JPH0674836B2 - Gear shifting operation device for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is applicable to a case where a continuously variable transmission incorporated in a vehicle transmission or the like is operated by a single shift lever.
The present invention relates to a shift operating device for a continuously variable transmission in which a forward lever system and a reverse system have different operation strokes of a shift lever for setting the same shift range.

(B) Conventional technology When a continuously variable transmission is incorporated into a vehicle transmission,
The speed can be set steplessly and the structure can be made compact.

In such a case, the same speed range will be used for both forward and reverse systems.

Therefore, the shift lever is characterized as a forward drive system and a reverse drive system to perform the same stroke movement operation.

(C) Problems to be solved by the invention However, in general vehicles, there are overwhelmingly many cases where the vehicle moves forward, and it is the forward drive system that requires fine speed setting for that purpose. In other words, for reverse speed setting, the speed change range may be small, and even if there is some inconvenience, it will be tolerated.

In order to cope with this, if the forward and reverse gear shifting structures are different, the structure becomes complicated and the cost increases.

(D) Means for Solving the Problems Therefore, the present invention is rotatable about a fulcrum shaft, and
An operation of projecting rollers on both sides of a shifter installed so as to be tiltable along the fulcrum shaft, tilting the shifter to either side, and operating the rollers on that side to shift the continuously variable transmission. The forward movement system and the reverse movement system are selected by engaging with one of two operation arms provided on the shaft with the same radius, and further, the shifter is rotated to rotate the operation arm by a predetermined angle. In the gear shifting operation device for continuously variable transmission that performs gear shifting operation, the radius of the forward roller of the two rollers from the fulcrum shaft is set to be shorter than the radius of the backward roller. The problem was solved.

(E) Action As described above, in both forward and reverse systems, when trying to shift the continuously variable transmission to the limit, the two operating arms must be rotated by the same angle, but they engage with this operating arm. By changing the radius of the shifter roller from the fulcrum axis, the operation stroke of the shifter can be made different.

In other words, if the one with the shorter radius is set as the forward movement system, this side must be moved further in order to move the operation arm that moves in cooperation with the roller by a certain angle (distance). As a result, the positioning accuracy of the shifter (and hence the gear shift lever) is improved, and fine speed setting is possible.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional side view of a gear shift operating device when the continuously variable transmission is applied to a traveling transmission device of a traveling work vehicle, FIG. 2 is a lateral sectional view of the same, FIG. 3 and FIG. 4 are shifters. FIG. 5 is a partial cross-sectional side view of a main part showing the relationship between the gear and the roller, and FIG.

First, the traveling transmission device 1 will be described. The traveling transmission device 1 transmits the power of the input shaft 2 to the left and right axles (not shown) that are the final output shafts, and the transmission in the middle of the transmission is performed. The continuously variable transmission 3 and the gear slide type forward / reverse switching device 4 are provided in the system path.

In the continuously variable transmission 3, an input disk 6 and an output disk 7 connected to an input shaft 2 and an output shaft 5, respectively, are arranged to face each other, and an umbrella-shaped rolling element called a planet cone 8 is provided on the outer circumference thereof. A planetary cone, and a ring 9 is pressed against the conical surface (outer peripheral surface) of the planet cone 8 to change the position of the ring 9 from the top of the conical surface to the hem. Use the mechanical type.

The gear slide type forward / reverse switching device 4 has a transmission gear 10 slidably fixed on an output shaft 5, and the transmission gear 10 is slid to slide the transmission gear 10 into one of the following forward and backward transmission systems. It is configured to be connected to (not shown).

Regarding these operations, the ring 9 is provided outside the apparatus 1 by the two operation arms 11a and 11b protruding laterally at an interval of about 180 °, and the transmission gear 10 is also the operation arm 12 similarly. Each of them is operated by a single shift lever 14 which is pivotally attached at its lower end and whose middle is guided by a shift guide groove 13.

That is, the speed change guide groove 13 includes two parallel speed change grooves 13a,
13b and a connecting groove 13c that connects the rear end of one of the shift grooves 13a and the front end of the other 13b in an orthogonal manner. When the shift lever 14 is guided to one of these 13a, the forward system, the other When it is guided to, the reverse system is selected, and both shift grooves 13a and 13b are set to a higher speed as they are brought to the end.

The gear shift operating device for this purpose is configured as follows.

A fulcrum shaft 15 is provided in a place slightly above the traveling transmission device 1 in parallel with the communication groove 13c, and a shifter support cylinder 17 is mounted above the fulcrum shaft 15 by a stay 16 so as to be perpendicular to the fulcrum shaft 15. The shaft part 18 of the shifter 18 is mounted on the shifter support cylinder 17.
a is rotatably fitted. The shifter 18 is shaped like an ice hockey stick from below the shaft 18a, and a pin 19 is inserted in the groove 20a of the slider 20 fitted to the fulcrum shaft 15 in the middle thereof. It is protruding so that it can be rushed.

On both sides of the shifter 18, the rotors 21a, 22a are spaced at regular intervals.
And a pair of pins 21b, 22b are provided respectively, and one of the two rollers 23, 24 of the forward system and the reverse system provided upright on the operation arms 11a, 11b of the continuously variable transmission 3 is thereby provided. To engage with. That is,
The shifter 18 tilts about its shaft portion 18a, but the rollers 2a and 22a and the pins 21b and 22b on the tilted side of the roller 2
It sandwiches 3,24. And in this state, shifter
When 18 is rotated around the fulcrum shaft 15 (the shifter 18 has a shift lever 14 added upward), the operating arms 11a and 11b which are engaged are rotated to move the ring 9. .

On the other hand, on the side of the fulcrum shaft 15 on the side opposite to the slider 20, a switching arm 25 that rotates in a vertical plane parallel to the fulcrum shaft 15 can rotate about its arm shaft 26. The pin 27 provided in the middle of the arm 25 causes the groove 20a of the slider 20 to
It is rushed in. Therefore, when the slider 20 is moved by the shifter 18, the switching arm 25 is also moved at the same time, and the operation arm 12 of the forward / reverse switching device 4 is rotated.

The above structure is housed in the frame plate 28 to form one unit, and the frame plate 28 can be attached to and removed from the traveling transmission 1.

From the above, the shift lever 14 is connected to the shift guide groove 13 through the connecting groove 13c.
If the inside is moved, the movement rotates the operation arm 12 of the forward / reverse switching device 4 to perform predetermined forward / backward switching, and
If the speed change grooves 13a, 13b are moved, the operation arms 11a, 11b of either the forward drive system or the reverse drive system of the continuously variable transmission 3 are rotated to set a predetermined speed. However, no matter which gear shift groove 13a, 13b, if the gear shift lever 13 is moved toward the end thereof, the operating arms 11a, 11b are given rotational movements in the same direction. The faster it gets, the faster it is set.

By the way, according to the present invention, the above-described advance system roller 21a is used.
The radius r1 from the fulcrum shaft 15 of the pin 21b (actually also the pin 21b) is set shorter than the radius r2 of the reverse roller 22a.

As a result, the shifter 18 (shift lever 14) is tilted to the left and right to engage with the rollers 21a and 22a and the operation arms 11a and 11b of either the forward or reverse system and the rollers 23 and 24 mounted thereto. When the gear shift lever 14 is rotated back and forth to perform a gear shift operation, if both the forward drive system and the reverse drive system try to shift to the maximum limit, both operation arms 11a,
11b must move the same stroke S. Therefore, the radius r1 of the forward drive roller 21a is set to that of the reverse drive r2.
In order to move both operation arms 11a and 11b by the same stroke S, the rotation angle A of the forward movement system of the speed change lever 14 must be made larger than the rotation angle B of the reverse movement system.

6 and 7 are side views showing the positions of the respective plugs provided in the case 29 of the traveling transmission device 1, but when the traveling transmission device 1 is used upright (see FIG. 6,
In a combine or the like, the case 29 is used in this position), and from the top to the front of the case 29, the oil supply plug 30, the oil detection plug 31, and the oil discharge plug 32 of the continuously variable transmission 3 are provided. by the way,
When it is laid down and used (see Fig. 7, it is used in this position because of the high ground height in vehicles, etc.), the oil filler plug 30 remains the same, but the oil detecting plug 31 and the oil drain plug.
If 32 is used in reverse, the positional relationship is just right. As a result, a common effect is produced, and it is possible to cope with small-lot production of multiple models.

(G) Effect of the Invention As described above, the present invention provides the shifter 18 (hence,
The radius r1 from the fulcrum shaft 15 of the forward drive roller 21a provided on the speed change lever 14) is set shorter than the radius r2 of the reverse drive roller 22a. As a result, both operation arms 11a,
In order to move 11b by the same stroke S, the rotation angle A of the forward movement system of the speed change lever 14 must be made larger than the rotation angle B of the reverse movement system.

Therefore, the positioning accuracy is better in the forward system,
It is possible to set the finer speed accordingly. In this respect, it is suitable to be applied to a combine such as a combine that requires a fine working speed.

This also means that the operating force required to operate the transmission lever 14 may be smaller in the forward drive system, which is preferable in relation to the frequency of use.

Further, since the rotation angle B of the reverse transmission gearshift lever 14 can be small, the entire operation stroke can be shortened, and there is an advantage that this portion can be made compact.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a gear shift operating device when the continuously variable transmission is applied to a traveling transmission device of a traveling work vehicle, FIG. 2 is a lateral sectional view of the same, FIG. 3 and FIG. 4 are shifters. FIG. 5 is a partial cross-sectional side view of the main part showing the relationship between the gear and the roller, FIG. 5 is a plan view showing the relationship between the shift guide groove and the shift lever, FIG.
The drawings are side views showing the positions of the respective plugs provided in the case 29 of the traveling transmission 1. (Code) 3 …… continuously variable transmission 11a …… operation arm 11b …… operation arm 15 …… fulcrum shaft 18 …… shifter 21a …… roller 22a …… roller r1 …… roller radius r2 …… roller radius

Claims (1)

[Claims] 1. Rollers (21a), (22a) are provided on both sides of a shifter (18) installed so as to be rotatable around a fulcrum shaft (15) and tiltable along the fulcrum shaft, respectively. Then, the shifter (18) is tilted to either side, and the rollers (21a) and (22a) on that side are provided with the same radius on the operation shaft for shifting the continuously variable transmission (3). The forward movement system and the reverse movement system are selected by engaging one of the two operation arms (11a) and (11b), and further, the shifter (1
(8) In the gear shifting operation device of a continuously variable transmission for rotating the operating arms (11a), (11b) by a predetermined angle to perform gear shifting operation, the two rollers (21a), (22a) The radius (r1) of the forward drive roller (21a) from the fulcrum shaft (15) is set shorter than the radius (r2) of the reverse drive roller (22a) of the continuously variable transmission. Gear change operation device.