Friction type bidirectional backstop

Abstract

The utility model discloses a friction type two-way backstop which comprises a driving disc, a matching piece, a driven shaft and a plurality of expansion sleeves. A first special-shaped hole is formed in the driving disc; a first special-shaped bulge matched with the first special-shaped hole is formed on one side corresponding to the driving disc, the first special-shaped bulge is inserted into the first special-shaped hole, a second special-shaped hole is formed on the inner side of one end far away from the first special-shaped bulge, and an annular wear-resistant part is formed on the outer side of one end far away from the first special-shaped bulge; a second special-shaped protrusion is formed on the outer side of the driven shaft sleeve and inserted into the second special-shaped hole, and when the driving disc is actively driven, the driving disc extrudes the first special-shaped protrusion through the first special-shaped hole, so that the multiple expansion sleeves are contracted inwards, the abrasion-resistant part and the abrasion-resistant groove are separated, and the second special-shaped protrusion is tightly held through the expansion sleeves to drive rotation. And when the driving disc stops driving, the second special-shaped protrusions extrude the second special-shaped holes, so that the multiple expansion sleeves expand outwards, and the wear-resisting parts and the wear-resisting grooves are in butt joint to prevent the driven shaft sleeve from rotating.

Description

Technical Field

[0001] The utility model relates to the technical field of backstops, in particular to a friction type bidirectional backstop. Background Technique

[0002] In the prior art, a backstop is a device that enables the drive shaft to be free from forward or reverse rotation and drives the driven shaft to rotate synchronously. Conversely, the reverse torque generated by the driven shaft without being affected by the load cannot cause the driven shaft to rotate automatically. It plays a crucial role in realizing the function of forward transmission and reverse torque blocking in the structure.

[0003] In the prior art, the structures of backstops are diverse, such as ball type, wedge type, etc. At present, the ball type backstop has problems such as high manufacturing precision and high production cost; while the wedge type backstop has problems such as large local stress, small stress area, and accelerated wear resulting in short service life.

[0004] Therefore, there is still a need for a friction type bidirectional backstop to solve the above problems. Content of the Utility Model

[0005] The utility model provides a friction type bidirectional backstop for solving the above problems.

[0006] The purpose of the utility model is achieved by adopting the following technical solutions:

[0007] A friction type bidirectional backstop, comprising:

[0008] A driving disk, which is used to connect the driving shaft, and a first special-shaped hole is formed inside the driving disk;

[0009] A plurality of expansion sleeves, which are arranged in a ring-shaped combination. On one side corresponding to the driving disk, a first special-shaped protrusion that cooperates with the first special-shaped hole is formed. The first special-shaped protrusion is inserted into the first special-shaped hole, and a second special-shaped hole is formed inside the end far from the first special-shaped protrusion, and a wear-resistant part in the shape of a ring is formed on the outside;

[0010] A fitting part, and a wear-resistant groove that cooperates with the wear-resistant part is formed inside the annular shape of the fitting part;

[0011] A driven shaft sleeve, and a second special-shaped protrusion is formed on the outside of the driven shaft sleeve. The second special-shaped protrusion is inserted into the second special-shaped hole. When the driving disk is driven actively, the driving disk presses the first special-shaped protrusion through the first special-shaped hole, causing the plurality of expansion sleeves to contract inward and separating the wear-resistant part and the wear-resistant groove, and driving the rotation by clamping the second special-shaped protrusion through the expansion sleeves;

[0012] When the driving disk stops driving, the second special-shaped protrusion presses the second special-shaped hole, causing the plurality of expansion sleeves to expand outward and docking the wear-resistant part and the wear-resistant groove to prevent the driven shaft sleeve from rotating.

[0013] In one embodiment, the cross-sectional shapes of the first special-shaped protrusion and the first special-shaped hole are the same, the cross-sectional shapes of the second special-shaped protrusion and the second special-shaped hole are the same, the cross-sectional area of the first special-shaped protrusion is larger than that of the second special-shaped protrusion, and the cross-sectional area of the first special-shaped hole is larger than that of the second special-shaped hole.

[0014] In one embodiment, the number of the expansion sleeves is 3, and the cross-section of each expansion sleeve is a sector shape with a central angle of 120 degrees.

[0015] In one embodiment, the cross-sectional shapes of the first special-shaped protrusion and the first special-shaped hole are both triangles with outward convex rounded corners.

[0016] In one embodiment, a protrusion is formed on the inner side of the expansion sleeve corresponding to the second special-shaped hole, the protrusion is used to abut against the second special-shaped protrusion, the protrusion extends towards the inner side of the second special-shaped hole, and a concave portion is formed in the middle section of the protrusion.

[0017] In one embodiment, the annular wear-resistant portion is formed on the V-shaped edge of the expansion sleeve, the wear-resistant groove is a V-shaped groove, or the annular wear-resistant portion is a W-shaped edge, and the wear-resistant groove is a W-shaped groove.

[0018] In one embodiment, a connecting groove and a spring are further provided on the expansion sleeve, one end of the spring is connected in the connecting groove, and adjacent expansion sleeves can be connected through the spring.

[0019] In one embodiment, the connecting grooves on two adjacent expansion sleeves are communicated for elastic connection with the same spring.

[0020] In one embodiment, a first keyhole is provided on the driving disk, and a second keyhole is formed on the inner side of the driven shaft sleeve for connecting the driven shaft.

[0021] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0022] The driving disc is used to connect the power source, and the driven shaft sleeve is mainly connected to the driven disc. When power is output, the driving disc rotates and rotates a certain angle relative to the expansion sleeve. The first special-shaped hole on the inner side of the driving disc squeezes the first special-shaped protrusion of the expansion sleeve, causing the expansion sleeve to contract and tightly hold the driven shaft sleeve. When the power source of the driving disc is cut off instantaneously, the large reverse resistance generated by the driven shaft connected to the driven shaft sleeve causes the driven shaft sleeve to squeeze the second special-shaped hole through the second special-shaped protrusion, so that the expansion sleeve and the wear-resistant groove are docked and rubbed, and reverse locking is quickly and stably achieved in the form of large-area friction, preventing the large resistance of the driven shaft from being reversely transmitted to the power source and damaging the components of power output. The structure is simple and the stress area is large, so during long-term use, the wear is small, the service life is extended, and the structure is more concise. The one-way locking driven disc can provide more stable frictional force for directional locking when the power source is cut off. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the two-way backstop of the embodiment of the present utility model;

[0024] Figure 2 is the explosion of the two-way backstop of the embodiment of the present utility model Figure 1 ;

[0025] Figure 3 is the explosion of the two-way backstop of the embodiment of the present utility model Figure 2 ;

[0026] Figure 4 is the axial sectional view of the two-way backstop of the embodiment of the present utility model;

[0027] Figure 5 is the combined schematic diagram of the expansion sleeve of the two-way backstop of the embodiment of the present utility model.

[0028] In the figure: 1. Driving disc; 11. First special-shaped hole; 2. Expansion sleeve; 21. First special-shaped protrusion; 22. Second special-shaped hole; 3. Fitting; 4. Driven shaft sleeve; 41. Second special-shaped protrusion; 5. Wear-resistant part; 6. Wear-resistant groove; 7. Protruding part; 8. Depressed part; 9. Spring; 10. First keyhole; 12. Second keyhole; 13. Connecting groove. Detailed Embodiment

[0029] Now, the exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that the present utility model is more comprehensive and complete, and the concept of the exemplary embodiments is fully conveyed to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and thus their repeated description will be omitted.

[0030] The words describing positions and directions in the present utility model are all illustrated by way of the attached drawings. However, changes can be made according to needs, and all such changes are included within the protection scope of the present utility model.

[0031] Referring to Figures 1-5 , the present utility model provides a friction type bi-directional backstop, comprising: a driving disc 1, a plurality of expansion sleeves 2, a mating member 3, and a driven shaft sleeve 4.

[0032] The driving disc 1 is used for connecting to a driving shaft. A first special-shaped hole 11 is formed inside the driving disc 1; the driving disc 1 is a shaft-like part, and 45# steel can be used for blackening treatment during processing. The first special-shaped hole 11 can be a counterbore provided on one side of the driving disc 1.

[0033] The plurality of expansion sleeves 2 are arranged in a ring-shaped combination. On one side corresponding to the driving disc 1, a first special-shaped protrusion 21 that mates with the first special-shaped hole 11 is formed. The first special-shaped protrusion 21 is inserted into the first special-shaped hole 11. A second special-shaped hole 22 is formed on the inner side at one end far from the first special-shaped protrusion 21, and a wear-resistant part 5 in a ring shape is formed on the outer side. When manufacturing the expansion sleeve 2, a ring-shaped shaft-like part with a smaller outer diameter can be first manufactured and then evenly divided into multiple parts. Aluminum bronze can be used as the material. When the first special-shaped protrusion 21 is inserted into the first special-shaped hole 11, the first special-shaped hole 11 rotates and guides the plurality of expansion sleeves 2 to contract inward through chamfers, so that the outer sides of the plurality of expansion sleeves 2 no longer contact the mating member 3, and the inner side tightly holds the driven shaft sleeve 4 to drive the driven shaft sleeve 4 to rotate together.

[0034] A wear-resistant groove 6 that mates with the wear-resistant part 5 is formed on the inner side of the ring shape of the mating member 3. Anti-slip lines can be provided on the inner surface of the wear-resistant groove 6, and 45# steel can be selected as the material.

[0035] A second special-shaped protrusion 41 is formed on the outer side of the driven shaft sleeve 4. The second special-shaped protrusion 41 is inserted into the second special-shaped hole 22. When the driving disc 1 drives actively, the driving disc 1 squeezes the first special-shaped protrusion 21 through the first special-shaped hole 11, causing the plurality of expansion sleeves 2 to contract inward and separating the wear-resistant part 5 from the wear-resistant groove 6, and driving the rotation by tightly holding the second special-shaped protrusion 41 through the expansion sleeves 2.

[0036] When the driving disc 1 stops driving, the second special-shaped protrusion 41 squeezes the second special-shaped hole 22, causing the plurality of expansion sleeves 2 to expand outward and docking the wear-resistant part 5 with the wear-resistant groove 6 to prevent the driven shaft sleeve 4 from rotating relatively.

[0037] The driving disk 1 is used to connect to the driving shaft. The driving shaft can be the output shaft of a motor or the output shaft of other power sources, driving the driving disk 1 to rotate. After rotation, the first special-shaped hole 11 inside the driving disk 1 rotates a certain angle relative to the special-shaped protrusions composed of multiple expansion sleeves 2, and at the same time squeezes the expansion sleeves 2 inward to contract. The wear-resistant parts 5 on the inwardly contracting expansion sleeves 2 also leave the wear-resistant grooves at the same time, and the expansion sleeves 2 contract inward and tightly hold the second special-shaped protrusion 41 inside, so as to realize the unilateral power transmission to the driven shaft. And during one-way transmission, the friction locking and the internal power transmission are carried out in a stable order, without causing power loss of the output source and hardware damage, with high reliability, and without the need to rely on other components to complete. In addition, when the power source of the driving disk 1 is withdrawn, the reverse resistance on the driven shaft sleeve 4 will expand outward in the form of squeezing the second special-shaped hole 22 through the second special-shaped protrusion 41, so that the wear-resistant part 5 of the expansion sleeve 2 and the wear-resistant groove 6 are butted to generate friction, thereby realizing one-way locking and preventing the resistance from being transmitted to the stopped power source, resulting in damage to the power source. The modification device adopts the cooperation of the first special-shaped part and the first special-shaped hole 11, as well as the second special-shaped part and the second special-shaped hole 22, with a large contact area and a stable area size, effectively avoiding the problems of local contact and large stress, and having high stability and low failure rate.

[0038] In one embodiment, the cross-sectional shapes of the first special-shaped protrusion 21 and the first special-shaped hole 11 are the same, the cross-sectional shapes inside the second special-shaped protrusion 41 and the second special-shaped hole 22 are the same, the cross-sectional area of the first special-shaped protrusion 21 is larger than the cross-sectional area of the second special-shaped protrusion 41, and the cross-sectional area of the first special-shaped hole 11 is larger than the cross-sectional area of the second special-shaped hole 22. Among them, the cross-sectional area of the first special-shaped protrusion 21 is larger than the cross-sectional area of the second special-shaped hole 22. During power output, it can make the torque generated by the driving disk 1 greater than the resistance torque generated by the driven shaft sleeve 4, so that when the power source outputs, it is easier to drive the driven shaft on the driven shaft sleeve 4 to rotate. Effectively prevent the power source from being overloaded at the early stage of output due to excessive resistance, resulting in hardware damage, and improve the service life of the power source.

[0039] In one embodiment, the number of the expansion sleeves 2 is 3, and the cross-section of each expansion sleeve 2 is a fan shape with a 120-degree opening angle. The three expansion sleeves 2 with a 120-degree opening angle are fan-shaped distributed, and can move synchronously and evenly inward or outward during contraction and expansion, with a low failure rate, and can ensure quick separation at the moment of driving by the driving shaft. When the power source is withdrawn, the resistance generated by the driven shaft sleeve 4 and the driven shaft has a tendency to drive the multiple expansion sleeves 2 to rotate in the reverse direction. At the moment when the driven shaft sleeve 4 drives the expansion sleeve 2 to rotate relatively, the expansion sleeve 2 is squeezed and expanded by the internal driven shaft sleeve 4, and the wear-resistant part 5 and the wear-resistant groove 6 are fully abutted, completing instantaneous resistance isolation, with a large wear area and corresponding in time during isolation.

[0040] In one embodiment, the following description is made with the inner side being closer to the rotation axis and the outer side being farther from the axis. The cross-sectional shapes of the first special-shaped protrusion 21 and the first special-shaped hole 11 are both triangles with outward convex rounded corners. When the power on the driving disk 1 is transmitted and at the moment of rotation, the first special-shaped hole 11 on the driving disk 1 will rotate a certain angle relative to the first special-shaped protrusion 21. Then, the part of the first special-shaped hole 11 that protrudes towards the inner side will slide and abut against the part of the first special-shaped protrusion 21 that protrudes towards the outer side and squeeze towards the axis. Under the guidance of the outward convex rounded corners, the first special-shaped member with an outward convex triangle smoothly guides and gathers the first special-shaped protrusion 21 inside the first special-shaped hole 11, avoiding jamming and affecting the function of one-way partition.

[0041] In one embodiment, a protrusion 7 is formed on the inner side of the expansion sleeve 2 corresponding to the second special-shaped hole 22. The protrusion 7 is used to abut against the second special-shaped protrusion 41. The protrusion 7 extends towards the inner side of the second special-shaped hole 22, and the middle section of the protrusion 7 has a recess 8. The protruding section, as the protruding part extending towards the inner side in the second special-shaped hole 22, can smoothly abut against the second special-shaped protrusion 41 and be evenly diffused towards the outer side under the extrusion of the inner expansion force when rotating relative to the second special-shaped protrusion 41, completing instantaneous reverse resistance locking. The provided recess 8 in the middle section can prevent the second special-shaped protrusion 41 from rotating too large an angle when rotating in the reverse direction in the second special-shaped hole 22, resulting in the second special-shaped protrusion 41 moving in a circular motion in the second special-shaped hole 22 and failing. It has high stability, improving service life and reliability.

[0042] In one embodiment, the annular wear-resistant part 5 is formed on the V-shaped edge of the expansion sleeve 2, the wear-resistant groove 6 is a V-shaped groove, or the annular wear-resistant part 5 is a W-shaped edge, and the wear-resistant groove 6 is a W-shaped groove. The edge cross-section of the annular wear-resistant part 5 is V-shaped, and the two included angles of the V-shaped edge are, for example, 40 degrees, or it is a W-shaped edge. When the V-shaped groove and the V-shaped edge are combined, it can reduce the loss during friction, reduce the replacement times and replacement costs. The cooperation between the W-shaped edge and the W-shaped groove can provide a stable contact area for cooperation, avoiding damage caused by excessive uniform friction stress during frictional braking.

[0043] In one embodiment, a connection groove 13 and a spring 9 are further provided on the expansion sleeve 2. One end of the spring 9 is connected within the connection groove 13, and adjacent expansion sleeves 2 can be connected by the spring 9. The connection groove 13 is formed between adjacent expansion sleeves 2, enabling both ends of the spring 9 to straddle and elastically connect two adjacent expansion sleeves 2. When the driving shaft drives rotation, the inward stress received by the expansion sleeve 2 is greater than the pulling force provided by the spring 9, so that multiple expansion sleeves 2 can move cooperatively during inward and outward expansion, avoiding jamming of a certain expansion sleeve 2 that may cause a malfunction and failing to achieve the function of one-way power isolation.

[0044] In one embodiment, the connection grooves 13 on two adjacent expansion sleeves 2 communicate with each other and are used for elastic connection with the same spring 9.

[0045] In one embodiment, a first keyway 10 is provided on the driving disc 1, and a second keyway 12 is formed on the inner side of the driven shaft sleeve 4 for connecting the driven shaft. The driving disc 1 and the driven shaft sleeve 4 are connected to the rotating shaft through the first keyway and the second keyway 12.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principles and purposes of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A friction type two-way backstop, characterized in that, Comprising: A driving disc, which is used to connect to a driving shaft, and a first special-shaped hole is formed inside the driving disc; A plurality of expansion sleeves, which are arranged in a ring combination. On one side corresponding to the driving disc, a first special-shaped protrusion is formed to cooperate with the first special-shaped hole. The first special-shaped protrusion is inserted into the first special-shaped hole, and a second special-shaped hole is formed on the inner side of the end far from the first special-shaped protrusion, and a wear-resistant part in the shape of a ring is formed on the outer side; A fitting part, and a wear-resistant groove for cooperating with the wear-resistant part is formed on the inner side of the ring of the fitting part; A driven shaft sleeve, and a second special-shaped protrusion is formed on the outer side of the driven shaft sleeve. The second special-shaped protrusion is inserted into the second special-shaped hole. When the driving disc is actively driven, the driving disc squeezes the first special-shaped protrusion through the first special-shaped hole, causing the plurality of expansion sleeves to contract inward and separating the wear-resistant part and the wear-resistant groove, and driving the rotation by clamping the second special-shaped protrusion through the expansion sleeves; When the driving disc stops driving, the second special-shaped protrusion squeezes the second special-shaped hole, causing the plurality of expansion sleeves to expand outward and docking the wear-resistant part and the wear-resistant groove to prevent the driven shaft sleeve from rotating.

2. The frictional two-way backstop according to claim 1, wherein The cross-sectional shapes of the first special-shaped protrusion and the first special-shaped hole are the same, the cross-sectional shapes of the second special-shaped protrusion and the second special-shaped hole are the same, the cross-sectional area of the first special-shaped protrusion is larger than the cross-sectional area of the second special-shaped protrusion, and the cross-sectional area of the first special-shaped hole is larger than the cross-sectional area of the second special-shaped hole.

3. The friction type two-way backstop according to claim 2, wherein, The number of the expansion sleeves is 3, and the cross-section of each expansion sleeve is in the shape of a sector with a 120-degree opening angle.

4. The friction type two-way backstop according to claim 3, characterized in that, The cross-sectional shapes of the first special-shaped protrusion and the first special-shaped hole are both triangles with outward convex rounded corners.

5. The friction type bi-directional backstop according to claim 4, characterized in that, A protruding part is formed on the inner side of the expansion sleeve corresponding to the second special-shaped hole. The protruding part is used to abut against the second special-shaped protrusion. The protruding part extends towards the inner side of the second special-shaped hole, and a concave part is formed in the middle section of the protruding part.

6. The frictional two-way backstop according to claim 1, characterized in that, The annular wear-resistant part is formed on the V-shaped edge of the expansion sleeve, and the wear-resistant groove is a V-shaped groove, or the annular wear-resistant part is a W-shaped edge, and the wear-resistant groove is a W-shaped groove.

7. The friction type bi-directional backstop according to claim 1, wherein A connecting groove and a spring are further arranged on the expansion sleeve. One end of the spring is connected in the connecting groove, and adjacent expansion sleeves can be connected through the spring.

8. The frictional two-way backstop according to claim 7, characterized in that, The connecting grooves on two adjacent expansion sleeves are communicated for elastic connection by the same spring.

9. The friction type two-way backstop according to claim 1, wherein A first key hole is arranged on the driving disc, and a second key hole is formed on the inner side of the driven shaft sleeve for connecting to a driven shaft.

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