CN203962647U

CN203962647U - locking device

Info

Publication number: CN203962647U
Application number: CN201420413551.6U
Authority: CN
Inventors: 柴旭; 孙东坡
Original assignee: SAIC Motor Corp Ltd
Current assignee: SAIC Motor Corp Ltd
Priority date: 2014-07-25
Filing date: 2014-07-25
Publication date: 2014-11-26
Anticipated expiration: 2024-07-25

Abstract

A kind of locking device, this locking device comprises: annular fastener, axial one end of fastening piece has the extension part extending radially outward; Axle, one end end surface has at least one first groove; Ring part, ring part comprises main body portion and the ring that is positioned at the axial one end of main body portion inner peripheral surface, the inner peripheral surface of interior ring is provided with at least one second groove; Key; In assembling final state, inner ring sleeve is on axle, fastening piece is fixedly set on axle, main body portion surrounds the fastening piece part that is not provided with extension part, fastening piece offsets with extension part axial relative one end and interior ring, one end of key is arranged in the first groove and the other end is arranged in the second groove, extension part and axially relative and fixing of main body portion.It is fastening that this programme can be realized better axle head, do not stretched out the axle head diameter outside pre-clamping of workpieces, the restriction of axial length, and, axial length large to axle head diameter hour, also can play locking fastening effect preferably.And, this programme locking device compact structure, easy to use.

Description

Anti-loosening device

Technical Field

The utility model relates to a locking technical field of machinery, in particular to locking device.

Background

In the current technical field of mechanical anti-loosening, one of two workpieces to be pre-tightened has a protruding shaft on the surface, one end of the shaft far away from the workpiece has a thread, and the other workpiece is tightly attached to the surface with the shaft after penetrating through the shaft. And screwing the nut on the shaft until the nut is tightly propped against the workpiece to be pre-tightened, and fastening the two workpieces together by the nut. In order to prevent the nut from loosening, a spring washer sleeved on the screw rod is generally arranged between the workpiece to be pre-tightened and the nut. The nut axially extrudes the spring washer, friction torque is generated between the spring washer and the nut, and the nut is prevented from rotating in the circumferential direction by means of the friction torque to play a role in preventing looseness.

When one end of a screw thread of the shaft extending out of the workpiece to be pre-tightened has a longer length or a smaller diameter, the existing anti-loosening scheme can achieve a better anti-loosening effect. However, when the diameter of the shaft end with the threads extending out of the workpiece to be pre-tightened is large and the axial length is small, the anti-loosening effect of the spring washer on the nut is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem is, to stretching out to treat that the outer axle head diameter that has the screw thread of pretension work piece is great, axial length is less, the spring washer is relatively poor to the locking effect of nut.

In order to solve the above problem, the utility model provides a locking device, this locking device includes:

an annular fastener having an extension extending radially outward at one axial end thereof;

a shaft having at least one first groove on one end surface;

the annular piece comprises a body part and an inner ring positioned on the inner circumferential surface of one axial end of the body part, and the inner circumferential surface of the inner ring is provided with at least one second groove;

a key;

in an assembly termination state, the inner ring is sleeved on the shaft, the fastener is fixedly sleeved on the shaft, the body portion surrounds a fastener portion without the extension portion, one end of the fastener, axially opposite to the extension portion, abuts against the inner ring, one end of the key is located in the first groove, the other end of the key is located in the second groove, and the extension portion is axially opposite to the body portion and is fixedly held.

Optionally, the fastener is a nut having internal threads;

the end surface of the shaft with the first groove is provided with an external thread;

the fastener and the shaft are screwed and fixed through the internal thread and the external thread.

Optionally, the inner circumferential surface of the end of the nut provided with the extension is hexagonal.

Optionally, the end face of the body part axially opposite to the extension part is provided with at least one groove;

in the assembled state, a portion of the extension axially opposite the groove is embedded in the groove.

Optionally, the extension is annular, and the groove is annular; or,

the number of the extending parts is equal to that of the grooves, the extending parts correspond to the grooves one to one, and in an assembling state, each extending part is embedded into one groove.

Optionally, the holding manner of the extension portion and the body portion includes: bolted, pinned or glued connections.

Optionally, the key is strip-shaped;

in the assembled state, the first and second slots are diametrically opposed, and both ends of the key in the radial direction are located in the first and second slots, respectively.

Optionally, the key comprises a front part, a rear part, and a middle part between the front part and the rear part, the front part and the rear part extend along two opposite directions of a straight line direction relative to the middle part, and the middle part and the front part and the rear part respectively have an included angle larger than 0;

in the assembled state, the front portion is located in the first slot, the intermediate portion abuts a surface of the first slot axially facing the fastener, and the rear portion is located in the second slot.

Compared with the prior art, the technical scheme of the utility model have following advantage:

the first groove, the second groove and the key realize circumferential limiting of the annular piece, and when the annular piece has a circumferential rotating trend, the key applies torque opposite to the rotating trend to the annular piece due to the fact that the key is located in the first groove on the shaft, so that the annular piece cannot rotate circumferentially. And the annular piece is fixedly held with the extending part of the fastener, so that the circumferential limit of the fastener is realized. Namely, after assembly, the fastener can not rotate circumferentially relative to the shaft easily, and can prevent the pre-tightened workpiece from rotating, so that the workpiece is fastened. Compared with the prior art, the technical scheme can realize better shaft end fastening, is not limited by the diameter and the axial length of the shaft end extending out of the pre-tightening workpiece, and can also play a better anti-loosening fastening effect when the diameter and the axial length of the shaft end are larger. Moreover, the anti-loosening device is compact in structure and convenient to use.

Drawings

Fig. 1 is a schematic sectional view of a locking device according to an embodiment of the present invention along an axial direction of a shaft;

fig. 2 is a perspective view of a key for connecting a ring member and a shaft in a locking device according to another embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 1, the shaft-end fastening locking device of the present embodiment includes:

the annular fastener 1 is provided with an extension part 10 extending outwards in the radial direction at one axial end of the fastener 1, and the extension part 10 is of an annular structure;

a shaft 2 having at least one first groove 20 in an end surface thereof, the plurality of first grooves 20 being spaced apart in a circumferential direction when the number of first grooves 20 is at least two;

the annular part 3, the annular part 3 includes the body 31 and inner ring 32 located in the inner circumferential surface of one axial end of the body 31, the inner circumferential surface of the inner ring 32 has at least one second groove 320, when the number of the second grooves 320 is at least two, the plurality of second grooves 320 are distributed at intervals along the circumferential direction;

and a key 4.

The ring-shaped element 3 can be circumferentially limited relative to the shaft 2 by means of the key 4;

in the assembled end state, the inner ring 32 is fitted over the shaft 2, and one end of the key 4 is located in the first groove 20 and the other end is located in the second groove 320. The fastener 1 is fixedly sleeved on the shaft 2, the body part 31 surrounds the part of the fastener without the extension part 10, one end of the fastener 1 axially opposite to the extension part 10 is abutted against one end surface of the inner ring 32, and the other end surface of the inner ring 32 is axially abutted against the workpiece 5 to be pre-tightened. Wherein the extension 10 is axially opposite and retained to the body 31. When it is necessary to remove the workpiece 5, the extension 10 is forcibly separated from the body portion 31 of the ring 3, and the fastener 1 is separated from the shaft 2.

It should be noted that the dotted line in fig. 1 indicates the boundary of the inner circumferential surface of the inner ring 32 of the annular member 3, which is not visible due to the blocking of the key 4 and is indicated by the dotted line.

With the solution of the present embodiment, the first groove 20, the second groove 320 and the key 4 realize circumferential limitation of the ring-shaped member 3, and when the ring-shaped member 3 has a tendency to rotate circumferentially, because the key 4 is located in the first groove 20 on the shaft 2, the key 4 applies a torque to the ring-shaped member 3 opposite to the rotation tendency, so that the ring-shaped member 3 cannot rotate circumferentially. And because the annular part 3 is fixed with the extending part 10 of the fastener 1, the circumferential limit of the fastener 1 is realized. That is, after assembly, the fastener 1 cannot easily rotate circumferentially relative to the shaft 2, and can prevent the pre-tightening workpiece 5 from rotating, thereby realizing the fastening of the workpiece 5. Compared with the prior art, better axle head fastening can be realized to this embodiment scheme, does not receive the restriction of axle head diameter size, axial length outside stretching out the pretension work piece, and when the axle head diameter is great, axial length is less, also can play better locking fastening effect. Moreover, the anti-loosening device is compact in structure and convenient to use.

In addition, in the assembled state, the inner ring 32 of the annular member 3 is axially abutted against the workpiece 5, and the inner ring 32 can axially seal the workpiece 5. The inner circumferential surface of the inner ring 32 is radially sealed with the shaft 2, for example, without a gap, and the size of the key 4 in the circumferential direction is just equal to or slightly larger than the size of the first groove 20 and the second groove 320 in the circumferential direction, and the inner ring 32 can radially seal the workpiece 5.

In a particular embodiment, in the assembled state, it may be: the first groove 20 is opposite to the second groove 320 in the radial direction, the key 4 is in a strip shape, and two ends in the radial direction are respectively abutted against the bottom of the first groove 20 and the bottom of the second groove 320. As a modification, it is also possible to: referring to fig. 2 in combination, the key 4 includes a front portion 41, a rear portion 42, and an intermediate portion 43 between the front portion 41 and the rear portion 42, the front portion 41 and the rear portion 42 extending in opposite directions of a straight line direction with respect to the intermediate portion 43, the intermediate portion 43 having an angle greater than 0 with respect to each of the front portion 41 and the rear portion 42. In the assembled state, the first groove 20 is axially offset from the second groove 320, the front portion 41 is located in the first groove 20, the intermediate portion 43 abuts the surface of the first groove 20 facing the fastener 1 in the axial direction, and the rear portion 42 is located in the second groove 320.

For ease of assembly, the first groove 20 penetrates the end face of the shaft 2 in the axial direction, and the second groove 320 penetrates at least the end face of the inner ring 2 facing axially away from the fastening element 1 in the axial direction. During assembly, the key 4 is first placed in the first groove 20, and then the ring member 3 is fitted in the axial direction of the shaft 2 until the key 4 is located in the second groove 320. When the fastener 1 is sleeved in the axial direction, the fastener 1 has an axial pre-tightening effect on the key 4, and the key 4 is prevented from loosening.

In the present embodiment, the fastener 1 is a nut having an internal thread (not shown in the drawings); the end surface of the shaft 2 having the first groove has an external thread (not shown in the drawings); the fastener 1 is screwed and fixed with the shaft 2 through internal threads and external threads. Wherein the inner circumferential surface of the end of the nut provided with the extension 10 is formed in a hexagonal shape to facilitate screwing of the nut. In addition to a threaded connection, the fastening element 1 can also be fixed to the shaft 2 in other ways, for example by means of a strong glue, but this does not facilitate the removal of the shaft 2 from the fastening element 1.

In the present embodiment, the end surface of the main body 31 axially opposite to the extending portion 10 has at least one groove 310, and when the number of the grooves 310 is multiple, the multiple grooves 310 are distributed at intervals along the circumferential direction;

during assembly, the axially opposite portions of the extension 10 and the groove 310 are knocked by external force to form a protrusion, and the protrusion is embedded in the groove 310 to realize the holding of the extension 10 and the body 31. The two side walls of the groove 310 in the circumferential direction circumferentially limit the extending portion 10, and therefore circumferential limiting of the fastener 1 is achieved. In the present embodiment, the groove 310 penetrates the body portion 31 in the radial direction. As a modification, the groove 310 may not penetrate the body portion 31.

In a particular embodiment, the extension 10 is thin, enabling knock-in into the recess 310. The extension 10 is annular; alternatively, the number of extensions 10 is equal to the number of grooves 310, said extensions 10 corresponding one-to-one to the grooves 310, each extension 10 being embedded in one groove 310 in the assembled state.

Besides the holding manner of the present embodiment, the holding manner of the extension portion 10 and the body portion 31 may be: bolted, pinned or glued connections. Taking the adhesive connection as an example, when the fastener 1 is sleeved, the extension portion 10 and the body portion 31 are axially attached, and strong glue is coated between the attachment surfaces, and the two are fixed by the strong glue.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A check device, comprising:

a shaft having at least one first groove on one end surface;

a key;

2. The anti-loosening apparatus of claim 1, wherein the fastener is a nut having internal threads;

3. The anti-loosening device as defined in claim 2, wherein the inner circumferential surface of the end portion of the nut at which the extension is provided is formed in an inside hexagonal shape.

4. The anti-loosening device as claimed in any one of claims 1 to 3, wherein the body portion has at least one groove in an end surface thereof axially opposite to the extension portion;

5. The anti-loosening device of claim 4, wherein the extension is annular and the groove is annular; or,

6. The anti-loosening device of claim 1, wherein the extension and the body are retained by a retaining means comprising: bolted, pinned or glued connections.

7. The anti-loosening device of claim 1, wherein the key has a bar shape;

8. The anti-loosening apparatus of claim 1, wherein the key comprises a front portion, a rear portion, and an intermediate portion between the front and rear portions, the front and rear portions extending in opposite directions of a linear direction with respect to the intermediate portion, the intermediate portion having an angle greater than 0 with respect to each of the front and rear portions;