CN212155564U

CN212155564U - Safety clutch

Info

Publication number: CN212155564U
Application number: CN201922302972.7U
Authority: CN
Inventors: 张勤业; 张国栋
Original assignee: Zhejiang Tongda Electrical Appliance Co ltd
Current assignee: Zhejiang Tongda Electrical Appliance Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-12-15
Anticipated expiration: 2029-12-19

Abstract

The utility model provides a safety clutch includes intermediate gear, dish spring and one-level gear, the one-level gear cover is put on intermediate gear, dish spring cover is put on intermediate gear, sets up the cavity position in the inside one side of one-level gear, the outside one side of one-level gear is provided with the locked groove of a style of calligraphy, intermediate gear is provided with the through-hole with the corresponding position of locked groove, it cooperatees with the locked groove to run through being provided with the lock needle in the through-hole. When the excessive reverse torque generated by the clamping stagnation of the drill bit is transmitted to a user in the using process of the drilling tool, the first-stage gear generates pressure towards the hand to enable the first-stage gear to be pressed inwards, so that the lock pin is popped out of the lock groove, the first-stage gear starts to idle, and the torque generated by the clamping stagnation of the drill bit cannot injure the user.

Description

Safety clutch

Technical Field

The utility model belongs to the clutch field, concretely relates to safety clutch.

Background

Hand-held power tools, such as hammer drills, are typically driven by an electric motor that rotates rapidly and stores a lot of rotational energy due to its moment of inertia. In order to protect the user from impermissible deflections in critical operating states, in particular when the tool is jammed, the drive energy must be damped sufficiently quickly or the drive train between the motor storing the rotational energy and the tool must be disconnected sufficiently quickly. For more powerful hand-held power tools, the drive energy cannot be attenuated quickly enough without additional measures.

The publication number CN207364214U discloses an electric tool clutch, which comprises a motor, a motor shaft driven by the motor to generate a rotary motion, an output shaft, and a working head arranged on the output shaft, wherein a clutch mechanism is arranged between the motor shaft and the output shaft, a power gear is arranged on the motor shaft, a matching gear is arranged on the output shaft, the clutch mechanism comprises a middle shaft, a transmission gear fixedly arranged on the middle shaft and meshed with the matching gear, a clutch fixedly arranged on the middle shaft, a primary gear arranged on the circumferential periphery of the clutch and meshed with the power gear, the clutch has a first state of being fixed relative to the primary gear and a second state of being capable of rotating circumferentially relative to the primary gear, the clutch has a body in interference fit with the middle shaft and a plurality of clutch forks circumferentially and annularly arranged on the axial end surface of the body, the inner ring of the primary gear is provided with a plurality of grooves at intervals in an annular shape, the clutch fork is matched with the grooves in a first state, when the counter torque force applied to the output shaft is larger than a preset value, the clutch fork generates elastic deformation relative to the body, the clutch fork is disengaged from the grooves, and at the moment, the clutch is in a second state. The clutch is complex in structure and not high in safety and reliability.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to clutch structure is comparatively complicated among the prior art, and security and reliability drawback not high provide a simple structure, a safety clutch that security and reliability are better.

The invention aims to be realized by the following technical scheme: the utility model provides a safety clutch, includes intermediate gear, dish spring and one-level gear, the one-level gear cover is put on intermediate gear, dish spring cover is put on intermediate gear, sets up the cavity position in the inside one side of one-level gear, the outside one side of one-level gear is provided with the locked groove of a style of calligraphy, intermediate gear is provided with the through-hole with the corresponding position of locked groove, it cooperatees with the locked groove to run through being provided with the lock needle in the through-hole. When the excessive reverse torque generated by the clamping stagnation of the drill bit is transmitted to a user in the using process of the drilling tool, the first-stage gear generates pressure towards the hand to enable the first-stage gear to be pressed inwards, so that the lock pin is popped out of the lock groove, the first-stage gear starts to idle, and the torque generated by the clamping stagnation of the drill bit cannot injure the user.

Preferably, the primary gear is a semi-closed structure, and the inward side of the primary gear is hollow. The hollow one side can make the dish spring can set up in the inside of one-level gear, makes the effect of dish spring can the maximize.

Preferably, the dish springs are composed of three groups, the first group is composed of the dish springs, the convex surface of the first group is abutted against one side of the intermediate gear, the concave surfaces of the first two dish springs are matched, the second group is composed of the two dish springs, the convex surface of the second group is abutted against the convex surface of the other side of the first dish spring, the concave surfaces of the second two dish springs are matched, the third group is composed of one dish spring, the convex surface of the third group is abutted against the convex surface of the other side of the second dish spring, and the concave surface of the third group is abutted against the inner wall of the hollow surface of the primary gear. Two liang of dish springs mutually support can make the elasticity maximize of dish spring, and make the life of dish spring can increase.

Preferably, the outward protruding part of the primary gear is provided with a straight locking groove. The locking groove is arranged, so that the safety of the clutch can be improved, the position of the first-stage gear can be fixed, and the position of the first-stage gear cannot be changed.

Preferably, the lock pin is cylindrical, and the lock pin penetrates through the through hole of the intermediate gear and is arranged in the straight lock groove. The lock pin is matched with the lock groove, so that the safety of the clutch is improved on one hand, and the position of the first-stage gear cannot be changed on the other hand.

Compared with the prior art, the utility model discloses following beneficial effect has: through mutually supporting of lock needle and dish spring, be the safety clutch more safety, when the drilling instrument transmits for the user because of the excessive reverse torsion that the jamming of drill bit produced in the use, the one-level gear produces and causes the one-level gear to inwards press to the pressure of hand, thereby the lock needle pops out the locked groove, and the one-level gear begins the idle running, makes the torsion that the jamming of drill bit produced can not harm the user, this clutch simple structure, and security and reliability are higher.

Drawings

FIG. 1 is a longitudinal cross-sectional view of the clutch not engaged with a primary gear;

FIG. 2 is a longitudinal cross-sectional view of the clutch engaging the primary gear;

FIG. 3 is a longitudinal cross-sectional view of a primary gear;

the labels in the figure are: 1. an intermediate gear; 2. a disc spring; 3. a primary gear; 4. a first-stage gear hollow part; 5. locking the groove; 6. a through hole; 7. and (6) locking the needle.

Detailed Description

The invention will be further described with reference to the embodiments shown in the drawings to which:

example 1

As shown in fig. 1 and 2, a safety clutch comprises an intermediate gear 1, a disc spring 2 and a primary gear 3, wherein the primary gear 3 is sleeved on the intermediate gear 1, the disc spring 2 is sleeved on the intermediate gear 1 and is arranged at a hollow part 4 at the inward side of the primary gear 3, a linear locking groove 5 is arranged at the outward side of the primary gear 3, a through hole 6 is arranged at a position of the intermediate gear 1 corresponding to the locking groove 5, a locking pin 7 is arranged in the through hole 6 and is matched with the locking groove 5, when excessive reverse torque generated by clamping stagnation of a drill bit during the use of a drilling tool is transmitted to a user, the primary gear 3 generates pressure towards the hand to cause the primary gear 3 to be pressed inwards, so that the locking pin 7 is popped out of the locking groove 5, the primary gear 3 starts to idle, the torque generated by clamping stagnation of the drill bit cannot harm the user, the disc spring 2 comprises three groups, first group comprises dish spring 2, and its convex one side is leaned on and is put on one side of intermediate gear 1, the sunken one side cooperation of two dish springs 2 of first group, the second group comprises two dish springs 2, and its convex one side is leaned on and is put on the convex surface of 2 opposite sides of first group dish spring, the sunken one side cooperation of two dish springs 2 of second group, and dish spring 2 of third group comprises one, and its convex one side is leaned on and is put on the convex surface of 2 opposite sides of second group dish spring, and the sunken one side of dish spring 2 of third group is leaned on and is put on the inside wall of one-level gear 3 mid-air, and two liang of dish springs 2 mutually support can make the elasticity maximize of dish spring 2, and make dish spring 2's life can increase.

As shown in fig. 3, the primary gear 3 is a semi-closed structure, and an inward side thereof is a hollow portion 4. One side of hollow portion 4 can make dish spring 2 can set up in the inside of one-level gear 3, makes the effect of dish spring 2 can maximize, one-level gear 3 is provided with a word locked groove 5 to the bellied part in outside, sets up locked groove 5 and can make the security of clutch increase, can also fix the position of one-level gear 3, can not make one-level gear 3 produce the position change.

The utility model discloses a mutually supporting of lock needle and dish spring is the more safety of safety clutch, when boring type instrument in the use because of the excessive reverse torsion that produces of the jamming of drill bit transmits for the user, the one-level gear produces and causes the one-level gear to inwards press to the pressure of hand to the lock needle pops out the locked groove, and the one-level gear begins idle running, makes the torsion that the drill bit jamming produced can not injure the user, this clutch simple structure, and security and reliability are higher.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a safety clutch, its characterized in that includes intermediate gear (1), dish spring (2) and one-level gear (3), the one-level gear cover is put on intermediate gear, the dish spring cover is put on intermediate gear, sets up cavity position (4) in the inside one side of one-level gear, the outside one side of one-level gear is provided with lockgroove (5) of a style of calligraphy, intermediate gear and the corresponding position of lockgroove are provided with through-hole (6), it cooperatees with the lockgroove to run through being provided with lock needle (7) in the through-hole.

2. The security clutch of claim 1, wherein said primary gear is a semi-enclosed structure with a hollow inward side.

3. A security clutch according to claim 1 or 2, characterized in that the disc springs are composed of three groups, the first group consisting of disc springs, the convex side of which rests on one side of the intermediate gear, the concave sides of the first two disc springs cooperating, the second group consisting of two disc springs, the convex side of which rests on the convex side of the other side of the first disc spring, the concave sides of the second two disc springs cooperating, the third group consisting of one, the convex side of which rests on the convex side of the other side of the second disc spring, the concave side of the third disc spring resting on the inner wall of the hollow side of the primary gear.

4. The safety clutch according to claim 1, wherein the portion of the primary gear protruding to the outside is provided with a linear locking groove.

5. The security clutch of claim 1, wherein the locking pin is cylindrical and is disposed in the in-line locking slot through the through hole of the intermediate gear.