JPS62159849A - Speed change operation device for continuously variable transmission - Google Patents

Abstract

PURPOSE:To improve the positioning precision of a shifter by making different the operation stroke of the shifter by making different the radius of depart from the fulcrum shaft of a roller of the shifter engaged with an operating arm. CONSTITUTION:The radius r1 from a fulcrum shaft 15 of a roller 21a in an advance system is set shorter than the radius r2 of a roller 22a in a retreat system. Therefore, when speed change operation is performed by turning a speed change lever 14 forward and rearward, if speed change is to be performed in both of the advance and retreat systems to the full limit, the both operating arms 11a and 11b shall be moved by the equal stroke S. Therefore, since the radius r1 of the roller 21a in the advance system is set shorter than the radius r2 in the retreat system, the turning angle A in the advance system of the speed change lever 14 shall be increased, and the positioning precision of a shifter is improved.

Description

[Detailed description of the invention] (a) Industrial application field This invention is applicable to cases where a continuously variable transmission incorporated in a vehicle transmission or the like is operated with a single gear shift lever.
This invention relates to a shift operation device for a continuously variable transmission in which the operating stroke of a shift lever is different between a forward system and a reverse system even though the same shift range is set.

(b) Conventional technology When a continuously variable transmission is incorporated into a vehicle's transmission,
The speed can be set infinitely, and the structure is also compact.

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

Therefore, the shift lever is characterized as a forward system and a reverse system, and the same stroke movement operation is performed for each.

(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 system that requires detailed speed settings. In other words, when setting the speed of the reverse system, a small shift range is sufficient.

Moreover, even slight inconveniences are tolerated.

In order to deal with this, if the transmission structures for the forward and reverse systems are made different, the structure becomes more complicated and the cost increases.

(d) Means for Solving the Problems Therefore, the present invention provides a device that is rotatable around a fulcrum shaft and that
An operation in which rollers are provided protruding from both sides of a shifter that is installed so as to be tiltable along this fulcrum axis, and the shifter is tilted to either side and the rollers on that side are used to operate the continuously variable transmission. A forward drive system and a reverse drive system are selected by engaging one of two operating arms provided on the shaft with the same radius, and the shifter is further rotated to rotate the operating arm by a predetermined angle. In a speed change operation device for a continuously variable transmission that performs a speed change operation, the radius from the fulcrum shaft of the forward system roller of the two rollers is set shorter than the radius of the reverse system roller, thereby achieving the above-mentioned effect. It solved the problem.

(E) Effect As a result of the above, in order to shift the continuously variable transmission to its maximum limit in both the forward and reverse systems, each of the two operating arms must be rotated by the same angle; By changing the radius of the shifter roller from the fulcrum axis, the shifter operation stroke can be made different.

In other words, if you set the roller with the shorter radius to be the forward movement system, then in order to move the operating arm that moves in conjunction with the roller by a certain angle (distance), you will have to move this side further. This increases the positioning accuracy of the shifter (and therefore the gear lever), allowing for more precise speed settings.

(F) Examples Examples of the present invention will be described below with reference to the drawings.
Fig. 1 is a partially sectional side view of a gear shift operation device when this continuously variable transmission is applied to a traveling transmission device of a traveling work vehicle, Fig. 2 is a cross-sectional view of the same, and Figs. 3 and 4 are a shifter. FIG. 5 is a partially sectional side view of the main part showing the relationship between the gear shift guide groove and the gear shift lever, and FIG. 5 is a plan view showing the relationship between the shift guide groove and the shift lever.

First, the traveling transmission device 1 will be explained. This traveling transmission device 1 transmits the power of the input shaft 2 to the left and right axles (not shown), which are the final output shafts. The system includes this continuously variable transmission 3 and a gear slide type forward/reverse switching device 4.

The continuously variable transmission 3 has an input disk 6 and an output disk 7 connected to the input shaft 2 and the output shaft 5, respectively, arranged opposite each other, and an umbrella-shaped transfer element called a planetary cone 8 on the outer circumference of these disks. A ring 9 is pressed against the conical surface (outer circumferential surface) of this '& star cone 8, and the position of this ring 9 is adjusted to a circle 5.
Shifting is obtained by changing from the top of the ff1 side to the bottom. A differential planetary 1m structure type is used.

The gear slide type forward/reverse switching device 4 has a transmission gear 10 slidably and securely fitted onto the output shaft 5, and this transmission gear 10 is slid to select either the forward or reverse transmission system as described below. (not shown above).

In addition, in these operations, the ring 9 is operated by two operation arms 11a and 11b which protrude laterally at an interval of approximately 180 degrees from the outside of the device 1, and also by the transmission gear 10.
Similarly, the gear shift lever 14 is operated by the operating arm 12, but this is done by a single shift lever 14 whose lower end is pivotally mounted and whose midway portion is guided by a shift guide groove 13.

That is, the speed change guide groove 13 has two parallel speed change grooves 1.
3a, 13b, and a communication groove 13c that orthogonally connects the rear end of one of the transmission grooves 13a and the front end of the other 13b.
When the shift lever 14 is guided to one of these grooves 13a, the forward system is selected, and when the gear lever 14 is guided to the other, the reverse system is selected. It is set to high speed.

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

A fulcrum shaft 15 is provided in parallel with the communication groove 13c at a location slightly above the traveling transmission l, and the shifter support cylinder 17 is connected to the fulcrum shaft 15 by a stay 16 above the fulcrum shaft 15.
The shaft portion 18a of the shifter 18 is rotatably fitted into the shifter support cylinder 17. The shifter 18 has a shape similar to an ice hockey stick from the shaft portion 18a downward, and a pin 19 is inserted in the middle of the slider 2 which is fitted into the fulcrum shaft 15.
It protrudes so that it can be inserted into 120a of 0.

On both sides of the shifter 18, rollers 21a are provided at regular intervals.
, 22a and pins 21b, 22b are provided, respectively, so that the operating arm 1 of the continuously variable transmission 3
It is adapted to engage with one of two rollers 23, 24, one for the forward movement system and the other for the reverse movement system, which are provided upright on 1a and 11b. That is, the shifter 18 is tilted around its shaft portion 18a, but the roller 21 on the tilted side
The rollers 23 and 24 are sandwiched between the pins 21b and 22b. And in this state,
If the shifter 18 is rotated around the fulcrum shaft 15 (shifter 1
8 has a gear change lever 14 attached above), and the ring 9 is moved by rotating the engaged operating arms 11a and 11b.

On the other hand, on the side of the fulcrum shaft 15 opposite to the slider 20,
Switching arm 25 rotating in a vertical plane parallel to the fulcrum axis 15
can rotate about its arm shaft 26, and a pin 27 provided midway through the switching arm 25 is inserted into the groove 2Oa of the slider 20. Therefore, when the slider 20 is moved by the shifter 18, the switching arm 25 is also moved at the same time, and the forward/reverse switching device 4
The operating arm 12 is rotated.

Note that nine or more components are 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 device 1 together.

As described above, when the shift lever 14 is moved in the communication groove 13c of the shift guide groove 13, the movement rotates the operating arm 12 of the forward/reverse switching device 4 to perform a predetermined forward/backward switching, and By moving the arms 13a and 13b, the operating arms 11a and 11b of either the forward or reverse system of the continuously variable transmission 3 are rotated to set a predetermined speed. However, no matter which gear shift groove 13a or 13b there is, if the shift lever 13 is moved toward the end thereof, the operating arms 11a and 11b are rotated in the same direction. The higher the speed, the faster the speed is set.

By the way, this invention is based on the above-mentioned advancement system roller 21a.
Radius r1 from the fulcrum shaft 15 (actually also the pin 21b)
is set to be shorter than the radius r2 of the reverse roller 22a.

As a result, the shifter 18 (speed lever 14) is tilted left and right to engage the respective rollers 21a and 22a with the operating arms 11a and 11b of either the forward or reverse system and the rollers 23 and 24 installed therein. Furthermore, when attempting to change gears by rotating the shift lever 14 back and forth, if both the forward and reverse systems are to be shifted to their full limits, the operating arms 11a and 11b must move by the same stroke S. It won't happen. Therefore, by making the radius r1 of the forward system roller 21a shorter than that of the reverse system r2, in order to move both operating arms 11a and 11b by the same stroke S, the rotation angle A of the forward system of the speed change lever 14 must be changed. must be larger than the rotation angle B of the reverse system.

Note that FIGS. 6 and 7 are side views showing the positions of each company installed in the case 29 of this traveling transmission device l,
When this traveling transmission device 1 is used in an upright position (see Fig. 6, it is used in this position in combine harvesters, etc.), case 2
Continuously variable transmission 3 from the upper surface of 9 to the front
Fuel tap 30. An oil check plug 31 and an oil drain plug 32 are provided. By the way, when this is used in a lying position (see Figure 7, this is the position used in transportation vehicles etc. due to the need for high ground clearance), the fuel tap 30 remains as it is, but the oil check tap 31 and drain If the oil plug 32 is used in the opposite direction, the positional relationship will be just right. This creates a common use effect and can handle small-volume production of multiple models.

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

Therefore, the forward system has better positioning accuracy,
This allows for more precise speed settings. In this respect, it is suitable for applications such as combine harvesters that require fine working speeds.

Furthermore, this means that the force required to operate the shift lever 14 is smaller in the forward type, which is preferable in terms of the frequency of use.

Furthermore, since the rotation angle B of the reverse gear shift lever 14 only needs to be small, the overall operation stroke can be made small, which has the advantage of making this part more compact.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of a gear shift operation device when this continuously variable transmission is applied to a traveling transmission device of a traveling work vehicle, Fig. 2 is a cross-sectional view of the same, and Figs. 3 and 4 are a shifter. FIG. 5 is a partial cross-sectional side view of the main part showing the relationship between the shift guide groove and the shift lever, FIG. 5 is a plan view showing the relationship between the shift guide groove and the shift lever, and FIGS.
The figures are side views showing the positions of various companies provided in the case 29 of this traveling transmission device 1. (Symbol) 3... Continuously variable transmission 11a... Operating arm 11b... Operating arm 15... Fulcrum shaft 18... Shifter 21a... Roller 22a... Roller rl... Roller radius r2... Roller radius patent Applicant Seirei Kogyo Co., Ltd. Agent Patent Attorney Yoshio Itano Figure 5

Claims (1)

[Claims] Rollers (21a) and (22a) are provided protruding from both sides of a shifter (18) which is installed to be rotatable around a fulcrum shaft (15) and tiltable along this fulcrum shaft, and this shifter ( 18) to either side, and the rollers (21a) and (22a) on that side are connected to the continuously variable transmission (3).
The shifter (18 ) to rotate the operating arm (11a
), (11b) are rotated by a predetermined angle to perform a speed change operation.
21a) and (22a), the advancing roller (21a)
), the radius (r1) from the fulcrum shaft (15) is set to be shorter than the radius (r2) of the reverse roller (22a).