JP2963656B2 - Stopper fastening structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a stop member for restricting relative movement of a mounting member mounted on a shaft member so as to be relatively movable in the axial direction.

[0002]

2. Description of the Related Art Generally, when a mounting member is mounted on a shaft member so as to be relatively movable in the axial direction, the mounting member is moved to limit the range of movement of the mounting member or to prevent the mounting member from coming off the shaft member. In some cases, a stop member for regulating is fixed to the shaft member. Conventionally, as such a stopping member, as shown in FIG. 6 (X), a fixing member using a nut 10 is used, or as shown in FIG. 6 (Y) shown in JP-A-7-251657. , C-shaped retaining ring 1
1 and the like are known.

[0003]

However, in the former case, a screw shaft portion 4b for screwing a nut having a diameter smaller than that of the shaft member 4 must be formed on the shaft member 4, so that a complicated screw cutting operation is required. However, if the diameter of the shaft member 4 itself is small, there is a problem that the screw cutting operation is difficult. In the latter case, first, a stopper member 12 is fitted into a small-diameter portion 4c formed on the shaft member 4, and then a stopper ring 11 is fixed to a concave groove 4d formed on the small-diameter portion 4c. The cover member 12 of the stopper member 12 is moved by moving the member 12 to the stop ring 11 side.
a covers the stop ring 11, so that the gap S is equivalent to the stroke for moving the stopper member 12.
This causes a problem that the stopper member 12 rattles and generates abnormal noise, and there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made to solve these problems, and is mounted on a shaft member so as to be relatively movable in the axial direction. In restricting the movement of the mounting member by using a stopper member fixed to the shaft member, an engagement concave groove is provided on the outer periphery of the shaft member, and the stopper member is a ring capable of fitting the shaft member on the inner periphery. A groove-shaped portion which is set to have a shape and is formed by folding back in the axial direction of the shaft member is formed on the stopper member in which the shaft member is fitted. the stop member inner peripheral portion by forming to be smaller than the outer diameter of the insertion and engaged with configuration that fastened to the engaging recessed groove
At the same time, the stopper member is movably externally fitted to the shaft member.
Integrated into the stopper member
A guide groove is formed on the topper member to form a groove.
What is kicked is characterized in. With this, the stop member simply forms a groove-shaped portion facing the axial direction of the shaft member so that the inner diameter of the stop member is smaller than the outer diameter of the shaft member, and the inner peripheral portion of the stop member is inserted into the shaft member engaging groove. The locking member is fixed to the shaft member, so that the fixing member can be easily and securely fixed to the shaft member, and the groove-shaped portion is formed.
Is more easily formed . In this configuration, the setting is such that the groove-shaped portion is not inserted into the engagement groove by notching the inner peripheral edge of the portion where the groove-shaped portion of the stopper member is formed in a concave shape toward the outer radial direction. it can.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a driver seat provided in a vehicle such as a passenger car or a truck.
The seat 1 is attached to the vehicle body so as to be movable in the front-rear direction.

That is, a movable bracket 2 is integrally provided on the bottom surface of the seat 1, and an electric motor 3 is attached to a front portion of the movable bracket 2. Reference numeral 4 denotes a pair of left and right screw shafts which are supported by the movable bracket 2 so as to be rotatable around the axis, and which are directed in the front-rear direction. The screw shaft 4 is linked to the output shaft so that the screw shaft 4 is rotated forward and backward in a decelerated state with the forward and reverse driving of the electric motor 3.

Reference numeral 6 denotes a pair of right and left nut members screwed to the screw shaft 4. The nut member 6 is pivotally moved in the direction around the axis by a fixing bracket 7 integrally provided on the vehicle body side. It is fixed in a regulated state. When the screw shaft 4 rotates forward and backward around the axis based on the forward and reverse driving of the electric motor 3, the screw shaft 4 moves in the front-rear direction with respect to the nut member 6. Move in the front-rear direction with respect to the vehicle body.

On the other hand, reference numeral 8 denotes a stopper member which is fixed at an appropriate position at both front and rear ends of the screw shaft 4. The stopper member 8 comes into contact with the nut member 6 when the screw shaft 4 moves forward and backward. The stopper member 8 is fixed to the screw shaft 4 by a stopper plate 9 fixed to the screw shaft 4.

The stop plate 9 has an engagement hole 9 at the center.
a, the inner diameter of the engagement hole 9a is substantially equal to or slightly equal to the outer diameter of the screw shaft 4 at a stage before forming a groove portion 9d described later. It is set large so that the screw shaft 4 can be fitted into the engagement hole 9a. The outer peripheral edge of the stopper plate 9 is notched with a plurality of outer peripheral recesses 9b at appropriate intervals in the circumferential direction.
In the present embodiment, there are provided four places at intervals of 90 degrees around the axis of the stop plate 9, and these will be described below. Here, in the inner peripheral edge portion of the engagement hole 9a, an inner peripheral side concave portion 9c is cut out at a portion located on the same diameter line A as the four outer peripheral side concave portions 9b.

On the other hand, the stopper member 8 has a bottom portion 8a.
And a cylindrical shape with a bottom having a cylindrical portion 8b,
At the center of the bottom surface 8a, an insertion hole 8c having a size that allows the screw shaft 4 to be inserted is formed. The cylindrical portion 8b is set to have a size that allows the stop plate 9 to be fitted inside the cylinder. Further, at the opening side (opposite to the bottom surface 8a) edge of the stopper member 8, a locking projection 8d protruding toward the inner diameter side is provided with a stopper member corresponding to the outer peripheral side recess 9b of the stop plate 9. 8 are provided at four locations around the axis at intervals of 90 degrees. Further, on the inner surface of the cylinder of the bottom surface portion 8a, a portion located between the locking protrusions 8d adjacent to each other in the circumferential direction (the locking protrusion in the present embodiment). 8d to stopper member 8
(A portion deviated by 45 degrees about the axis of the shaft) is formed with a guide groove 8e that faces in the radial direction.

On the other hand, on the outer peripheral portion of the screw shaft 4, an annular engaging groove 4a is provided at a position where the stopper plate 9 is fixed, and a groove width B1 of the engaging groove 4a is provided. Is set to be slightly larger than the plate thickness B2 of the stop plate 9, and when a groove-like portion 9d is formed in the stop plate 9 as described later, the inner peripheral edge of the stop plate engaging hole 9a is engaged with the screw shaft. The groove is inserted into the groove 4a without play.

When fixing the stopper member 8 to the screw shaft 4, first, the outer peripheral side recess 9b of the stopper plate 9 is formed.
The stopper plate 9 is fitted into the stopper member cylindrical portion 8b in a state where the stopper plate 9 is aligned with the locking projection 8d of the stopper member 8, and then the stopper plate 9 is rotated 45 degrees around the axis. In this rotated state, the diameter line A connecting the outer peripheral side concave portion 9b and the inner peripheral side concave portion 9c of the stopper plate 9 is located on the guide groove 8e of the stopper member 8, and the stopper member engaging convex portion 8d is engaged with the outer peripheral edge of the stop plate 9, and the stopper member 8 of the stop plate 9
Has been prevented from coming off. Here, the distance B3 between the bottom surface 8a of the stopper member 8 and the locking projection 8d is set to be substantially equal to or slightly larger than the plate thickness B2 of the stopper plate 9, and is fitted into the stopper member 8. The stop plate 9 does not rattle.

Next, although the stopper plate 9 is fitted into the stopper member 8 and rotated, the stopper member bottom surface 8a is inserted into the engaging hole 9a and the fitting hole 8c at the center of the screw shaft 4 (the nut member 6 is The screw shaft 4 is fitted so as to be positioned on the side of the screw shaft, and the positioning is performed such that the inner peripheral edge of the stopper plate engaging hole 9a is located on the outer peripheral side of the screw shaft engaging concave groove 4a. In this state, the portion of the diameter line A connecting the outer peripheral side concave portion 9b and the inner peripheral side concave portion 9c of the stopper plate 9 is pressed in the axial direction, that is, toward the groove bottom side of the stopper member guide groove 8e to form the groove-shaped portion. 9d is formed. Thereby, the stopper plate 9 is set so that the inner diameter of the engagement hole 9a is smaller than the outer diameter of the screw shaft 4 (that is, the engagement hole 9a before the formation of the groove portion).
Is the inner diameter of D1a, and the inner diameter of the engagement hole 9a after the formation of the groove is D1a.
1b, assuming that the outer diameter of the screw shaft 4 is D2, D1a ≒ D2>
D1b) so that the inner peripheral edge of the engaging hole 9a is inserted and locked in the screw shaft engaging groove 4a.

Further, after the formation of the groove portion 9d, the stopper plate engaging projection 8d is engaged with the outer peripheral edge of the stopper plate 9 by caulking (cocking) 8f from the outside of the cylinder, so that the stopper plate 9 is formed. It can be prevented from spreading to the outer diameter side.

In the screw shaft 4 constructed as described above, the screw shaft 4 can be further moved by contacting the nut member 6 with the bottom surface 8a of the stopper member 8 fixed at an appropriate position at the front and rear ends of the screw shaft 4. Is restricted, but the stopper plate 9 for fixing the stopper member 8 to the screw shaft 4 is easily and reliably fixed to the screw shaft 4.

That is, as described above, the stopper member 8
The screw shaft 4 is integrated with the stopper plate 9
And in this state, the outer peripheral side recess 9b of the stopper plate 9
The portion of the radial line A connecting the inner peripheral side concave portion 9c and the inner peripheral side concave portion 9c is pressed in the axial direction, that is, toward the groove bottom side of the stopper member guide groove portion 8e to form the groove portion 9d. As a result, the stopper plate 9 is deformed so that the inner diameter of the engaging hole 9a is smaller than the outer diameter of the screw shaft 4, and the inner peripheral edge of the engaging hole 9a is inserted and locked in the screw shaft engaging concave groove 4a. Thus, the stopper plate 9 is fixed to the screw shaft 4.

As a result, the stopper plate 9 is provided with the engagement hole 9a.
By simply pressing the portion of the radial line A in the axial direction so as to reduce the inner diameter of the screw shaft 4 and forming the groove-shaped portion 9d, the nut can be securely fixed to the screw shaft 4, and the conventional nut can be used. There is no need for troublesome screw cutting work like the one used, and there is no problem even if the screw shaft 4 has a small diameter, which can contribute to cost reduction. Further, it is possible to prevent the stopper member from rattling as in the case where the stopper member is fixed by using a retaining ring.

In this case, the stop plate 9
When assembling to the stopper member 8, the stop plate 9
Is provided with an outer peripheral side concave portion 9b, and the stopper member 8 is provided with a locking convex portion 8b.
The stopper plate 9 is fitted in the stopper member 8 in a state where the outer peripheral side concave portion 9b and the locking convex portion 8d are aligned with each other.
Is rotated to shift the position of the outer peripheral side concave portion 9b and the locking convex portion 8d, and the stopper plate 8 is stopped in a retaining state in which the outer peripheral edge portion is locked by the locking convex portion 8d.
It is convenient to be assembled as one.

Further, since the guide groove 8e is formed in the bottom surface 8a of the stopper member 8, the stopper plate 9
The groove 9d is guided by the guide groove 8e when the groove 9d is formed, so that the groove 9d can be formed more easily.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a moving structure of a seat.

FIG. 2 (X) is a perspective view of the stop plate before the formation of the groove, and FIG. 2 (Y) is a perspective view of the stop plate after the formation of the groove.

FIG. 3 is a perspective view of a stopper member.

FIG. 4 is a partial perspective view of a screw shaft.

FIG. 5 (X) is a sectional view showing a state where a stopper plate assembled to a stopper member is fixed to a screw shaft, and FIG. 5 (Y) is a sectional view taken along the line Y-Y of FIG.

FIGS. 6 (X) and (Y) are views showing a stop member in a conventional example.

[Explanation of symbols]

 Reference Signs List 4 Screw shaft 4a Engagement groove 8 Stopper member 8e Guide groove 9 Stopper plate 9a Engagement hole 9c Inner-side concave 9d Groove

Claims (2)

(57) [Claims] When restricting the movement of a mounting member mounted on a shaft member so as to be relatively movable in the axial direction, an engaging groove is formed on an outer periphery of the shaft member when the stopper member is fixed to the shaft member. Peripherally provided, the stop member is set to a ring shape capable of fitting the shaft member to the inner periphery, and the stop member into which the shaft member is fitted,
A groove-shaped portion formed by folding back in the axial direction of the shaft member,
With a configuration in which the groove sides inserted and engaged with stop wearing the stopper member peripheral portion into engagement grooves by stopping member inside diameter facing Ri in the direction circumferential to form so as to be smaller than the shaft member outer diameter ,
The stop member has a stopper movably fitted to the shaft member.
And the stopper part
The material is provided with a guide groove to form a groove
Fastening structure of the stop member, characterized in that there. 2. The stopper according to claim 1, wherein the inner peripheral edge of the portion of the stopper member where the groove is formed is cut in a concave shape toward the outer radial direction, and the groove is not inserted into the engagement groove. The fastening structure of the set stop member.