JP3173630B2 - Speed change operation structure of differential planetary gear type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change operation structure of a continuously variable transmission with a differential planetary mechanism.

[0002]

2. Description of the Related Art In a traveling work vehicle such as a combine or the like, a continuously variable transmission called a differential planetary mechanism type is sometimes used in order to obtain a continuously variable transmission speed. FIG. 5 is a cross-sectional view of the transmission showing an example of the transmission, in which a plurality of umbrella-shaped planetary cones 10 are planetarily arranged and connected to an input disk 14 connected to an input shaft 12 and an output shaft 16. The output disk 18 is pressed against and opposed to the output disk 18. Then, the outer peripheral surface of the planetary cone 10 is slidably contacted with the transmission ring 20 so as to be able to move from the skirt to the top.

When a driving force is supplied to the input shaft 12, the planetary cone 10 revolves while rotating and the output shaft 1 revolves.
6, a certain differential relationship occurs between the input disk 14, the output disk 18 and the planetary cone 10 depending on the position of the transmission ring 20, and the output shaft / input shaft rotation speed is reduced. Change. The output shaft / input shaft speed is the speed change ring 2
0 is lower as the outer peripheral surface of the planetary cone 10 is located at the bottom of the planetary cone 10, and the transmission mechanism 2 moves the shifter 22 holding the transmission ring 20 by rotating the transmission arm 24.
Perform in step 6.

Incidentally, depending on the type of traveling work vehicle, the transmission mechanism 26 itself may not be able to be set as the transmission operation member 30 including the transmission lever 28 or the like. Because,
This is because the speed change operation member 30 must be disposed near the cockpit, and the speed change mechanism 26 must be attached to a transmission inserted into the axle. FIG. 6 is a plan view showing the relationship between the speed change operation member 30 and the speed change mechanism 26 in such a case. In such a case, the speed change mechanism 26 and the speed change operation member 30 are connected by a connecting member 32 such as a rod. connect.

[0005]

On the other hand, in such a differential planetary gear type continuously variable transmission, the operating load is increased as the speed change ring 20 is moved from the low speed (L) side to the high speed (H) side. There are mechanical characteristics. FIG. 7 shows the characteristics of the relationship between the position of the shift lever 28 and the operating load, where a is the required operating load specific to the differential planetary gear type continuously variable transmission.
b is an operating force generated by the gearshift lever 28 that makes an arc movement. It can be seen that c, which is a combination of the two, is the actual operation load, but increases dramatically when the speed change lever 28 is at high speed.

In order to improve this, there is a method in which the lever ratio of the shift lever 28 is considered. FIG. 8 is an explanatory view of such a case. In this case, the operation ratio c is reduced by arranging the transmission lever 28 such that the lever ratio becomes more advantageous as the speed increases. However, even in this case, the operation load c is slightly reduced, and the swing range of the connecting member 32 is increased, which may cause interference with an adjacent member. The present invention solves such a problem,
In short, the speed change operation member incorporates an operation force variation mechanism in which the operation force is increased as the speed increases.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a speed-change operating member for a speed-change operating member by sliding a speed-change ring on an outer peripheral surface of a planetary cone arranged in a planetary manner in association with an input shaft and an output shaft. A shift operation structure of a differential planetary gear type continuously variable transmission that continuously varies an output shaft / input shaft rotation speed by moving a transmission ring across a skirt portion and a top portion of an outer peripheral surface of a planetary cone by operation. The speed change operation member and the speed change ring mesh with each other, which generates an increased operation force as the speed increases.
It is an object of the present invention to provide a speed change operation structure of a differential planetary gear type continuously variable transmission characterized by incorporating an operation force fluctuation mechanism having a pair of different diameter gears that mesh with each other .

[0008]

By taking the above measures, when the speed change operation member is shifted to the high speed side, the operation force is increased by the operation force fluctuation mechanism having a pair of different diameter gears. The operation load is largely offset by the required operation load that greatly increases on the high-speed side, so that the operation load does not change much over the entire moving range.

[0009]

FIG. 1 is a plan view showing the relationship between the speed change operation member 30 and the speed change mechanism 26 according to the present invention. The operation in which the operation force is increased on the speed change operation member 30 as it shifts to a higher speed side. The force variation mechanism 34 is incorporated. As an example of the operation force varying mechanism 34, a rotating arm 38
This was to be able to rotate about the support shaft 36 by connecting, it is conceivable to mount by engaging the pair of different-diameter gear 42, 44 between the support shaft 40 of the spindle 36 and the shift lever 28. The different diameter gears 42 and 44 are set such that the rotational speed transmitted to the rotating arm 38 is reduced as the shift lever 28 is shifted to the higher speed side.

If the operating force of the shift lever 28 is F, the lever length is S, the tangential force of the different diameter gear 44 attached to the shift lever 28 is W, and the length to the point of application is R, The contact force becomes W = FS / R, and it can be seen that the smaller the R, that is, the more the shift lever 28 moves to the higher speed side, the larger the tangential force (operating force) is generated. FIG. 2 shows the characteristics of the relationship between the position of the shift lever 28 and the operation load in this case. It can be seen that even if the shift lever 28 is moved to a higher speed side, the required operation load c does not increase so much. Note that the present invention can be applied even when the transmission mechanism 26 and the transmission operation member 30 are integrated and the connecting member 32 is not provided.

FIG. 3 is a plan view showing another example of the arrangement of the different diameter gears 42 and 44. When the speed change lever 28 is provided so as to straddle the two different diameter gears 42 and 44, as shown in FIG. The lever length can be increased without requiring much extra space, and the operating load is further reduced. In addition, the above different diameter gear 4
Reference numerals 2 and 44 denote examples of the operation force variation mechanism 34, which may be a cam, a link, or the like.

FIG. 4 is a perspective view of a combine provided with such a shift operation structure, in which a converter 46 for converting sunlight into electric energy is attached to an upper surface or the like. In this case, the fan can be turned on using the electric energy converted by the converter 46, and the cockpit can be air-conditioned by taking in the sunlight as a heat source.
A useful effect peculiar to the combine, that is, drying the threshing room, can be expected.

[0013]

As described above, according to the present invention, the operation load of the shift lever characteristic of the differential planetary gear type continuously variable transmission, which becomes heavier at higher speeds, can be uniformed from low speed to high speed, thereby improving operability. it is Ru can.

[Brief description of the drawings]

FIG. 1 is a plan view showing a shift operation structure of a differential planetary gear type continuously variable transmission according to an embodiment of the present invention.

FIG. 2 is a characteristic showing a relationship between a shift lever and an operation load in a shift operation structure of a differential planetary gear type continuously variable transmission according to an embodiment of the present invention.

FIG. 3 is a partial plan view showing a shift operation structure of a differential planetary gear type continuously variable transmission according to another embodiment of the present invention.

FIG. 4 is a perspective view of a combine provided with a shift operation structure of the differential planetary gear type continuously variable transmission according to the embodiment of the present invention.

FIG. 5 is a sectional view of a transmission of a traveling work vehicle in which the differential planetary gear type continuously variable transmission is incorporated.

FIG. 6 is a plan view showing a shift operation structure of a conventional differential planetary gear type continuously variable transmission.

FIG. 7 is a characteristic showing a relationship between a shift lever and an operation load in a shift operation structure of a conventional differential planetary gear type continuously variable transmission.

FIG. 8 is an explanatory view showing a shift operation structure of a conventional differential planetary gear type continuously variable transmission.

[Explanation of symbols]

 Reference Signs List 10 planetary cone 12 input shaft 16 output shaft 20 speed change ring 30 speed change operation member 34 operation force fluctuation mechanism

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 61/26-61/36 F16H 63/00-63/38 B60K 20/00-20/08 F16H 59 / 00-59/12 G05G 1/00-25/04

Claims (1)

(57) [Claims] 1. A transmission ring is slidably contacted with an outer peripheral surface of a planetary cone arranged in a planetary manner in association with an input shaft and an output shaft, and the transmission ring is brought into contact with a skirt of an outer peripheral surface of the planetary cone by operating a transmission operation member. In the speed change operation structure of the differential planetary gear type continuously variable transmission that continuously changes the speed of the output shaft / input shaft by moving over the top portion, the speed is shifted to the high speed side between the speed change operation member and the speed change ring. A shift operation structure of a differential planetary gear type continuously variable transmission, characterized by incorporating an operation force fluctuation mechanism having a pair of different-diameter gears meshing with each other to generate an operation force that is increased as much as possible.