JPH0448354Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a speed change operation device for various moving work vehicles.

(b) Conventional technology Traveling work vehicles require a change in vehicle speed and a forward/backward switching device, so they are each equipped with a transmission device and a forward/backward switching device (sometimes housed in the same box). , each operating member is normally operated using a dedicated operating lever or the like.

(c) Problems to be solved by the invention However, according to this method, there are two operating levers involved, which requires space for installation and is complicated to operate. To solve this,
There is also a so-called monolever system in which two levers are combined into one, but this makes the structure complicated and may even be difficult to operate. In particular, if the transmission is a continuously variable transmission (differential planetary mechanism type) in which a push force is applied to the operating member toward a lower speed when the gear is changed, the operating member may have a locking mechanism. is required, making the structure even more complex.

(d) Means for solving the problem Therefore, this invention uses a shift lever to switch the shift operating member of the forward/reverse switching device that exerts a pushing force toward the low speed side of the transmission of the traveling work vehicle. In a speed change operation device for a traveling work vehicle that is operated by a lever, the speed change lever is configured to be rotatable in the front and back direction, and a notch plate with a number of notches is provided in the rotation path thereof. A pin that can be inserted into this notch is provided protrudingly, and the switching lever is linked to allow independent rotation in the left and right direction near the middle of this gear shifting lever, forming a single gear shifting lever. The above-mentioned problems have been solved by providing a speed change operation device for a traveling work vehicle, which is characterized in that the speed change operation member and the switching operation member are actuated by the front and rear and left and right rotations of the vehicle.

(E) Effect As described above, the operating directions of the gear shift lever and the switching lever are set to the front and back direction and the left and right direction, respectively, and by linking and integrating the two, a monolever with a simple structure and good operability can be obtained. .

(F) Embodiment An embodiment of this invention will be described below with reference to the drawings. Fig. 1 is a side view of a traveling work vehicle (snow blower) incorporating this transmission, and Fig. 2 shows the main parts of the same. The rear view, FIG. 3 is a cross-sectional view taken from FIG. 2, and FIG. 4 is a cross-sectional view taken from FIG. 2.

The traveling work vehicle uses an engine (not shown) installed in the main body 1 as a power source to drive a transmission 2 and a forward/reverse switching device 3, and transmits the output to a traveling section 4 to travel. By the way, the transmission 2 has various structures such as a stepless type and a stepped type. In this case, a differential planetary mechanism type stepless type is adopted, and the speed change operation member (shift rod) 5 Continuously variable speed is possible by push/pull operation. The forward/reverse switching device 3 employs a gear switching type, and in this case as well, the switching operation can be performed by rotating the switching operation member (switching arm) 6.

Both of the above devices 2 and 3 are operated by the following speed change operation device, which is configured as follows.

First, regarding the transmission 2, a gear shift lever 8 is provided which rotates in the front-rear direction around a lower horizontal pin 7, and the shift operation member 5 described above is attached to the gear shift lever 8 via an extension rod 9. wear. Next, regarding the forward/reverse switching device 3, the switching operation member 6 described above is pivotally connected via an engagement arm 11 and an intermediate rod 12 to a switching lever 10 which is rotatable in left and right directions. In this case, a sleeve 13 is provided near the middle of the gear shift lever 8, and a pin 14 provided in the switching lever 10 is provided within this sleeve 13.
By inserting the levers 8 and 10, both levers 8 and 10 are integrated.
One gear changeover lever 15 is provided. The upper part of the speed change lever 15 is inserted into a guide groove 17 provided on the operation panel 16, and
It moves according to the shape of 7 (second
(See Figure 3). On the other hand, by making the transmission 3 the above-mentioned differential planetary mechanism continuously variable transmission type,
When the operating member 5 and the gear shift lever 8 are operated to the high speed side, a force acts to return them to the low speed side, so it is necessary to lightly lock the gear shift lever 8, etc. In this case, the gear shift lever 8 is attached to the pin 18. is installed horizontally, and this pin 18 is inserted into a predetermined notch 2 of a notch plate 19 provided along the rotation range of the gear shift lever 8.
This is possible by inserting it into 0 (see Figures 1 and 2).

(g) Effects of the invention As described above, this invention is different from the conventional one in which the transmission 3 and the forward/reverse switching device 4 were operated by dedicated operation levers, but now can be operated with a single transmission switching lever 15. Can be manipulated. The structure for this purpose is simply to integrate the switching lever 10, which moves in the left-right direction, using the sleeve 13 and pin 14 around the middle of the gear shift lever 8, which moves in the front-rear direction. 15 can be moved back and forth, left and right, and there is no change in operation (no complications or difficulties arise).

Furthermore, this makes the structure simple, and
Since both the levers 8 and 10 are provided close to each other, the installation space for them can be small in the front and rear and left and right directions. Therefore, it is optimal for this type of small-sized traveling work vehicle.

[Brief explanation of drawings]

Figure 1 is a side view of a traveling work vehicle (snow blower) incorporating this transmission, Figure 2 is a rear view of the main parts,
FIG. 3 is a cross-sectional view taken from FIG. 2, and FIG. 4 is a cross-sectional view taken from FIG. 2. Code, 2... Transmission device, 3... Forward/forward switching device, 5... Speed change operating member, 6... Switching operating member,
8...Speed lever, 10...Switching lever, 15...
...Speed change lever.

Claims (1)

[Scope of utility model registration request] A shift operation of a traveling work vehicle in which the shift operation member 5 of the transmission 2 of the traveling work vehicle, which exerts a pushing force to the lower speed side, is operated by the shift lever 8, and the switching operation member 6 of the forward/reverse switching device 3 is operated by the switching lever 10. In the device, the gear shift lever 8 is configured to be rotatable in the front-rear direction, and a notch plate 19 is provided in which a plurality of notches 20 are formed in the rotation path thereof. A pin 18 is provided protrudingly provided, and the switching lever 10 is connected to the center of the shift lever 8 so as to allow independent rotation in the left and right direction, forming a single shift switching lever 15. A speed change operation device for a traveling work vehicle, characterized in that the speed change operation member 5 and the switching operation member 6 are actuated by the front and back and left and right rotations of the .