Hooke joint structure capable of switching postures

Abstract

The utility model relates to the technical field of multi-degree-of-freedom platforms, in particular to a hooke joint structure capable of switching postures, which comprises a base, a pair of mounting plates perpendicular to the base are connected onto the base, and shaft holes are formed in the mounting plates; the supporting shaft piece is connected into the shaft hole of the mounting plate, the axis of the supporting shaft piece and the axis of the shaft hole are in the first direction, and the first direction is perpendicular to the normal of the base. According to the utility model, a plurality of positioning holes are formed in the mounting plates, the bearing part is mounted between the mounting plates, the bearing part can be fixed between the mounting plates in different angle postures by penetrating the positioning pins through the positioning holes at different positions, so that the bearing part is positioned at a horizontal, inclined or vertical position, and the positioning pins can ensure the stability of the structure; the hook joint can be switched into a vertical hook joint, a horizontal hook joint or a hook joint inclined by 45 degrees, so that different requirements can be met under the condition of unified batch production.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-degree-of-freedom platforms, in particular to a Hooke's hinge structure with switchable postures. Background Art

[0002] Hooke's hinge is mainly used to bear large torque and weight, and can provide large rotational freedom in a specific direction. It can not only transmit motion and torque, but also play a role of connection and support in mechanical systems. Hooke's hinge is widely used in various occasions that require high precision and large torque transmission, such as robot arms, molds, doors, etc. In parallel robots, Hooke's hinge is often used to replace traditional planar hinges to achieve multi-dimensional freedom of movement.

[0003] In a parallel robot, horizontal Hooke's joint and vertical Hooke's joint may be used as needed, or a 45° inclined block may be installed to prevent the Hooke's joint and the platform from interfering. Currently, traditional Hooke's joints generally have only two major types: horizontal Hooke's joint and vertical Hooke's joint. Due to their different types, it is difficult to achieve structural uniformity for the two types of Hooke's joints, and it is difficult to achieve mass production in production.

[0004] Therefore, there is an urgent need for a Hooke's joint with multiple postures for application on a multi-degree-of-freedom platform. Utility Model Content

[0005] In view of the technical problems existing in the prior art of the Hooke's hinge, the first aspect of the utility model proposes a Hooke's hinge structure with switchable postures, comprising:

[0006] A base, the base is connected with a pair of mounting plates perpendicular to the base, and the mounting plates are provided with shaft holes;

[0007] A supporting shaft member connected to the shaft hole of the mounting plate, wherein the axes of the supporting shaft member and the shaft hole are along a first direction, and the first direction is perpendicular to the normal line of the base;

[0008] A bearing component connected to the support shaft, the bearing component can rotate relative to the support shaft along a first direction, the bearing component includes a bearing chamber and a Hooke's hinge center shaft, the Hooke's hinge center shaft rotates relative to the bearing chamber along a second direction, and the second direction is perpendicular to the first direction;

[0009] A positioning pin connected to the mounting plate, the bearing chamber being provided with a pin hole, the positioning pin being insertable into the pin hole so that the bearing component and the base are at a predetermined angle;

[0010] Wherein, the mounting plate is provided with a plurality of positioning holes, and the positioning pins can be inserted into the positioning holes to relatively fix the bearing component and the mounting plate.

[0011] Preferably, the mounting plate is provided with 2 to 5 positioning holes, and when the positioning pins are inserted into different positioning holes, the bearing component and the mounting plate are at different angles.

[0012] Preferably, the bearing component is provided with two pin holes respectively located on both sides of the supporting shaft, and a pair of positioning pins is provided on a mounting plate, and the pair of positioning pins are respectively inserted into the two pin holes of the bearing component.

[0013] Preferably, the mounting plate is provided with eight positioning holes distributed in a circular array, and an angle of 45° is formed between every two adjacent positioning holes.

[0014] Preferably, the Hooke's hinge center shaft and the bearing chamber are connected via two bearings.

[0015] Preferably, the bearing chamber is constructed to be open at both ends, the Hooke's hinge shaft is inserted into the bearing chamber, and two bearings are respectively at the first end and the second end of the bearing chamber, the bearing at the first end of the bearing chamber is positioned by the shoulder of the Hooke's hinge shaft, and the bearing at the second end of the bearing chamber is positioned by the end cover at the rear end of the Hooke's hinge shaft.

[0016] Preferably, the supporting shaft includes a fixing pin, a first oil-free bearing and a second oil-free bearing, the first oil-free bearing and the second oil-free bearing are sleeved on the shaft surface of the fixing pin, the first oil-free bearing is connected to the inner wall of the shaft hole, the outer wall of the bearing chamber is provided with a shaft hole, and the second oil-free bearing is connected to the shaft hole.

[0017] Preferably, the mounting plate is provided with a screw hole, the fixing nail is provided with a screw, and the screw is installed in the screw hole to fix the fixing nail to the mounting plate.

[0018] Compared with the prior art, the advantages of the utility model are:

[0019] The utility model provides a plurality of positioning holes on the mounting plate, and the bearing component is installed between the mounting plates. The bearing component can be fixed between the mounting plates at different angles by positioning pins passing through the positioning holes at different positions, so that the bearing component is in a horizontal, inclined or vertical position. The positioning pins can ensure the stability of the structure, and the structure can be switched to a vertical, horizontal or 45° inclined Hooke's hinge. Therefore, under the condition of unified batch production, different needs can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:

[0021] Figure 1 It is a schematic diagram of the bearing component and the base shown in the utility model, which form an angle of 45°;

[0022] Figure 2 It is a side view of the bearing component shown in the utility model, with the bearing component and the base forming an angle of 45°;

[0023] Figure 3 It is a schematic diagram of the bearing component and the base shown in the utility model, which form an angle of 0°;

[0024] Figure 4 This is a schematic diagram of a cross-sectional structure in which the bearing component and the base are at an angle of 0° shown in the utility model;

[0025] Figure 5 It is a structural schematic diagram of the base shown in the utility model. DETAILED DESCRIPTION

[0026] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the first aspect of the utility model proposes a switchable Hook hinge structure, including a base 10, a support shaft 20, a bearing component 40 and a positioning pin 30. Optionally, the base 10 is a disc-shaped connecting flange with a plurality of screw holes on the surface. A pair of mounting plates 11 perpendicular to the base 10 are connected to the base 10, such as Figure 5 As shown, an axial hole 111 is provided on the mounting plate 11 , and a space for mounting the bearing component 40 is formed between a pair of mounting plates 11 .

[0028] like Figure 2 As shown, the support shaft 20 is connected to the shaft hole 111 of the mounting plate 11, and the axis of the support shaft 20 and the shaft hole 111 is along a first direction, which is perpendicular to the normal of the base 10. The bearing component 40 is connected to the support shaft 20, and the bearing component 40 can rotate relative to the support shaft 20 along the first direction.

[0029] In this way, the angle of the bearing component 40 can be changed as needed to keep the bearing component 40 and the base 10 horizontal, vertical or at other angles. When the bearing component 40 and the base 10 are horizontal, a horizontal Hooke's hinge is formed, and when the bearing component 40 and the base 10 are vertical, a vertical Hooke's hinge is formed.

[0030] Furthermore, the bearing component 40 includes a bearing chamber 41 and a Hooke's hinge center shaft 42. The Hooke's hinge center shaft 42 rotates relative to the bearing chamber 41 along a second direction, and the second direction is perpendicular to the first direction.

[0031] The Hooke's hinge center shaft 42 is connected to the driving cylinder, and the base 10 is connected to the motion platform. Through the free rotation of the Hooke's hinge center shaft 42 and the bearing chamber 41, the motion platform of the multi-degree-of-freedom platform can be in a posture with a large angle of inclination.

[0032] Furthermore, in order to fix the bearing component 40 to a predetermined posture, the positioning pin 30 is connected to the mounting plate 11 , and a pin hole is provided on the bearing chamber 41 , and the positioning pin 30 can be inserted into the pin hole, so that the bearing component 40 and the base 10 are at a predetermined angle.

[0033] The mounting plate 11 is provided with a plurality of positioning holes 112 , into which the positioning pins 30 can be inserted, so that the bearing component 40 and the mounting plate 11 are relatively fixed.

[0034] Each time the positioning pin 30 passes through one of the positioning holes 112 to fix the bearing component 40 , the bearing component 40 is placed at a different angle.

[0035] In this way, when the bearing component 40 is at a preset angle, the positioning pin 30 passes through the mounting plate 11 and is inserted into the pin hole on the bearing chamber 41, so that the mounting plate 11 and the bearing chamber 41 are fixed in the radial direction of the positioning pin 30, that is, the bearing chamber 41 can no longer rotate relative to the mounting plate 11 after being at this angular position.

[0036] In an optional embodiment, 2 to 5 positioning holes 112 are provided on the mounting plate 11 . When the positioning pins 30 are inserted into different positioning holes 112 , the bearing component 40 and the mounting plate 11 are at different angles.

[0037] like Figure 2 As shown, when the positioning pin 30 is inserted into the positioning hole 112 in the horizontal position, the bearing component 40 and the mounting plate 11 are in the horizontal position, as shown in FIG. Figure 3 As shown, when the locating pin 30 is inserted into the locating hole 112 at an inclined 45° position, the bearing component 40 and the mounting plate 11 form an angle of 45°. It can be understood that when the locating pin 30 is inserted into the locating hole 112 at a vertical position, the bearing component 40 and the mounting plate 11 are perpendicular.

[0038] Preferably, the bearing component 40 is provided with two pin holes respectively located on both sides of the supporting shaft 20 , and a pair of positioning pins 30 are provided on a mounting plate 11 , and the pair of positioning pins 30 are respectively inserted into the two pin holes of the bearing component 40 .

[0039] In this way, four positioning pins 30 are used on the mounting plates 11 on both sides to position the bearing component 40, thereby ensuring that the bearing component 40 has a strong load-bearing capacity at this position.

[0040] In an optional embodiment, if Figure 5As shown, the mounting plate 11 is provided with eight positioning holes 112 distributed in a circular array, and an angle of 45° is formed between every two adjacent positioning holes 112 .

[0041] Therefore, the positioning requirements of the two positioning pins 30 at different angles can be met.

[0042] like Figure 4 As shown, the Hooke's hinge center shaft 42 and the bearing chamber 41 are connected via two bearings 43 .

[0043] Furthermore, the bearing chamber 41 is constructed to be open at both ends, the Hooke's hinge shaft 42 is inserted into the bearing chamber 41, and the two bearings 43 are respectively at the first end and the second end of the bearing chamber 41. The bearing 43 at the first end of the bearing chamber 41 is positioned by the shoulder of the Hooke's hinge shaft 42, and the bearing 43 at the second end of the bearing chamber 41 is positioned by the end cover 421 at the rear end of the Hooke's hinge shaft 42.

[0044] Specifically, the middle position of the bearing chamber 41 has an inwardly protruding step, and one end of the Hook's hinge center shaft 42 is provided with a shoulder. During assembly, bearings 43 are respectively installed at both ends of the bearing chamber 41, and the Hook's hinge center shaft 42 is inserted into the bearing chamber 41, and then the end cover 421 is installed at the other end of the Hook's hinge center shaft 42. The shoulder and the end cover 421 respectively position the two bearings 43, and then the rear end of the bearing chamber 41 is sealed using the rear cover 44 and the fixing screws 441.

[0045] like Figure 3 and Figure 4 As shown, the supporting shaft 20 includes a fixing nail 21, a first oil-free bearing 23 and a second oil-free bearing 24. The first oil-free bearing 23 and the second oil-free bearing 24 are sleeved on the shaft surface of the fixing nail 21, the first oil-free bearing 23 is connected to the inner wall of the shaft hole 111, the outer wall of the bearing chamber 41 is provided with a shaft hole, and the second oil-free bearing 24 is connected to the shaft hole.

[0046] The first oil-free bearing 23 may be a flanged oil-free bearing, and the second oil-free bearing 24 may be a straight oil-free bearing. The bearing chamber 41 can rotate relative to the mounting plate 11 through the first oil-free bearing 23 and the second oil-free bearing 24 .

[0047] Specifically, the mounting plate 11 is provided with a screw hole 113, and the fixing nail 21 is provided with a screw 22, and the screw 22 is installed in the screw hole 113 to fix the fixing nail 21 to the mounting plate 11. The cross section of the fixing nail 21 is T-shaped.

[0048] In this way, after the fixing nail 21 is installed on the mounting plate 11 , it can block the positioning pin 30 in the positioning hole 112 to prevent the positioning pin 30 from falling off.

[0049] In combination with the above embodiments, the utility model provides a plurality of positioning holes on the mounting plate, and the bearing component is installed between the mounting plates. The bearing component can be fixed between the mounting plates at different angles by positioning pins passing through the positioning holes at different positions, so that the bearing component is in a horizontal, inclined or vertical position. The positioning pins can ensure the stability of the structure, and the structure can be switched to a vertical, horizontal or 45° inclined Hooke's hinge. Therefore, under the condition of unified mass production, different needs can be met.

[0050] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A Hooke's hinge structure with switchable posture, characterized in that: include: A base (10), wherein a pair of mounting plates (11) perpendicular to the base (10) are connected to the base (10), and an axial hole (111) is provided on the mounting plate (11); A support shaft (20) connected to the shaft hole (111) of the mounting plate (11), wherein the axes of the support shaft (20) and the shaft hole (111) are along a first direction, wherein the first direction is perpendicular to the normal of the base (10); A bearing component (40) connected to the support shaft (20), the bearing component (40) being rotatable relative to the support shaft (20) along a first direction, the bearing component (40) comprising a bearing chamber (41) and a Hooke's hinge center shaft (42), the Hooke's hinge center shaft (42) being rotatable relative to the bearing chamber (41) along a second direction, the second direction being perpendicular to the first direction; A positioning pin (30) is connected to the mounting plate (11), and a pin hole is provided on the bearing chamber (41). The positioning pin (30) can be inserted into the pin hole, so that the bearing component (40) and the base (10) form a predetermined angle. The mounting plate (11) is provided with a plurality of positioning holes (112), and the positioning pins (30) can be inserted into the positioning holes (112), so that the bearing component (40) and the mounting plate (11) are relatively fixed.

2. The switchable Hooke's hinge structure according to claim 1, characterized in that: The mounting plate (11) is provided with 2 to 5 positioning holes (112). When the positioning pin (30) is inserted into different positioning holes (112), the bearing component (40) and the mounting plate (11) are at different angles.

3. The switchable Hooke's hinge structure according to claim 1, characterized in that: The bearing component (40) is provided with two pin holes respectively located on both sides of the supporting shaft (20); a pair of positioning pins (30) is provided on a mounting plate (11); and the pair of positioning pins (30) are respectively inserted into the two pin holes of the bearing component (40).

4. The switchable Hooke's hinge structure according to claim 3, characterized in that: The mounting plate (11) is provided with eight positioning holes (112) distributed in a circular array, and an angle of 45° is formed between every two adjacent positioning holes (112).

5. The switchable Hooke's hinge structure according to claim 1, characterized in that: The Hooke's hinge center shaft (42) and the bearing chamber (41) are connected via two bearings (43).

6. The switchable Hooke's hinge structure according to claim 5, characterized in that: The bearing chamber (41) is constructed to be open at both ends. The Hooke's hinge center shaft (42) is inserted into the bearing chamber (41). Two bearings (43) are respectively located at the first end and the second end of the bearing chamber (41). The bearing (43) at the first end of the bearing chamber (41) is positioned by the shaft shoulder of the Hooke's hinge center shaft (42), and the bearing (43) at the second end of the bearing chamber (41) is positioned by the end cover (421) at the rear end of the Hooke's hinge center shaft (42).

7. The switchable posture Hooke's hinge structure according to claim 1, characterized in that: The supporting shaft (20) comprises a fixing nail (21), a first oil-free bearing (23) and a second oil-free bearing (24); the first oil-free bearing (23) and the second oil-free bearing (24) are sleeved on the shaft surface of the fixing nail (21); the first oil-free bearing (23) is connected to the inner wall of the shaft hole (111); the outer wall of the bearing chamber (41) is provided with a shaft hole; the second oil-free bearing (24) is connected to the shaft hole.

8. The switchable posture Hooke's hinge structure according to claim 7, characterized in that: The mounting plate (11) is provided with a screw hole (113), the fixing nail (21) is provided with a screw (22), and the screw (22) is installed in the screw hole (113) so that the fixing nail (21) is fixed to the mounting plate (11).

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