JPS5821045A - Running speed change gear of work truck - Google Patents

Abstract

PURPOSE:To smoothly perform speed change operation without causing the necessity for disengaging a main clutch, by interposing plural stages of speed change mechanisms and a fluid friction clutch respectively in branch transmission systems and connecting input and output shafts through the branch transmission systems. CONSTITUTION:A speed change gear 3 is constituted to perform transmission from an input shaft 6, interlocking to an engine, to an output shaft 8 through the first or second branch transmission system 7a, 7b. The first or second branch bransmission system 7a, 7b is constituted with a pair of first and second or third and fourth synchromeshed gear speed change mechanisms 10a-10d to the first or second transmission shafts 9a, 9b in a speed changeable state of four stages, further interposed with the first or second oil hydraulic friction clutch 11a, 11b respectively in the systems. A non-transmission state in both of the branch transmission systems 7a, 7b due to appearance of a slip state of the clutches 11a, 11b, is avoided to perform switching operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traveling device for a working vehicle that is configured so that a traveling gear change operation can be performed without operating a main clutch on and off each time the gear is changed.

Conventional OH devices have separate hydraulic friction clutches installed between the transmission shaft and the transmission gears attached thereto, and are operated by sequentially or counterclockwise on/off operations of these clutches. there were.

However, as the number of gears increases, the number of hydraulic friction clutches increases, resulting in an increase in the size of the entire device.

In view of the above points, the present invention aims to reduce the number of fluid pressure friction clutches so that the gear can be changed without making a large amount of work on the main clutch, thereby configuring the device compactly. The object of the present invention is to improve the arrangement of the transmission shaft and to make the device even more compact.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

In order to drive the traveling device of a tractor as an example of a working vehicle, power from the engine (3) is used to drive the vehicle through the main clutch (or modification device LS1.1S1.1 lateral travel switching) and the differential mechanism (1). Apparatus (1) is configured to transmit K.

As shown in Fig. 1, the transmission (3) is configured by connecting a motion input shaft (·) to the engine @ through a first or first branch transmission system (7m), and an output shaft (γb). (Il
It is configured to transmit lK.

The first or first branch transmission system cγm), (7b) is the first or first transmission shaft r9m), (9b) K pair of first and first or third and third transmission shaft vx Type gear transmission mechanism (10@), (10b).

(10c) and (10d) are provided to enable one-stage speed change, and first or first hydraulic friction clutches (l1m) and (llb) as an example of a fluid pressure type are interposed respectively. There is.

titJ tg/suishi 1st IV mesh gear transmission mechanism (10s, (10b), (loc), (10d)
), as shown in Fig. 8, the V foot fork + 1m for the V anochronizer sleeve σ is connected to the electromagnetic three-position switching valve (Vl), (Vs), (Va), f.
A limit switch (Ll) which is configured to be operated by pressure oil supply through the shift fork and which detects whether the shift fork is in the shifting position on both sides of the sliding displacement direction. (Lm) is attached.

The first and first hydraulic friction clutches (l1m).

(llb) is always biased toward the switching side, and is electromagnetic for its clutches (l1m) and (llb), and.

It is configured to supply pressure oil through the second position lid switching valves ff&) and (Vl) which are blown so as to provide resistance to drained oil during the cutting operation by the restrictor flow path.

3-position switching valve Cv1), (Vs), ff5
), (Va), and a pair of solenoids (Sl), rss) to operate them...
(Ste) and (S@) are attached, and seven solenoids (Ss) and (Js・) are attached to each of the three-position switching valves (Vi) and ff5) to operate them, and the gear shift operation is performed. Shift contact ff, )~ with lever I operation fIrK
(F-), based on the command from the operation circuit (II), both clutches rl1m, rllb ) is switched from the slip transmission state to the transmission state in the other clutch.

After the switching, the predetermined gear type transmission mechanism (101) ~
(lod) to the neutral position, solenoid (Sl)
~(Sl·) is configured to be K as shown in the following table.

Table showing the relationship between speed change contacts and solenoid operating status/! Excitation state of solenoid O: Demagnetization state of solenoid In the diagram, - is the power take-off shaft, and although some illustrations are omitted, it is a gear (17 m) fitted to the input shaft (61).

rlVb), CI? c) and C17d) are configured to extract power so as to be able to change the speed.

Next, the transmission mechanism (lea), (10b), rloc
), (10d) and clutches (11-), (11k>) will be explained using an O shift from the first speed (Fl) to the first speed (yl) as an example.

In other words, only the first clutch (l1m) is in the engaged position 11, and the large diameter gear (18m) in the first shift mechanism (1Ga) K and the small diameter gear in the first shift mechanism (10b) K (18c) Only the main shaft is made to rotate integrally with the first transmission shaft (9 turtles), and the first speed ratio IIICF is obtained.
Then, as the state is switched from the O state to the third speed rFm), first, the third and third
The natural gear in K (10c) is created by excitation of the solenoids (Ss) and (Sv).
18c) and the small diameter gear C in the 1st transformation structure (10d)
I8g) Folding 1 where the husband's power rotates integrally with the No. 1 transmission shaft (9b)
11, and then the switched state is detected by the limit switches (L・) and (Lv) K, and after that, the first clutch rl1m) is turned off by demagnetizing the solenoid (8・), and the other solenoid is turned off. (
The first clutch rl1b) is engaged by excitation of Sl. 11b) becomes a transmission state,
After switching the transmission, the solenoid (81),
(Ss) is demagnetized and the first and second transmission mechanisms (10 m
), (10b) are switched to the neutral state.

Figure 4 shows the wooden tablet invention 0* embodiment, and the first transmission shaft (9
The cylindrical shaft KwI is formed, and its first transmission shaft (9m
), and insert the first transmission shaft (9b) into the first transmission shaft (is).
K 1st and 1st synchronized gear shift structure C1
ot), (10b), and a first clutch (l1m) is provided at a predetermined position of the input shaft (6), and on the other hand, a second transmission shaft (9b), a third and a fourth tV, and a V-type gear transmission mechanism. (10c), (104) and the second clutch (ll
b) are provided respectively. The timing of the speed change operation is the same as in the embodiment described in L, and the explanation thereof will be omitted.

The present invention is not limited to the case of KJrRf speed as mentioned above,
It can be applied when changing gears in q gears.

92-position switching valve ff1) equipped with a 92-position switching valve FF1).

(V.) and the aforementioned operating circuit - are collectively referred to as a mechanism that switches the clutch to the transmission state while causing the slip transmission state to appear.

In short, 1. ! The traveling transmission system for a work vehicle developed by Akira Ai uses a multi-stage V-mesh type gear shifting system that connects the input shaft (6) linked to the engine 5FytWA and the output shaft ($) to the traveling device (1), respectively. Structure (1Gm) I Ruiha (10
c) and/or side hydraulic friction clutch rl1m) or (11b) is interposed to create a nine-branch transmission line (TE@).

(7b) and the clutch (l1m)
.

(llb) is characterized by providing a mechanism for switching to a transmission state while causing a slip transmission state to appear in other clutches.

V in each of the power transmission system, branch transmission system (Gm), and (TEB)
Equipped with a black mesh gear speed mechanism (1Gm),
Transmission shaft (1m), (li+) and transmission gear (181)
Branch transmission system r7m), (
To select γb), a hydraulic friction clutch (1G@
).

(llb), its clutch (l1m), (ilb
) is transformed into a bifurcated transmission system (
7m) and (Wb) are both engaged and disengaged to avoid being in a non-transmission state, thereby making it possible to perform gear shifting operations smoothly without disconnecting and disengaging the main clutch. Compared to the case where hydraulic friction clutches (l1m) and (llb) are provided in the transmission gear hub, the number of friction clutches (ILa) and (llb) can be reduced, and multi-stage transmission can be performed smoothly and well. K is designed for compact configuration.

The traveling transmission system of the work vehicle by Takaaki Honkan 2 has an input shaft (@) linked to the engine (6) and an output shaft (8) to the traveling device (respectively), each of which has a multi-stage synchronized V. Yu type gear transmission mechanism (10m) or (10c) and /If
Hydraulic friction clutch (l1m) or (llb)
are interposed and are interlocked and connected via a hexagonal transmission system (7m) and (tek), and the clutches (l1m) and (llb) are put into a transmission state while causing a slip transmission state in the other clutches. A switching mechanism is provided, and the first transmission shaft (9a) on one side of the branch transmission system (7m), (7b) is configured as a cylindrical shaft, and the second transmission shaft (9a) of the other branch transmission system (7b) is configured as a cylindrical shaft.
fib) into the first transmission shaft (91), and the first and second transmission shafts (9g+), (9b) large K11l period V-type gear transmission mechanism (10m), rloc
) is attached.

In other words, in addition to the first invention, the first and second transmission shafts (
9m) and (91+) are configured in a double shaft shape, so both shafts (
9m) and ('9+), the installation space in the direction perpendicular to the axis direction has been increased to allow for a more compact configuration of the device.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the traveling transmission system for a working vehicle according to the present invention, and FIG. 1 is an overall schematic plan view showing the traveling transmission system;
Figure S is a view of the V-side of the sink. 11)...Travelling device, (@)...Input shaft, (7m), rγb)...Branch transmission system, (
S)...Output shaft, (91)...First transmission shaft, (9b)--No.1 transmission shaft, (1Gm), (10
c) ......Synchronized mesh gear shift 1al
11. (l1m). (llb)...Hydraulic friction clutch, @...
····engine.

Claims (1)

[Claims] ■ An input shaft (@) linked to the engine @, and a traveling device (1
) Heno output shaft +81, *4 KIE & stage vyriru is interposed with (11b) and nine-branch transmission system Ctel). (7b) and the clutch (111)
. (11%) A traveling transmission with a work rate characterized in that it is provided with a mechanism for switching to a transmission line 11 while causing a slip transmission line to appear at another O taratch. ■ The input shaft (e) linked to the engine (2) and the output shaft (1) to the traveling device: C)
and l@O fluid pressure type Masino clutch (l1m) or (l
lb) is interposed and interlocked and connected via the nine-fold mosquito transmission system (tei) e()b), - Ki Tatsuchi (11 Kaede). (1111) is provided with a clear mechanism to switch to the transmission type 111 while causing the other clutch Km to reveal a slip transmission foreshadowing, and the first The transmission shaft C91) is configured as a cylindrical shaft, and the first transmission shaft (9b) of the other branch transmission system (7b) is fitted inside the first transmission shaft (9m) K, and the first and first transmission shafts C91
), (9b) A traveling transmission device for a work vehicle, characterized in that it is equipped with a K11L V-type gear transmission mechanism (LEA) and (LOC), respectively.