JPS6339777Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a coupling mechanism used in a transmission, particularly in a speed change operation mechanism of a truck transmission.

Generally, the gear shift operation mechanism of a vehicle transmission transmits the operating force applied to the change lever to the select and shift lever of the gear transmission, enabling gear changes by changing the gear ratio. It has been structured as follows.

However, the installation position of the transmission differs depending on the vehicle model, that is, the installation position of the transmission is extremely different between cab-over type trucks and bonnet type trucks. It has been difficult to standardize the parts that make up the speed change operation mechanism.

In other words, in cab-over type and bonnet type trucks, due to the difference in the mounting position of the engine, the installation position of the transmission is different, and the size of the transmission operation mechanism, especially the effective height. The effective height of the transmission operating mechanism is usually higher in a bonnet type than in a cab over type.
If a gear change operation mechanism for a bonnet type truck is attached to a transmission for an over-the-cab type truck, it will interfere with the seat or parking brake lever in the cab, and therefore the gear change operation mechanism for the over-the-cab and bonnet-type trucks will interfere with the seat and parking brake lever in the cab. It has been difficult to standardize the components of the operating mechanism.

The purpose of this invention is to lower the effective height to enable gear shifting operations in bonnet-type truck transmissions, and also to enable application to cab-over type truck transmissions. An object of the present invention is to provide a coupling mechanism used in a transmission speed change operation mechanism, which aims to standardize the component parts of the mechanism and reduce production costs.

With these issues in mind, the coupling mechanism used in the gear shift operation mechanism of the transmission of this invention is as follows:
a select and shift shaft with a select and shift lever; and below the select and shift shaft;
The select and shift shaft is located perpendicularly to the select and shift shaft, and the corresponding
and a link shaft provided with a select and shift lever and a pair of select and shift heads that mesh with the change lever.

Hereinafter, preferred specific examples of the coupling mechanism used in the transmission speed change operation mechanism according to this invention will be described with reference to the drawings.

FIGS. 1 and 2 show a specific example 10 of a coupling mechanism used in the gear change operation mechanism of the transmission of this invention applied to a bonnet-type truck.

The coupling mechanism 10 includes a housing 11 attached to the gear transmission of the bonnet type truck.
a select-and-shift shaft 12 that is rotatably and reciprocably disposed within the select-and-shift shaft 12 and includes a select-and-shift lever 13; a pair of select-and-shift heads arranged perpendicularly to the select-and-shift shaft 12 and meshing with the corresponding select-and-shift lever 13 and change lever 17; 15, 16, and a link shaft 14.

Select and shift shaft 12 is
It is arranged above the housing 11 so as to be rotatable and reciprocating, and is provided with a select and shift lever 13 directed downward at a predetermined position.

Of course, the select and shift shaft 12 is rotated and reciprocated as the select and shift lever 13 moves.
When the select-and-shift shaft 12 is reciprocated, it enables selection and
The select and shift shaft 12 is configured to enable shifting when rotated. Accordingly, the select and shift shaft 12 is configured to allow selective driving of a plurality of fork shafts (not shown) by such rotation and reciprocation.

The link shaft 14 is configured such that it can rotate and reciprocate below the select and shift shaft 12 and is disposed in a direction perpendicular to the select and shift shaft 12. It is supported by the housing 11.

That is, a pair of link shaft guide bores 22 are provided in the lower side portions of the housing 11 so that the link shaft 14 can be disposed in a direction perpendicular to the select and shift shaft 12. 23, respectively, and both ends of the link shaft 14 are fitted into the link shaft guide bores 22, 23, respectively. Therefore, the link shaft 14 is disposed below the select and shift shaft 12 in a direction perpendicular to the select and shift shaft 12, and the link shaft guide
It is rotatably and reciprocatably supported by the bores 22 and 23.

Of course, a pair of end caps 24 and 25 are respectively attached to the outside of the link shaft guide bores 22 and 23 of the housing 11 so as to cover both ends of the link shaft 14. Protect both ends of 14,
The link shaft guide bore 22, 23
This prevents sand, dust, water, etc. from entering the housing 11.

Furthermore, the link shaft 14 is provided with a pair of select and shift heads 15 and 16 that engage with corresponding select and shift levers 13 and change levers 17, respectively.

That is, one select and shift
The head 15 is fixed to one side of the link shaft 14 and engaged with the select and shift lever 13.

The other select and shift head 16 is fixed to the other side of the link shaft 14 at a predetermined distance from the select and shift head 15, and is connected to the change lever 17. is engaged with.

Of course, the change lever 17 is rotatably supported in the housing 11 above the select and shift head 16.
That is, in the upper part of the housing 11,
A bore 21 for loosening the change lever 17 is formed, a ball seat 19 is fitted into the bore 21, and the ball portion 18 of the change lever 17 is inserted into the ball seat 19.
is rotatably supported. The housing 1
1 is fitted with a boot 20 so as to cover above the ball portion 18 of the change lever 17 to prevent sand, dust, etc. from entering into the housing 11.

Therefore, in the above-mentioned coupling mechanism 10, the operating force applied to the change lever 17 is applied to the pair of select and shift heads 15, 16.
It is configured to be transmitted to the select and shift lever 13 via a link shaft 14 comprising a link shaft 14.

Of course, the change lever 17 is preferably rotatably supported by the housing 11, with the ball portion 18 located at approximately the same height as the select and shift shaft 12.

Next, to describe the operation of the above-mentioned linkage mechanism 10, when the change lever 17 is moved in the direction of the arrow in FIG. Ru.

When the select and shift head 15 is rotated in this way, the select and shift head 15 is rotated via the select and shift lever 13.
The shift shaft 12 is moved axially to select the gear to be used in the gear transmission. Of course,
Even if the change lever 17 is moved in the opposite direction to that described above, other gears are selected in the same way.

When the change lever 17 is moved in the direction of the arrow in FIG. 1, the link shaft 14 and select and shift heads 15, 16 move to the left.

When the select and shift head 15 moves in this way, the select and shift shaft 12 rotates clockwise via the select and shift lever 13, and the gear in use is shifted. Ru. Of course, in FIG. 1, the change lever 1 is
7 is moved, the other gears are shifted in the same way.

As such, in the linkage 10 that allows for select and shift operations, the link shaft 14 extends below the select and shift shaft 12 in a direction perpendicular to the select and shift shaft 12. placed in
Furthermore, the link shaft 14 has a pair of select and shift heads 15,1 that transmit the operating force applied to the change lever 17 to the select and shift lever 13.
6, so its change lever 17
The center of rotation of the coupling mechanism 10 can be located at a lower position, and the effective height of the coupling mechanism 10 can be lowered, thereby reducing the constraints on the mounting space on the bonnet-type truck.

According to this idea by Nyojo, select and
including a shift shaft and a link shaft;
The select and shift shaft includes a select and shift lever, and the link shaft includes a select and shift lever.
The select-and-shift shaft is disposed below the shift shaft in a direction orthogonal to the select-and-shift shaft, and has a corresponding select-and-shift shaft.
Equipped with a pair of select and shift heads that engage the shift lever and change lever, the select and shift
Compared to the existing connection mechanism in which the change lever is directly connected above the lever, the effective height is lower, which means that the center of rotation of the change lever can be located lower, and the bonnet-type truck It is now possible to operate the transmission in the cab without interfering with the seat or parking brake lever, and it is also possible to apply the transmission to a cab-over type truck. This makes it possible to standardize the components of the speed change operation mechanism in trucks, lowering production costs and making it extremely practical.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a specific example of a coupling mechanism used in the gear change operation mechanism of the transmission of this invention applied to a bonnet-type truck, and FIG. FIG. DESCRIPTION OF SYMBOLS 10...Connection mechanism used for the gear change operation mechanism of the transmission, 11...Housing, 12
...Select and shift shaft, 13
...Select and shift lever, 14...
...Link shaft, 15, 16...Select
and shift head, 17...change lever.

Claims (1)

[Claims for Utility Model Registration] A select-and-shift shaft equipped with a select-and-shift lever, and a direction perpendicular to the select-and-shift shaft below the select-and-shift shaft. and a link shaft having a corresponding select and shift lever and a pair of select and shift heads that mesh with the change lever. Connection mechanism.