JPS647379Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the mounting structure of an operation knob, and is suitable for shift knobs of manual transmissions for automobiles that require a certain tightening force and are positioned in a certain direction.

A shift knob is generally screwed to the upper end of the shift lever of an automobile manual transmission, but a shift pattern is usually displayed on the top surface of the shift knob, and when installing it,
The display of this shift pattern must be positioned in a certain direction and securely fixed.

For this purpose, various mounting structures have been used in the past, including those using lock nuts as shown in FIGS. 1a and 1b. That is, in the case shown in FIG. 1A, the lock nut 3 is screwed into the male threaded part 2 at the tip of the shift lever 1, and after the female threaded part 5 of the shift knob 4 is screwed in almost completely, it is turned in a certain direction (so that the shift pattern is forward). After positioning, a lock nut 3 is brought into contact with the lower surface of the shift knob 4 and fixed.

However, when this lock nut 3 is used, the shape of the shift knob 4 is restricted and the lower end cannot be extended into a cylindrical shape to cover the shift lever 1. There is also a design problem in that the lock nut 3 is exposed.

Therefore, as shown in FIG. 5B, there is a method that uses a specially shaped lock nut 6 to solve the problem, but this is disadvantageous in terms of cost and workability.

Further, as shown in FIG. 2, a resin insert 7 made of nylon or the like is integrally molded inside the shift knob 4, and a female threaded portion 8 and an unthreaded portion 9 are formed in this insert 7. Some shift levers have a locking function by threading the unthreaded part 9 of the male threaded part 2 of the shift lever 1.

In this case, the shift knob 4 can be simply screwed in and the workability is good, but there is a problem that the insert 7 made of resin is always required and cannot be applied to a metal insert or the like.

Furthermore, as shown in FIG.
An insert 10 having a tapered upper end and a tapered hole that matches the upper end of the shift knob 4.
There is also one in which the parts are integrally molded and fixed with spring pins 11 after being fitted together.

In such a structure, unless the tapered parts of the shift lever 1 and shift knob 4 are machined with high accuracy, looseness will occur and the spring pin 1 will
There are operational problems such as aligning the holes in order to insert 1.

The object of the present invention is to solve these conventional problems and provide a mounting structure for an operation knob that is easy to assemble and can be reliably positioned and prevented from loosening. The configuration of the present invention to achieve such an object is to screw the male threaded portion of the operation knob onto the male threaded portion at the tip of the operating shaft, and apply a predetermined tightening force between the nut screwed to the male threaded portion and the female threaded portion. In the mounting structure in which the operating knob is attached to the tip of the operating shaft with the operating knob facing in a certain direction, an insert having the female thread portion is integrally provided inside the operating knob, and an end portion of the operating knob is The insert is formed so as to surround the nut in the attached state, applies a predetermined tightening force between the nut and the insert, and rotates them along the male threaded portion of the operating shaft while in the connected state. It is characterized by interposing an annular spring material obtained from the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the operating knob mounting structure of the present invention applied to a shift knob of a manual transmission for an automobile will be described in detail with reference to the drawings.

As shown in FIG. 4a, the shift knob 20 is composed of a resin jacket 21 and a metal insert 22, and the shift knob 20 of this embodiment also includes a spring washer 23, which is an annular spring material. .
An insertion hole 24 for the shift lever is formed in the outer cover 21, and an insert 22 is integrally molded therein.A female threaded portion 25 is formed coaxially with the insertion hole 24 in the insert 22, and a spring washer is inserted into the outer cover 21. 23 mounting portions 26 are formed, and by making the collar portion 27 eccentric to the insertion hole 24, the outer sheath 21 and the insert 22 rotate together as the shift knob 20 rotates.

On the other hand, as shown in FIG. 4b, the shift lever 30 has a male threaded portion 31 formed at its upper end, as in the conventional case, and is adapted to be screwed into the female threaded portion 25 of the insert 22.

Next, the process of assembling the shift knob 20 and shift lever 30 constructed as described above will be explained with reference to the process diagram shown in FIG. 5.

First, lightly tighten the nut 32 onto the male threaded portion 31 of the shift lever 30, and then tighten the shift knob 2.
The spring washer 23 is attached to the attachment part 26 of 0. The spring washer 23 used has a characteristic of being able to flex appropriately when the shift knob 20 is screwed in by hand.

When the female threaded part 25 of the shift knob 20 is screwed into the male threaded part 31 of the shift lever 30, the spring washer 23 and the nut 32 lightly touch each other, and as the spring washer 23 becomes effective, the tightening torque gradually increases. When the operator feels that the appropriate tightening torque has been obtained,
Normally, tighten the spring washer 23 until it comes into close contact.

In this tightened state, the lower surface of the insert 22 of the shift knob 20 and the nut 32 of the shift lever 30
Spring washer 2 interposed between the upper surface of
A frictional force is generated between the male threaded portion 31 and the female threaded portion 25 due to the reaction force No. 3, and a tightening torque corresponding to this force is generated.

Next, the shift knob 20 is returned to the loosening direction in order to position the shift knob 20 so that the shift pattern display attached to the top surface thereof is oriented in a predetermined direction. When the shift knob 20 is returned, the spring washer 23 is bitten into the lower surface of the insert 22 and the upper surface of the nut 32, so the shift knob 20 and the spring washer 2
3 and 3 are rotated along the male threaded portion 31 of the shift lever 30 while being completely connected together without loosening from the nut 32, and the tightening torque is maintained almost unchanged from the initial tightening.

In this way, by attaching the shift knob 20 to the shift lever 30, it is possible to perform positioning and secure attachment. The tightening torque of the shift knob 20 in this case changes as shown in FIG. First, remove the spring washer 23 without the nut 32 on the male threaded portion 31 of the shift lever 30.
To explain the case where the shift knob 20 is screwed in with a The screwed-in length of the shift knob 20 up to the screw-in length l is extremely small, and it is impossible to perform alignment and maintain a large tightening torque within this screwed-in length l.

On the other hand, as in the proposed mounting structure, the shift lever 30
With the nut 32 lightly tightened into the male threaded portion 31 of the screwdriver, the shift knob 20 is screwed in via the spring washer 23, and the operator determines that the appropriate tightening torque is applied with the spring washer 23 (b, c). , When the shift knob 20 is unscrewed to position the shift knob 20 from point d, the shift knob 20
The spring washer 23 and nut 32 are simply returned along the male threaded portion 31 of the shift lever 30 while remaining integral, and the frictional force between the male threaded portion 31 and the female threaded portion 25 is applied by the spring washer 23. It will remain as it is.

Therefore, when the shift knob 20, spring washer 23, and nut 32 are integrated, the tightening torque is almost reduced to about 2 to 3 pitches before the shift lever 30 comes off the male threaded portion 31 of the shift lever 30. Therefore, the tightening torque is almost constant up to points o, p, and q. Therefore, it is possible to position the shift knob 20 in any direction within a fairly long screw-in length range L between b and o, between c and p, and between d and q.

In the above embodiment, the spring washer is integrally attached to the shift knob, but it may be attached separately during assembly. Moreover, it is also possible to use a disc spring instead of a spring washer. Furthermore, in order to further ensure the biting of the annular spring material, it is also effective to form irregularities on at least one of the upper surface of the nut and the lower surface of the insert. Further, the scope of application is not limited to shift knobs of transmissions, but can be widely applied to operation knobs that are screwed together.

As explained above in detail along with the embodiments, according to the present invention, the operation knob can be easily installed.
No tools such as spanners are required, and even if the tightening torque changes depending on the ability of the operator, positioning is possible while maintaining the tightening torque.

[Brief explanation of drawings]

FIGS. 1a, b to 3 are sectional views of conventional operating knob mounting structures, FIGS. 4 a, b are sectional views of an embodiment of the operating knob mounting structure of the present invention, and FIG. The figure is an assembly process diagram of the present invention, and FIG. 6 is an explanatory diagram of changes in tightening torque. In the drawing, 20 is a shift knob, 21 is an outer cover, 22
is the insert, 23 is the spring washer, 24
is the insertion hole, 25 is the female threaded part, 26 is the mounting part, 27
is the flange, 30 is the shift lever, 31 is the male threaded part,
32 is Natsu.

Claims (1)

[Scope of utility model registration request] The female threaded part of the operating knob is screwed into the male threaded part at the tip of the operating shaft, and a predetermined tightening force is generated between the nut screwed into the male threaded part and the female threaded part, so that the operating knob is operated. In the mounting structure for mounting on a shaft tip facing in a certain direction, an insert having the female thread portion is integrally provided inside the operating knob, and an end of the operating knob surrounds the nut in the mounted state. and an annular spring member is interposed between the nut and the insert, which applies a predetermined tightening force between the nut and the insert, and allows them to rotate along the male threaded portion of the operating shaft while being connected. Features a mounting structure for the operation knob.