Gear mechanism and pan / tilt

Abstract

The present invention provides a gear engaging mechanism and a pan-tilt head, comprising a gear disc, a central shaft, a stop shaft, a stop seat and a base; the gear disc is rotatably arranged on the central shaft; the stop seat is fixed on the stop shaft, the stop shaft is arranged on the base, and the stop seat can prevent the stop shaft from rotating; a plurality of tooth grooves are provided on the gear disc, and the stop seat can abut the side walls of the tooth grooves; the stop shaft can move axially along the stop shaft relative to the base to allow the stop seat to be inserted into or withdrawn from the tooth grooves; at all abutment positions of the side walls of the tooth grooves and the stop seat: the angle between the pressure direction of the side walls of the tooth grooves on the stop seat and the movement direction of the abutment position of the side walls of the tooth grooves with the stop seat is in the range of 0°-20°. The gear engaging mechanism and pan-tilt head provided by the present invention reduce the friction between the tooth grooves and the stop seat by reducing the pressure direction of the side walls of the tooth grooves on the stop seat and the movement direction of the abutment position of the side walls of the tooth grooves with the stop seat, thereby facilitating the withdrawal of the stop seat from the tooth groove.

Description

Technical Field

[0001] The present invention belongs to the technical field of camera equipment, and more particularly, relates to a gear mechanism and a pan / tilt head. Background Art

[0002] The pan-tilt head is widely used in cameras, DV cameras and other products, and the gear mechanism is the core structure of the pan-tilt head. Its quality directly affects the performance of the pan-tilt head, thereby affecting the user's camera experience.

[0003] The gear shifting mechanism includes a sprocket and a stopping mechanism. A hook is provided on the stopping mechanism, which is inserted into the tooth groove of the sprocket to prevent the sprocket from rotating, thereby generating damping. However, at the contact position between the hook and the sprocket, the angle between the direction of the force exerted by the sprocket on the hook and the movement direction of this position is large, resulting in a large friction between the sprocket and the hook, making it difficult for the hook to detach from the sprocket, affecting the use of the gear shifting mechanism. Summary of the Invention

[0004] The purpose of the present invention is to provide a gear engaging mechanism and a pan / tilt head to solve the technical problem in the prior art that the gear disc and the stop mechanism are not easy to separate.

[0005] To achieve the above object, the technical solution adopted by the present invention is: providing a gear engaging mechanism, comprising a gear plate, a center shaft, a stop shaft, a stop seat and a base;

[0006] The toothed disc is rotatably mounted on the central shaft;

[0007] The stop seat is fixed on the stop shaft, the base is provided with a limiting hole, the stop shaft is arranged in the limiting hole, and the limiting hole can prevent the stop shaft from rotating;

[0008] The toothed disc is provided with a plurality of tooth grooves in the circumference thereof, and the stop seat can abut against the side walls of the tooth grooves to prevent the toothed disc from rotating forward or reversely;

[0009] The stop shaft can move relative to the base along the axial direction of the stop shaft so that the stop seat is inserted into or withdrawn from the tooth groove;

[0010] At all contact positions of the side wall of the tooth groove and the stop seat: the angle between the pressure direction of the side wall of the tooth groove on the stop seat and the movement direction of the contact position of the side wall of the tooth groove and the stop seat is in the range of 0°-20°.

[0011] Furthermore, the pressure direction of the side wall of the tooth groove on the stop seat passes through the axis of the stop shaft.

[0012] Furthermore, the stop seat includes a first protrusion and a second protrusion respectively configured to extend into the tooth groove;

[0013] When the first protrusion abuts against a side wall of one of the tooth grooves, the second protrusion abuts against a side wall of the other tooth groove.

[0014] Furthermore, the first protrusion abuts against a side wall of one of the tooth grooves in the forward rotation direction of the gear disc, and the second protrusion abuts against a side wall of the other tooth groove in the reverse rotation direction of the gear disc.

[0015] Furthermore, the width of the first protrusion and the width of the second protrusion are both smaller than the groove width of the tooth groove.

[0016] Furthermore, a first stop surface is provided on both opposite side walls of the tooth groove, a second stop surface abutting against the first stop surface is provided on the outer wall of the first protrusion, and a third stop surface abutting against the first stop surface is provided on the outer wall of the second protrusion.

[0017] Furthermore, the first stop surface is connected to the outer circumferential surface of the gear disc.

[0018] Furthermore, the two first stop surfaces of the same tooth groove are both arranged at an angle and approach each other in the direction in which the stop seat is inserted into the tooth groove.

[0019] Furthermore, the two first stop surfaces of the same tooth groove are inclined toward the opening direction of the tooth groove and gradually move away from each other.

[0020] The present invention further provides a pan / tilt platform, comprising a plurality of damping plates and the gear shifting mechanism described in any one of the above technical solutions, wherein the damping plates are fixed on the central axis and abut against the gear disc;

[0021] When the stop seat is inserted into the tooth groove, the damping plate and the toothed disc rotate relative to each other;

[0022] When the stop seat exits the tooth groove, the damping plate rotates synchronously with the toothed disc.

[0023] The beneficial effects of the gear mechanism and pan-tilt platform provided by the present invention are as follows: compared with the prior art, the stop shaft of the gear mechanism of the present invention moves along its axial direction relative to the base, so that the stop seat fixed on the stop shaft is inserted into the tooth groove or exits the tooth groove, and the base can prevent the stop shaft from rotating. Therefore, the stop seat can control whether the gear disc rotates, and by controlling whether the gear disc rotates, the presence or absence of pan-tilt platform damping is realized; when the stop seat is inserted into the tooth groove, the stop seat can abut against the side wall of the tooth groove to prevent the gear disc from rotating forward or reverse, ensuring that the stop seat can completely limit the gear disc Rotation to avoid the sprocket from making slight rotations and affecting the performance of the gimbal; at all abutment positions of the side wall of the tooth groove and the stop seat: the angle between the pressure direction of the side wall of the tooth groove on the stop seat and the movement direction of the abutment position of the side wall of the tooth groove and the stop seat is in the range of 0°-20°. Compared with the technical solution with an angle greater than 20°, the pressure of the side wall of the tooth groove on the stop seat is smaller, so the friction between the side wall of the tooth groove and the stop seat is smaller, and the stop seat is easy to withdraw from the tooth groove, thereby facilitating the separation of the stop seat from the sprocket and improving the performance of the gimbal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic structural diagram of a gear shifting mechanism provided in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 for Figure 2 Force analysis diagram of the second bulge in the figure;

[0028] Figure 4 for Figure 1 A cross-sectional view of the intermediate gear mechanism;

[0029] Figure 5 for Figure 1 Schematic diagram of the partial structure of the middle gear mechanism.

[0030] Among them, the reference numerals in the figures are:

[0031] 1. Toothed disc; 11. Tooth groove; 111. First stop surface; 2. Stop shaft; 3. Stop seat; 31. First protrusion; 311. Second stop surface; 32. Second protrusion; 321. Third stop surface; 4. Base; 41. Limit hole. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0036] See also Figures 1 to 4 The gear engaging mechanism provided by the present invention is now described. The gear engaging mechanism includes a gear plate 1, a central shaft (not shown in the figure), a stop shaft 2, a stop seat 3 and a base 4;

[0037] The toothed disc 1 is rotatably mounted on the central shaft;

[0038] The stop seat 3 is fixed on the stop shaft 2. The base 4 is provided with a limiting hole 41. The stop shaft 2 is arranged in the limiting hole 41. The limiting hole 41 can prevent the stop shaft 2 from rotating.

[0039] The sprocket 1 is provided with a plurality of tooth grooves 11 along its circumference, and the stopper 3 can abut against the sidewalls of the tooth grooves 11 to prevent the sprocket 1 from rotating forward or reverse.

[0040] The stop shaft 2 can move relative to the base 4 along the axial direction of the stop shaft 2 so that the stop seat 3 is inserted into or withdrawn from the tooth groove 11;

[0041] All contact positions of the side wall of the tooth groove 11 and the stop seat 3: the angle between the pressure direction of the side wall of the tooth groove 11 on the stop seat 3 and the movement direction of the contact position of the side wall of the tooth groove 11 and the stop seat 3 ranges from 0° to 20°.

[0042] The gear engaging mechanism provided by the present invention is compared with the prior art. The stop shaft 2 moves along its axial direction relative to the base 4, so that the stop seat 3 fixed on the stop shaft 2 is inserted into the tooth groove 11 or exits the tooth groove 11, and the base 4 can prevent the stop shaft 2 from rotating. Therefore, the stop seat 3 can control whether the gear disc 1 rotates. By controlling whether the gear disc 1 rotates, the presence or absence of pan / tilt damping is realized; when the stop seat 3 is inserted into the tooth groove 11, the stop seat 3 can abut against the side wall of the tooth groove 11 to prevent the gear disc 1 from rotating forward or reverse, ensuring that the stop seat 3 can completely limit the rotation of the gear disc 1, avoiding the gear disc 1 from rotating. Make a slight rotation, which affects the performance of the pan-tilt head; at all the contact positions between the side wall of the tooth groove 11 and the stop seat 3: the angle between the pressure direction of the side wall of the tooth groove 11 on the stop seat 3 and the movement direction of the contact position of the side wall of the tooth groove 11 with the stop seat 3 is in the range of 0°-20°. Compared with the technical solution with an angle greater than 20°, the pressure of the side wall of the tooth groove 11 on the stop seat 3 is smaller, so the friction between the side wall of the tooth groove 11 and the stop seat 3 is smaller, and it is easy to withdraw the stop seat 3 from the tooth groove 11, thereby facilitating the separation of the stop seat 3 from the gear disc 1 and improving the performance of the pan-tilt head.

[0043] See also Figure 2 and Figure 3 , the force analysis is conducted on the second protrusion 32 as the research object as follows:

[0044] The force F is the direction of the pressure exerted by the side wall of the tooth groove 11 on the second protrusion 32. The direction of the component force F1 of the force F is the same as the direction of movement of the side wall of the tooth groove 11 at the abutment position with the second protrusion 32. The direction line of the component force F2 of the force F coincides with the radial direction line of the toothed disc 1. The angle a is the angle between the component force F1 and the force F.

[0045] When the angle a decreases, only a smaller force F is needed to make the component force F1 stop the gear plate 1. When the force F is small, the friction between the side wall of the tooth groove 11 and the second protrusion 32 will also decrease, making it easier for the second protrusion 32 to exit the tooth groove 11.

[0046] Further, see Figure 3 and Figure 4 As a specific embodiment of the gear engaging mechanism provided by the present invention, the pressure direction of the side wall of the tooth groove 11 on the stop seat 3 passes through the axis of the stop shaft 2, so that the force of the side wall of the tooth groove 11 on the stop seat 3 is completely used to push the stop seat 3 in the positive direction, avoiding the slight gap between the limiting hole 41 and the stop shaft 2 causing the stop seat 3 fixed on the stop shaft 2 to rotate slightly, affecting the stopping effect of the stop seat 3 on the gear disc 1, thereby affecting the performance of the gear engaging mechanism.

[0047] Further, see Figure 1 As a specific embodiment of the gear shifting mechanism provided by the present invention, the stopper 3 includes a first protrusion 31 and a second protrusion 32 for respectively extending into the tooth groove 11;

[0048] When the first protrusion 31 abuts against the side wall of one tooth groove 11, the second protrusion 32 abuts against the side wall of another tooth groove 11. By abutting the side walls of different tooth grooves 11 by the first protrusion 31 and the second protrusion 32, the stop seat 3 stops the gear disc 1 across the tooth groove 11, so as to reduce the size of the stop seat 3 and the gear disc 1, thereby reducing the size of the gear shifting mechanism and reducing the processing cost of the stop seat 3.

[0049] Further, see Figure 1 As a specific embodiment of the gear shifting mechanism provided by the present invention, the first protrusion 31 abuts against the side wall of one tooth groove 11 in the forward rotation direction of the sprocket disc 1, and the second protrusion 32 abuts against the side wall of the other tooth groove 11 in the reverse rotation direction of the sprocket disc 1, which facilitates the assembly of the stop seat 3 and the sprocket disc 1, and also facilitates the processing of the stop seat 3 to reduce the processing cost of the stop seat 3.

[0050] Further, see Figure 2 As a specific embodiment of the shifting mechanism provided by the present invention, the width of the first protrusion 31 and the width of the second protrusion 32 are both smaller than the groove width of the tooth groove 11, so as to reduce the volume of the first protrusion 31 and the second protrusion 32, and also reduce the friction between the first protrusion 31 and the side wall of the tooth groove 11 and the friction between the second protrusion 32 and the side wall of the tooth groove 11, thereby facilitating the separation of the first protrusion 31 and the second protrusion 32 from the tooth groove 11.

[0051] Further, see Figure 2 As a specific embodiment of the gear shifting mechanism provided by the present invention, a first stop surface 111 is provided on the opposite side walls of the tooth groove 11, a second stop surface 311 abutting against the first stop surface 111 is provided on the outer wall of the first protrusion 31, and a third stop surface 321 abutting against the first stop surface 111 is provided on the outer wall of the second protrusion 32, so that the side wall of the tooth groove 11 is in contact with the first protrusion 31 and the second protrusion 32, thereby reducing the wear of the side wall of the tooth groove 11 and the first protrusion 31 and the second protrusion 32, and extending the service life of the gear shifting mechanism.

[0052] Further, see Figure 2 As a specific embodiment of the gear shifting mechanism provided by the present invention, the first stop surface 111 is connected to the outer circumferential surface of the sprocket 1, so that the first stop surface 111 is close to the outer circumferential surface of the sprocket 1 to reduce the radial size of the sprocket 1.

[0053] Further, see Figure 4 and Figure 5 As a specific embodiment of the gear shifting mechanism provided by the present invention, the two first stop surfaces 111 of the same tooth groove 11 are both inclined and close to each other in the direction in which the stop seat 3 is inserted into the tooth groove 11. In the process of inserting the first protrusion 31 and the second protrusion 32 into the tooth groove 11, the first stop surface 111 can be used to guide the first protrusion 31 and the second protrusion 32 to facilitate the insertion of the first protrusion 31 and the second protrusion 32 into the tooth groove 11.

[0054] Further, see Figure 2 As a specific embodiment of the gear shifting mechanism provided by the present invention, the two first stop surfaces 111 of the same tooth groove 11 are inclined toward the opening direction of the tooth groove 11 and gradually move away from each other. When assembling the sprocket 1 and the stop seat 3, it is only necessary to push the stop seat 3 along the radial direction of the sprocket 1 and then perform subsequent installation, which improves the assembly efficiency and can also make the direction of the resultant force of the sprocket 1 on the stop seat 3 away from the direction of the sprocket 1 along the radial direction of the sprocket 1, thereby avoiding the sprocket 1 from generating a rotational component force, so as to improve the stopping effect of the stop seat 3 on the sprocket 1.

[0055] See also Figure 1 and Figure 4 The present invention further provides a pan / tilt platform, which includes a plurality of damping plates (not shown in the figure) and the gear shifting mechanism described in any of the above embodiments, wherein the damping plates are fixed on the central axis and abut against the gear plate 1;

[0056] When the stopper 3 is inserted into the tooth groove 11, the damping plate and the toothed disc 1 rotate relative to each other;

[0057] When the stop seat 3 exits the tooth groove 11 , the damping plate and the toothed disc 1 rotate synchronously.

[0058] Compared with the prior art, the pan-tilt head provided by the present invention reduces the angle between the pressure direction of the side wall of the tooth groove 11 on the stop seat 3 and the movement direction of the side wall of the tooth groove 11 and the abutment position of the stop seat 3, so as to reduce the friction between the tooth groove 11 and the stop seat 3, so that the stop seat 3 is easily separated from the tooth groove 11; when the stop seat 3 stops the rotation of the gear disc 1, the gear disc 1 stops rotating, and the center shaft drives the damping plate to rotate relative to the gear disc 1, thereby generating damping; when the stop seat 3 is separated from the gear disc 1, the center shaft drives the damping plate to rotate, and the friction between the damping plate and the gear disc 1 will drive the gear disc 1 to rotate, so that the pan-tilt head does not generate damping; therefore, by controlling whether the stop seat 3 and the gear disc 1 are stopped, whether the pan-tilt head has damping or not can be realized, which is convenient for the cameraman to choose whether the pan-tilt head has damping or not.

[0059] Specifically, a damping grease layer is provided between the gear disc 1 and the damping plate. The damping grease layer has a buffering effect and can enhance the user's feel when using the gimbal.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The gear engaging mechanism is characterized by: It includes a gear disc, a center shaft, a stop shaft, a stop seat and a base; The toothed disc is rotatably mounted on the central shaft; The stop seat is fixed on the stop shaft, the base is provided with a limiting hole, the stop shaft is arranged in the limiting hole, and the limiting hole can prevent the stop shaft from rotating; The toothed disc is provided with a plurality of tooth grooves in the circumference thereof, and the stop seat can abut against the side walls of the tooth grooves to prevent the toothed disc from rotating forward or reversely; The stop shaft can move relative to the base along the axial direction of the stop shaft so that the stop seat is inserted into or withdrawn from the tooth groove; At all abutment positions of the side wall of the tooth groove and the stop seat: the angle between the pressure direction of the side wall of the tooth groove on the stop seat and the movement direction of the abutment position of the side wall of the tooth groove and the stop seat is in the range of 0°-20°; The pressure direction of the side wall of the tooth groove on the stop seat passes through the axis of the stop shaft.

2. The gear shifting mechanism according to claim 1, characterized in that: The stop seat includes a first protrusion and a second protrusion respectively configured to extend into the tooth groove; When the first protrusion abuts against a side wall of one of the tooth grooves, the second protrusion abuts against a side wall of the other tooth groove.

3. The gear shifting mechanism according to claim 2, characterized in that: The first protrusion abuts against a side wall of one of the tooth grooves in a forward rotation direction of the sprocket disc, and the second protrusion abuts against a side wall of the other tooth groove in a reverse rotation direction of the sprocket disc.

4. The gear shifting mechanism according to claim 2, characterized in that: The width of the first protrusion and the width of the second protrusion are both smaller than the groove width of the tooth groove.

5. The gear shifting mechanism according to claim 2, characterized in that: The first stop surface is provided on both opposite side walls of the tooth groove, the second stop surface abutting the first stop surface is provided on the outer wall of the first protrusion, and the third stop surface abutting the first stop surface is provided on the outer wall of the second protrusion.

6. The gear shifting mechanism according to claim 5, characterized in that: The first stop surface is in contact with the outer circumferential surface of the gear plate.

7. The gear shifting mechanism according to claim 5, characterized in that: The two first stop surfaces of the same tooth groove are both arranged obliquely and approach each other in the direction in which the stop seat is inserted into the tooth groove.

8. The gear shifting mechanism according to claim 5, characterized in that: The two first stop surfaces of the same tooth groove are both inclined toward the opening direction of the tooth groove and gradually move away from each other.

9. PTZ, characterized by: The gear shift mechanism comprises a plurality of damping plates and the gear shift mechanism according to any one of claims 1 to 8, wherein the damping plates are fixed on the central shaft and abut against the gear disc; When the stop seat is inserted into the tooth groove, the damping plate and the toothed disc rotate relative to each other; When the stop seat exits the tooth groove, the damping plate rotates synchronously with the toothed disc.

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