TW202018213A - Revolving positioning mechanism of rotation shaft characterized in the first passive member and the second passive member being subjected to opposite action forces thereby enabling the gear to be clamped so as to be prevented from shaking - Google Patents

Abstract

A revolving positioning mechanism of a rotation shaft includes a first passive member and a second passive member adjacently arranged and capable of relatively displacing, and the first passive member and the second passive member respectively have tooth rows which are staggeringly arranged and simultaneously engaged with a gear. When the first passive member and the second passive member are subjected to opposite action forces, the gear is able to be clamped so as to be prevented from shaking. When the gear is a portion of the rotation shaft and one end of the rotation shaft is combined with an object, the object can perform a rotating operation; when the object is rotated to a positioning point for being prevented from shaking, the object can be kept in a precise positioning status.

Description

Rotary positioning mechanism of rotating shaft

The invention relates to a transmission mechanism; in particular, it refers to a gear transmission mechanism that can produce a rotation positioning effect on a rotating shaft.

Transmission mechanism refers to those who can change the motion mode, direction or speed provided by the power. Commonly, the friction force between the machine parts is used to transmit power, or the meshing method is used to transmit power to drive the movement or operation of the machine parts. . Taking the meshing transmission mechanism as an example, it is through the mutual engagement between the convex teeth to exert the effect of reliable transmission motion and large applicable load, so it is widely used in machine tools.

Figures 1 to 3 show a known gear transmission mechanism, which drives the rack 2 (Racks) to reciprocate to drive the gear 2 meshing with it to produce positive and negative rotation. Changing to the rotation mode, when the gear 2 is a part of the rotating shaft 3, the object coupled to the end of the rotating shaft 3 can be driven to rotate correspondingly. Take the tool changer arm 4 of the machine tool as an example, that is, it is combined with one end of the rotating shaft 3 and rotates accordingly to perform the tool change operation. However, when the tool change arm 4 is stopped, due to the convex teeth 1a of the rack 1 and the gear The convex tooth 2a of 2 has a tooth gap G between the meshing parts, so that the rotating shaft 3 still has a slight slewing space. This situation causes the tool changer arm 4 to be unable to be accurately positioned at the non-swaying stop position and increases the trouble, similar The situation is not limited to the case where the object is a tool changer arm. For example, when the object is a rotary table, it will be difficult to maintain excellent stability in the state of stopping motion due to the presence of backlash.

In view of this, the object of the present invention is to provide a rotary positioning mechanism for a rotating shaft, which can produce excellent and precise positioning of 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 rotary shaft, the rotary shaft has a gear, and the rotary positioning mechanism includes a first follower with a first tooth row and a second follower with a second tooth row, Among them, the first follower and the second follower are arranged adjacent to each other, and the gear meshes with the first tooth row and the second tooth row at the same time; when the first follower receives the force in the first direction, the second follower receives When the second direction force acts, and the direction of the first direction force and the second direction force are opposite, the first tooth row and the second tooth row push the pinion gear.

The effect of the present invention is that when the first follower and the second follower can move relatively and receive the opposite force, they can pinch the gear so as not to shake.

In order to explain the present invention more clearly, the preferred embodiments are described in detail below with reference to the drawings. Please refer to the rotary positioning mechanism 100 shown in FIG. 4 to FIG. 6, which can be used to drive 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 rotate with an animal piece According to different application occasions, the object may be a tool-changing arm of a machine tool or another object that needs to be rotated and can be accurately positioned when the rotation is stopped.

The rotation positioning mechanism 100 includes a first follower 10 and a second follower 20 that are disposed adjacent to each other and can move relatively, and the first follower 10 has a first tooth row 12 and the second follower 20 has a first The two-tooth row 22 and the gear 201 of the rotating shaft 200 simultaneously mesh with the first-tooth row 12 and the second-tooth row 22. In this embodiment, the gear 201 is a spur gear (Spur gears) having a plurality of meshing teeth 201a arranged along the circumference, and the first follower 10 and the second follower 20 are independent racks (Racks). ), and configured with parallel shafts (Parallel shafts) between each other. When the rotary positioning mechanism 100 stops moving and the rotating shaft 200 stops rotating, the first follower 10 receives the first directional force F1, the second follower 20 receives the second directional force F2, and the first directional force F1 and The direction of the second direction force F2 is opposite, so that the first tooth row 12 and the second tooth row 22 are arranged in a misaligned manner and the backlash is eliminated accordingly, so that the clamping gear 201 can be pushed to keep the rotating shaft 200 in a stable state without shaking Relatively, the objects combined at one end of the rotating shaft 200 can be accurately positioned. The aforementioned first directional force F1 and second directional force F2 may be one of which is an acting force and the other is a reaction force. It is not excluded that it may be caused by different pressure sources.

7 to FIG. 10, in addition to the above-mentioned first follower 10 and second follower 20, the rotary positioning mechanism 100 in an embodiment further includes a rotary seat 30 and a cylinder 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. Among them, the rotary seat 30 is centered and has a shaft hole 32 for the outer sleeve. The rotary shaft 200 with the bearing 202 and the sealing ring 203 rotatably penetrated therein, and one end of the rotary shaft 200 passes through the rotary seat 30 and can be combined with objects ( For example, the tool change arm), the opposite sides of the rotary seat 30 are respectively connected with a cylindrical cylinder tube 40, and the two cylinder tubes 40 are respectively connected with the first pressure cylinder 50 and the second pressure cylinder 60, and each cylinder A first thrust member 70 and a second thrust member 80 movable in the axial direction are respectively disposed in the tube 40, and the control module 90 controls the first pressurizing cylinder 50 to generate a first direction force F1 to act on the first thrust member 70, or the second pressurizing cylinder 60 is controlled to generate a second direction force F2 to act on the second pushing member 80. The aforementioned first directional force F1 and second directional force F2 may be caused by oil pressure or air pressure. The control module 90 may include a solenoid valve for switching the flow direction of hydraulic oil or gas. 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 releasing pressure.

The first follower 10 and the second follower 20 of this embodiment are racks of the same length, wherein the first tooth row 12 of the first follower 10 is composed of a plurality of first The convex teeth 14 are formed, and each of the first convex teeth 14 has a first front tooth surface 14a and a first rear tooth surface 14b opposite to each other, and forms a first tooth valley 16 between adjacent first convex teeth 14; the second The second tooth row 22 of the follower 20 is composed of a plurality of second convex teeth 24 arranged along the axial direction, and each second convex tooth 24 has a second front tooth surface 24a and a second rear tooth opposite to each other On the surface 24b, a second tooth valley 26 is formed between adjacent second convex teeth 24. 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 both ends of the second follower 20, the first row of teeth 12 and the second row of teeth 22 are misaligned, but the difference in misalignment can still be a meshing tooth into the corresponding first tooth valley 16 and The second tooth valley 26.

The first follower 10 and the second follower 20 pass through the through hole 34 of the rotary seat 30, and both ends extend into the cylinder tube 40 and are arranged orthogonally to the rotating shaft 200. The first follower The member 10 and the second driven member 20 are located between the first thrust member 70 and the second thrust member 80 belonging to a piston structure, wherein the first thrust member 70 has a first thrust surface 72 that abuts the first At one end of the follower 10, the second pushing member 80 has an end at which the second pushing surface 82 abuts the second follower 20. In the rotary positioning mechanism 100 disclosed in FIGS. 9 and 10, the first pressurizing cylinder 50 generates a first direction force F1 to act on the first thrust member 70, and the first thrust member 70 pushes the first driven member to the right 10, the second pushing member 80 stops at the inner side wall of the second pressurizing cylinder 60 due to the pressure release state of the second pressurizing cylinder 60, so that the second follower 20 receives the reaction force (ie, the second direction force) F2), please cooperate with FIG. 11 to FIG. 13 again, when the control module 90 stops the control action so that the first follower 10 and the second follower 20 also stop moving, the first protruding teeth 14 are based on The first front tooth surface 14a and the second rear tooth surface 24b of the second convex tooth 24 abut front and back on the opposite side tooth surfaces of the corresponding meshing tooth 201a located on the first radial line L1. There is no backlash between 201a and the first protruding teeth 14 and the second protruding teeth 24. At this point, the rotating shaft 200 stops rotating and remains in a stable state without shaking. At the same time, due to the misaligned design of the first tooth row 12 and the second tooth row 22, the other end of the first follower 10 and the second abutment surface 82 maintain a gap G1, and the second follower The other end of the member 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 changed to control the second pressurizing cylinder 60 to generate the second direction force F2 to act on the second pusher 80, and the first pressurizing cylinder 50 is turned into the pressure releasing state As shown in Fig. 14, the first direction force F1 in this procedure will not exist, and the second direction force F2 will no longer be a reaction force, so the second pusher 80 will push the second follower to the left 20 moves so that its second convex tooth 24 pushes the meshing tooth 201a in a linear direction, as shown in FIG. 15, at this time, the meshing tooth 201a on the first radial line L1 is deflected to the second radial line In the process of L2, the first follower 10 is synchronously pushed to move in the same translation direction as the second follower 20, because 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 the moving stroke of the first follower 10 is slightly larger than that of the second follower 20, as shown in FIGS. 16A and 16B, this situation causes the first follower 10 (the second follower 20) does not contact the second abutting surface 82 (the first abutting surface 72) and the gap G2 between the second abutting surface 82 (the first abutting surface 72) is slightly larger than the above The gap G1 in the state disclosed in FIG. 13 also causes the first convex tooth 14 to move closer to the position where the second convex tooth 24 coincides, so that there is a backlash between the meshing tooth 201a of the gear 201 and the convex tooth, which is beneficial to 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 pressurizing cylinder 50, the control module 90 will stop the control action. At this time, the second pushing member 80 still bears the oil pressure in the cylinder tube 40 Or the air pressure is affected by the force F2 in the second direction, and the first thrust member 70 is reacted by the reaction force (ie, the force F1 in the first direction) because it stops at the inner side wall of the first pressurizing cylinder 50. The situation makes the distance between the end of the follower and the abutting surface of the pushing member again reduced to the gap G1, and will thus again cause the first convex tooth 14 to have the first front tooth surface 14a and the second convex tooth 24 The second rear tooth surface 24b abuts the tooth surfaces of the opposite sides of the corresponding meshing tooth forward and backward, which means that the rotation control of the rotating shaft 200 is completed, and the rotating shaft 200 stops rotating and remains in a stable state without shaking.

As can be seen from the above, the present invention synchronizes the rotation of the transmission gear 201 through the first follower 10 and the second follower 20 which are arranged adjacent to each other and can move relatively, and when one of them is resisted and cannot advance, The gear teeth 201a of the gear 201 are pinched by the influence of the pairing force of the working force and the reaction force to prevent loosening. In other words, when the object combined at one end of the rotating shaft 200 is a tool changer arm, the tool changer arm can be kept in a state of precise positioning without rotating slightly when the rotation reaches the positioning point.

Please refer to FIG. 17 again. In the above embodiment, at least one positioning ring 18 can be optionally sleeved on the outside of the first follower 10 and the second follower 20 to stabilize the relative position between each other. Two positioning rings are sleeved on both ends of the follower. In addition, a biasing member 36 can be added to the rotary seat 30 to provide a biasing force to 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 fits the outer contours of the first follower 10 and the second follower 20, and the biasing force can be generated by a spring or a bolt with an adjustable position. The aforementioned bolt is screwed into a screw hole of the rotary seat 30.

The method for driving the rotating shaft to rotate in the above embodiment is achieved by a rack with straightly arranged tooth rows. However, in other embodiments, it may be an internal gear (Internal gears) and a spur gear (Spur gears) Combination, that is, the gear of the rotating shaft is still a spur gear, and the first follower and the second follower are respectively arranged adjacent to each other and have the same rotation center as the spur gear and can rotate relatively. The tooth rows are ring-shaped and are still misaligned with each other, which can achieve the same as the above embodiment to drive the rotating shaft to rotate, and produce a limiting effect on the rotating shaft without swaying in a stopped state.

The above is only the preferred and feasible embodiments of the present invention, and any equivalent changes in applying the description of the present invention and the scope of patent application should be included in the patent scope of the present invention.

[Invention] 100: Rotary positioning mechanism 10: First follower 12: First tooth row 14: First convex tooth 14a: First front tooth surface 14b: First rear tooth surface 16: First tooth valley 18: Locating ring 20: Second follower 22: Second tooth row 24: Second convex tooth 24a: Second front tooth surface 24b: Second rear tooth surface 26: Second tooth valley 30: Swivel seat 32: Shaft hole 34 : Through hole 36: Biasing piece 36a: Contact surface 40: Cylinder tube 50: First pressurizing cylinder 60: Second pressurizing cylinder 70: First pushing member 72: First pushing surface 80: Second pushing Item 82: Second abutment surface 90: Control module 200: Rotating shaft 201: Gear 201a: Meshing tooth 202: Bearing 203: Sealing ring G1, G2: Clearance F1: First direction force F2: Second direction force L1 : First radial line L2: Second radial line

Fig. 1 is a top 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" in Fig. 2; Fig. 4 is a rotary positioning mechanism and a preferred embodiment of the present invention A perspective view of the configuration of the rotating shaft; FIG. 5 is a top view of FIG. 4; FIG. 6 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 of another preferred embodiment of the present invention; Fig. 7 is a combined perspective view of the components in Fig. 7; Fig. 9 is a sectional view in the direction 9-9 of Fig. 8; Fig. 10 is a partial cross-section and top view of Fig. 8; Fig. 11 is a partial enlarged view of Fig. 9; Figure 13 is a partial enlarged view of Figure 10; Figure 14 is similar to Figure 10, revealing the state of rotation of the rotating shaft; Figure 15 is similar to Figure 11, revealing the state of rotation corresponding to the rotating shaft in Figure 14; Figures 16A and 16B 14 are partial enlarged views of the "B" part and the "C" part in FIG. 14; FIG. 17 is a perspective view showing that the rotary positioning mechanism includes a positioning ring and a biasing member.

100: rotary positioning mechanism

10: First follower

12: first dentition

20: second follower

22: second dentition

200: axis of rotation

201: gear

201a: meshing teeth

Claims (9)

A rotary positioning mechanism for a rotary shaft, the rotary shaft having a gear, the rotary positioning mechanism includes: a first follower with a first tooth row; a second follower, which is adjacent to the first slave The moving member has a second row of teeth; wherein the gear of the rotating shaft meshes with the first row of teeth and the second row of teeth at the same time; thereby, a first directional force acts on the first driven member When the second follower receives a second direction force and the first direction force is opposite to the second direction force, the first tooth row and the second tooth row push the gear. The rotary positioning mechanism of the rotary shaft according to claim 1, wherein one of the first direction force and the second direction force is an acting force, and the other is a reaction force. The rotary positioning mechanism of the rotating shaft according to claim 2 includes a first pushing member and a second pushing member, the first pushing member has a first pushing surface, and the second pushing member has a A second abutting surface, the first follower and the second follower are disposed between the first pusher and the second pusher, wherein one end of the first follower abuts the first The abutting surface, the other end maintains a gap with the second abutting surface, one 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 includes a first pressurizing cylinder and a second pressurizing cylinder, wherein the first pressurizing cylinder generates the first direction force when acting on the first follower , The second pushing member generates a reaction force to the second driven member; the second pressure cylinder generates the second directional force to act on the second driven member, and the first pushing member to the first driven member The moving parts produce a reaction force. According to claim 4, the rotary positioning mechanism of the rotary shaft includes a control module that controls one of the first pressurizing cylinder and the second pressurizing cylinder to generate a directional force, and the other is Pressure relief state. The rotary positioning mechanism of the rotary shaft according to any one of claims 2-5, wherein the gear of the rotary shaft has a plurality of meshing teeth arranged along the circumference, and the first tooth row of the first follower has A plurality of first protruding teeth arranged in an axial direction and a first tooth valley is formed between adjacent first protruding teeth. The second tooth row of the second follower has a plurality of first protruding teeth arranged in the axial direction A second tooth valley is formed between the two convex teeth and the adjacent second convex tooth; wherein the meshing tooth is located in the corresponding first tooth valley and second tooth valley, and the first tooth valley and the second tooth valley It is set in a dislocation. The rotary positioning mechanism of the rotary shaft according to claim 6, wherein each first convex tooth has a first front tooth surface and a first rear tooth surface opposite to each other, and each second convex tooth has opposite A second front tooth surface and a second rear tooth surface; wherein the first front tooth surface of the first convex tooth and the second rear tooth surface of the second convex tooth respectively abut on opposite sides of the corresponding meshing tooth The surface, or the first rear tooth surface of the first convex tooth and the second front tooth surface of the second convex tooth, respectively abut against the tooth surfaces on opposite sides of the corresponding meshing tooth. The rotary positioning mechanism of the rotary shaft according to claim 6, wherein at least one positioning ring is sleeved on the outside of the first follower and the second follower. The rotary positioning mechanism of the rotary shaft according to claim 6, includes a biasing member for providing a biasing force to the first driven member and the second driven member to make the first tooth row and the second tooth The row engages the gear.

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