Self-locking speed reducer

Abstract

The utility model discloses a speed reducer capable of being self-locked. Comprising a shell; the center shaft is rotationally arranged on the machine shell, and a flange eccentrically arranged with the center shaft is arranged on the outer wall of the center shaft; the worm gear is mounted on the central shaft and rotates synchronously with the central shaft; the worm is installed on the machine shell and is in transmission connection with the worm gear; and the eccentric disc is assembled on the flange, the inner ring of the eccentric disc is eccentric relative to the central shaft, and teeth in transmission fit with the worm are circumferentially arranged on the outer ring of the eccentric disc. The eccentric disc is arranged on the edge of the worm wheel and combined with the worm wheel to be matched with the worm, and when the outer ring of the worm wheel is abraded or damaged, the worm and the eccentric brake disc can be seized, so that rotation of the speed reducer is stopped, the self-locking purpose is achieved, safety is improved, and safety accidents are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a speed reducer with self-locking function. Background Art

[0002] Speed reducers are commonly used as speed reduction transmission devices between prime movers and working machines, playing the role of matching speeds and transmitting torques between prime movers and working machines or actuators, and are widely used in modern machinery. For example, they are applied in the field of electric doors to connect motors and reduce the speed of the motors to drive rolling doors and rapid doors to open and close up and down.

[0003] For speed reducers using worm and worm wheel transmission, since the worm wheel is generally made of copper and has a relatively soft texture, while the worm is generally made of steel, the worm wheel is prone to wear or tooth breakage during the operation of the speed reducer, especially under extreme use or excessive torque.

[0004] After the worm wheel is worn or damaged, the gear meshing function between the worm wheel and the worm will fail, resulting in the sliding of rolling doors and rapid doors and safety accidents. Summary of the Utility Model

[0005] Aiming at the deficiencies in the prior art, the utility model provides a speed reducer with self-locking function. An eccentric disc is arranged beside the worm wheel and is combined with the worm wheel to cooperate with the worm. When the outer ring of the worm wheel is worn or damaged, the worm will jam with the eccentric brake disc, thereby stopping the rotation of the speed reducer and achieving the purpose of self-locking.

[0006] To solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A speed reducer with self-locking function, comprising

[0008] A housing;

[0009] A central shaft rotatably arranged on the housing, and a flange eccentrically arranged with respect to the outer wall of the central shaft;

[0010] A worm wheel mounted on the central shaft and rotating synchronously with it;

[0011] A worm mounted on the housing and in transmission connection with the worm wheel; and

[0012] An eccentric disc assembled on the flange, with its inner circle eccentric with respect to the central shaft and teeth meshing with the worm circumferentially arranged on its outer circle.

[0013] In the above technical solution, preferably, the central shaft is in transmission connection with a long shaft linked with an electric door, and the worm is in transmission connection with a motor.

[0014] In the above technical solution, preferably, the central shaft is key-connected to the worm wheel.

[0015] In the above technical solution, preferably, the shape and size of the inner ring of the eccentric disc are adapted to the shape and size of the flange.

[0016] In the above technical solution, preferably, the teeth circumferentially arranged on the outer ring of the eccentric disc are arranged on the side of the eccentric disc close to the worm gear.

[0017] In the above technical solution, preferably, the number and position of the teeth provided on the outer ring of the eccentric disc correspond to the number and position of the teeth on the worm gear.

[0018] In the above technical solution, preferably, the shape and size of the outer ring of the eccentric disc are the same as the shape and size of the outer ring of the worm gear.

[0019] In the above technical solution, preferably, a transmission rod is rotatably provided on the housing, a gear is fixedly provided at the lower end of the transmission rod, and a tooth portion engaged with the gear is circumferentially provided on the outer wall of the central shaft.

[0020] The beneficial effects of the present utility model are as follows:

[0021] In the present utility model, an eccentric disc is arranged beside the worm gear, and the worm gear and the eccentric disc are combined with the worm. When the outer ring of the worm gear is worn or damaged, the worm will jam with the eccentric brake disc, thereby stopping the rotation of the speed reducer, achieving the purpose of self-locking, improving safety, and avoiding the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the present utility model.

[0023] Figure 2 It is a schematic diagram of the internal structure of the housing of the present utility model.

[0024] Figure 3 It is another perspective schematic diagram of the internal structure of the housing of the present utility model.

[0025] Figure 4 It is a schematic diagram of the central shaft of the present utility model.

[0026] Figure 5 It is a side view schematic diagram of the central shaft of the present utility model.

[0027] Figure 6 It is a side view schematic diagram after the combination of the eccentric disc and the worm gear of the present utility model.

[0028] Figure 7 It is a schematic diagram of the eccentric disc of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present utility model will be further described in detail below in conjunction with the drawings and the specific embodiments:

[0030] See Figures 1 - 7 , a self-locking speed reducer, including a housing 1, a central shaft 2, a worm gear 3, a worm 4 and an eccentric disc 5.

[0031] The central shaft 2 and the worm 4 are respectively rotatably arranged at corresponding positions of the housing 1, and corresponding bearings can be arranged at the contact parts between the central shaft 2 and the housing 1 and between the worm 4 and the housing 1.

[0032] The central shaft 2 has a fitting hole 21 at its center for fitting with the long shaft. The central shaft 2 is key-connected to the long shaft so that the two can rotate synchronously. The long shaft is used to be linked with the electric door. That is, after the central shaft is driven to rotate, it can cause the electric door to open and close up and down.

[0033] The worm gear 3 is installed on the central shaft 2 and rotates synchronously with it. At the same time, the worm gear 3 is also in transmission connection with the worm 4, and the worm 4 is in transmission connection with the motor. Taking the motor as the power source, relying on the worm 4 to drive the worm gear 3 to rotate, the central shaft 2 and the long shaft then rotate accordingly, so as to realize the up and down opening and closing of the electric door.

[0034] As one of the implementation manners, the central shaft 2 is key-connected to the worm gear 3.

[0035] In this embodiment, as Figure 4 , Figure 5 shown, there is a flange 22 eccentrically arranged on the outer wall of the central shaft 2, that is, the outer peripheral wall of the flange 22 is not concentric with the axis of the central shaft 2. The eccentric disc 5 is installed on the flange 22, and the shape and size of its inner ring 51 are adapted to those of the flange 22, so that its inner ring 51 is also eccentric with respect to the central shaft 2.

[0036] In this embodiment, as Figure 2 , Figure 3 shown, the eccentric disc 5 is arranged on one side of the worm gear 3. As one of the implementation manners, the side wall of the eccentric disc 5 is attached to the side wall of the worm gear 3.

[0037] As Figure 6 , Figure 7 shown, on the outer ring 52 of the eccentric disc 5, teeth 53 in transmission cooperation with the worm 4 are circumferentially arranged on the side close to the turbine 3, and the number and position of the teeth 53 correspond to those of the teeth on the worm gear 3, so that the worm 4 can drive the eccentric disc 5 to rotate synchronously.

[0038] As one of the implementation manners, the shape and size of the outer ring 52 of the eccentric disc 5 are the same as those of the outer ring of the worm gear.

[0039] During normal use, both the eccentric disc 5 and the worm gear 3 are driven to rotate by the worm 4. It can be understood that the eccentric disc 5 and the outer ring of the worm gear rotate concentrically together;

[0040] After the worm wheel 3 is worn or damaged (such as the outer circle falling off), the tooth matching effect between the worm wheel 3 and the worm 4 is lost. The worm 4 only forms a matching relationship with the eccentric disc 5. The eccentric disc 5 rotates. Due to being eccentric with the central shaft 2 (the eccentric flange is matched with the inner ring of the eccentric disc), the worm 4 and the eccentric disc 5 will be stuck, so that the central shaft 2 stops rotating to prevent the rolling door and the rapid door from slipping and avoid safety accidents.

[0041] In this embodiment, a transmission rod 61 is rotatably arranged on the machine housing 1. A gear 62 is fixedly arranged at the lower end of the transmission rod 61. A tooth part 23 meshing with the gear 62 is circumferentially arranged on the outer wall of the central shaft 2. A tooth matching relationship is formed between the gear and the central shaft. By calculation, the number of rotations of the central shaft is rotated 1:1. A controller is connected to the top of the transmission rod to calculate the number of rotations and the forward and reverse directions, and then data is transmitted to the motor through the controller to control the opening and closing degree of the door.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A self-locking reducer, characterized in that: include chassis; A central shaft is rotatably mounted on the housing, and an outer wall of the central shaft includes a flange eccentrically mounted thereto; A worm gear is mounted on the central shaft and rotates synchronously therewith; a worm, which is mounted on the housing and drivingly connected to the worm wheel; and An eccentric disk is mounted on the flange, the inner ring of which is eccentric relative to the central axis, and the outer ring is circumferentially provided with teeth that cooperate with the worm drive.

2. A self-locking reducer according to claim 1, characterized in that: The central shaft is drivingly connected to a long shaft linked to the electric door, and the worm is drivingly connected to the motor.

3. A self-locking reducer according to claim 1, characterized in that: The central shaft is keyed to the worm gear.

4. A self-locking reducer according to claim 1, characterized in that: The shape and size of the inner ring of the eccentric disk are matched with the shape and size of the flange.

5. A self-locking reducer according to claim 1, characterized in that: The teeth circumferentially arranged on the outer ring of the eccentric disk are arranged on a side of the eccentric disk close to the worm wheel.

6. A self-locking reducer according to claim 1, characterized in that: The number and position of the teeth arranged on the outer ring of the eccentric disc correspond to the number and position of the teeth on the worm wheel.

7. A self-locking reducer according to claim 1, characterized in that: The shape and size of the outer ring of the eccentric disk are the same as the shape and size of the outer ring of the worm gear.

8. The self-locking reducer according to claim 1, characterized in that: A transmission rod is rotatably arranged on the housing, a gear is fixedly arranged at the lower end of the transmission rod, and a toothed portion meshing with the gear is circumferentially arranged on the outer wall of the central shaft.

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