JPH08145035A - Lock nut rotation prevention structure - Google Patents

Abstract

(57) [Summary] [Purpose] The light and compact ring body securely prevents the lock nut from loosening without the risk of falling off due to vibration or impact. [Structure] Through hole 8a of the lock nut 8 in the ring body 22
A locking claw 23 that locks to the lock nut 8 and a fitting claw 24 that fits in the fitting groove 7a of the carrier 7 are provided to prevent the ring body 22 from falling off the lock nut 8 and to apply a force in the loosening direction to the lock nut 8. When the lock is generated, the locking claw 2 for the through hole 8a
The locking portion 3 of the ring 3 and the fitting portion of the fitting claw 24 with respect to the fitting groove 7a bear a force in the loosening direction, so that the ring main body 22 can be easily attached to the lock nut 8 by the locking claw 23. The lock nut 8 is prevented from falling off from the lock nut 8 and the lock nut 8 is prevented from loosening, and the lock nut 8 is loosened in a state in which there is no fear that the light and compact ring body 22 will fall off against vibration or impact force Surely prevent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock nut locking structure for locking a lock nut used for bearing holding, for example.

[0002]

2. Description of the Related Art The structure of an automobile differential is shown in FIG.
It will be described based on. FIG. 7 shows a cross section of the differential. As shown in the drawing, a drive gear 2 meshes with the drive pinion 1, and the drive gear 2 is fixed to a differential case 3. A pinion gear 4 and a side gear 5 are housed in the differential case 3, the side gear 5 is attached to an end of a drive shaft (not shown), and a drive shaft (not shown) is supported in the differential case 3.
The differential case 3 is rotatably supported by a carrier 7 via a side bearing 6, and the side bearing 6 has a thrust nut of the outer ring 6a regulated by a lock nut 8 screwed onto the carrier 7. Lock nut 8
The through hole 8a provided in the plate surface is used to adjust the screwing state with respect to the carrier 7, and the position of the outer ring 6a of the side bearing 6 is regulated by adjusting the screwing state of the lock nut 8. As a result, the preload of the side bearing 6 is adjusted, and the lock nut 8 is fixed by the snap ring 9 to the carrier 7 and fixed in a predetermined preload state.

A conventional locking structure for a lock nut will be described with reference to FIGS. 8 and 9 (Japanese Patent Application No. 62-182643). 8 shows the VIII arrow in FIG. 7, and FIG. 9 shows the perspective state of FIG. As shown in the figure, the snap ring 9 has a ring shape with a part cut away and is biased in the radial direction. A fitting claw 10 that fits into the fitting groove 7a of the carrier 7 is provided on a part of the outer peripheral surface located in the middle of the snap ring 9.
Snap rings 9 are provided on the inner peripheral surfaces on both sides of the fitting claw 10.
The first claws 11 bent at a right angle to the plate surface are provided symmetrically. Further, second claws 12 are symmetrically provided on the inner peripheral surface of the intermediate portion of the snap ring 9, and the second claws 12 are formed in a U-shape to lock the nut 8.
The inner peripheral surface is engaged with the rear surface side.

In the conventional lock nut rotation preventing structure in which the lock nut 8 is prevented from rotating by the snap ring 9, first, the fitting claw 10 is engaged with the fitting groove 7a of the carrier 7,
Next, the snap ring 9 is deformed in the diameter reducing direction against the biasing force and pressed against the lock nut 8. Thereby, the first
The claw 11 engages with the through hole 8a of the lock nut 8, and the second claw 12 engages with the inner peripheral edge of the lock nut 8. Then, the urging force of the snap ring 9 in the radial direction causes the second claw 12 to engage with the lock nut 8 from the inner peripheral surface to the rear surface side, and the first claw 11 prevents the lock nut 8 from loosening. Is done and the second nail 12
This prevents the snap ring 9 from falling off the lock nut 8. Therefore, the mounting can be performed with one touch, and there is no fear of falling off due to vibration or impact force, and the lock nut 8 can be reliably prevented from loosening.

[0005]

In the above-described conventional lock nut rotation preventing structure, the snap ring 9 can be easily attached, but the snap ring 9 has the first structure for preventing the lock nut 8 from loosening. Since the claw 11 and the second claw 12 for preventing the claw 11 from falling off are provided, the snap ring 9 needs to have a diameter similar to that of the lock nut 8. For this reason, the snap ring 9 is increased in size and weight, resulting in increased material cost and difficulty in handling. Further, since the second claw 12 is formed in a U-shape and the tip thereof is bent inward by 180 degrees, the processing is complicated, the manufacturing is troublesome, and the cost is high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lock nut rotation preventing structure capable of reliably preventing the lock nut from being loosened by a lightweight and compact ring body.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention is such that a plurality of through holes are screwed into the main body for restricting a member supported by the main body and a plurality of through holes are formed in the plate surface. In a lock stop structure for a lock nut having, a fitting groove formed in the main body at a portion where the lock nut is screwed, a ring main body which is substantially semicircular and elastically deformable in a radial direction, and both ends of the ring main body A locking claw that is provided in the vicinity of each of the locking claws and is locked in the through hole and has a tip end bent outward of the lock nut, and is provided in a substantially intermediate portion of the ring body between the locking claws. It is characterized by comprising a fitting claw fitted in the fitting groove.

The fitting claw is offset to the tightening direction side of the lock nut and is provided on the ring body. Further, in the fitting claw, a line segment connecting a fitting part of the fitting claw to the fitting groove and a fitting part of the locking claw to the through hole is outside the inner diameter of the ring body. The lock nut is provided in the ring body while being offset toward the tightening direction of the lock nut. Further, a line segment connecting a fitting portion of the fitting claw to the fitting groove and a fitting portion of the locking claw to the through hole is located on the ring body. To do. Further, the ring main body is urged in the radial direction when the fitting claw is fitted in the fitting groove and the locking claw is locked in the through hole. Further, the fitting claw is provided in the ring body by being bent so as to be a polygonal line substantially parallel to a tangent line of the lock nut when the ring body is mounted on the lock nut. Characterize. Further, the locking claw is provided on the ring body by being bent by a fold line substantially orthogonal to a line segment connecting the two through holes with which the locking claw is locked. .

[0009]

[Function] The fitting claw is fitted in the fitting groove of the main body, and the locking claw is locked in the through hole of the lock nut. Since the locking claw is bent to the outer side of the lock nut, the locking claw prevents the ring body from coming off the lock nut. If a force is applied to the lock nut in the loosening direction, the force in the loosening direction is received between the engaging part of the engaging claw with respect to the through hole and the engaging part of the engaging claw with respect to the fitting groove, and The nut does not loosen.

Further, the fitting claw is offset to the tightening side of the lock nut, and the line segment connecting the fitting part of the fitting claw and the locking part of the locking claw is located outside the inner diameter of the ring body on the ring body. Since the lock nut is located at the position, even if a force in the loosening direction is generated in the lock nut, the force in the loosening direction is covered by the rigidity of the ring body. Further, since the broken line of the fitting claw is substantially parallel to the tangent line of the lock nut, the fitting claw abuts the fitting groove at the corner. Further, since the bent line of the locking claw is substantially orthogonal to the line segment connecting the two through holes with which the locking claw locks, the locking of the locking claw in the through hole is ensured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a rotation preventing structure of a lock nut according to an embodiment of the present invention, FIG. 2 is a perspective view of FIG.
Shows the front of the ring body. 1 corresponds to FIG. 8 of the related art, and FIG. 2 corresponds to FIG. 9 of the related art, and the same members as those of the related art are denoted by the same reference numerals and duplicate description is omitted. That is, the embodiment shown below is the outer ring of the side bearing 6 which is a member supported by the carrier 7 as the main body.
It is applied to the rotation stop of the lock nut 8 that regulates 6a (see FIG. 7), and the lock nut 8 is fixed to the carrier 7 by being stopped from rotation by the snap ring 21, and the side bearing 6 is fixed to a predetermined preload state. To be done.

As shown in FIGS. 1 and 2, the snap ring 21 has a ring body 22 having a substantially semicircular shape, and the ring body 22 is urged in the radial direction. Ring body 22
Locking claws 23 are provided on the outer periphery near both ends of
The tip 23a of the locking claw 23 is bent outward of the lock nut 8 and locked in the through hole 8a. A fitting claw 24 is provided on the outer periphery of the substantially intermediate portion of the ring main body 22 between the locking claws 23, and the fitting claw 24 is adapted to be fitted into the fitting groove 7 a of the carrier 7.

The fitting claw 24 is fitted in the fitting groove 7a of the carrier 7, and is deformed in the diameter reducing direction against the biasing force of the ring body 22 and pressed against the lock nut 8. As a result, the locking claw 2
3 is inserted into the through hole 8a and the locking claw 23 is inserted into the through hole 8a.
Since the tip 23a of the locking claw 23 is bent outwardly of the lock nut 8, the ring body 22 is prevented from falling off. When a rotational force in the loosening direction is generated in the lock nut 8 (direction of arrow A in FIG. 1), the fitting claw 2
4 contacts the point a of the fitting groove 7a, and the locking claw 23 contacts the point b of the through hole 8a, so that the rotation of the lock nut 8 is blocked and the rotational position is fixed.

A snap ring 2 according to FIGS.
1 will be described in detail. FIG. 4 shows an enlarged state of the main part in FIG.
FIG. 5 shows how the fitting claw 24 is attached.

As shown in the drawing, the fitting claw 24 of the snap ring 21 is on the locking direction side of the lock nut 8 (right side in the drawing).
It is provided on the ring body 22 while being offset.
That is, a line segment B (see FIG. 5) that connects the point a, which is the fitting portion of the fitting claw 24 to the fitting groove 7a, and the point b, which is the fitting portion of the locking claw 23 to the through hole 8a. The fitting claw 24 is provided on the ring body 22 in a state where it is located outside the inner diameter of the ring body 22 and the line segment B is located on the ring body 22. Therefore, the fitting claw 24 can be provided in a range from the position shown by the solid line in FIG. 5 to the position shown by the chain double-dashed line. When the lock nut 8 rotates in the loosening direction by providing the fitting claw 24 so that the line segment B is located outside the inner diameter of the ring body 22 and on the ring body 22, as shown in FIG.
As indicated by the dotted line in Fig. 3, it is possible to obtain a large reaction force in the same manner as the plate C is responsible for the compressive force between the points a and b. Therefore, it is possible to reliably prevent the lock nut 8 from rotating in the loosening direction. In the above embodiment, the case where the line segment B is located on the ring body 22 has been described, but the present application is not limited to this, and the line segment B may be located outside the inner diameter of the ring body 22. For example, it is possible to obtain a reaction force that prevents the lock nut 8 from rotating in the loosening direction.

The bending line of the bent portion of the fitting claw 24 is formed so as to be substantially parallel to the tangent line D (see FIG. 4) of the lock nut 8 when the snap ring 21 is mounted on the lock nut 8. Has been done. Since the bent line of the fitting claw 24 is made substantially parallel to the tangent line D of the lock nut 8, the corner portion of the fitting claw 24 is always in contact with the fitting groove 7a, and sufficient strength can be ensured. . Also, the locking claw 23
The tip 23a is bent to the outside of the lock nut 8 by a polygonal line that is substantially orthogonal to a line segment E (see FIG. 4) connecting the centers of the two through holes 8a in which the locking claws 23 are locked. ing. For this reason, the engagement of the locking claw 23 with the through hole 8a is ensured, and there is no fear of falling off due to vibration or impact force.

According to the above-described lock nut detent structure, the locking claw 23 of the snap ring 21 prevents the ring body 22 from falling off the lock nut 8, and the fitting claw 24 and the locking claw 23 prevent the lock nut from falling off. The rotation in the loosening direction of 8 can be reliably fixed. For this reason, it becomes possible to prevent the lock nut 8 from loosening despite the size reduction of the snap ring 21.

The lock nut rotation preventing structure described above is
Although the lock nut 8 having the shape in which the outer circumference is screwed into the inner circumference of the carrier 7 has been described, the snap ring 21 is similarly used for the lock nut of the lock nut whose inner circumference is screwed into the fixed member. Can be applied. That is, FIG.
In the case of a structure in which the lock nut 32 is screwed onto the outer circumference of the shaft 31, as shown in FIG.
And the fitting claw 24 of the snap ring 21 is provided in the fitting groove 31a.
And the locking claw 23 of the snap ring 21 is locked in the through hole 32a of the lock nut 32. Thus, the rotation of the lock nut 32 in the loosening direction can be reliably fixed without dropping the snap ring 21 due to vibration or impact force, just as when the rotation of the lock nut 8 is stopped.

[0019]

According to the lock nut rotation preventing structure of the present invention, by locking the locking claw in the through hole of the lock nut, it is possible to prevent the ring body from falling off from the lock nut, and at the same time, to lock the lock nut. When a force in the loosening direction is generated in the ring, the force in the loosening direction can be shared between the engaging portion of the engaging claw with respect to the through hole and the engaging portion of the engaging claw with respect to the fitting groove. The main body can be easily attached to the lock nut, and the locking claw can prevent the ring main body from falling off the lock nut and prevent the lock nut from loosening. As a result, the ring body can be downsized, and it is possible to reliably prevent the lock nut from loosening while preventing the ring body from falling off due to vibration and impact force due to the lightweight and compact ring body, Processing becomes easy, and it becomes possible to facilitate handling and reduce costs.

Further, the fitting claw is offset to the tightening side of the lock nut, and the line segment connecting the fitting part of the fitting claw and the locking part of the locking claw is outside the inner diameter of the ring body on the ring body. Since the lock nut is located at the position, even if a force in the loosening direction is generated in the lock nut, the force in the loosening direction is covered by the rigidity of the ring body. Further, since the broken line of the fitting claw is substantially parallel to the tangent line of the lock nut, the fitting claw abuts the fitting groove at the corner. Further, since the bent line of the locking claw is substantially orthogonal to the line segment connecting the two through holes with which the locking claw locks, the locking of the locking claw in the through hole is ensured.

[Brief description of drawings]

FIG. 1 is a front view showing a rotation preventing structure for a lock nut according to an embodiment of the present invention.

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a front view of a ring body.

FIG. 4 is an enlarged view of a main part in FIG.

FIG. 5 is an explanatory view of a mounting claw attachment state.

FIG. 6 is a front view showing a rotation preventing structure for a lock nut according to another embodiment of the present invention.

FIG. 7 is a sectional view of a differential.

FIG. 8 is a view on arrow VIII in FIG. 7.

9 is a perspective view of FIG.

[Explanation of symbols]

 7 Carrier 7a Fitting groove 8 Lock nut 8a Through hole 21 Snap ring 22 Ring body 23 Locking claw 23a Tip 24 Fitting claw

Claims (7)

[Claims] 1. In a lock-stop structure for a lock nut, which is screwed to the main body to regulate a member supported by the main body and has a plurality of through holes in a plate surface, a portion to which the lock nut is screwed. The fitting groove formed in the main body, the ring main body having a substantially semi-circular shape and elastically deformable in the radial direction, the ring main body being provided in the vicinity of both ends of the ring main body, being locked in the through hole, It comprises a locking claw bent outward of the lock nut, and a fitting claw provided in a substantially intermediate portion of the ring body between the locking claws and fitted into the fitting groove. Characteristic lock nut rotation prevention structure. 2. The lock nut rotation preventing structure according to claim 1, wherein the fitting claw is provided on the ring body by being offset toward the tightening direction side of the lock nut. 3. The inner diameter of the ring main body of the fitting claw is a line segment connecting a fitting part of the fitting claw to the fitting groove and a fitting part of the locking claw to the through hole. 2. The ring body is offset to the tightening direction side of the lock nut and is provided on the ring main body in a state of being located on the outer side of the ring nut.
Alternatively, the rotation preventing structure for the lock nut according to claim 2. 4. A line segment connecting a fitting portion of the fitting claw to the fitting groove and a fitting portion of the locking claw to the through hole is located on the ring body. 4. The method according to claim 3,
Lock nut rotation prevention structure described in. 5. The ring body is urged in a radial direction when the fitting claw is fitted in the fitting groove and the locking claw is locked in the through hole. Claim 1
Lock nut rotation prevention structure described in. 6. The fitting claw is provided in the ring body by being bent in a state that when the ring body is attached to the lock nut, the fitting claw becomes a polygonal line substantially parallel to a tangent line of the lock nut. The lock stop structure for a lock nut according to claim 1, wherein 7. The locking claw is provided on the ring body by being bent by a fold line that is substantially orthogonal to a line segment that connects the two through holes with which the locking claw is locked. The locking structure for a lock nut according to claim 1, which is characterized in that.