Adjustable damping mechanism and mechanical joint with damping adjustment function

Abstract

The present application relates to a kind of adjustable damping mechanism and the mechanical joint with damping adjustment function, the mechanism is used to connect at least two movable parts of relative rotation, including: rotating part, with the inner ring and outer ring of relative rotation, and its outer ring is connected with the first movable part;First friction part, with the inner ring of rotating part and second movable part is connected;Second friction part, axially movable, circumferentially not rotatably arranged on the first movable part, and form friction interface between first friction part;Adjusting part, connected with second friction part, for driving second friction part close to or away from first friction part, to make the friction damping of the friction interface between two friction parts increase or decrease;The mechanical joint includes at least two movable parts connected by the adjustable damping mechanism described above.The present application can make that under the requirement of guaranteeing high rotation accuracy, with smaller volume of space, the output of large damping is realized, while the stability of damping in long time use and the adjustable and easy adjustability of damping size can be guaranteed.

Description

Technical Field

[0001] This invention relates to a mechanical device, specifically to an adjustable damping mechanism and a mechanical joint with damping adjustment function. Background Technology

[0002] As is well known, mechanical joints are the most commonly used mechanical parts in mechanical equipment, especially motion mechanisms. Different applications place different demands on the performance of mechanical joints. Often, some mechanical joints require a certain degree of damping, especially those that need to achieve arbitrary stopping.

[0003] However, the damping mechanisms in mechanical joints that can be stopped and started on the market often have the following problems: ① low motion accuracy; ② non-adjustable damping; ③ excessively large structure when providing large damping; ④ damping changes significantly with the increase of usage time. Summary of the Invention

[0004] To address the aforementioned problems, one objective of this invention is to provide an adjustable damping mechanism that enables high damping output with a small volume of space while ensuring high rotational accuracy, and simultaneously guarantees the stability of the damping during long-term use and the adjustability and ease of adjustment of the damping magnitude. Another objective of this invention is to provide a mechanical joint with damping adjustment function, wherein the mechanical joint incorporates the aforementioned adjustable damping mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an adjustable damping mechanism for connecting at least two relatively rotatable movable parts, the mechanism comprising: a rotating part having a relatively rotatable inner ring and an outer ring, wherein the outer ring of the rotating part is connected to a first movable part; a first friction part connected to the inner ring of the rotating part and a second movable part; a second friction part axially movable but circumferentially non-rotatable disposed on the first movable part, wherein a friction interface is formed between the second friction part and the first friction part; and an adjusting part connected to the second friction part for driving the second friction part to move closer to or away from the first friction part along the axis of the adjustable damping mechanism, thereby increasing or decreasing the friction damping of the friction interface between the second friction part and the first friction part.

[0006] Preferably, in the adjustable damping mechanism, the rotation axis of the rotating part is perpendicular to the length direction of both the first movable part and the second movable part.

[0007] Preferably, the adjustable damping mechanism includes: a guide member that can rotate in or out along the axial direction of the damping mechanism; and an elastic member, one end of which abuts against the guide member and the other end of which abuts against the first friction part.

[0008] The adjustable damping mechanism preferably further includes a retainer connected to the outer ring of the first movable part and the rotating part, and a gap is left between the retainer and the rotating part, with the first friction part and the second friction part located in the gap between the retainer and the rotating part.

[0009] Preferably, in the adjustable damping mechanism, the elastic element is a compression spring.

[0010] Preferably, in the adjustable damping mechanism, the guide member includes a guide rod and a screw head integrally formed at one end of the guide rod. The outer circumference of the screw head has an external thread, and the inner ring of the retainer has an internal thread that mates with the external thread of the screw head. The screw head is threadedly connected to the retainer. A spring positioning sleeve is formed between the guide rod and the screw head. A compression spring is sleeved on the guide rod, with one end of the compression spring located inside the spring positioning sleeve and the other end of the compression spring abutting against the first friction part.

[0011] Preferably, in the adjustable damping mechanism, the rotating part is a crossed roller bearing.

[0012] Preferably, in the adjustable damping mechanism, the inner ring of the crossed roller bearing is simultaneously connected to the first friction part and the second movable part via a first connecting member, and the outer ring of the crossed roller bearing is simultaneously connected to the movable part and the cage via a second connecting member.

[0013] Preferably, in the adjustable damping mechanism, the outer periphery of the second friction part is formed with a plurality of protruding teeth, and the first movable part is formed with a guide groove that matches the outer contour of the second friction part. The second friction part is fitted in the guide groove so that the guide groove can restrict the circumferential movement of the second friction part but not restrict the movement of the second friction part along the axis of the adjustable damping mechanism.

[0014] Preferably, the adjustable damping mechanism has a trapezoidal contact area formed at the contact interface between the first friction part and the second friction part.

[0015] Preferably, the adjustable damping mechanism is made of wear-resistant phosphor bronze, with both the first friction part and the second friction part made of wear-resistant phosphor bronze.

[0016] A mechanical joint with damping adjustment function includes at least two movable parts that can rotate relative to each other, the at least two movable parts being pivotally connected together by the aforementioned adjustable damping mechanism.

[0017] The present invention, by adopting the above technical solutions, has the following advantages: 1. The adjustable damping mechanism of the present invention, due to the use of crossed roller bearings, effectively guarantees the motion accuracy and performance of the mechanism. 2. The adjustable damping mechanism of the present invention allows for convenient adjustment of the frictional damping between the inner and outer friction rings by adjusting the compression amount of the compression spring. 3. The compression spring of the present invention can be a die spring, thereby providing a large axial force and achieving a large damping output in a small volume. 4. The adjustable damping mechanism of the present invention uses a compression spring to press the inner and outer friction rings together. Under a large compression amount, the wear of the inner and outer friction rings has a very small impact on the axial force and can be ignored, thus maintaining a basically constant frictional damping magnitude. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a mechanical joint according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of this embodiment of the invention;

[0020] Figure 3 This is a schematic diagram of the adjustable damping mechanism in this embodiment of the present invention;

[0021] Figure 4 This is an exploded view of the adjustable damping mechanism of this embodiment of the present invention;

[0022] Figure 5 (a) and (b) are schematic diagrams of the structure of a guide screw according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the assembly of the connecting rod and the outer friction ring according to an embodiment of the present invention. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0025] like Figures 1 to 3As shown, the adjustable damping mechanism 1 provided in this embodiment includes: a crossed roller bearing 11, the outer ring of which is fixedly connected to the connecting rod 2 by bolts and nuts; an inner friction ring 12 (which can also be a friction block or friction plate), which is fixedly connected to the inner ring of the crossed roller bearing 11 and the connecting rod 3 by bolts 17 and nuts 18, and the rotation axis of the crossed roller bearing 11 is perpendicular to the length direction of the connecting rod 2 and the connecting rod 3; an outer friction ring 13, which is axially movable but circumferentially non-rotatable on the connecting rod 2, and a contact interface is formed between the outer friction ring 13 and the inner friction ring 12; and an adjustment part 10, which is connected to the outer friction ring 13 and is used to drive the outer friction ring 13 to move closer to or further away from the inner friction ring 12 along the axis of the adjustable damping mechanism 1, so as to increase or decrease the friction damping of the contact interface between the outer friction ring 13 and the inner friction ring 12.

[0026] In the above embodiment, preferably, such as Figures 2 to 4 As shown, the adjustable damping mechanism 1 also includes a cage 14 that is fixedly connected to the connecting rod 2 and the outer ring of the crossed roller bearing 11 by bolts 19 and nuts 20, and there is a gap between the cage 14 and the crossed roller bearing 11. The inner ring friction ring 12 and the outer ring friction ring 12 are located in the gap between the cage 14 and the crossed roller bearing 11.

[0027] In the above embodiment, preferably, such as Figure 4 and Figure 5As shown in (a) and (b), the adjusting part 10 includes a compression spring 15 and a guide screw 16. The guide screw 16 is mainly composed of a guide rod 21 and a screw head 22 integrally formed at one end of the guide rod 21. The outer circumference of the screw head 22 has an external thread, and the inner ring of the retainer 14 has an internal thread that matches the external thread of the screw head 22. The screw head 22 is threadedly connected in the retainer 14. A spring positioning sleeve 23 is formed between the guide rod 21 and the screw head 22. The compression spring 15 is sleeved on the guide rod 21. One end of the compression spring 15 is located in the spring positioning sleeve 23, and the other end of the compression spring 15 abuts against the inner ring friction ring 12. Therefore, when the guide screw 16 is rotated inward along the axis of the damping mechanism 1 by rotating the wrench groove 24 on the end face of the screw head 22, the compression of the compression spring 15 will increase, thereby generating greater frictional damping between the outer ring friction ring 13 and the inner ring friction ring 12, thus limiting the relative rotation between the inner and outer rings of the crossed roller bearing 11, and further limiting the relative rotation of the connecting rods 2 and 3 connected to the inner and outer rings of the crossed roller bearing 11 respectively. Conversely, when the guide screw 16 is rotated outward along the axis of the damping mechanism 1 by rotating the wrench groove 24 on the end face of the screw head 22, the compression of the compression spring 15 will decrease, thereby reducing the frictional damping between the outer ring friction ring 13 and the inner ring friction ring 12, thus promoting the relative rotation between the inner and outer rings of the crossed roller bearing 11, and further promoting the relative rotation of the connecting rods 2 and 3 connected to the inner and outer rings of the crossed roller bearing 11 respectively.

[0028] In the above embodiments, preferably, as follows: Figure 4 , Figure 6 As shown, the outer ring friction ring 13 has several protruding teeth on its outer periphery, and the connecting rod 2 has a guide groove that matches the outer contour of the outer ring friction ring 13. The outer ring friction ring 13 fits in the guide groove so that the guide groove can restrict the circumferential movement of the outer ring friction ring 13 but not restrict the movement of the outer ring friction ring 13 along the axis of the adjustable damping mechanism 1.

[0029] In the above embodiments, preferably, a trapezoidal contact area is formed on the contact surface of the inner friction ring 12 and the outer friction ring 13, thereby increasing the friction between the two under the same axial force.

[0030] In the above embodiments, preferably, both the inner friction ring 12 and the outer friction ring 13 are made of wear-resistant phosphor bronze.

[0031] Based on the adjustable damping mechanism provided in the above embodiments, the present invention also provides a mechanical joint with damping adjustment function. For example... Figure 1 , Figure 2As shown, the mechanical joint mainly consists of an adjustable damping mechanism 1, a connecting rod 2, and a connecting rod 3. The connecting rod 2 is fixed to the outer ring of the crossed roller bearing 11 by bolts and nuts, and the connecting rod 3 is fixed to the inner ring of the crossed roller bearing 11 by bolts 17 and nuts 18.

[0032] The above embodiments are only used to illustrate the present invention. The structure, connection method and manufacturing process of each component can be varied. All equivalent transformations and improvements made on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. An adjustable damping mechanism for connecting at least two relatively rotatable movable parts (2,3), characterized in that, This organization includes: The rotating part (11) has an inner ring and an outer ring that can rotate relative to each other, and the outer ring of the rotating part (11) is connected to the first movable part (2); The first friction part (12) is connected to the inner ring of the rotating part (11) and the second movable part (3); The second friction part (13) is axially movable but circumferentially non-rotatable on the first movable part (2), and a friction interface is formed between the second friction part (13) and the first friction part (12); An adjustment unit, connected to the second friction part (13), is used to drive the second friction part (13) closer to or further away from the first friction part (12), so as to increase or decrease the frictional damping of the friction interface between the second friction part (13) and the first friction part (12); and The retainer (14) is simultaneously connected to the outer ring of the first movable part (2) and the rotating part (11); The rotating part (11) is a crossed roller bearing. The inner ring of the crossed roller bearing is connected to the first friction part (12) and the second movable part (3) through the first connecting member. The outer ring of the crossed roller bearing is connected to the movable part (2) and the cage (14) through the second connecting member.

2. The adjustable damping mechanism according to claim 1, characterized in that, The rotation axis of the rotating part (11) is perpendicular to the length direction of both the first movable part (2) and the second movable part (3).

3. The adjustable damping mechanism according to claim 1 or 2, characterized in that, The adjustment unit includes: The guide (16) can be rotated in or out along the axis of the adjustable damping mechanism; An elastic element (15) has one end abutting against the guide (16) and the other end abutting against the first friction part (12).

4. The adjustable damping mechanism according to claim 1 or 2, characterized in that, A gap is left between the retainer (14) and the rotating part (11), and the first friction part (12) and the second friction part (13) are located in the gap between the retainer (14) and the rotating part (11).

5. The adjustable damping mechanism according to claim 3, characterized in that, The elastic element (15) is a compression spring.

6. The adjustable damping mechanism according to claim 5, characterized in that, The guide member (16) includes a guide rod and a screw head integrally formed at one end of the guide rod. The outer periphery of the screw head has an external thread, and the inner ring of the retainer (14) has an internal thread that matches the external thread of the screw head. The screw head is threadedly connected to the retainer (14). A spring positioning sleeve is formed between the guide rod and the screw head. The compression spring is sleeved on the guide rod. One end of the compression spring is located inside the spring positioning sleeve, and the other end of the compression spring abuts against the first friction part (12).

7. The adjustable damping mechanism according to any one of claims 1, 2, 5 or 6, characterized in that, The outer periphery of the second friction part (13) is formed with a plurality of protruding teeth, and the first movable part (2) is formed with a guide groove that matches the outer contour of the second friction part (13). The second friction part (13) is fitted in the guide groove so that the guide groove can restrict the circumferential movement of the second friction part (13) but not restrict the movement of the second friction part (13) along the axis of the adjustable damping mechanism.

8. The adjustable damping mechanism according to any one of claims 1, 2, 5 or 6, characterized in that, A trapezoidal contact area is formed on the contact interface between the first friction part (12) and the second friction part (13).

9. The adjustable damping mechanism according to any one of claims 1, 2, 5 or 6, characterized in that, Both the first friction part (12) and the second friction part (13) are made of wear-resistant phosphor bronze.

10. A mechanical joint with damping adjustment function, comprising at least two movable parts (2,3) that can rotate relative to each other, characterized in that, The at least two movable parts (2,3) are pivotally connected together by an adjustable damping mechanism as described in any one of claims 1 to 9.

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