Locking device for worm gear and worm
By designing the locking device of the worm gear and worm gear, the coordination of the limiting part and the cylindrical lock head is used to solve the problem of the worm gear deviating from its initial position during driving, and effective control and stability improvement of worm gear movement is achieved.
Patent Information
- Application Number
- CN202411869390.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-04-11
AI Technical Summary
Due to the existence of gaps during driving, the existing worm gear pairs have high-frequency intermittent reciprocating movements such as impact, shaking, and vibration relative to the worm gear, and the self-locking conditions cannot be achieved, causing the worm gear to deviate from the initial relative position range and control failure.
A locking device for worm gear and worm is designed, through the hexagonal head of the worm, through the hexagonal hole in the limiting member, and the two cylindrical lock heads of the bearing end cover pass through the arc-shaped limiting hole, limiting the rotation range of the locking transposition relative to the bearing end cover, ensuring that the worm and the locking device move together, and limiting it to a controllable angle range.
It effectively limits the range of motion of the worm gear relative to the worm gear, prevents deviation from the initial position, ensures control effect, and has a small and compact structure, which is easy to disassemble and assemble, and is easy to promote.
Smart Images
Figure CN119802158A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of locking devices, and in particular relates to a locking device for a worm gear. Background Art
[0002] At present, in the existing worm gear pairs, if the helix angle of the worm is smaller than the equivalent friction angle between the meshing teeth of the worm and worm wheel, the worm will self-lock. In addition to selecting a suitable helix angle, the self-locking condition also requires a constant unilateral force (>0N) and a constant direction. Instantaneous unilateral force constant direction can also be achieved by adding an electrical load.
[0003] However, when the worm gear pair is set on a crane, during transportation, due to the existence of the worm gear gap, the worm wheel is subject to high-frequency intermittent reciprocating motion such as impact, shaking, and vibration relative to the worm, so its force cannot achieve the self-locking condition. After the angle difference caused by the relative motion accumulates, the worm gear will eventually deviate from the initial relative position range (rack position requirements), making the control ineffective. Summary of the invention
[0004] The purpose of the present invention is to solve the problem in the prior art that the worm wheel deviates from the initial relative position range during driving and cannot achieve self-locking with the worm, and to provide a locking device for a worm wheel and worm.
[0005] To achieve the above purpose, the technical solution provided by the present invention is:
[0006] A locking device for a worm gear is provided, wherein one end of the worm is rotatably connected to a bearing end cover via a bearing; a through hole is provided in the middle of the bearing end cover and is fixedly mounted on a bracket housing; one end of the worm passes through the through hole of the bearing end cover and has a hexagonal head, and the locking device is used to limit the rotation range of the worm relative to the bearing end cover; the locking device comprises two cylindrical locking heads and a limiting member; the two cylindrical locking heads are fixedly connected to the outer side surface of the bearing end cover and are evenly distributed on the upper and lower sides of the through hole; the limiting member has a hexagonal hole and two arc-shaped limiting holes evenly distributed on the upper and lower sides of the hexagonal hole; the hexagonal hole matches the hexagonal head and is used to be sleeved on the hexagonal head; the center of a circle corresponding to each arc-shaped limiting hole is located on the central axis of the hexagonal hole; and the two cylindrical locking heads pass through the two arc-shaped limiting holes respectively.
[0007] Furthermore, a limiting groove is provided on the side of each cylindrical lock head away from the central axis of the through hole; the limiting member has an upper cavity located above the hexagonal hole, and a lower cavity located below the hexagonal hole; the locking device also includes two tenons, which are respectively installed in the upper cavity and the lower cavity; each tenon includes a clamping block, one side of the clamping block is connected to a round rod, and the side of the clamping block away from the round rod can be clamped into the limiting groove; the top surface of the upper cavity and the bottom surface of the lower cavity are both provided with round holes, one tenon is movably arranged in the upper cavity, and the round rod of the tenon passes through the round hole on the top surface, and a spring is sleeved on the round rod between the top surface and the clamping block of the tenon; the other tenon is movably arranged in the lower cavity, and the round rod of the tenon passes through the round hole on the bottom surface, and a spring is sleeved on the round rod between the bottom surface and the clamping block of the tenon.
[0008] Furthermore, the limit member also has a left cavity and a right cavity located on both sides of the hexagonal hole, the upper and lower ends of the left cavity are respectively communicated with the upper cavity and the lower cavity, and the upper and lower ends of the right cavity are respectively communicated with the upper cavity and the lower cavity; a left stop block connected to the limit member is arranged in the left cavity, and a right stop block connected to the limit member is arranged in the right cavity; the upper end of the left stop block and the upper end of the right stop block serve as the downward stop points of the upper tenon, and the upper end of the left stop block and the lower end of the right stop block serve as the upward stop points of the lower tenon.
[0009] Furthermore, the center angle of the arc-shaped limiting hole is 60°; the centers of the two arc-shaped limiting holes are concentric with the center of the hexagonal hole.
[0010] Furthermore, the side of the clamping block facing away from the round rod is a concave arc. When the upper tenon moves downward to contact the upper ends of the left block and the right block, the center of the concave arc is collinear with the central axis of the worm; or, when the lower tenon moves upward to contact the lower ends of the left block and the right block, the center of the concave arc is collinear with the central axis of the worm.
[0011] Furthermore, a pull ring is provided at the end of each round rod.
[0012] Furthermore, the top of each cylindrical lock head has a first inclined surface that gradually becomes lower from the through hole radially outward; and each clamping block has a second inclined surface that matches the first inclined surface on the side facing the bearing end cover.
[0013] Furthermore, the bottom of the limiting groove is an arc-shaped surface extending circumferentially along the central axis of the through hole.
[0014] Furthermore, the radius of the arc surface is equal to the radius of the concave arc.
[0015] Furthermore, the left stopper is connected to the limiting member via bolts, and the right stopper is connected to the limiting member via bolts.
[0016] The advantages of the present invention are:
[0017] The locking device designed in the present invention allows the hexagonal head of the worm to pass through the hexagonal hole on the limiting piece, and the two cylindrical locking heads of the bearing end cover pass through the two arc-shaped limiting holes, so that the locking device can be sleeved in the worm gear pair; when the worm encounters reciprocating motions such as impact and shaking during movement, the arc-shaped limiting holes at the upper and lower ends cooperate with the cylindrical locking heads to limit; the rotation range of the locking transposition relative to the bearing end cover can be limited within a certain range, and the worm and the locking device move together, which can effectively limit the movement of the worm relative to the worm wheel within a controllable angle range. At the same time, the overall structure is small and compact, easy to disassemble and assemble, easy to store, and easy to implement and promote. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The features and advantages of the present invention will become more readily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and in which some features are exaggerated or minimized to show details of particular components:
[0019] Figure 1 is a partial schematic diagram of a worm gear pair installed on a bracket in an embodiment of the present invention;
[0020] Figure 2 is a schematic structural diagram of a worm gear locking device in an embodiment of the present invention;
[0021] Figure 3 is a cross-sectional schematic diagram of a worm gear locking device according to an embodiment of the present invention;
[0022] Figure 4 is a schematic structural diagram of an installation housing in an embodiment of the present invention;
[0023] Figure 5 is a schematic structural diagram of a bearing end cover in an embodiment of the present invention;
[0024] Figure 6 is a schematic diagram of the structure of the tenon in an embodiment of the present invention;
[0025] Figure 7 is a schematic structural diagram of a stopper in an embodiment of the present invention;
[0026] Figure 8 is a schematic structural diagram of a spring in an embodiment of the present invention;
[0027] In the figure: 1. worm; 2. thrust ball bearing; 3. angular contact ball bearing; 4. bracket housing; 5. bearing end cover; 6. locking device; 6-1. limit piece; 6-2. hexagonal hole; 6-3. tenon; 6-4. left stopper; 6-5. right stopper; 6-6. clamping block; 6-7. spring; 6-8. arc-shaped limit hole; 6-9. round rod; 7-cylindrical lock head; 7-1. limit groove. DETAILED DESCRIPTION
[0028] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.
[0029] A locking device for a worm gear, such as Figure 1 As shown, one end of the worm 1 is rotatably connected to the bearing end cover 5 through a bearing; Figure 5 As shown, the middle part of the bearing end cover 5 has a through hole and is fixedly mounted on the bracket housing 4; one end of the worm 1 passes through the through hole of the bearing end cover 5 and has a hexagonal head, and the locking device 6 is used to limit the rotation range of the worm 1 relative to the bearing end cover 5; the locking device 6 includes two cylindrical lock heads 7 and a limiter 6-1; Figure 5 As shown, two cylindrical lock heads 7 are fixedly connected to the outer side of the bearing end cover 5 and are evenly distributed on the upper and lower sides of the through hole; Figure 4 As shown, the limit member 6-1 has a hexagonal hole 6-2 and two arc-shaped limit holes 6-8 evenly distributed on the upper and lower sides of the hexagonal hole 6-2; the hexagonal hole 6-2 matches the hexagonal head and is used to be sleeved on the hexagonal head; the center of each arc-shaped limit hole 6-8 is located on the central axis of the hexagonal hole 6-2; and the two cylindrical lock heads 7 pass through the two arc-shaped limit holes 6-8 respectively.
[0030] The locking device 6 designed in this embodiment allows the hexagonal head of the worm 1 to pass through the hexagonal hole 6-2 on the limiting piece 6-1, and the two cylindrical lock heads 7 of the bearing end cover 5 pass through the two arc-shaped limiting holes 6-8, so that the locking device 6 can be sleeved in the worm gear 1 pair; when the worm 1 encounters reciprocating motions such as impact and shaking during travel, the arc-shaped limiting holes 6-8 at the upper and lower ends cooperate with the cylindrical lock heads 7 to limit; when the upper cylindrical lock head 7 is at the rightmost end of the upper arc-shaped limiting hole 6-8, and the lower cylindrical lock head 7 is at the leftmost end of the lower arc-shaped limiting hole 6-8, at this time, the locking device 6 When the upper cylindrical lock head 7 is at the leftmost end of the upper arc-shaped limit hole 6-8, the lower cylindrical lock head 7 is at the rightmost end of the lower arc-shaped limit hole 6-8, the locking device 6 can no longer rotate leftward relative to the bearing end cover 5, and the rotation range of the locking device 6 relative to the bearing end cover 5 can be limited within a certain range. The worm 1 and the locking device 6 move together, which can effectively limit the movement of the worm 1 relative to the worm wheel within a controllable angle range. At the same time, the overall structure is small and compact, easy to disassemble and assemble, easy to store, and easy to implement and promote.
[0031] like Figure 5 , 8 As shown, each cylindrical lock head 7 is provided with a limiting groove 7-1 on one side away from the central axis of the through hole; Figure 3As shown, the stopper 6-1 has an upper cavity located above the hexagonal hole 6-2, and a lower cavity located below the hexagonal hole 6-2; the locking device 6 also includes two tenons 6-3, and the two tenons 6-3 are respectively installed in the upper cavity and the lower cavity; Figure 3 , 6 As shown, each tenon 6-3 includes a clamping block 6-6, one side of the clamping block 6-6 is connected to a round rod 6-9, and the side of the clamping block 6-6 facing away from the round rod 6-9 can be clamped into the limiting groove 7-1; the top surface of the upper cavity and the bottom surface of the lower cavity are both provided with round holes, one tenon 6-3 is movably arranged in the upper cavity, and the round rod 6-9 of the tenon 6-3 passes through the round hole on the top surface, and a spring 6-7 is sleeved on the round rod 6-9 located between the top surface and the clamping block 6-6 of the tenon 6-3; another tenon 6-3 is movably arranged in the lower cavity, and the round rod 6-9 of the tenon 6-3 passes through the round hole on the bottom surface, and a spring 6-7 is sleeved on the round rod 6-9 located between the bottom surface and the clamping block 6-6 of the tenon 6-3.
[0032] In this embodiment, two self-locking tenons 6-3 are provided which can be inserted into the limiting groove 7-1 of the cylindrical lock head 7, so that the locking device 6 can be fixed on the bearing end cover 5. At this time, there is no need for manual fixation or the use of other tools; the round rod 6-9 provided on the tenon 6-3 cooperates with the spring 6-7, so that the locking block of the locking part of the tenon 6-3 can move up and down. Taking the upper tenon 6-3 as an example, the cooperation between the tenon 6-3 and the cylindrical lock head 7 is explained. First, pull the round rod 6-9 to make the clamping block 6-6 move upward. When the cylindrical lock head 7 moves to the arc-shaped limiting hole 6-8, the clamping block 6-6 moves downward to the limiting groove 7-1 of the cylindrical lock head 7 by relying on the elastic force of the spring 6-7. The tenon 6-3 located below also has the same movement principle. Through the cooperation of the two clamping blocks 6-6 and the limiting groove 7-1, the locking device 6 can be fixed on the cylindrical lock head 7, so that the worm 1 moves with the locking device 6, thereby limiting the movement range of the worm 1.
[0033] like Figure 3 , 7 As shown, the limit member 6-1 also has a left cavity and a right cavity located on both sides of the hexagonal hole 6-2, the upper and lower ends of the left cavity are respectively communicated with the upper cavity and the lower cavity, and the upper and lower ends of the right cavity are respectively communicated with the upper cavity and the lower cavity; a left stop block 6-4 connected to the limit member 6-1 is arranged in the left cavity, and a right stop block 6-5 connected to the limit member 6-1 is arranged in the right cavity; the upper end of the left stop block 6-4 and the upper end of the right stop block 6-5 serve as the downward stop point of the upper tenon 6-3, and the upper end of the left stop block 6-4 and the lower end of the right stop block 6-5 serve as the upward stop point of the lower tenon 6-3.
[0034] The left stopper 6-4 and the right stopper 6-5 are respectively connected to the limiter 6-1 by bolts. The position of the tenon 6-3 is limited by the set left stopper 6-4 and the right stopper 6-5, and the movement range of the upper tenon 6-3 and the lower tenon 6-3 can be limited. During installation, the tenon 6-3 is first pulled to a suitable position, and then the left stopper 6-4 and the right stopper 6-5 are installed. Through adjustment, the tenon 6-3 can be inserted into the limit slot 7-1.
[0035] like Figure 3 As shown, the center angle of the arc-shaped limit hole 6-8 is 60°; the centers of the two arc-shaped limit holes 6-8 are concentric with the center of the hexagonal hole 6-2. By setting the arc-shaped limit hole 6-8 concentric with the hexagonal hole 6-2 and having a center angle of 60°, the hexagonal head on the worm 1 can be inserted into the hexagonal hole 6-2 of the locking device 6 no matter which angle it rotates to, and the cylindrical lock head 7 can extend into the arc-shaped limit hole 6-8. At the same time, the rotation range of the worm 1 can be controlled to be 0° to 60°. By introducing the transmission ratio i into the calculation, it can be known that the worm wheel can be limited to 0° to (60 / i)°.
[0036] like Figure 6 As shown, the side of the clamping block 6-6 facing away from the round rod 6-9 is a concave arc. When the upper tenon 6-3 moves downward to contact the upper ends of the left stop block 6-4 and the right stop block 6-5, the center of the concave arc is collinear with the central axis of the worm 1; or, when the lower tenon 6-3 moves upward to contact the lower ends of the left stop block 6-4 and the right stop block 6-5, the center of the concave arc is collinear with the central axis of the worm 1.
[0037] In this embodiment, when the two latches 6-3 move to the upper stop point and the lower stop point respectively, the center of the concave arc is colinear with the central axis of the worm 1, and the contact area with the limiting groove 7-1 of the cylindrical lock head 7 is larger, and the locking effect is better.
[0038] like Figure 3 As shown, a pull ring is provided at the end of each round rod 6-9, and a small hole is provided on the round rod 6-9, through which the pull ring is installed, and the pull ring is located on the outside of the limit block. The set pull ring facilitates the movement of the tenon 6-3.
[0039] like Figure 1 , 5As shown, the top of each cylindrical lock head 7 has a first inclined surface that gradually decreases radially outward from the through hole; each clamping block 6-6 has a second inclined surface that matches the first inclined surface on the side facing the bearing end cover 5. The first inclined surface and the second inclined surface cooperate to facilitate the upward and downward movement of the tenon 6-3 of the locking device 6 under the action of the first inclined surface, so that the locking device 6 can move to the cylindrical lock head 7. When it moves to the limiting groove 7-1, the tenon 6-3 is clamped into the limiting groove 7-1 under the action of the spring 6-7 to complete the locking. The side surface of the clamping block 6-6 opposite to the second inclined surface is a straight surface, so that the locking of the clamping block 6-6 and the limiting groove 7-1 is more secure and will not slip out.
[0040] like Figure 5 As shown, the bottom of the limiting groove 7-1 is an arc surface extending circumferentially along the central axis of the through hole, thereby increasing the contact area between the concave arc surface and the limiting groove 7-1 at any angle and improving the locking effect of the tenon 6-3 and the cylindrical lock head 7.
[0041] like Figure 1 As shown, the radius of the arc surface is equal to the radius of the concave arc surface, ensuring that the concave arc surface is firmly in contact with the limiting groove 7-1 at any angle, and the contact area is larger, further improving the locking effect.
[0042] like Figure 3 As shown, the left stopper 6-4 is connected to the limiter 6-1 by bolts, and the right stopper 6-5 is connected to the limiter 6-1 by bolts. The left stopper 6-4 and the right stopper 6-5 are detachably mounted on the limiter 6-1, and each bolt is sleeved with a flat washer and a spring washer.
[0043] The installation steps of the locking device 6 are as follows:
[0044] 1. First, insert the spring 6-7 onto the round rod 6-9 of the tenon 6-3, and then place the two tenons 6-3 into the upper cavity and the lower cavity respectively, so that the round rods 6-9 of the tenon 6-3 pass through the round holes at the corresponding positions respectively;
[0045] 2. Use pull rings to pass through the small holes on the round rods 6-9 outside the upper and lower cavities;
[0046] 3. After using the pull ring to pull the upper tenon 6-3 and the lower tenon 6-3 to the appropriate positions, respectively, the left stopper 6-4 and the right stopper 6-5 are installed in the left cavity and the right cavity, respectively.
[0047] The locking process of the locking device 6 is as follows:
[0048] Align the hexagonal hole 6-2 of the locking device 6 with the hexagonal head of the worm 1, push the locking device 6 along the axial direction of the worm 1, the second inclined surface of the latch 6-3 cooperates with the first inclined surface of the cylindrical lock head 7, the upper latch 6-3 moves upward by the thrust, and the lower latch 6-3 moves downward by the thrust, and when it moves to the limiting groove 7-1, the latch 6-3 is locked into the limiting groove 7-1 of the cylindrical lock head 7 to complete the locking. When disassembling, the locking device 6 can be removed by simply pulling the pull ring apart in the upper and lower directions.
[0049] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.
Claims
1. A locking device for a worm gear, characterized in that: One end of the worm (1) is rotatably connected to the bearing end cover (5) via a bearing; the middle of the bearing end cover (5) has a through hole and is fixedly mounted on the bracket housing; one end of the worm passes through the through hole of the bearing end cover (5) and has a hexagonal head; the locking device (6) is used to limit the rotation range of the worm (1) relative to the bearing end cover (5); the locking device (6) comprises: Two cylindrical locks (7) are fixedly connected to the outer side of the bearing end cover (5) and are evenly distributed on the upper side and the lower side of the through hole; The limiting member (6-1) comprises a hexagonal hole (6-2) and two arc-shaped limiting holes (6-8) evenly distributed on the upper side and the lower side of the hexagonal hole (6-2); the hexagonal hole (6-2) matches the hexagonal head and is used for being sleeved on the hexagonal head; the center of a circle corresponding to each of the arc-shaped limiting holes (6-8) is located on the central axis of the hexagonal hole (6-2); and the two cylindrical lock heads (7) respectively pass through the two arc-shaped limiting holes (6-8).
2. The locking device according to claim 1, characterized in that: A limiting groove (7-1) is provided on the side of each cylindrical lock head (7) facing away from the central axis of the through hole; The limiting member (6-1) comprises an upper cavity located above the hexagonal hole (6-2), and a lower cavity located below the hexagonal hole (6-2); The locking device (6) further comprises two latches (6-3), the two latches (6-3) being respectively installed in the upper cavity and the lower cavity; each of the latches (6-3) comprises a clamping block (6-6), one side of the clamping block (6-6) being connected to a round rod (6-9), and a side of the clamping block (6-6) facing away from the round rod (6-9) can be clamped into the limiting groove (7-1); The top surface of the upper cavity and the bottom surface of the lower cavity are both provided with circular holes; one of the tenons (6-3) is movably arranged in the upper cavity, and the round rod (6-9) of the tenon (6-3) passes through the circular hole on the top surface, and a spring (6-7) is sleeved on the round rod (6-9) located between the top surface and the clamping block (6-6) of the tenon (6-3); the other tenon (6-3) is movably arranged in the lower cavity, and the round rod (6-9) of the tenon (6-3) passes through the circular hole on the bottom surface, and a spring (6-7) is sleeved on the round rod (6-9) located between the bottom surface and the clamping block (6-6) of the tenon (6-3).
3. The locking device according to claim 2, characterized in that: The limiting member (6-1) also comprises a left cavity and a right cavity located on both sides of the hexagonal hole (6-2); the upper and lower ends of the left cavity are respectively communicated with the upper cavity and the lower cavity, and the upper and lower ends of the right cavity are respectively communicated with the upper cavity and the lower cavity; a left stopper (6-4) connected to the limiting member (6-1) is arranged in the left cavity, and a right stopper (6-5) connected to the limiting member is arranged in the right cavity; the upper end of the left stopper (6-4) and the upper end of the right stopper (6-5) serve as the downward stop point of the upper tenon (6-3), and the upper end of the left stopper (6-4) and the lower end of the right stopper (6-5) serve as the upward stop point of the lower tenon (6-3).
4. The locking device according to claim 1 or 2, characterized in that: The central angle of the arc-shaped limiting hole (6-8) is 60°; The centers of the two arc-shaped limiting holes (6-8) are both concentric with the center of the hexagonal hole.
5. The locking device according to claim 3, characterized in that: The side of the clamping block (6-6) facing away from the round rod (6-9) is a concave arc. When the upper tenon (6-3) moves downward to contact the upper ends of the left stopper (6-4) and the right stopper (6-5), the center of the concave arc is collinear with the central axis of the worm; or, when the lower tenon (6-3) moves upward to contact the lower ends of the left stopper (6-4) and the right stopper (6-5), the center of the concave arc is collinear with the central axis of the worm.
6. The locking device according to claim 2, characterized in that: A pull ring (6-7) is provided at the end of each round rod (6-9).
7. The locking device according to claim 2, characterized in that: The top of each cylindrical lock head (7) has a first inclined surface which gradually becomes lower from the through hole radially outward; and the side of each clamping block (6-6) facing the bearing end cover has a second inclined surface matching the first inclined surface.
8. The locking device according to claim 2, characterized in that: The groove bottom of the limiting groove (7-1) is an arc-shaped surface extending circumferentially along the central axis of the through hole.
9. The locking device according to claim 5, characterized in that: The radius of the arc surface is equal to the radius of the concave arc.
10. The locking device according to claim 3, characterized in that: The left stopper (6-4) is connected to the position-limiting member (6-1) via bolts, and the right stopper (6-5) is connected to the position-limiting member (6-1) via bolts.