JPH066274Y2 - Lock structure of lock nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Technical Field of the Invention) The present invention relates to a lock structure of a lock nut for preventing loosening of a lock nut screwed into a screw hole.

(Prior Art) A lock structure of a lock nut used for a differential portion of an automobile is generally configured as shown in FIGS. 3 and 4. That is, 1 is a differential main body, which is provided with a screw hole 2 and an engaging groove 3 is formed in a part of the inner peripheral surface of the screw hole 2 in the axial direction of the screw hole 2. There is. A lock nut 4 is screwed into the screw hole 2. The lock nut 4 has a ring shape in which a screw portion 5 is engraved on the outer peripheral surface, and two fixing holes 6, 6 are symmetrically provided on the plate surface.

Reference numeral 7 denotes a lock plate, which has a ring shape, an engaging projection 8 for engaging with the engaging groove 3 is provided on a part of an outer peripheral surface thereof, and a plurality of through holes 9 ... Are provided at predetermined intervals.

Then, as a means for preventing the lock nut 4 screwed into the screw hole 2 from loosening, the engaging projection 8 of the lock plate 7 is engaged with the engaging groove 3 of the main body 1. In this state, the lock plate 7 is joined to the lock nut 4, and the two through holes 9 and 9 corresponding to the fixing holes 6 and 6 of the lock nut 4 have bolts 10 and
10 and insert the bolts 10 and 10 into the fixing holes 6 and
The lock nut 4 and the lock plate 7 are integrated by being screwed into the lock plate 6.

By thus integrating the lock nut 4 and the lock plate 7, the lock plate 7 is prevented from rotating with respect to the main body 1 by the engagement between the engagement groove 3 and the engagement protrusion 8. It is possible to prevent the nut 4 from loosening.

(Problems to be solved by the invention) However, since the lock plate 7 is fixed to the lock nut 4 by the bolts 10 and 10 as described above, when the bolts 10 and 10 are loosened due to the vibration of the vehicle body, the lock plate 7 is locked. The plate 7 may come off and the lock nut 4 may loosen, and the workability of tightening the bolts 10 and 10 is poor.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a lock structure of a lock nut that can be securely locked without being tightened by a bolt or loosened by vibration. Especially.

[Structure of the Invention] (Means and Actions for Solving Problems) This invention provides a plurality of through holes on the plate surface of a lock nut, and a spring action in a radial direction in the form of a ring with a part cut away. The engaging convex portion is provided on a part of the outer peripheral surface of the snap ring having the groove, the first pawl and the second pawl are provided on the inner peripheral surface, and the engaging convex portion is provided on the inner peripheral surface of the screw hole. While engaging with the engaging groove, the first claw is engaged with the through hole,
Further, the second claw is engaged with the inner peripheral edge of the lock nut to elastically engage the lock nut and the snap ring, thereby preventing the lock nut from loosening.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, but the same components as those of the related art will be denoted by the same reference numerals and description thereof will be omitted. Lock nut 4 as shown in FIG.
A plurality of through holes 11 ... Are bored at predetermined intervals on the plate surface. Reference numeral 12 denotes a snap ring, which has a ring shape with a part cut away, and has a spring action in the radial direction. That is, the snap ring 12 has an elastic force so as to spread laterally around the middle portion, and the engaging convex portion 13 is provided on a part of the outer peripheral surface located at the middle portion. Further, the first claws 14, 14 are symmetrically provided on the inner peripheral surface in the upper portion of the snap ring 12, and are bent at right angles to the plate surface of the snap ring 12. Further, second claws 15 and 15 are provided symmetrically on the inner peripheral surface of the snap ring 12 in the middle portion. The second claws 15 and 15 are formed in a U shape so that they can be engaged from the inner peripheral surface of the lock nut 4 to the rear surface side.

When locking the lock nut 4 to prevent it from loosening by the snap ring 12 configured as described above, first, the engagement protrusion 13 of the snap ring 12 is engaged with the engagement groove 3 of the main body 1. Next, by pressing the snap ring 12 against the lock nut 4 while elastically deforming the snap ring 12 against the spring action force,
The claws 14, 14 engage with the through holes 11, 11 of the lock nut 4, and the second claws 15, 15 engage with the inner peripheral edge of the lock nut 4. That is, in the snap ring 12, the second pawls 15 and 15 are engaged with the lock nut 4 by the elastic restoring force in the radial expansion direction, so that the snap ring 12 can be attached with one touch, and the snap ring 12 can be detached against vibration and impact force. No worries. Therefore, the lock nut 4 can be prevented from loosening.

[Effect of the Invention] As described above, according to the present invention, by providing the snap ring with the claw that engages with the lock nut and elastically engaging the snap ring, the snap ring can be mounted with one touch without using a bolt. The lock nut 4 can be prevented from being loosened without being worried about falling off due to vibration or impact force.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view of a mounted state, FIG. 2 is a perspective view of a snap ring, and FIG. 3 is a front view of a conventional mounted state. FIG. 4 is an exploded perspective view of a conventional lock nut and lock plate. DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Screw hole, 3 ... Engagement groove, 4 ... Lock nut, 5 ... Screw part, 11 ... Through hole, 12 ... Snap ring, 13 ... Engagement convex part, 14 ... First claw, 15 ... second nail.

Claims (1)

[Scope of utility model registration request] 1. A lock structure for a lock nut, wherein an engagement groove is provided in a part of an inner peripheral surface of the screw hole, and a ring-shaped lock nut having a screw portion on the outer peripheral surface is screwed into the screw hole. While providing a plurality of through holes on the plate surface of the lock nut,
A ring-shaped snap ring, which is cut apart, has a spring action in the radial direction and is joined to the lock nut, and the snap ring engages the engaging groove with the engaging groove and the through hole. A lock structure for a lock nut, comprising: a first claw to be engaged with and a second claw to be engaged with an inner peripheral edge of the lock nut.