JPH032053Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a select return device that functions to always bias the shift lever in a predetermined select direction in a direct operation control mechanism of an auxiliary transmission. It is something.

(Prior Art) Conventionally, the control mechanism of the auxiliary transmission has been provided with a select return device in the same way as the main transmission, thereby clarifying the shift position of the shift lever and improving its operability. I am considerate. However, general select return devices, as shown in Utility Model Application Publication No. 10118/1983,
A select return spring is attached to the shaft that is built into the shift lever retainer. In order for this select return spring to exert elastic force (select return force), a complex structure is required in which the end of this spring is locked into an engagement hole formed in the shift lever retainer. shall be. As a result, a select return device having such a complicated structure may not be provided for an auxiliary transmission, which is shifted less frequently than the main transmission.

(Problem to be solved by the invention) As mentioned above, there are cases where the sub-transmission is not provided with a select return device, but in this case, play in the select direction of the shift lever becomes large, and the shift lever due to this becomes large. This may cause problems such as vibration, or the shift position may become unclear, resulting in poor operability. In addition, if a select return device is installed in the sub-transmission, problems with shift lever vibration and operability will be resolved, but installing this select return device will cause problems in assembly work and increase costs. The same problem remains.

(Means for Solving the Problems) As shown in FIGS. 1 and 2, the present invention is directed to the shift lever 15 of the shift lever retainer joint surface 3 around the upper opening 2 of the auxiliary transmission case 1. Grooves 4 are formed at two locations facing each other in the shift direction. End portions 21 of springs 20 that abut a portion of the shift lever 15 and apply a select return force are engaged with these grooves 4, respectively. These grooves 4 are closed by assembling the shift lever retainer 10 to the shift lever retainer joint surface 3 of the auxiliary transmission case 1 while keeping each end 21 of the select return spring 20 engaged. .

(Function) According to the above configuration, the select return spring 20 is assembled to the shift lever retainer joint surface 3 of the auxiliary transmission case 1 before the shift lever retainer 10 is assembled to the auxiliary transmission case 1. The respective ends 21 of the select return spring 20 are respectively engaged with the grooves 4 that are located therein. Thereafter, by assembling the shift lever retainer 10 to the shift lever retainer joint surface 3, each of the grooves 4 described above are both closed by the shift lever retainer 10, and in this state, the select return spring 20 is connected to the auxiliary transmission. Properly assembled and held on the case 1 side, the auxiliary transmission case 1
The select return spring 20 can be easily assembled to the holder.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings.

Figure 1 shows a cross-section of the main parts of the direct operation type control mechanism in the auxiliary transmission, Figure 2 shows a cross-section taken along the - line in Figure 1, and Figure 3 shows a cross-section taken along the - line in Figure 1. In the figure, a forkshaft 6 for high/low switching and a forkshaft 7 for switching between two wheels and four wheels are assembled inside an auxiliary transmission case 1 so as to be slidable along their respective axes. In addition, the sub-transmission case 1
A shift lever retainer 10 is attached to the shift lever retainer joint surface 3 around the upper surface opening 2 with bolts 11 . On the spherical sheet 12 of the shift lever retainer 10, a spherical portion 16 of a directly operable shift lever 15 is mounted for a shift operation in the direction shown by arrow A in FIG.
It is supported on a spherical surface so that it can be selectively operated in the direction indicated by arrow B in the figure. And this shift lever 1
Lever tip 1 extending downward from the spherical part 16 of 5
7 is located inside the auxiliary transmission case 1 so as to be engageable with the shift heads 8 and 9 of each forkshaft 6 and 7, respectively.

Note that a spring (not shown) is installed between the spherical portion 16 of the shift lever 15 and a spring cap (not shown) fixed to the opening of the shift lever retainer 10, and this causes the shift The spherical portion 16 of the lever 15 is in contact with the spherical sheet 12 of the shift lever retainer 10.
It is assembled with a certain preload applied.

Of the shift lever retainer joint surface 3 of the sub-transmission case 1, the arrow A of the shift lever 15
Grooves 4 each having an open top surface are formed in portions facing each other in the shift direction shown by , that is, portions facing each other in the left-right direction in FIG.
Both ends 21 of a select return spring 20 formed as shown in FIG. 4 are respectively engaged with these grooves 4 prior to assembly of the shift lever retainer 10. In this state, by assembling the shift lever retainer 10 to the shift lever retainer joint surface 3 of the sub-transmission case 1 as described above, each of the grooves 4 engages and holds both ends 21 of the select return spring 20. It is blocked by

In addition, the select return spring 20, whose both ends 21 are assembled to the sub-transmission case 1 side as described above, has an intermediate portion 22 attached to the shift lever 15 as shown in FIGS. It is in contact with a part of the Note that the intermediate portion 22 of the select return spring 20 is in the state shown by the imaginary line a in FIG. 2 when the spring 20 is in its free state. By assembling the select return spring 20 as described above, the spring 20 is brought into the state shown by the solid line in FIG. It is. As a result, the select return spring 20 has a select turn force in the direction of pressing the lever tip 17 of the shift lever 15 toward the shift head 9 of the fork shaft 7 for switching between two and four wheels.

In the select return device configured as described above, the shift lever 15 is now at the position shown by the solid line in FIG. Assume that it is held at the position shown by the solid line in FIG. Therefore, the shift lever 15 at this time
As is clear from FIGS. 2 and 3, the lever tip 17 is connected to the fork shaft 7 for switching between two and four wheels.
is engaged with the shift head 9 of. This state is a shift position for high-speed four-wheel drive, and corresponds to the shift position H4 on the upper side of the drawing in FIG. 5, which shows the shift pattern on the lever tip 17 side of the shift lever 15.

Now, when the shift lever 15 is shifted in the direction of arrow A in FIG. 1 and the tip 17 of the lever is moved to the position shown by the imaginary line A2 in FIG. FORSHAFT 7
is slid to the right in FIGS. 1 and 3. As a result, the sub-transmission is switched from the above-mentioned high-speed four-wheel drive to high-speed two-wheel drive, and the shift position on the lever tip 17 side of the shift lever 15 corresponds to the shift position H2 in FIG. 5. Also, when the shift lever 15 is selectively operated in the direction of arrow B in FIG. 2 from the above-mentioned high-speed four-wheel drive shift position,
The tip 17 of the lever engages with the shift head 8 of the fork shaft 6 for high/low switching, as shown by the imaginary line B2 in FIG. The shift position on the lever tip 17 side at this time corresponds to the shift position H4 shown on the lower side of FIG. From this state, when the shift lever 15 is shifted in the direction of arrow A in FIG. 1 and the tip 17 of the lever is moved to the imaginary line A3 in FIG. The slide operation is performed in the right direction in FIG. As a result, the sub-transmission is switched from high-speed four-wheel drive to low-speed four-wheel drive, and the shift position on the lever tip 17 side corresponds to the shift position L4 in FIG. 5.

With the selection operation of the shift lever 15,
When the lever tip 17 moves from the position shown by the solid line in FIG.
It functions to always push back to the position shown by the solid line in FIG. This select return spring 20
The select return force due to shift lever 15
With the shift operation, the lever tip 17 shifts to the first position.
It is always exhibited within the range of movement from the position shown by the solid line in the figure to the position shown by the imaginary line A3. As a result, the shift position of the shift lever 15 is always clear, and the shift lever 15 is aligned with the arrow B in FIG.
A situation where vibration occurs in the direction (select direction) is also prevented.

Note that the shift lever 15 is located at the tip 1 of the lever.
When the lever tip 17 is in the neutral position shown by N in FIG. 5 representing the shift position 7, the lever tip 17 is in the position shown by the imaginary line A1 in FIG. 1 and the imaginary line B1 in FIG. The middle portion 22 of the return spring 20 is defined by the imaginary line b in FIG.
It is elastically deformed as shown in . In this way, when the shift lever 15 is in the neutral position,
The lever tip 17 is pressed against the outer circumferential surface of the shift head 9 of the two-wheel/four-wheel switching fork shaft 7 by the elasticity of the select return spring 20, thereby clarifying this neutral position.

Now, as described above, the select return spring 20 is assembled into the auxiliary transmission case 1.
Before assembling the shift lever retainer 10 to the auxiliary transmission case 1, each end 21 of the select return spring 20 is engaged with the groove 4 formed in the shift lever retainer joint surface 3 of the auxiliary transmission case 1. Thereafter, by assembling the shift lever retainer 10 to the shift lever retainer joint surface 3, each of the grooves 4 described above are both closed by the shift lever retainer 10, and in this state, the select return spring 20 is connected to the auxiliary transmission. It is properly assembled and held on the case 1 side. In this way, by utilizing the assembly of the shift lever retainer 10 to the sub-transmission case 1, the assembly of the select return spring 20 is also completed at the same time.

6 and 7 show examples of different shapes of the select return spring 20,
In this embodiment, the select return spring 20
A coil portion 24 is formed between both end portions 21 and an intermediate portion 22 in place of the arm portion 23, and the select return force is obtained by the elasticity of the coil portion 24. In addition, in the embodiment shown in FIGS. 6 and 7, other structures and functions are the same as in the first embodiment.
Since this is the same as the embodiment shown in FIGS. 5 to 5, the same reference numerals are used in the drawings to omit redundant explanation.

(Effects of the invention) As described above, in this invention, the shift lever is always pushed in the predetermined selection direction by the select return spring, which makes the shift position of the shift lever clear and improves its operability. In addition to being able to prevent shift lever vibration, this select return spring can be easily assembled by using the shift lever retainer assembly to the sub-transmission case. As a result, the workability of assembling the select return device is improved, and the number of parts is reduced, so that costs can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view showing a direct control mechanism in the auxiliary transmission, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. Figure 4 is a perspective view of the select return spring;
The figure is an explanatory diagram showing the shift pattern on the lever tip side of the shift lever, FIG. 6 is a sectional view showing a different embodiment in correspondence with FIG. 1, and FIG.
It is a sectional view taken along the line - in the figure. 1...Sub-transmission case, 2...Top opening, 3
...Shift lever retainer joint surface, 4...Groove, 1
0...Shift lever retainer, 15...Shift lever, 20...Select return spring, 2
1...End of select return spring.

Claims (1)

[Scope of utility model registration request] In a direct operation type control mechanism for a sub-transmission, in which a shift lever is spherically supported for shift and select operation with respect to a shift lever retainer assembled to an upper opening of the sub-transmission case, Grooves that are closed when the shift lever retainer is assembled are formed in two locations facing each other in the shifting direction of the shift lever on the shift lever retainer joint surface around the upper opening, and A select return device of a direct operation type control mechanism in a sub-transmission, characterized in that the ends of a spring that abuts a part of the shift lever in the sub-transmission case and exerts a select return force are respectively engaged. .