Limiting mechanism
A limiting mechanism includes: a base, a first bearing, a turntable, and a rocker assembly. The base includes a base body and a through hole. The first bearing is mounted in the through hole. The turntable includes a turntable body and a shifting lever. The rocker assembly includes a second bearing, a rocker, a slider, an elastic member, a movable magnet, and a fixed magnet. Two opposite sides of the base body corresponding to the slider are respectively provided with limiting portions evenly spaced from the slider. The shifting lever is limited through the slider and the limiting portion. The limiting mechanism of the present disclosure not only has fewer actions and has a simple structure, but also occupies a small space, has high reliability, and can reduce generation of noise.
1. A limiting mechanism for realizing limiting of forward and reverse rotation greater than 180°, comprising:
a base comprising a base body and a through hole passing through the base body and in a circle shape;
a first bearing mounted in the through hole and forming a fixed connection with the base body;
a turntable comprising a turntable body and a shifting lever, wherein the turntable body inserts into the first bearing and forms a fixed connection with the first bearing, and the turntable body is in a ring shape, the shifting lever is formed by protruding from a periphery of the turntable body, a rotational connection between the turntable body and the base body is realized through the first bearing; and
a rocker assembly, wherein the rocker assembly and the shifting lever are arranged on a same side of the base body; the rocker assembly comprises a second bearing fixedly connected to the base body, a rocker inserted into the second bearing and forming a fixed connection with the second bearing, a slider sleeved on the rocker to form a sliding connection with the rocker, an elastic member connected between the rocker and the slider, a movable magnet fixed to an end of the slider away from the rocker, and a fixed magnet fixed to the base body and arranged opposite to the movable magnet, the rocker at an initial position and the shifting lever are located on a straight line where a diameter of the turntable body is located, the slider is spaced apart from the turntable body, a rotational connection between the rocker and the base body is realized through the second bearing; two opposite sides of the base body corresponding to the slider along a circumferential direction of the base body are respectively provided with limiting portions evenly spaced from the slider;
wherein when the shifting lever rotates clockwise or counterclockwise to abut against the slider, the shifting lever is engaged with the slider; the shifting lever continuously rotates to push the slider to rotate and simultaneously cause the slider to stretch along an axial direction of the rocker until the shifting lever rotates from the initial position to greater than 180°, so that limiting is realized by causing the slider to abut against the limiting portion on a corresponding side.
2. The limiting mechanism as described in claim 1 , wherein the base further comprises an annular protruding portion, the annular protruding portion protrudes from an edge of the base body, surrounds the through hole, and has a notch; the notch is arranged directly opposite to the slider, planes on two sides of the notch serve as the two limiting portions on two opposite sides of the slider.
3. The limiting mechanism as described in claim 1 , wherein two opposites sides of the shifting lever are respectively provided with protruding bumps; two opposite sides of the slider are respectively provided with grooves recessed inward and matching the bumps; and when the shifting lever rotates clockwise or counterclockwise to abut against the slider, the shifting lever abuts against the grooves on the corresponding sides of the slider through the protruding bumps to form engagement.
4. The limiting mechanism as described in claim 1 , wherein a side of the rocker away from the base body is recessed inward to form a first accommodating groove, an end of the first accommodating groove away from the slider is provided with a protruding first mounting post; a side of the slider adjacent to the base is provided with a second accommodating groove recessed inward, an end of the second accommodating groove away from the rocker is provided with a protruding second mounting post, the second accommodating groove covers the rocker and forms a sliding connection with the rocker; and the elastic member is received in the first accommodating groove and the second accommodating groove, and two ends of the elastic member are respectively fixed to the first mounting post and the second mounting post.
5. The limiting mechanism as described in claim 4 , wherein guide grooves are respectively arranged by penetrating through two sides of the second accommodating groove; two pins arranged apart are respectively inserted in two sides of the first accommodating groove, and the two pins respectively extend into the guide grooves on the corresponding sides to limit a sliding stroke of the slider.
6. The limiting mechanism as described in claim 1 , wherein sliding contact surfaces of the slider and the rocker are both treated with diamond-like coating (DLC).
7. The limiting mechanism as described in claim 1 , wherein the base body comprises a first body portion in a cylinder shape and a first extension portion formed by protruding from a periphery of the first body portion, the through hole is formed in the first body portion, and the second bearing is fixedly connected to the first extension portion.
8. The limiting mechanism as described in claim 7 , wherein the first body portion is provided with a first fixing groove recessed inward, and the second bearing is mounted in the first fixing groove and forms a fixed connection with the first body portion; the first body portion is provided with a second fixing groove recessed inward, and the fixed magnet is mounted in the second fixing groove and forms a fixed connection with the first body portion; and a side of the slider adjacent to the first body portion is provided with a third fixing groove recessed inward, and the movable magnet is mounted in the third fixing groove and forms a fixed connection with the slider.
9. The limiting mechanism as described in claim 1 , wherein the turntable body comprises a second body portion in a ring shape and a second extension portion that protrudes from an inner edge of the second body portion along an axial direction thereof and is in a tubular shape, the second extension portion is inserted into and fixed to the first bearing, and the shifting lever is formed by protruding outwardly from a periphery of the second body portion along a radial direction thereof.
10. The limiting mechanism as described in claim 1 , wherein the elastic member is a spring.