TWM573396U - Rotary positioning mechanism of rotation shaft - Google Patents

Abstract

A rotary positioning mechanism for a rotating shaft includes a first driven member and a second driven member which are disposed adjacent to each other and are relatively movable. The first driven member and the second driven member have a misaligned design of the tooth row and simultaneously mesh with the gear When the first follower and the second follower are subjected to the opposite force, the gear can be pinched so as not to shake. When the gear is part of the rotating shaft and one end of the rotating shaft is combined with the object, the object can rotate and maintain the precise positioning state without shaking when the rotation reaches the positioning point.

Description

Rotary axis rotary positioning mechanism

This creation is related to the transmission mechanism; in particular, it is a gear transmission mechanism that can produce a rotary positioning effect on a rotating shaft.

The transmission mechanism refers to the one that can change the movement mode, direction or speed of the power supply. It is common to use the friction between the parts to transmit power, or to use the meshing method to transmit power to drive the movement or operation of the machine parts. . Taking the meshing transmission mechanism as an example, it is effective in the transmission movement and the application load is large through the mutual engagement of the convex teeth, and thus is widely used in the machine tool.

1 to 3 show a known gear transmission mechanism which generates a forward and reverse rotation by a gear 2 which drives a rack R1 to reciprocately move, and the aforementioned arrangement is a linear motion. Changing to the rotation mode, when the gear 2 is a part of the rotary shaft 3, the object coupled to one end of the rotary shaft 3 can be driven to generate a corresponding rotation. Taking the tool change arm 4 of the machine tool as an example, that is, it is combined with one end of the rotary shaft 3 to rotate with it to perform the tool change operation. However, when the tool change arm 4 is in the stopped state, the convex tooth 1a and the gear of the rack 1 are used. The convex tooth 2a of the 2 has a backlash G between the meshing portions, so that the rotating shaft 3 still has a slight turning space, which causes the tool changing arm 4 to be accurately positioned in the non-swaying stop position, which is aggravating, similar The case is not limited to the case where the object is a tool change arm, and other things such as the rotary table will also be difficult to maintain excellent stability in the state of stopping the movement due to the presence of the backlash.

In view of this, the purpose of the present invention is to provide a rotary positioning mechanism for a rotating shaft, which can accurately position the rotating shaft when the mechanism stops moving.

In order to achieve the above object, the present invention provides a rotary positioning mechanism for a rotating shaft, the rotating shaft has a gear, and the rotary positioning mechanism includes a first follower having a first tooth row and a second follower having a second tooth row, Wherein the first follower and the second follower are disposed adjacent to each other, and the gear is simultaneously meshed with the first tooth row and the second tooth row; when the first follower is subjected to the first direction force, the second follower is subjected to When the second direction force acts, and the first direction force is opposite to the direction of the second direction force, the first tooth row and the second tooth row push the gear.

The effect of the present invention is that the first follower and the second follower can be relatively moved and subjected to an opposing force to pinch the gear so as not to shake.

In order to explain the present invention more clearly, the preferred embodiment will be described in detail with reference to the drawings. Please refer to the rotary positioning mechanism 100 shown in FIG. 4 to FIG. 6 for driving the rotating shaft 200. The rotating shaft 200 has a gear 201, and one end of the rotating shaft 200 can be combined with an object (not shown) and rotated by an animal. The object may be a tool change arm of the machine tool or other object that has to be rotated and can be accurately positioned when the rotation is stopped, depending on the application.

The rotary positioning mechanism 100 includes a first follower 10 and a second follower 20 that are disposed adjacent to each other and are relatively movable, and the first follower 10 has a first tooth row 12 and the second follower 20 has a first The second tooth row 22, the gear 201 of the rotating shaft 200 simultaneously meshes with the first tooth row 12 and the second tooth row 22. In the present embodiment, the gear 201 is a spur gear having a plurality of circumferentially disposed meshing teeth 201a, and the first follower 10 and the second follower 20 are independent racks (Racks, respectively). ) and arranged in parallel with each other in Parallel shafts. When the rotary positioning mechanism 100 stops moving and the rotating shaft 200 stops rotating, the first follower 10 is subjected to the first direction force F1, the second follower 20 is acted by the second direction force F2, and the first direction force F1 is The direction of the second direction force F2 is opposite, so that the first tooth row 12 and the second tooth row 22 are dislocated and accordingly the backlash is eliminated, so that the gear 201 can be pushed to keep the rotating shaft 200 in a stable state without shaking. The object that is coupled to one end of the rotating shaft 200 can be accurately positioned. The first direction force F1 and the second direction force F2 may be one of the forces and the other is a reaction force, which may be caused by different pressure sources.

As shown in FIG. 7 to FIG. 10, the rotary positioning mechanism 100 in an embodiment further includes a rotary seat 30 and a cylinder in addition to the first follower 10 and the second follower 20 described above. The tube 40, the first pressing cylinder 50, the second pressing cylinder 60, the first pushing member 70, the second pushing member 80, and the control module 90. Wherein, the rotary seat 30 is centrally located and has a shaft hole 32 for the outer sleeve 40 and the seal ring 203 of the rotary shaft 200 is rotatably inserted therein, one end of the rotary shaft 200 and the rotary seat 30 can be coupled to the object ( For example, the tool changing arm), the opposite sides of the rotating base 30 are respectively connected with a cylindrical cylinder tube 40, and the two cylinder tubes 40 are respectively connected to the first pressing cylinder 50 and the second pressing cylinder 60, respectively, and each cylinder A first pushing member 70 and a second pushing member 80 are respectively disposed in the tube 40, and the control module 90 controls the first pressing cylinder 50 to generate a first direction force F1 to act on the first pushing member. 70, or controlling the second pressing cylinder 60 to generate a second direction force F2 acting on the second pushing member 80. The generation of the first direction force F1 and the second direction force F2 may be caused by oil pressure or air pressure, and the control module 90 may include a solenoid valve for switching the flow direction of the hydraulic oil or the gas, which is easy to say. When one of the first pressurizing cylinder 50 and the second pressurizing cylinder 60 generates a directional force, the other is in a state of being released.

The first follower 10 and the second follower 20 of the embodiment are racks of the same length, wherein the first row 12 of the first follower 10 is arranged by a plurality of first ones arranged along the axial direction. The convex teeth 14 are configured, and each of the first protruding teeth 14 has a first front tooth surface 14a and a first rear tooth surface 14b opposite to each other, and a first tooth valley 16 is formed between the adjacent first convex teeth 14; The second tooth row 22 of the follower 20 is composed of a plurality of second protruding teeth 24 arranged in the axial direction, and each of the second protruding teeth 24 has a second front tooth surface 24a and a second rear tooth opposite to each other. A second valley 26 is formed between the adjacent second protruding teeth 24 in the face 24b. The pitch of the first tooth row 12 is the same as the pitch of the second tooth row 22, but the first tooth row 12 and the second tooth row 22 are not in a completely aligned position, that is, when the first follower 10 When aligned with the two ends of the second follower 20, the first tooth row 12 and the second tooth row 22 are misaligned, but the offset difference can still be a meshing tooth entering the corresponding first tooth valley 16 and In the second valley 26 .

The first follower 10 and the second follower 20 are disposed adjacent to the through hole 34 of the swing base 30, and both ends thereof extend into the cylinder tube 40 to be orthogonally arranged with the rotating shaft 200, and the first driven The first pushing member 70 and the second pushing member 20 are located between the first pushing member 70 and the second pushing member 80 belonging to a piston structure, wherein the first pushing member 70 has the first abutting surface 72 abutting the first At one end of the follower 10, the second pushing member 80 has a second abutting surface 82 that abuts against one end of the second follower 20. In the rotary positioning mechanism 100 disclosed in FIG. 9 and FIG. 10, the first pressing cylinder 50 generates a first direction force F1 acting on the first pushing member 70, and the first pushing member 70 pushes the first driven member to the right. The second pushing member 80 terminates in the inner side wall of the second pressing cylinder 60 due to the release state of the second pressing cylinder 60, so that the second follower 20 is subjected to the reaction force (ie, the second direction force) F2), please cooperate with FIG. 11 to FIG. 13 , when the control module 90 stops the control action and the first follower 10 and the second follower 20 also stop moving, the first convex tooth 14 is The first front tooth surface 14a and the second rear tooth surface 24b of the second convex tooth 24 abut against the opposite tooth flanks of the corresponding meshing teeth 201a on the first radial line L1, and the meshing teeth at this time There is no backlash between the first protruding tooth 14 and the second protruding tooth 24, and the rotating shaft 200 stops rotating and remains in a stable state without shaking, and the object is coupled to the end of the rotating shaft 200. Obtaining precise positioning, at the same time, because of the misalignment design of the first tooth row 12 and the second tooth row 22, the other end of the first follower 10 and the second abutting surface 82 are protected. Holding the gap G1, the other end of the second follower 20 maintains the same gap G1 as the first abutment surface 72.

When the rotating shaft 200 is driven to rotate, the control module 90 is controlled to control the second pressing cylinder 60 to generate the second direction force F2 to act on the second pushing member 80, and the first pressing cylinder 50 is turned into the pressure releasing state. As shown in FIG. 14, the first direction force F1 will not exist in this program, and the second direction force F2 will no longer be a reaction force, so the second pushing member 80 will push the second follower to the left. 20 moves, causing its second convex teeth 24 to push the meshing teeth 201a in a linear direction, as shown in Fig. 15, at which time the meshing teeth 201a in situ on the first radial line L1 are deflected to the second radial line. During the process of L2, the first follower 10 will be synchronously pushed to move in the same translation direction as the second follower 20, since the second follower 20 pushes the gear 201 in a linear direction, and the gear 201 is rotated. The first follower 10 is pushed, so that the moving stroke of the first follower 10 is slightly larger than the moving stroke of the second follower 20, as shown in FIGS. 16A and 16B, the situation results in the first follower 10 (second follower 20) does not contact one end of the second abutment surface 82 (first abutment surface 72) and the second abutment surface 82 (first abutment surface 72) The gap G2 is slightly larger than the gap G1 of the state disclosed in FIG. 13 described above, and also causes the first convex teeth 14 to be close to the position where the second protruding teeth 24 are overlapped, so that the meshing teeth 201a of the gear 201 are generated between the teeth and the convex teeth. There is a backlash, so that the first follower 10 and the second follower 20 can smoothly mesh with the transmission rotating shaft 200 for rotation.

When the first pushing member 70 moves to the inner side wall of the first pressing cylinder 50, the control module 90 will stop the control action, and the second pushing member 80 at this time still bears the oil pressure in the cylinder tube 40. Or the air pressure is subjected to the second direction force F2, and the first pushing member 70 is subjected to a reaction force (ie, the first direction force F1) due to the inner side wall of the first pressing cylinder 50. The situation is such that the distance between the end of the follower and the abutment surface of the thrust member is again reduced to the gap G1, and thus the first convex tooth 14 is again caused by the first front tooth surface 14a and the second convex tooth 24 The two rear tooth faces 24b abut against the opposite side tooth faces of the corresponding meshing teeth, and thus the rotation control of the rotating shaft 200 is completed, and the rotating shaft 200 stops rotating and is maintained in a stable state without shaking.

It can be seen from the above that the first follower 10 and the second follower 20, which are disposed adjacent to each other and are relatively movable, synchronously engage the transmission gear 201 to rotate, and even when one of them is resisted and cannot advance, The meshing teeth 201a of the gear 201 are pinched to prevent loosening due to the influence of the pairing force of the writing force and the reaction force, respectively. It is claimed that when the object combined at one end of the rotating shaft 200 is a tool changing arm, the tool changing arm can maintain a precise positioning state without a slight shaking when the rotation reaches the positioning point.

Referring to FIG. 17 again, at least one positioning ring 18 can be selectively disposed on the outside of the first follower 10 and the second follower 20 in the above embodiment for stabilizing the relative positions of each other. Two positioning rings are sleeved on both ends of the follower. In addition, a biasing member 36 can be added to the rotating base 30 for providing a biasing force between the first follower 10 and the second follower 20 to maintain a good meshing relationship between the gear and the tooth row. The biasing member 36 has a contact surface 36a that cooperates with the contour of the first follower 10 and the second follower 20, and the biasing force can be generated by a spring or a bolt having an adjustable position. The aforementioned bolt is screwed into a screw hole of the swivel seat 30.

The manner for driving the rotating shaft to rotate in the above embodiment is achieved by a rack having a straight row of teeth, but in other embodiments, it may be an internal gear and a spur gear. The combination, that is, the gear of the rotating shaft is still a spur gear, and the first follower and the second follower are respectively disposed adjacent to each other and have the same rotation center and relative rotation with the spur gear, the internal gear The dentitions are annular and are still misaligned with each other, which can achieve the same embodiment to drive the rotation of the rotating shaft, and in the stopped state, the rotating shaft has a limiting effect without shaking.

The above is only a preferred embodiment of the present invention, and equivalent changes to the scope of the present application and the scope of the patent application are intended to be included in the scope of the present patent.

[This creation]

100‧‧‧Rotary positioning mechanism

10‧‧‧First follower

12‧‧‧First dentition

14‧‧‧First convex tooth

14a‧‧‧First front tooth surface

14b‧‧‧First rear tooth surface

16‧‧‧First tooth valley

18‧‧‧ positioning ring

20‧‧‧Second follower

22‧‧‧second dentition

24‧‧‧second convex teeth

24a‧‧‧Second front tooth surface

24b‧‧‧second rear tooth surface

26‧‧‧Second Valley

30‧‧‧Revolving seat

32‧‧‧Axis hole

34‧‧‧through holes

36‧‧‧ biasing parts

36a‧‧‧Contact surface

40‧‧‧Cylinder tube

50‧‧‧First pressurized cylinder

60‧‧‧Second pressure cylinder

70‧‧‧First pusher

72‧‧‧First top match

80‧‧‧Second pusher

82‧‧‧ second top face

90‧‧‧Control Module

200‧‧‧Rotary axis

201‧‧‧ Gears

201a‧‧‧Meshing teeth

202‧‧‧ bearing

203‧‧‧Seal ring

G1, G2‧‧‧ gap

F1‧‧‧First direction force

F2‧‧‧second direction force

L1‧‧‧first radial line

L2‧‧‧second radial line

1 is a plan view of a known gear transmission mechanism; FIG. 2 is a front view of FIG. 1; FIG. 3 is a partial enlarged view of a portion "A" of FIG. FIG. 5 is a front view and a partial view of FIG. 5; FIG. 7 is an exploded view of the rotary positioning mechanism and the rotating shaft according to another preferred embodiment of the present invention; Figure 9 is a cross-sectional view taken along line 9-9 of Figure 8; Figure 10 is a partial cross-sectional view of Figure 8; Figure 11 is a partial enlarged view of Figure 9; Figure 12 is a partial cross-sectional view of Figure 11 Figure 13 is a partial enlarged view of Figure 10; Figure 14 is similar to Figure 10, showing the state of rotation of the rotating shaft; Figure 15 is similar to Figure 11, showing the state of rotation of the rotating shaft corresponding to Figure 14; Figure 16A and Figure 16B 1 is a partial enlarged view of a portion "B" and a portion "C" in FIG. 14; and FIG. 17 is a perspective view showing the rotary positioning mechanism including a positioning ring and a biasing member.

Claims (9)

A rotary positioning mechanism for a rotary shaft, the rotary shaft having a gear, the rotary positioning mechanism comprising: a first follower having a first tooth row; a second follower being adjacent to the first slave The movable member has a second tooth row; wherein the gear of the rotating shaft simultaneously meshes with the first tooth row and the second tooth row; thereby, the first follower is subjected to a first direction force When the second follower is subjected to a second direction force, and the first direction force is opposite to the direction of the second direction force, the first tooth row and the second tooth row push the gear. The rotary positioning mechanism of the rotating shaft according to claim 1, wherein one of the first direction force and the second direction force is a force, and the other is a reaction force. The rotary positioning mechanism of the rotating shaft according to claim 2, comprising a first pushing member and a second pushing member, the first pushing member having a first abutting surface, the second pushing member having a a second abutting surface, the first follower and the second follower are disposed between the first pushing member and the second pushing member, wherein the first driven member abuts the first end The other end of the abutting surface maintains a gap with the second abutting surface, the second end of the second follower abuts the second abutting surface, and the other end maintains a gap with the first abutting surface. The rotary positioning mechanism of the rotary shaft according to claim 3, comprising a first pressurizing cylinder and a second pressurizing cylinder, wherein the first pressurizing cylinder generates the first direction force acting on the first follower member The second pushing member generates a reaction force to the second driven member; the second pressing cylinder generates the second direction force acting on the second driven member, and the first pushing member acts on the first slave member The moving parts generate a reaction force. The rotary positioning mechanism of the rotating shaft according to claim 4, comprising a control module, wherein the control module controls one of the first pressurized cylinder and the second pressurized cylinder to generate a directional force, and the other is Pressure release status. The rotary positioning mechanism of the rotary shaft according to any one of claims 2 to 5, wherein the gear of the rotary shaft has a plurality of meshing teeth disposed along a circumference, and the first tooth row of the first follower has a a plurality of first protruding teeth arranged in the axial direction and a first tooth valley formed between the adjacent first convex teeth, and the second tooth row of the second driven member has a plurality of first rows arranged along the axial direction Forming a second valley between the two convex teeth and adjacent second protruding teeth; wherein the meshing teeth are located in the corresponding first valley and the second valley, and the first valley and the second valley The system is in a misplaced setting. The rotary positioning mechanism of the rotating shaft according to claim 6, wherein each of the first protruding teeth has a first front tooth surface and a first rear tooth surface opposite to each other, and each of the second protruding teeth has a opposite pair a second front tooth surface and a second rear tooth surface; wherein the first front tooth surface of the first protruding tooth and the second rear tooth surface of the second protruding tooth respectively abut opposite teeth of the corresponding meshing teeth The surface, or the first rear tooth surface of the first protruding tooth and the second front tooth surface of the second protruding tooth respectively abut the opposite side tooth faces of the corresponding meshing teeth. The rotary positioning mechanism of the rotating shaft according to claim 6, wherein the first follower and the outer portion of the second follower are sleeved with at least one positioning ring. The rotary positioning mechanism of the rotating shaft according to claim 6, comprising a biasing member for providing a biasing force to the first follower and the second follower, the first tooth row and the second tooth The column engages the gear.