JPH0143325Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a door mirror for an automobile, and particularly to a shock-absorbing door mirror for an automobile in which a mirror housing is rotatably supported.

[Conventional technology]

Since door mirrors are installed so that they protrude from the outside of the vehicle, there is a chance that they may collide with external obstacles while driving.

In order to reduce the impact in the event of a collision,
A shock absorber that rotatably supports the mirror housing relative to the mirror base, allows both of the above members to make sliding contact on a plane perpendicular to the rotation axis, and is provided with spring means that applies pressure to the sliding contact surface. type door mirrors are used.

FIG. 1 is an exploded perspective view showing an example of this type of shock-absorbing door mirror commonly used in the past.

1 is a mirror base that is fixed to a car door;
2 is a mirror housing that supports the mirror 3.

Reference numeral 4 denotes a mirror housing bracket, which is integrally fixed to the mirror housing 2 with mounting screws (not shown). The mirror 3 is attached to the above-mentioned bracket 4 via a remote controller drive unit 5. 5a is a code for remote control.

A cylindrical bearing 6 is integrally molded on the mirror base 1 and a cylindrical bearing 7 is integrally molded on the mirror housing bracket 4, and a tubular shaft 8 is attached to the bearings 6 and 7.
is inserted therethrough to rotatably support both members. The reason why the shaft 8 is formed into a tubular shape is to wire the remote control cord 5a.

The rotation of the mirror housing 2 is locked at a predetermined angular position so that it can withstand the rotational force (e.g. wind pressure) that it is subjected to under normal conditions, and it can also be prevented from rotating when it is subjected to an abnormally large rotational force (e.g. due to a collision with an external obstacle). A coil spring 9 is attached to the shaft 8 to reduce the impact.
The mirror base 1
A concave and a convex portion are formed on the abutting surfaces of the mirror housing bracket 4 and the mirror housing bracket 4 for engagement. In this example, the mirror base 1 is provided with a projection 10, and the mirror housing bracket 4 is provided with a recess that engages with the projection (in this figure, a protrusion 11' on the back side of the recess is visible). . A cross-sectional view of this portion taken along a plane parallel to the axis of the shaft 8 is shown in FIG. In FIG. 2, 10 is a protrusion provided on the mirror base 1, and 11 is a recess provided on the mirror housing bracket. 11'
is the ridge that appears in Figure 1.

The conventional shock-absorbing door mirror configured as described above has a problem in that the protrusion 10 is likely to wear out with use, causing play.

In order to solve the above problem, as shown in FIG. 3, a majority of the steel ball 12 is buried in the mirror base 1, a part of which is made to protrude, and the protrusion is engaged with the recess 11. is also publicly known.

In the door mirror shown in FIG. 3 above, even if the mirror base 1 is made of a relatively soft material such as synthetic resin or die-cast alloy, the steel balls 12 are used as engagement protrusions. It has better durability than the conventional example shown.

[The problem that the idea attempts to solve]

However, in the conventional example using the steel ball 12 as shown in FIG. Durability is not sufficient because pressure is concentrated and local pressure becomes high. If a hardened, hardened steel ball is used to improve the durability of the protrusion side, wear and tear on the concave side will be accelerated, and the overall durability will actually decrease.

The present invention aims to improve the problems of the prior art as described above and provide a shock-absorbing door mirror with a simple structure and excellent durability.

[Means to solve the problem]

In order to achieve the above object, the door mirror of the present invention rotatably supports the mirror housing with respect to the mirror base, and both of the above members are brought into sliding contact in a plane perpendicular to the rotation axis, and In the above-mentioned buffer-type door mirror equipped with a spring means that applies pressure to the sliding contact surface, a plurality of rollers are installed on the sliding contact surface of either the mirror housing or the mirror base so that the axis thereof intersects with the rotation axis of the mirror housing. The roller is disposed and fixed to the roller, and the other sliding contact surface of both members is provided with a recess that fits into the side surface of each roller at a location where it faces the roller.

[Effect]

Since the door mirror of the present invention has the above-described configuration, the contact area between the roller and the recess is wider than that of conventional steel balls, making it less likely to wear out.
In particular, since the multiple rollers are arranged and fixed so that their axes intersect with the rotating axis of the mirror housing, the tangent of rotation of the mirror housing and the tangent of rotation of the rollers are in the same direction, and The rollers prevent uneven wear and enable smooth operation.

〔Example〕

FIG. 4 is a schematic sectional view shown to explain the principle of the present invention, and corresponds to FIG. 3 in the conventional example. The difference from the conventional example shown in FIG. 3 is that a steel roller 13 is embedded in the mirror base 1 instead of the steel ball 12, and as described later, the axis of the roller 13 is aligned with the rotation of the mirror housing. This is a point placed so as to intersect with the axis of motion.

In this figure, the circle of the end face of the roller 13 is visible. A-A' is a sliding contact surface between the mirror base 1 and the mirror housing bracket 4.

The axis of the roller 13 (represented as point 0 in this figure) is parallel to the sliding contact surface A-A',
And it is set below the sliding contact surface A-A'.

When implementing the present invention, the roller 13 may be fixed to the sliding contact surface on the mirror housing side, and the recess 11 may be provided in the sliding contact surface on the mirror base side.

FIG. 5 shows a specific embodiment of the present invention.
Mirror base 1', mirror housing 2', mirror housing bracket 4', and tubular shaft 8', which are shown with the same drawing reference numbers as the conventional example in FIG. It is a constituent member of

FIG. 6 is a cross-sectional view of FIG. 5.

For convenience of assembly work, the mirror base 1' of this embodiment has a face plate portion 1a facing the mirror housing.
is molded separately and fixed to the mirror base with mounting screws 1b.

A cylindrical bearing 6' is integrally molded on the face plate portion 1a, a cylindrical bearing 7' is integrally molded on the mirror housing bracket 4', and a tubular shaft 8' is attached to both cylindrical bearings 6', 7'. is inserted, and both cylindrical bearings 6', 7' are rotatably attached. Further, a flange 8a is provided at one end of the tubular shaft 8', and a snap ring groove 8b is provided near the other end.

A coil spring 9' is fitted onto the cylindrical bearing 7',
The snap spring 15 is pressed by a washer-like spring receiver 14 and fitted into the snap ring groove 8b, thereby biasing the mirror base 1' and the mirror housing 2' in the direction of attracting each other.

Three steel rollers 13, 1 are mounted on the face plate portion 1a where the mirror base faces the mirror housing.
3' and 13'' are arranged and fixed so that the axes OB, OB', OB'' of each roller intersect with the axis of the tubular shaft 8.

The reference numeral 16 shown in FIGS. 5 and 6 is a projection for a stopper, and the reference numeral 17 shown in FIG. The corners are restricted.

As shown in FIG. 5, the surface of the mirror housing bracket 4' facing the roller 13 is provided with a recess 11'' on a cylindrical surface that engages with the outer periphery of the roller.

When carrying out the present invention, the shape of the recess 11'' does not have to be exactly cylindrical.

Note that in the above, fixing the rollers means fixing their relative positions, and therefore includes holding them so that they can rotate at a fixed position.

The buffer type door mirror configured as above is
The roller 13 is locked in rotation when engaged with the recess 11'' and maintains a predetermined installation posture, but when a large external force is applied, the coil spring 9' is compressed and the roller 13 escapes from the recess 11''. However, since the above-mentioned engagement is released and the mirror housing 2' is free to rotate, it performs the same buffering function as the conventional example (FIG. 1).

As is clear from the principle diagram shown in Fig. 4, the roller 13 has a wider contact area with the recess 11 than the conventional steel ball 12 (Fig. 3), and has a lower contact surface pressure, so it is less likely to wear out. , has excellent durability. Also, the axis of each roller is shown in Figure 6.
OB, OB', OB'' are arranged so as to intersect with the rotation axes of the sliding members, so the rotation cutting line of the mirror housing is in the same direction as the rotation cutting line of each roller, and multiple Since it is supported by rollers, it operates smoothly and prevents uneven wear.

As an embodiment of the present invention, the sliding contact surface between the mirror base 1 and the mirror housing 2' shown in FIG. However, when implementing this invention,
A similar effect can be obtained by using the above-mentioned sliding contact surface as a rotating surface formed by the line D-D'. In the present invention, a substantially perpendicular surface when "the mirror base and the mirror housing are brought into sliding contact substantially perpendicular to the rotation axis" includes a surface that mechanically acts equivalently to a perpendicular surface. , a conical surface with a large apex angle, a spherical surface with a large radius of curvature, etc.

[Effect of idea]

As detailed above, the door mirror of the present invention is
In addition to performing a buffering function, it has excellent practical effects of having great durability.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a conventional shock-absorbing door mirror, and FIG. 2 is a sectional view of the vicinity of the protrusion of the above embodiment. FIG. 3 is a sectional view showing another conventional example corresponding to FIG. 2. FIG. 4 is a schematic diagram for explaining the principle of the present invention, FIG. 5 is a cross-sectional view of an embodiment of the present invention, and FIG. 6 is a cross-sectional view taken from FIG. 1, 1'... Mirror base, 2, 2'... Mirror housing, 3... Mirror, 4, 4'... Mirror housing bracket, 5... Remote controller drive section, 5a... Cord, 6, 6' ,7,
7'...Tubular bearing, 8,8'...Tubular shaft, 8a
...Flange, 8b...Snat spring groove, 9,
9'...Coil spring, 10...Protrusion, 11
...Concavity, 11'...Protuberance on the back side of the concavity, 13...
...Steel roller, 14...Spring holder, 15...
...Snat spring, 16...Stopper protrusion, 17
...stoppa groove.

Claims (1)

[Scope of utility model registration request] The mirror housing is rotatably supported with respect to the mirror base, and a spring means is provided to bring both of the above members into sliding contact on a surface substantially perpendicular to the rotation axis, and to apply pressure to the sliding contact surface. In a buffer-type door mirror, a plurality of rollers are arranged and fixed on the sliding surface of either of the above two members so that their axes intersect with the rotating axis of the mirror housing, and A door mirror characterized in that the other sliding surface is provided with a recess that fits into a side surface of each of the rollers at a location where it faces the rollers.