JPH0725272B2 - Vehicle transmission - Google Patents

Description

The present invention relates to a vehicular transmission, and is used for a tractor and the like.

(Prior Art) A vehicle transmission that transmits the power of an engine to a power shift transmission via a propulsion shaft and to the traveling system gear transmission and the PTO system gear transmission via the power shift transmission, For example, Jikkou Sho 61-14
Known in Japanese Patent Publication No. 688 and Japanese Examined Patent Publication No. 62-18369, in both cases, the engine power is intermittently conducted to the traveling system propulsion shaft via the dry main clutch and is intermittently transmitted to the PTO system propulsion shaft via the hydraulic clutch. It was something to conduct.

(Problems to be Solved by the Invention) By the way, in all of the conventional techniques, a dry clutch is used as a main clutch, so that the structure is complicated and the cost is high.

In addition, since a hydraulic clutch is also used for the PTO system propulsion shaft, the structure is complicated and the cost is high.If this hydraulic clutch is not used, the operation to turn the main clutch on and off when shifting the PTO system transmission is performed. Was needed.

An object of the present invention is to make the traveling system and the PTO system capable of shifting without using the main clutch and the hydraulic clutch.

(Means for Solving the Problems) According to the present invention, the power of the engine 2 is transmitted to the power shift transmission 10 via the propulsion shaft 7, and the traveling system gear transmission 25 and the transmission gear transmission 25 are also transmitted via the power shift transmission 10. In a vehicle transmission that is transmitted to the PTO gear transmission 32, the following technical measures are taken to achieve the above-mentioned object.

That is, according to the present invention, the propulsion shaft 7 is directly connected to the engine 2, the propulsion shaft 7 is used as an input shaft of the power shift transmission 10, and the transmission shaft is installed in parallel with the input shaft 7.
12 is an output shaft of the power shift transmission 10, a power shift transmission is provided on the output shaft 12, and the traveling system gear transmission 25 is disposed on the output side of the power shift transmission 10. Reference numeral 25 denotes a transmission shaft 27 provided coaxially with the output shaft 12 of the power shift transmission 10, and a transmission auxiliary shaft provided coaxially with the propulsion shaft 7 which is an input shaft of the power shift transmission 10. 29 and gear shift gear groups 26, 28 are provided, and the shift auxiliary shaft 29 has a hollow shaft structure, in which the propulsion shaft 45 of the PTO gear transmission 32 is inserted and provided, A gear transmission device extending between the propulsion shaft 45 and the speed change shaft 27.
46 is provided, and an on / off member 50 for turning on / off power to the propulsion shaft 45 of the PTO gear transmission 32 through the gear transmission 46 is provided.

(Operation) The power of the engine 2 is transmitted to the power shift transmission 10 via the propulsion shaft 7.

By keeping the power shift transmission 10 neutral,
A so-called half-clutch is formed, and the traveling system transmission 25 is shifted in this state, and the power shift transmission 10 is connected to either forward rotation, reverse rotation, or high or low, and is transmitted to the traveling system transmission 25.

The PTO system transmission 32 is transmitted by a gear transmission 46 through an on / off operation of an on / off member 50.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 3, reference numeral 1 denotes a tractor vehicle body, which is formed by connecting an engine 2, a flywheel housing 3, and first to third mission cases 4, 5, and 6 in series.

Reference numeral 7 denotes a propulsion shaft, the front side of which is directly connected to the engine 2, that is, the flywheel 9 via a buffer 8, and the rear side of which is supported by the first transmission case 4 by bearings 9.

Reference numeral 10 denotes a power shift transmission, which is built in the first mission case 4 below the propulsion shaft 7.

The power shift transmission 10 includes a bearing 11 as shown in FIG.
A power housing 1 that is supported by the power transmission shaft 12 and a piston 13 and 14 that are fixed to the transmission shaft 12 and that are mounted back to back.
5, gears 16 and 17 rotatably fitted on the transmission shaft 12 in the front and rear of the housing 15, clutch plates 18 and 19, and the like, and the pistons 13 and 14 against the springs 20 and 21 Pressure (hydraulic pressure)
The clutch plates 18 and 19 are pressed against each other by operating
The gears 16 and 17 and the transmission shaft 12 are fixed (integrated) via the power housing 15.

Gears 22 and 23 fixedly provided on the propulsion shaft 7 mesh with gears 16 and 17 on the transmission shaft 12, and in this example, the gear 16 and the gear 2
The gears 2 and 3 mesh with each other via an intermediate gear 24, and the gears 17 and 23 directly mesh with each other.

Therefore, in the illustrated example, the power shift transmission 10 is for forward and reverse rotation (shuttle).

However, the power shift transmission 10 may be for high and low (high, low).

A traveling system first gear transmission 25 includes a transmission shaft 27 having a transmission gear group 26 installed on an extension of the transmission shaft 12 and a transmission shaft.
It is composed of a transmission auxiliary shaft 29 and the like having a tubular structure having a transmission gear group 28 that is installed above 27 and on the axial center extension of the propulsion shaft 7, and is incorporated in the second mission case 5.

It should be noted that the first transmission 25 is illustrated in the drawings as a constant occlusal four-speed transmission.

Reference numeral 30 denotes a traveling system second transmission, which is driven by the first transmission 25 and is interlocked with the differential 31 and is incorporated in the third transmission case 6.

A PTO gear transmission 32 is provided at the rear of the tractor body 1.

The PTO system transmission 32 has a transmission shaft 35 having gears 33, 34 installed in a cassette case 36, and a PTO shaft 37 having gears 33, 34.
Gears 38 and 39 which are respectively interlocked with each other, and in the present embodiment, the gear 33 and the gear 38 are interlocked via an intermediate gear 40, and the gear 34
And the gear 39 are directly engaged.

The PTO shaft 37 is rotated in the direction of arrow A in FIG. 2, but when the forward and reverse rotation is used as the power shift transmission 10 as in this example, the PTO shaft 37 is rotated in the direction of arrow when the transmission 10 is reversed. Can't get

Therefore, a mounting ring body 41 for the gear 38 and a mounting ring body 42 for the gear 39 are provided on the PTO shaft 37 by coupling with a spline or the like, and the gears 38, 39 and the mounting ring bodies 41, 42 are In the mating part,
By providing the one-way clutches 43 and 44 which are in opposite directions to each other and the intermediate gear 40,
The shaft 37 is rotatable in the arrow A direction regardless of whether the transmission device 10 is forward or reverse.

Reference numeral 45 denotes a PTO propulsion shaft, which penetrates the speed change auxiliary shaft 29, has a gear transmission 46 at its front portion, and is joined to the PTO transmission shaft 35 at its rear portion via a coupling 47.

As shown in FIG. 1, the gear transmission 46 links the output side of the power shift transmission 10, the input side of the traveling system transmission 25, and the PTO propulsion shaft 45, and connects the transmission shaft 12 and the transmission shaft 27. A gear 49, which also serves as a coupled coupling, is engaged with a gear 49 which is freely rotatably fitted on the PTO propulsion shaft 45.

Reference numeral 50 denotes an on / off member, which is constructed by providing a shifter 52 on a coupling ring body 51 fitted and fixed to the front end portion of the PTO propulsion shaft 45, and allowing the shifter 52 to be freely engaged with and disengaged from an engaging portion 49A of a gear 49. Has been done.

Therefore, according to the above-described embodiment, when hydraulic pressure is applied to one of the pistons 13 and 14 of the power shift transmission 10 with the on / off member 50 turned off, one of the clutch plates 18 and 19 is engaged. Then, the transmission shaft 12 is rotated in the normal or reverse direction.
The transmission 30 will provide a two-speed shift.

Here, when shifting the first and second transmissions 25 and 30 of the traveling system, the power shift transmission 10 is set to the neutral position so that the transmission 10 also serves as the main clutch, and the shock absorber 8 absorbs the shock. To do.

With the power shift transmission 10 in the neutral position, the on / off member
When 50 is turned on and then the transmission 10 is turned in either forward or reverse direction, the PTO propulsion shaft 45 is driven via the gear transmission 46, which in turn drives the PTO shaft 37 via the PTO system transmission 32. It

The PTO system transmission 32 has a reverse rotation mechanism (intermediate gear 40, etc.), and has one-way clutches 43, 44 in opposite directions.
, The PTO shaft 37 is rotated in the direction of arrow A.

Incidentally, FIG. 4 shows a shaft coupling, in which a shaft c having a gear a is formed with a recess c from the shaft end face, and the shaft end of a second shaft d is inserted into the recess c and supported by a needle e. And
A gear f is supported on the second shaft d via a needle,
A support ring h of a shifter g integrated with the shaft d is formed, and the first shaft b and the second shaft d are joined by sliding of the shifter g.

At this time, the needle e is supported by the inner ring i to facilitate the inner surface processing of the recess c, and the support ring h is integrally formed so that the retaining ring and the like can be omitted.

(Effects of the Invention) The present invention is as described above, and since the propulsion shaft is directly connected to the engine, the main clutch for the engine can be omitted,
Here, the structure can be simplified and the cost can be reduced.

In addition, the power shift transmission also serves as the main clutch, and a half clutch can be obtained, so that traveling and PTO gear shifting can be performed, and the output side of the power shift transmission and the PT
Since the O-system propulsion shaft is interlocked with the gear transmission and the on / off member is provided, it is not necessary to provide a hydraulic clutch in the PTO system, and from this point the structure can be simplified and the cost can be reduced.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an elevation sectional view of a main part, FIG. 2 is an elevation sectional view of a PTO transmission, FIG. 3 is a configuration diagram of the entire mission, and FIG. It is sectional drawing of a shaft coupling. 2 ... Engine, 7 ... Propulsion shaft, 10 ... Power shift transmission, 25 ... Travel system transmission, 32 ... PTO system transmission, 45 ... PTO propulsion shaft, 46 ... Gear transmission, 50 ...... On / off member.

Claims (1)

[Claims] 1. The power of an engine (2) is transmitted to a power shift transmission (10) via a propulsion shaft (7), and
In a vehicle transmission that transmits to a traveling system gear transmission (25) and a PTO system gear transmission (32) via the power shift transmission (10), the propulsion shaft (7) is directly connected to the engine (2). Then, the propulsion shaft (7) is used as an input shaft of the power shift transmission (10), and a transmission shaft (12) installed in parallel with the input shaft (7) is output from the power shift transmission (10). A power shift transmission unit is provided on the output shaft (12) as a shaft, the traveling system gear transmission (25) is arranged on the output side of the power shift transmission (10), and the gear transmission (25)
Are coaxial with a transmission shaft (27) provided coaxially with the output shaft (12) of the power shift transmission (10) and a propulsion shaft (7) which is an input shaft of the power shift transmission (10). A transmission gearbox (26) (2
8), the speed change auxiliary shaft (29) has a hollow shaft structure, and the propulsion shaft (45) of the PTO gear transmission (32) is inserted into the speed change auxiliary shaft (29). A gear transmission (46) is provided between the shaft (45) and the transmission shaft (27), and the propulsion shaft (45) of the PTO gear transmission (32) is provided via the gear transmission (46). A transmission for a vehicle, comprising: an on / off member (50) for turning power on and off.