of the slide groove, so that the support block is relatively stationary with respect to the housing and does not contact the turntable. This avoids friction between the support block and the turntable and housing, reduces the operating noise and wear of the vibration damper, and to a certain extent ensures the overall service life and operational reliability of the vibration damper. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a hydraulically damped torsional vibration damper provided in an embodiment of the present invention; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Sectional view along axis AA; Figure 4 for Figure 1 Exploded view of the parts; Figure 5 for Figure 1 A schematic diagram of the structure after concealing a shell; Figure 6 for Figure 5 A magnified view of a section at point B in the middle; Figure 7 for Figure 5Top view; Figure 8 for Figure 7 CC-direction sectional view; Figure 9 for Figure 8 A magnified view of a section at point D; Figure 10 for Figure 5 A schematic diagram showing the state when the driving part and the driven part rotate synchronously; Figure 11 for Figure 10 A magnified view of a section at point E in the middle; Figure 12 for Figure 10 Top view; Figure 13 for Figure 12 FF section view; Figure 14 for Figure 13 A magnified view of a section at point G.

[0018] in: 101. Housing; 102. Turntable; 103. Sliding hole; 104. Support block; 105. Spring; 106. Sliding groove; 107. Protrusion; 108. Groove; 109. Inner sealing plate; 110. Bushing; 111. Spacer ring; 112. First damping block; 113. Second damping block; 114. Arc plate; 115. Connecting block; 116. Elastic connector; 117. Rod; 118. Side hole; 119. Inclined surface; 120. Sealing strip; 121. Sleeve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1 to 14 As shown, this embodiment of the invention provides a hydraulically damped torsional vibration damper (hereinafter referred to as the damper), including an active part, a driven part, and a limiting member. The active part includes two annular and coaxial housings 101, which are arranged opposite to each other and together form a sealed chamber. The driven part includes a turntable 102 coaxial with and rotatably connected to the housings 101, and a damping part is formed between the outer side of the turntable 102 and the two housings 101. A sliding hole 103 is formed on the turntable 102 along its circumference, and multiple sliding holes 103 are evenly distributed along the circumference of the turntable 102. Two support blocks 104 are slidably disposed in each sliding hole 103. The two support blocks 104 are arranged opposite to each other and a spring 105 is disposed between them. The spring 105 is used to make the two support blocks 104 tend to move away from each other. The support block 104 can abut against the end of the sliding hole 103; both surfaces of the two housings 101 that are close to each other are formed with sliding grooves 106, and the support block 104 can slide in the sliding grooves 106. The support block 104 and the bottom of the sliding grooves 106 are spaced apart, and the support block 104 can also abut against the end of the sliding grooves 106; when the housings 101 and the turntable 102 rotate relative to each other, the sliding grooves 106 and the sliding holes 103 coincide or are offset in the circumferential direction; the limiting member includes a protrusion 107 and a groove 108. The protrusion 107 is provided at one of the ends of the support block 104 and the sliding hole 103, and the groove 108 is provided at the other end of the support block 104 and the sliding hole 103. When the support block 104 abuts against the end of the sliding hole 103, the protrusion 107 is located in the groove 108.

[0023] The support block 104 and the bottom of the slide groove 106 are spaced apart to avoid friction caused by the support block 104 abutting against the surface of the housing 101. At the same time, for the two support blocks 104 in the slide hole 103 and the slide groove 106, when the driving part and the driven part rotate relative to each other, the two housings 101 rotate relative to the turntable 102. One support block 104 abuts against one end of the slide hole 103 and disengages from one end of the slide groove 106, and the protrusion 107 is located in the groove 108, so that the support block 104 is relatively stationary with respect to the turntable 102 and does not contact the housing 101. The other support block 104 disengages from the other end of the slide hole 103 and abuts against the other end of the slide groove 106, so that the support block 104 is relatively stationary with respect to the housing 101 and does not contact the turntable 102. This avoids friction between the support block 104 and the turntable 102 and the housing 101, reduces the operating noise and wear of the vibration damper, and to a certain extent ensures the overall service life and working reliability of the vibration damper.

[0024] The housing 101 is generally annular, and both housings 101 are connected to the power input end to achieve torque input. The outer edges of the two housings 101 abut against each other and are provided with a sealing structure to ensure the sealing of the outer edges of the two housings 101. The inner sides of the two housings 101 do not contact each other. The turntable 102 has inner sealing plates 109 on both sides in the axial direction. The outer edge of the inner sealing plate 109 abuts against the inner side of the housing 101 and is provided with a sealing structure to ensure the sealing of the inner sides of the two housings 101. The driven part also includes a bushing 110. The turntable 102 has a central hole, and the bushing 110 is inserted into the central hole. The turntable 102, bushing 110 and inner sealing plate 109 are fixed to each other by bolts, and all three are coaxially arranged with the housing 101. The bushing 110 can be connected to the power output end through a spline hole to achieve torque output. The turntable 102 has a split structure, which makes it easier to machine protrusions 107 or grooves 108 at the end of the sliding hole 103.

[0025] The damping part can be friction damping or hydraulic damping, preferably hydraulic damping, to generate damping force between the driving and driven parts, ensuring the shock absorber's buffering capacity. The spring 105 is a compression spring, and two springs 105 are provided between two opposing support blocks 104 to enhance the torsional stiffness of the shock absorber. Preferably, a protrusion 107 is provided on the support block 104, and a groove 108 is provided at the end of the sliding hole 103. Of course, the protrusion 107 can also be provided at the end of the sliding hole 103, in which case the groove 108 is provided on the support block 104.

[0026] A sliding hole 103 penetrates the turntable 102, and the overall shape of the sliding hole 103 is a fan-shaped annular hole, i.e., a non-complete annular structure. The center of the sliding hole 103 coincides with the axis of the turntable 102, so that the trajectory of the sliding hole 103 is set along the circumference of the turntable 102. In the circumferential direction of the turntable 102, the size of the support block 104 is smaller than the size of the sliding hole 103, so that the support block 104 can slide along the sliding hole 103. In the radial direction of the turntable 102, the size of the support block 104 is smaller than or equal to the size of the sliding hole 103, so as to provide stable support and guidance for the sliding of the support block 104.

[0027] The sliding hole 103 and the sliding groove 106 have the same shape and size. When both the power input end and the power output end are stationary and there is no relative torsion, both the driving part and the driven part are in a non-working state, and the sliding hole 103 and the sliding groove 106 coincide in the circumferential direction. As for the two support blocks 104 in the sliding hole 103 and the sliding groove 106, the two support blocks 104 abut against the two ends of the sliding hole 103 respectively, the two protrusions 107 are located in the corresponding grooves 108 respectively, and the two support blocks 104 abut against the two ends of the sliding groove 106 respectively.

[0028] When the power input end and power output end twist relative to each other, both the driving and driven parts are in operation, and the sliding hole 103 and the sliding groove 106 are offset circumferentially. For the two support blocks 104 within the sliding hole 103 and the sliding groove 106, one support block 104 abuts against one end of the sliding hole 103 and disengages from one end of the sliding groove 106, with the protrusion 107 located within the groove 108; the other support block 104 disengages from the other end of the sliding hole 103 and abuts against the other end of the sliding groove 106. For example, in... Figure 4 and Figure 7 In the middle, for the leftmost sliding hole 103 and sliding groove 106, the upper support block 104 abuts against the upper end of the sliding hole 103, the upper support block 104 disengages from the upper end of the sliding groove 106, and the protrusion 107 of the upper support block 104 is located in the groove 108 at the upper end of the sliding hole 103; the lower support block 104 disengages from the lower end of the sliding hole 103, the lower support block 104 abuts against the lower end of the sliding groove 106, and the protrusion 107 of the lower support block 104 disengages from the groove 108 at the lower end of the sliding hole 103.

[0029] In one embodiment, both the edge of the protrusion 107 and the edge of the groove 108 are formed with guide surfaces, which facilitate the protrusion 107 to move into the groove 108 when the support block 104 slides in the sliding hole 103.

[0030] The inlet surface can be achieved by chamfering the groove 108 of the protrusion 107.

[0031] In one embodiment, the dimensions of the protrusion 107 and the groove 108 in the circumferential direction of the turntable 102 are both much smaller than the dimensions of the sliding hole 103 in the circumferential direction of the turntable 102.

[0032] When the support block 104 slides along the sliding hole 103 and the end of the support block 104 does not abut against the sliding hole 103, the size of the protrusion 107 and the groove 108 in the circumferential direction of the turntable 102 is small, which can avoid the protrusion 107 and the groove 108 from contacting each other in advance and causing collisions and friction, thereby further reducing the operating noise and wear of the vibration damper, and to a certain extent ensuring the overall service life and working reliability of the vibration damper.

[0033] In one embodiment, the dimensions of the protrusion 107 and the groove 108 in the radial direction of the turntable 102 are both smaller than the dimensions of the sliding hole 103 in the radial direction of the turntable 102.

[0034] When the support block 104 abuts against the end of the sliding hole 103, the protrusion 107 is located in the groove 108. The protrusion 107 and the groove 108 have a large radial dimension on the turntable 102, which can prevent the support block 104 from moving in other directions, thereby avoiding friction between the support block 104 and the turntable 102 due to relative movement, improving the support stability of the support block 104, further reducing the operating noise and wear of the vibration damper, and to a certain extent ensuring the overall service life and working reliability of the vibration damper.

[0035] In one embodiment, the driven part further includes a spacer ring 111 coaxially disposed on the outer edge of the turntable 102. The outer wall of the spacer ring 111 and the two housings 101 together form a damping cavity, which is filled with a damping medium, and the damping part is located in the damping cavity. The damping part includes a first damping block 112 and a second damping block 113. The first damping block 112 is disposed between the two housings 101. The inner side of the first damping block 112 is spaced apart from the outer wall of the spacer ring 111, and the outer side of the first damping block 112 is spaced apart from the housing 101. The second damping block 113 is disposed on the outer wall of the spacer ring 111. Multiple first damping blocks 112 and second damping blocks 113 are evenly distributed along the circumference of the housing 101 and are alternately arranged.

[0036] Because the inner side of the first damping block 112 is spaced apart from the outer wall of the spacer ring 111, and the outer side of the first damping block 112 is spaced apart from the housing 101, the gaps on both the inner and outer sides of the first damping block 112 form small medium flow channels. When the active part and the driven part rotate relative to each other, the two housings 101 and the first damping block 112 rotate relative to the turntable 102 and the second damping block 113. The first damping block 112 and the second damping block 113 move closer or further apart from each other, so that the damping medium in the damping cavity circulates on both sides of the first damping block 112, thereby generating a damping force between the two housings 101 and the turntable 102, that is, between the active part and the driven part, ensuring the buffering capacity of the shock absorber.

[0037] The damping medium is damping oil, specifically mineral-based damping oil or silicone oil. The first damping block 112 is fixed between the two housings 101. The first damping block 112 is provided with a sleeve 121. The length direction of the sleeve 121 is parallel to the axial direction of the housing 101, and both ends of the sleeve 121 pass through the two housings 101 respectively. The sleeve 121 allows the housing 101 to be connected to the power input end to realize torque input.

[0038] In one embodiment, an inner cavity is formed between the inner wall of the spacer ring 111 and the two housings 101, and the damping medium can flow between the inner cavity and the damping cavity through the spacer ring 111. The spacer ring 111 includes a plurality of coaxial and sequentially connected arc-shaped plates 114, the number of arc-shaped plates 114 being equal to the number of second damping blocks 113, and the outer side of the second damping blocks 113 being spaced apart from the housings 101. The second damping block 113 includes two connecting blocks 115, the two connecting blocks 115 being respectively located at the ends of two adjacent arc-shaped plates 114 that are close to each other, and an elastic connector 116 being provided between the two connecting blocks 115, the elastic connector 116 being used to make the two connecting blocks 115 tend to move closer to each other.

[0039] When the shock absorber is in operation or not, some of the damping medium in the damping cavity flows to the inner cavity through the spacer ring 111, forming an oil film to lubricate components such as the support block 104 and spring 105 within the inner cavity. This reduces sliding friction and wear between components, further reducing the operating noise and wear of the shock absorber, and to a certain extent ensuring the overall service life and operational reliability of the shock absorber. Additionally, the reciprocating extension and retraction of the spring 105 generates internal friction heat and mating surface friction heat. The flow of the damping medium dissipates heat from the spring 105, preventing fatigue performance degradation due to high temperatures. Simultaneously, the damping medium isolates air and moisture, preventing corrosion of metal components such as the support block 104 and spring 105, thus improving the operational reliability of the shock absorber under complex operating conditions. However, because some of the damping medium in the damping cavity flows to the inner cavity through the spacer ring 111, the amount of damping medium in the damping cavity decreases, thereby reducing the damping force between the active and driven parts and the shock absorber's buffering capacity.

[0040] When the active and driven parts rotate synchronously, the centrifugal force generated causes all the arc-shaped plates 114 to disperse outwards and separate from the outer edge of the turntable 102. The two connecting blocks 115 overcome the elastic force of the elastic connector 116 and move away from each other, creating a gap. This state is as follows: Figure 11As shown, this allows the damping medium in the inner cavity to flow back into the damping cavity more easily, replenishing the damping medium within the damping cavity, thereby ensuring the damping force between the active and driven parts and the buffering capacity of the shock absorber. When both the active and driven parts are stationary, the centrifugal force disappears, and the elastic connector 116 brings the two connecting blocks 115 closer together. All the arc-shaped plates 114 surround and converge towards the center, pressing tightly against the outer edge of the turntable 102, and the gap between the two connecting blocks 115 disappears. This state is as follows: Figure 6 As shown, to a certain extent, the damping medium in the damping cavity is suppressed from flowing into the inner cavity through the diaphragm 111.

[0041] The connecting block 115 protrudes outward from the arc-shaped plate 114 and extends into the damping cavity. The elastic connector 116 can be an elastic rubber strip. Both connecting blocks 115 share a through hole, through which the elastic connector 116 passes. Limiting blocks are provided at both ends of the elastic connector 116, thereby elastically connecting the two connecting blocks 115. The elastic connector 116 causes the two connecting blocks 115 to tend to move closer together, thus causing all the arc-shaped plates 114 to tend to converge towards the center and adhere tightly to the outer edge of the turntable 102. Centrifugal force can disperse all the arc-shaped plates 114 in all directions and separate them from the outer edge of the turntable 102. In other embodiments not shown, the elastic connector 116 can also be a tension spring, with its two ends fixed to the two connecting blocks 115 respectively.

[0042] In one embodiment, a rod 117 is formed radially on the outer side of the turntable 102, and a side hole 118 for the rod 117 to extend into is formed between two connecting blocks 115. The rod 117 has inclined surfaces 119 on both sides in the axial direction of the turntable 102, so that the size of the rod 117 in the axial direction of the turntable 102 gradually decreases from the inside to the outside in the radial direction of the turntable 102. A sealing strip 120 is formed on both sides of the side hole 118 in the axial direction of the turntable 102. The length direction of the sealing strip 120 is parallel to the tangent of the turntable 102. The sealing strip 120 can abut against or detach from the inclined surface 119. When the sealing strip 120 abuts against the inclined surface 119, the side hole 118 is blocked, and when the sealing strip 120 detaches from the inclined surface 119, the side hole 118 is opened.

[0043] When the driving and driven parts rotate synchronously, the resulting centrifugal force causes all the arc-shaped plates 114 to disperse outwards and separate from the outer edge of the turntable 102. The two connecting blocks 115 overcome the elastic force of the elastic connector 116 and move away from each other. At the same time, the two connecting blocks 115 slide radially outwards relative to the rod 117 along the turntable 102, causing the sealing strip 120 to disengage from the inclined surface 119, and the side hole 118 to be opened. This state is as follows: Figure 14As shown, the damping medium in the inner cavity can more easily flow back to the damping cavity to replenish the damping medium in the damping cavity, thereby further ensuring the damping force between the active and driven parts and the buffering capacity of the shock absorber. When both the active and driven parts are stationary, the centrifugal force disappears, and the elastic connector 116 brings the two connecting blocks 115 closer to each other. All the arc plates 114 surround and close to the center and adhere to the outer edge of the turntable 102. The two connecting blocks 115 slide radially inward relative to the rod 117 along the turntable 102, so that the sealing strip 120 abuts against the inclined surface 119. This state is as follows. Figure 9 As shown, the side hole 118 is blocked, further inhibiting the flow of the damping medium in the damping cavity to the inner cavity through the diaphragm ring 111.

[0044] When the turntable 102 rotates, it can drive all the arc plates 114, i.e. the spacers 111, to rotate synchronously through the cooperation of the rod 117 and the side hole 118. The two connecting blocks 115 and the rod 117 are provided with through holes, and the elastic connector 116 passes through the through holes.

[0045] In one embodiment, the arc plate 114 abuts against the two housings 101 on both sides of the turntable 102 in the axial direction, and the connecting block 115 is spaced apart from the two housings 101 on both sides of the turntable 102 in the axial direction.

[0046] The damping medium can flow between the inner cavity and the damping cavity through the partition ring 111. Specifically, the inner cavity and the damping cavity are isolated from each other at the arc plate 114 and connected to each other at the connecting block 115, so that the internal and external flow of the damping medium can only be concentrated at the connecting block 115, and the damping medium in the damping cavity can also be suppressed from flowing into the inner cavity through the partition ring 111.

[0047] In one embodiment, the protrusion 107 and the groove 108 are located at the middle of the axial dimension of the turntable 102 to reduce the impact on the flow of the damping medium.

[0048] The working principle of this invention is as follows: The housing 101 is connected to the power input end to achieve torque input, and the turntable 102 is connected to the power output end to achieve torque output, thereby realizing torque transmission between the power input end and the power output end. When the power input end and the power output end experience relative torsion, the active part and the driven part rotate relative to each other, and the two housings 101 rotate relative to the turntable 102. The support block 104 drives the spring 105 to compress for vibration damping. At the same time, the first damping block 112 and the second damping block 113 move closer or further away from each other, so that the damping medium in the damping cavity circulates on both sides of the first damping block 112, thereby generating a damping force between the two housings 101 and the turntable 102, that is, between the active part and the driven part, to ensure the buffering capacity of the shock absorber.

[0049] The support block 104 and the bottom of the groove 106 are spaced apart, meaning the support block 104 is relatively thin, to avoid friction caused by the support block 104 abutting against the surface of the housing 101. Simultaneously, for the two support blocks 104 within the sliding hole 103 and the groove 106, when the driving part and the driven part rotate relative to each other, one support block 104 abuts against one end of the sliding hole 103 and disengages from one end of the groove 106, with the protrusion 107 located within the groove 108, making this support block 104 relatively stationary with respect to the turntable 102 and not in contact with the housing 101; the other support block 104 disengages from the other end of the sliding hole 103 and abuts against the other end of the groove 106, making this support block 104 relatively stationary with respect to the housing 101 and not in contact with the turntable 102. This avoids friction between the support block 104 and the turntable 102 and the housing 101, reducing the operating noise and wear of the vibration damper, and to a certain extent ensuring the overall service life and operational reliability of the vibration damper.

[0050] When the active and driven parts rotate synchronously, the centrifugal force generated causes all the arc plates 114 to disperse in all directions and separate from the outer edge of the turntable 102. The two connecting blocks 115 overcome the elastic force of the elastic connector 116 and move away from each other, creating a gap. At the same time, the two connecting blocks 115 slide outward along the radial direction of the turntable 102 relative to the rod 117, causing the sealing strip 120 to disengage from the inclined surface 119 and the side hole 118 to be opened. The gap between the two connecting blocks 115 and the side hole 118 make it easier for the damping medium in the inner cavity to flow back to the damping cavity to replenish the damping medium in the damping cavity, thereby ensuring the damping force between the active and driven parts and the buffering capacity of the shock absorber. When both the active and driven parts are stationary, the centrifugal force disappears, and the elastic connector 116 brings the two connecting blocks 115 closer to each other. All the arc plates 114 surround and close to the center and adhere to the outer edge of the turntable 102. The gap between the two connecting blocks 115 disappears. At the same time, the two connecting blocks 115 slide radially inward relative to the rod 117 along the turntable 102, so that the sealing strip 120 abuts against the inclined surface 119, and the side hole 118 is blocked. The gap between the two connecting blocks 115 and the side hole 118 disappear, which to a certain extent inhibits the damping medium in the damping cavity from flowing into the inner cavity through the spacer ring 111.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A hydraulically damped torsional vibration damper, characterized in that, include: The active unit includes two annular and coaxial housings, which are arranged opposite to each other and together form a sealed chamber. The driven part includes a turntable coaxial with and rotatably connected to the housing. A damping part is formed between the outer side of the turntable and the two housings. A sliding hole is formed on the turntable along its circumference. Multiple sliding holes are evenly distributed along the circumference of the turntable. Two support blocks are slidably disposed in each sliding hole. The two support blocks are arranged opposite each other and a spring is provided between them. The spring is used to make the two support blocks tend to move away from each other. The support blocks can abut against the ends of the sliding holes. Sliding grooves are formed on the surfaces of the two housings that are close to each other. The support blocks can slide in the sliding grooves. The support blocks are spaced apart from the bottom of the sliding grooves, and the support blocks can also abut against the ends of the sliding grooves. When the housing and the turntable rotate relative to each other, the sliding grooves and sliding holes coincide or are offset in the circumferential direction. The limiting member includes a protrusion and a groove, the protrusion being provided at one of the support block and the end of the sliding hole, and the groove being provided at the other of the support block and the end of the sliding hole, wherein the protrusion is located in the groove when the support block abuts against the end of the sliding hole.

2. The hydraulically damped torsional vibration damper according to claim 1, characterized in that, Both the raised edges and the groove edges have guide surfaces.

3. The hydraulically damped torsional vibration damper according to claim 1, characterized in that, The dimensions of the protrusions and grooves in the circumferential direction of the turntable are much smaller than the dimensions of the sliding holes in the circumferential direction of the turntable.

4. The hydraulically damped torsional vibration damper according to claim 3, characterized in that, The dimensions of the protrusions and grooves in the radial direction of the turntable are both smaller than the dimensions of the sliding holes in the radial direction of the turntable.

5. The hydraulically damped torsional vibration damper according to claim 1, characterized in that, The driven part also includes a spacer ring coaxially disposed on the outer edge of the turntable. A damping cavity is formed between the outer wall of the spacer ring and the two housings. The damping cavity is filled with a damping medium, and the damping part is located in the damping cavity. The damping part includes a first damping block and a second damping block. The first damping block is disposed between the two housings. The inner side of the first damping block is spaced apart from the outer wall of the spacer ring, and the outer side of the first damping block is spaced apart from the housing. The second damping block is disposed on the outer wall of the spacer ring. Multiple first damping blocks and second damping blocks are evenly distributed along the circumference of the housing and are alternately arranged.

6. The hydraulically damped torsional vibration damper according to claim 5, characterized in that, An inner cavity is formed between the inner wall of the spacer ring and the two shells, allowing the damping medium to flow between the inner cavity and the damping cavity through the spacer ring. The spacer ring includes multiple coaxial and sequentially connected arc-shaped plates, the number of which is equal to the number of the second damping blocks. The outer side of the second damping blocks is spaced apart from the shells. The second damping block includes two connecting blocks, which are respectively located at the ends of two adjacent arc-shaped plates that are close to each other. An elastic connector is provided between the two connecting blocks, which is used to make the two connecting blocks tend to move closer to each other.

7. The hydraulically damped torsional vibration damper according to claim 6, characterized in that, A rod is formed radially on the outer side of the turntable. A side hole for the rod to extend into is formed between two connecting blocks. The rod has inclined surfaces on both sides in the axial direction of the turntable so that the size of the rod in the axial direction of the turntable gradually decreases from the inside to the outside along the radial direction of the turntable. A sealing strip is formed on both sides of the side hole in the axial direction of the turntable. The length direction of the sealing strip is parallel to the tangent of the turntable. The sealing strip can abut against or detach from the inclined surface. When the sealing strip abuts against the inclined surface, the side hole is blocked. When the sealing strip detaches from the inclined surface, the side hole is opened.

8. The hydraulically damped torsional vibration damper according to claim 6, characterized in that, The arc-shaped plate abuts against the two housings on both sides of the turntable's axial direction, and the connecting block is spaced apart from the two housings on both sides of the turntable's axial direction.

9. The hydraulically damped torsional vibration damper according to claim 1, characterized in that, The protrusions and grooves are located in the middle of the turntable's axial dimension.

10. The hydraulically damped torsional vibration damper according to claim 1, characterized in that, Two springs are provided between the two support blocks that are positioned opposite each other.

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