JPH0425666A - Structure of the control unit of continuously variable transmission - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating section of a continuously variable transmission whose speed changes continuously, such as an H3T (hydraulic continuously variable transmission).

[Prior Art] A power vehicle for transporting agricultural work has been developed which is equipped with an H5T as an auxiliary transmission. If you change gears with this H3T, the traveling speed will change continuously from forward to reverse with a neutral position in between, so if you perform the appropriate operation, the traveling speed will increase or decrease smoothly, and the desired speed will be accurately adjusted. It has the advantage of being adjustable.

[Problems to be Solved by the Invention] However, on the other hand, it is difficult to perceive the position of the speed adjustment lever by hand, and the user has to rely visually to determine the running speed, so it is difficult to determine the running speed depending on the current situation. In some cases, the timing of acceleration/deceleration may be incorrect.

[Means for Solving the Problems] Therefore, in order to solve the above problems, the present invention has the following configuration.

That is, the structure of the operation part of the non-permanent transmission according to the present invention sets a predetermined boundary speed within the speed adjustment range in the non-permanent transmission which can continuously change the speed from forward to reverse by lever operation. The present invention is characterized in that a boundary speed sensing means is provided that allows the user to perceive the difference between a low speed side and a high speed side with respect to the boundary speed by the sensation of a hand operating a speed adjustment lever.

[Function] When operating the speed adjustment lever, a boundary speed sensing means is provided that allows the user to sense whether the speed is lower or higher than a predetermined boundary speed with the sense of the hand. For example, the lower speed side than the boundary speed is suitable for planting, and the higher speed side is suitable for the road. By setting the boundary speed so that the road speed is suitable for driving, it is possible to easily select and maintain a speed suitable for the current situation at all times.

[Example] An embodiment shown in one drawing will be described below.

Figure 6 shows an example of a vehicle body for transporting agricultural work equipped with H5T.
A working machine part 4 for rice transplanting is attached to the machine, and a fertilizing device M5 is also installed separately from the working machine part, and the whole is used as a fertilizing rice transplanting machine. The rotational power of the engine 10 is shifted through the H5T11, and then the transmission case 12
can be conveyed to. Furthermore, change gears here,
The running output is transmitted to the front wheel axle and the rear wheel axle, and the driving output is transmitted to the front wheel 14.
14 and the rear wheels 15 and 15, and the working output is transmitted to the rice transplanting machine part 4 and the fertilizing device 5 via the planting PTO shaft 17 and the fertilizing PTO shaft 18.

Figure 7 is the hydraulic circuit diagram of H3T, and 20 in Figure 1 is the input shaft.
21 is a hydraulic pump, 22 is a charge pump, 23 is a control valve, 24 is an unload valve, 25 is a hydraulic motor, and 26 is an output shaft. The rotational power input to the input shaft 20 is changed to a predetermined gear ratio by the action of oil pressure and output to the output shaft 26 . The rotation direction and gear ratio of the output shaft 26 are adjusted by changing the swash plate angle of the hydraulic pump 21. The swash plate is operated using the speed adjustment lever 27.

As shown in FIG. 1, the operating section 28 of the H5T is provided with a linear guide groove 30 in the front-rear direction, and the speed adjustment lever 27 is rotated along this guide groove. When the speed adjustment lever 27 is located at the center of the guide groove 30, it is neutral N.

When the vehicle is located ahead of this point, the vehicle is moving forward F, and when it is located behind this location, the vehicle is moving backwards B. In forward movement F and reverse movement B, the speed changes in proportion to the amount of rotation of the speed adjustment lever 27 from the neutral position N. Further, predetermined boundary speeds s, s2 are set for the forward movement F and the backward movement B, and a leaf spring 31 is provided to protrude into the guide groove 30 from the position of the boundary speed Sl to the position of the boundary speed S2. The tension of the leaf spring 31 is such that when the speed adjustment lever 27 comes into contact with the lever, the hand operating the lever will feel sufficient resistance, and the speed adjustment lever 27 will not forcefully move within the range of action of the leaf spring 31. Boundary speed S1 to boundary speed S that can be moved easily
The range up to 2 is a working speed suitable for working in the field, and the range higher than this is a road running speed suitable for driving on the road. These boundary speeds s,, s2 are set to appropriate values according to the actual situation.Since planting work is not performed in reverse B, the leaf spring 31 is set so that the boundary speed S2 matches the neutral N. This operation section 28(A) may be provided with
In this case, the leaf spring 31 serves as a sensing means for perceiving the boundary speed with the sensation of the hand operating the lever. Appropriate resistance may be applied to the speed adjustment lever 27 using a resistance member other than a leaf spring.

2 and 3 show examples of different operating sections, and these operating sections 2g (B, C) have guide grooves 3
0 is bent to shift the shift line of the speed adjustment lever 27 at the boundary speeds sl and s2. By shifting the shift line in this way, the boundary speed can be easily perceived by hand. Furthermore, if the shift line is shifted, the speed adjustment lever 27 will inevitably be temporarily stopped at the boundary speed position, which has the effect of preventing over-operation of the speed adjustment lever 27. Note that the shift line for on-road speed and reverse speed may be the same as in the operation section 28 (B), or the shift line for on-road speed and reverse speed may be different as in operation section 28 (C). You can leave it as is.

Further, FIGS. 4 and 5 both show different examples, and these operating units 28 (D, E) are configured to change the shift line and the method of using the above-mentioned resistance member (plate spring) as a means of sensing the boundary speed. In other words, the operating section 28 (D) has a shift line changed at the neutral N position, and plate springs 33 and 34 are provided in the high speed range of forward F and the entire range of reverse B, respectively. Therefore, the movement resistance of the speed adjustment lever 27 is small at planting speed, and large at road running speed and reverse movement.
In E), the shift line has been changed at the neutral N position, and leaf spring 3 is installed in the forward F range except for toe 7 (F6).
5, and a leaf spring 36 is provided in the entire area of the reverse B. Since the vehicle normally travels forward, the leaf spring 35 is installed in order to make the resistance by the leaf spring 35 greater than the resistance by the leaf spring 36. The protrusion amount Wl is smaller than the protrusion amount W2 of the leaf spring 36. This operation section 28 (E
), the boundary velocity s1. s2 is set to forward top (F6) and neutral N, which do not match the working speed range.

[Effects of the Invention] As explained above, the structure of the operating section of the continuously variable transmission according to the present invention allows the arbitrarily set boundary speed to be perceived by the sensation of the hand operating the speed adjustment lever. ,
For example, if the present invention is adopted in the operating section of a continuously variable transmission installed in a running vehicle for horizontal agricultural work,
By appropriately setting the boundary speed, it is possible to reliably travel within the working speed range suitable for the work when working, and within the suitable road running speed range when driving on the road.

[Brief explanation of drawings]

1 to 5 are detailed explanatory views of the present invention, FIG. 6 is a side view showing the state of use of the traveling vehicle body, and FIG. 7 is a hydraulic circuit diagram of the H3T. 2... Traveling vehicle body, 4... Work equipment part, lO... Engine, ti... H3T, 12... Mission case, 27... Speed adjustment lever, 28... Operating unit, 3
0... Guide groove, 31.33, 34, 35.36...
- Leaf spring (boundary velocity perception means).

Claims (1)

[Claims] (1) In a continuously variable transmission device that can continuously change speed from forward to reverse by operating a lever, a predetermined boundary speed is set within the speed adjustment range, and a distinction is made between low speed and high speed with respect to the boundary speed. 1. A structure of an operating section of a continuously variable transmission device, characterized in that a boundary speed sensing means is provided for perceiving the speed with the sensation of a hand operating a speed adjustment lever.