CN213117212U - External star wheel type overrunning clutch - Google Patents

Abstract

The utility model provides a planetary wheel formula freewheel clutch, including fixing base, input assembly and a plurality of locking unit, the fixing base inner wall has evenly seted up a plurality of along the axial and has been used for the one-to-one setting the locking groove of locking unit, input assembly outer wall and a plurality of the locking unit offsets in order to realize the input assembly folk prescription is to rotatory. The utility model relates to a friction is little when external star wheel formula freewheel clutch can effectively realize the clutch idle running, and the higher and rotation stability's of rotational speed beneficial effect.

Description

External star wheel type overrunning clutch

Technical Field

The utility model relates to a clutch technical field particularly, relates to a wheeled freewheel clutch of foreign planet.

Background

The clutch has the functions of non-return, overrunning and positioning, and can be applied to occasions needing synchronization and clutching between a driving part and a driven part in the mechanical field. Such as: the device comprises a speed reducer, a lifting machine, a blower fan and mechanical equipment for spinning, printing, packaging and the like.

As shown in fig. 1, in the conventional overrunning clutch in the prior art, a locking unit 1 is usually disposed in an inner ring 2, so that when an input assembly drives the inner ring 2 to idle at a high speed, the inner ring 2 is not only subjected to a pre-tightening force applied by a spring 4 to an inner wall, but also a large outward centrifugal force is generated by a roller 5 itself, so that the roller 5 and an inner rolling wall surface of an outer ring 3 cling to each other to perform sliding friction, thereby causing high-temperature wear of the roller 5 in a high-speed friction state.

In view of the above, the inventor of the present application has invented an external planetary wheel type overrunning clutch which has small friction force, higher rotation speed and stable rotation when the clutch idles.

SUMMERY OF THE UTILITY MODEL

The utility model provides a friction is little when clutch idles, higher and the stable in rotation's of rotational speed external star wheel formula freewheel clutch.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides an outskirt wheel formula freewheel clutch, includes fixing base, input assembly and a plurality of locking unit, the fixing base inner wall is evenly seted up a plurality of along the axial and is used for the one-to-one setting the locking groove of locking unit, input assembly outer wall and a plurality of the locking unit offsets in order to realize the input assembly unilateral is rotatory.

As a further improvement, the locking unit comprises a pre-tightening spring, a supporting top plate and a locking roller, the supporting top plate is abutted against the side face of the locking roller, one end of the pre-tightening spring is connected with the side face of the supporting top plate, and the other end of the pre-tightening spring is abutted against the inner wall of the locking groove.

As a further improvement, the elastic force direction of the pre-tightening spring is tangent to the inner wall of the fixed seat after extending.

As a further improvement, the locking groove comprises a roller movable groove part and a top plate limiting groove part.

As a further improvement, the roller movable groove is waist-shaped, and the top plate limiting groove part is rectangular strip-shaped.

As a further development, the number of pretensioning springs per locking unit is two.

As a further improvement, the supporting top plate is provided with spring limiting grooves used for limiting and fixing the pre-tightening springs one by one along the elastic direction.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model relates to a structure that external star wheel formula freewheel clutch set up the locking unit in the fixing base can effectively realize supporting the locking unit through fixing base self structure for the input assembly only receives the pretightning force of pretension spring when idling, frictional force is very little, so its linear velocity wearing and tearing are also littleer, then the rotational speed when the input assembly idles can be higher, avoid traditional clutch to set up the locking unit in the input assembly and when leading to high-speed idling, the locking roller produces high temperature wear's problem with the outer loop inner wall under high-speed friction state.

2. The utility model relates to a locking unit among external star wheel formula freewheel clutch adopts the triplex structure to constitute, and the cooperation through locking roller and supporting the roof can effectively realize the locking roller and receive firm extrusion supporting the roof when pressure, can effectively be firm with the power of locking roller through supporting the roof and the cooperation of pretension spring and transmit to pretension spring extrusion spring in order to let a locking roller realize the unidirectional rotation of input module.

3. The utility model relates to a structure setting that external star wheel formula freewheel clutch adopted locking groove can effectively guarantee on the one hand that the locking roller moves along the spring compression direction steadily under the rotatory drive of input module to when guaranteeing the input module folk prescription to idle running, reach minimum with locking roller frictional force, on the other hand also can guarantee when input module reverse output, can stably promote the locking roller and pop out the direction removal toward the spring, with the realization through the outer wall of locking roller and the support of input module outer wall tightly guarantee the unable reverse rotation of input module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a prior art overrunning clutch;

fig. 2 is a schematic structural view of an external star wheel type overrunning clutch of the present invention;

fig. 3 is an exploded view of the external planetary wheel type overrunning clutch of the present invention;

fig. 4 is a schematic structural view showing the engagement between the supporting top plate and the pre-tightening spring in the external planetary wheel type overrunning clutch of the present invention;

fig. 5 is a schematic structural view of a fixing seat in the external planetary wheel type overrunning clutch of the present invention.

Description of the main elements

10. A fixed seat; 11. a locking groove; 111. a roller movable groove part; 112. a top plate limiting groove part;

20. an input component;

30. a locking unit; 31. pre-tightening the spring; 32. supporting a top plate; 33. and locking the rollers.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 2 and 3, in an embodiment, an external star wheel type overrunning clutch includes a fixing seat 10, an input assembly 20, and a plurality of locking units 30, wherein a plurality of locking grooves 11 for one-to-one corresponding arrangement of the locking units 30 are uniformly formed in an inner wall of the fixing seat 10 along an axial direction, an outer wall of the input assembly 20 abuts against the plurality of locking units 30 to realize unidirectional rotation of the input assembly 20, and the input assembly 20 is engaged with and connected to a power input shaft.

Referring to fig. 2 to 4, the locking unit 30 includes a pre-tightening spring 31, a supporting top plate 32 and a locking roller 33, the supporting top plate 32 abuts against the side surface of the locking roller 33, a plane of the supporting top plate 32 abutting against the locking roller 33 is in an arc shape adapted to the side surface of the locking roller 33, one end of the pre-tightening spring 31 is connected to the side surface of the supporting top plate 32, and the other end of the pre-tightening spring abuts against the inner wall of the locking groove 11.

The locking unit 30 is composed of three parts, the locking roller 33 can be effectively and stably pressed on the supporting top plate 32 when receiving pressure through the matching of the locking roller 33 and the supporting top plate 32, and the force of the locking roller 33 can be effectively and stably transmitted to the pre-tightening spring 31 through the matching of the supporting top plate 32 and the pre-tightening spring 31 to press the spring so as to avoid the locking roller 33 to realize the unidirectional rotation of the input assembly 20.

The number of the locking units 30 can be flexibly selected according to the sizes of the input assembly 20 and the fixing base 10, and the requirements of uniform stress and centrosymmetric distribution are met.

The structure that the clutch sets up locking unit 30 in fixing base 10 can effectively realize supporting locking unit 30 through fixing base 10 self structure for input assembly 20 only receives the pretightning force of pretension spring 31 when idling, and frictional force is very little, so its linear velocity wearing and tearing are also littleer, and then the rotational speed when input assembly 20 idles can be higher, avoids traditional clutch to set up locking unit 30 in input assembly 20 and when leading to high-speed idling, locking roller 33 and outer loop inner wall produce the problem of high temperature wearing and tearing under high-speed friction state.

Referring to fig. 3 and 5, further, after the elastic force direction of the pre-tightening springs 31 extends, the pre-tightening springs 31 are tangent to the inner wall of the fixed seat 10, that is, the pre-tightening springs 31 are arranged at a certain angle with the circumferential rotation direction of the input assembly 20, and the whole pre-tightening springs 31 are arranged in a radial wheel shape; furthermore, the locking groove 11 includes a roller moving groove portion 111 and a top plate limiting groove portion 112, the roller moving groove is waist-shaped and parallel to the elastic direction of the pre-tightening spring 31 for providing a sufficient space for the locking roller 33 to move along the elastic direction, and the top plate limiting groove portion 112 is rectangular strip for limiting the movement space of the fixed supporting top plate 32.

The structure that adopts locking groove 11 sets up on the one hand and can effectively guarantee that locking roller 33 moves along the spring compression direction steadily under the rotatory drive of input module 20 to when guaranteeing that the unilateral idle running of input module 20 reaches minimum with locking roller 33 frictional force, on the other hand also can guarantee when input module 20 reverse output, can stably promote locking roller 33 and pop out the direction and remove toward the spring, in order to realize guaranteeing through supporting of locking roller 33's outer wall and input module 20 outer wall that input module 20 can't reverse rotation.

In addition, referring to fig. 4, preferably, the number of the pre-tightening springs 31 of each locking unit 30 is two, and the supporting top plate 32 is provided with spring limiting grooves for limiting and fixing the pre-tightening springs 31 one by one along the elastic direction; the supporting top plate 32 adopts a spring limiting groove structure, and can be matched with the two pre-tightening springs 31 to effectively ensure the overall structure stability of the locking unit 30, and the stable reciprocating sliding is realized by matching with the top plate limiting groove part 112.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An external star wheel type overrunning clutch is characterized in that: including fixing base (10), input subassembly (20) and a plurality of locking unit (30), a plurality of has evenly been seted up along the axial to fixing base (10) inner wall and has been used for the one-to-one to set up locking groove (11) of locking unit (30), input subassembly (20) outer wall and a plurality of locking unit (30) counterbalance in order to realize input subassembly (20) folk prescription is to rotatory.

2. The external planetary overrunning clutch of claim 1, wherein: the locking unit (30) comprises a pre-tightening spring (31), a supporting top plate (32) and a locking roller (33), the supporting top plate (32) abuts against the side face of the locking roller (33), one end of the pre-tightening spring (31) is connected with the side face of the supporting top plate (32), and the other end of the pre-tightening spring abuts against the inner wall of the locking groove (11).

3. The external planetary overrunning clutch of claim 2, wherein: the elasticity direction of the pre-tightening spring (31) is tangent to the inner wall of the fixed seat (10) after extending.

4. The external planetary overrunning clutch of claim 2, wherein: the locking groove (11) comprises a roller movable groove part (111) and a top plate limiting groove part (112).

5. The external planetary overrunning clutch of claim 4, wherein: the roller movable groove is waist-shaped, and the top plate limiting groove part (112) is rectangular strip-shaped.

6. The external planetary overrunning clutch of claim 5, wherein: the number of the pretensioning springs (31) per locking unit (30) is two.

7. The external planetary overrunning clutch of claim 6, wherein: and the supporting top plate (32) is provided with spring limiting grooves for limiting and fixing the pre-tightening springs (31) one by one along the elastic direction.

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