JPS5834505Y2 - Transmission operating mechanism - Google Patents

Description

[Detailed description of the invention] This invention is a direct control type operation mechanism that directly operates the shift and select lever shaft and the fork shaft through the shift and select lever by operating the gear change lever in automobiles and other gear transmissions. It is related to.

Generally, in this type of operating mechanism, vibrations caused by gear meshing in the transmission or vibrations from the engine are transmitted from the fork shaft to the shift lever through the shift and select lever and the shift and select lever shaft.

As a result, the gear shift lever chatters and vibrates, which causes unpleasant noise in the vehicle interior.

Therefore, various attempts have been made to dampen the vibrations by using vibration isolating materials such as rubber or synthetic resin on the above-mentioned gear shift lever or the spherical support part of the gear shift lever, but the housing is not effective. It is insufficient in terms of

In view of these conventional problems, this invention aims to provide an operating mechanism that can effectively reduce the vibration of the gear shift lever and improve the operating feeling during shift operation. That is the purpose.

Next, the configuration of this invention will be explained in detail according to an embodiment shown in the drawings.

First, referring to Figure 1, which is a cross-sectional view of a part of a direct control type operating mechanism for an automobile transmission, inside the extension housing 2 assembled into the transmission case 1, there are: A shift and select lever shaft 5 is provided so that it can reciprocate (shift operation) and rotate (select operation) along its axial direction.

Additionally, the gear shift lever 10 is spherically supported by a lever retainer 9 fixed to the upper surface of the extension housing 2 under a predetermined spring load.

The spherical tip 10a of the lever 10 is fitted inside the extension housing 2 into a lever knob 11 fixed to the shift and select lever shaft 5.

Therefore, by operating this speed change lever 10, the shift and select lever shaft 5 is given the aforementioned shift operation and select operation.

On the other hand, a shift and select lever 6 is integrally formed at the left end of the shift and select lever shaft 5 in FIG.

The tip portion 6a of this lever 6 is connected to the shift lever 1 described above.
0 operation, the lever shaft 5 selectively engages with each engagement groove 4 formed in a plurality of (usually three) fork shafts 3. Located to get.

When these fork shafts 3 receive a shift operation force through a lever shaft 5 and its lever 6, they reciprocate along their axial direction, and as is commonly known, a shift fork (not shown) is formed in a transmission. ).

Now, the tip portion 6 of the shift and select lever 6
a is always located within the retaining groove 4 of one of the fork shafts 3.

For example, when the gear shift lever 10 is in the select return position, the tip portion 6a of the shift and select lever 6 is generally located in the retaining groove of the fork shaft in the 3rd and 4th operation where shifts are frequently performed. It is true.

As is clear from FIGS. 2 and 3, the tip 6a of the lever 6 is covered with a cover 1 made of an elastic material such as relatively hard rubber or synthetic resin.

Moreover, this cover 7 has a position (see FIGS. 2 and 3
A protrusion 8 made of a relatively soft elastic material is provided so as to slightly protrude from the surface of the cover 1 at the left and right positions in the figure.

It should be noted that there is a second
As is clear from the figure, a gap D' is ensured in each case.

In such a configuration, a cover 7 and a protrusion 8, which are two types of elastic bodies, are interposed between the tip portion 6a of the shift and select lever 6 and the engagement groove 4 of the fork shaft 3. ing.

Therefore, vibrations caused by gear meshing in the transmission or vibrations from the engine are absorbed or alleviated between the fork shaft 3 and the tip portion 6a of the shaft and select lever 6.

As a result, the vibrations transmitted to the speed change lever 10 through the shift and select lever shaft 5 are significantly damped, and the unpleasant noise caused by the vibrations of the speed change lever 10 is reduced.

By the way, when the shift lever 10 is operated to shift, the shift and select lever 6 is operated in either direction of the arrows A-A in FIG. 2, as described above.

In this case, first, the protrusion 8 made of a soft elastic body
is in contact with the inner surface of the retaining groove 4 in the fork shaft 3.

After this protrusion 8 is bent, the cover 1 made of a hard elastic body comes into contact with the inner surface of the retaining groove 4 and is elastically deformed.

In other words, during a shift operation, two types of elastic bodies exhibit hysteresis characteristics.

As a result, it is possible to absorb or alleviate the impact force (double-shift phenomenon, etc.), sliding resistance, or unpleasant resistance force associated with spline engagement during a shift operation, thereby improving the feel of the shift operation.

FIG. 4 and FIG. 5 show different embodiments of this invention, and FIG. 4 shows the dimensions of the projection 80 made of a soft elastic body with respect to the selection operation direction. This is set larger than in the embodiment shown in FIG.

Similarly, in FIG. 5, the dimensions of the protrusion 8 are set larger in the vertical direction shown in the figure than in the previously described embodiment.

In both the embodiments shown in FIGS. 4 and 5, the contact surface of the protrusion 8 with the inner surface of the engagement groove 4 is set larger than in the previous embodiment. , its functions are similar to those shown in FIGS. 1 to 3.

In addition, in each of the above embodiments, the cover 7 and the protrusion 8
In order to protect the outer periphery of the metal plate, it is also possible to fix a metal plate or an alternative member to the outer periphery of the metal plate.

As described above, this invention can attenuate the vibrations transmitted from the fork shaft to the shift and select lever, thereby significantly reducing the unpleasant noise that occurs inside the vehicle due to chatter vibration of the gear shift lever. can be significantly reduced.

Moreover, in addition to the above-mentioned effects, this invention can alleviate impact forces and various resistance forces during shift operations, and can improve the feeling of shift operations.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a sectional view showing a part of the operating mechanism in a transmission, and Fig. 2 is a partially cutaway front view showing an enlarged main part of Fig. 1. Figure 3 is the second
Fig. 4 is a sectional view showing a different embodiment in the same state as Fig. 3, and Fig. 5 is a sectional view showing a further different embodiment in the same state as Fig. 2. be. 3... Fork shaft, 4... Engagement groove, 5... Shift and select lever shaft, 6... Shift and select lever 5 a
,,,, Tip of the shift and select lever, 1...Cover (hard elastic body), 8...
...Protrusion (soft elastic body).

Claims (1)

[Scope of utility model registration request] Covering the tip of a shift and select lever arranged so as to be selectively engaged with the engagement groove formed at the end of each fork shaft in the transmission with a cover made of a hard elastic material; , a protrusion made of a soft elastic material is formed on the surface of the cover at a position relative to the operating direction of the shift and select lever associated with a shift operation, so as to slightly protrude from the surface of the cover. The operating mechanism of the transmission.