JPH0311058Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transmission used for running agricultural or civil engineering work equipment.

[Conventional technology]

The transmission of the work machine to be improved by the present invention has an input shaft and a speed change shaft mounted parallel to each other in a transmission case, and a plurality of hydraulically operated speed change clutches are built in on the speed change shaft. A clutch unit configured to change the speed of the power from the input shaft and transmit it to the transmission shaft, and a clutch housing is provided in close contact with the outer periphery of the clutch drum of the clutch unit so as to be relatively rotatable, and the clutch An oil passage for the transmission clutch is formed between the drum and the clutch housing.

[Problem that the invention attempts to solve]

The transmission of a working machine with the basic configuration described above can change speed by hydraulic operation, and has an extremely simple structure. However, as a working machine,
There is a desire to have a multi-speed shifting function that can be adapted to various working conditions, and in that case, it is necessary to create a system that does not simply increase the number of expensive hydraulically operated transmission clutches, or without complicating the structure. I want to make it multi-stage.

In addition, as a work machine, it is necessary to extract not only the output for traveling but also the so-called PTO output for speed sprayers, mania spreaders, or rotary tillers with reduction gears, so Improvements were awaited.

[Means for solving problems]

The transmission of the work machine according to the present invention is a clutch unit in which an input shaft and a speed change shaft are mounted parallel to each other in a transmission case, and a plurality of hydraulically operated speed change clutches are built in on the speed change shaft. A clutch housing is provided in close contact with the outer periphery of the clutch drum of the clutch unit so as to be relatively rotatable, and the clutch drum and the In the transmission of a working machine, in which an oil passage for the speed change clutch is formed across the clutch housing, a double auxiliary speed change gear is slidably provided on the speed change shaft, and the input shaft is extended to form a PTO shaft. an output shaft configured to have a structure in which a double auxiliary transmission gear that selectively engages with the two auxiliary transmission gears is loosely fitted to the PTO shaft, and an output gear that is always engaged with the two auxiliary transmission gears is provided. was mounted on a shaft.

[Effect]

The speeds obtained by each hydraulically operated speed change clutch are further changed into multiple speeds by selective engagement of the auxiliary speed change gear. In this case, the originally provided input shaft is extended and used as a PTO shaft, and at the same time, this shaft is used to loosely fit one of the sub-transmission gears.

[Effect of idea]

Therefore, in addition to the number of gears that can be changed by hydraulic operation, the speed can be doubled by using an inexpensive gear-locking auxiliary gear, and the input shaft can be extended as is.
In a configuration in which the shaft is used as a PTO shaft, one of the auxiliary transmission gears is loosely fitted onto this shaft to serve as a dual-purpose member, thereby simplifying the structure.

〔Example〕

As shown in the figure, M indicates a transmission case of a transport vehicle as an example of a working machine, and this case has open ends at the front and back, and has a front wall.
_M1 and a rear wall _M2 are detachably attached to the main body _M3 . Reference numeral 1 denotes an input shaft, the front end of which is interlocked with an engine (not shown), and the rear end used as a PTO shaft for driving a speed sprayer, manual sprayer, etc. The input shaft 1 is supported on the _front wall M ₁ and the rear wall M ₂ via bearings B ₁ and B ₂ , and a low speed (high torque )
A small-diameter gear G ₁ that transmits the transmission is attached with a spline so that it can rotate integrally, and as you move toward the back of the transmission case M, a medium-diameter gear G ₂ for medium speeds and a large-diameter gear G 2 for high speeds are installed. Gear G ₃ , reverse gear G ₄
are provided in the same way. _G5 is an auxiliary transmission gear, which is freely rotatable on a shaft extending from the input shaft 1 to form a PTO shaft 1', and is connected to the rear wall.
Located closest to _M2 . This auxiliary transmission gear
G ₅ is composed of a double gear consisting of large and small gears G ₅ ′ and G ₅ ″, and the small gear G ₅ ″ is connected to an output gear provided on an output shaft 2 mounted separately, as shown in Fig. 2. Occlusal with G ₆ . This output shaft 2 drives running wheels (not shown). Reference numeral 3 denotes a transmission shaft, which is connected parallel to the input shaft 1 to the front and rear walls M ₁ , M ₂ and the intermediate wall M ₄ of the transmission case M via bearings B ₃ , B ₄ , B _{5 ,} respectively. It is pivoted. This speed change shaft 3 is provided with a large diameter gear g 1 that is closest to the front wall M ₁ and meshes with the small diameter gear G ₁ , and the driving force of this large diameter gear _{g 1 is} applied to the speed change shaft 3. A hydraulically operated low speed clutch C ₁ for switching on and off is provided adjacently. This low-speed clutch _C1 is the largest and therefore has the largest diameter compared to the other clutches described below for high torque transmission. In pair with this low speed clutch _C1 , a medium speed clutch _C2 is configured on the back side of this low speed clutch _C1 , and is similarly provided on the speed change shaft 3 that meshes with the medium speed gear _G2 . The medium-diameter gear _g2 is switched to a driving state and a driving release state with respect to the speed change shaft 3. These low and medium speed clutches
C ₁ and C ₂ are configured into one clutch unit CP ₁ , and a clutch drum D ₁ is provided on the outside.
Reference numeral 4 denotes a clutch housing, which is disposed in close contact with the outer periphery of the clutch drum D ₁ so as to be relatively rotatable, and in which the low- and medium-speed clutches C ₁ ,
Oil passages 5, 5 for the _C2 piston are formed. 6, 6 are oil seals, and a clutch drum formed corresponding to the oil passages 5, 5;
It is provided along the circumferential groove on _D1 , and as a whole constitutes a so-called rotary joint. C ₃ is a high-speed clutch, and is provided on the shift shaft 3 and further back than the medium-speed clutch C ₂ , and is located closer to the front wall M ₁ than the middle speed clutch C 2 .
a large diameter gear provided on the side and on the input shaft 1;
The small diameter gear g ₃ that engages with gear G ₃ is configured to be switched between a driving state and a driving release state with respect to the speed change shaft 3. A reverse clutch C ₄ , which is composed of the high speed clutch C ₃ and one clutch unit CP ₂ , is provided further back than the high speed clutch C ₃ . It is configured such that the reverse gear _g4 on the rear side of _C4 can be driven and released from the speed change shaft 3. The gear g ₄ is connected to the gear via the reverse gear g ₄ ′.
Occlusal to G ₄ . These high speed and reverse clutches C ₃ and C ₄ have one clutch drum D ₂ . Reference numeral 7 denotes a clutch housing, which is disposed in close contact with the outer periphery of the clutch drum D ₂ so as to be able to rotate relative to the clutch drum D ₂ .
Oil passages 8, 8 facing the circumferential groove formed on the outer peripheral surface of
A rotary joint similar to that described above is constituted by oil seals 9, 9 provided along the circumferential groove. g ₅ is a double auxiliary transmission output gear, which is composed of large and small gears g ₅ ′ and g ₅ ″, and is rotatable and sliding integrally on the transmission shaft 3 between the intermediate wall M ₄ and the rear wall M ₂ . an auxiliary transmission gear that is freely spline-fitted and loosely fitted onto the PTO shaft 1';
The large and small gears G _{5 ′} and G ₅ ″ of G 5 are selectively engaged with each other, including the neutral position, so that each of the above-mentioned clutches
The shift driving force alternatively outputted by C ₁ , C ₂ , C ₃ , and C ₄ is transmitted to the output shaft 2 through sub-shift.
The medium speed gear g ₂ on the transmission shaft 3 mentioned above has a substantially smaller diameter than its clutch drum D 1 , and the high speed gear g ₃ has a smaller diameter than its clutch drum D ₁ .
It has a larger diameter than the clutch drum _D2 , but a smaller diameter than the clutch drum _D1 , and the reverse gear _g4 has a substantially smaller diameter than the clutch drum _D2 . That is, each of these members g ₁ , D ₁ , g ₂ ,
The diameters of g ₃ , D ₂ , and g ₄ gradually become smaller as they go further back from the front wall M ₁ , thereby making it easier to assemble these members on the transmission shaft 3 . The transmission case M can then be inserted and installed from the front end opening of the transmission case M at once. 10 is the hydraulically operated transmission clutch C ₁ ~
This is a control valve that selectively operates _C4 .

[Brief explanation of the drawing]

The drawings show an embodiment of the transmission of the working machine according to the present invention, and FIG. 1 is an overall longitudinal sectional side view;
FIG. 2 is a view taken along the - line in FIG. 1. 1...Input shaft, 1'...PTO shaft, 2...Output shaft, 3...Shift shaft, 4, 7...Clutch housing, 5, 8...Oil passage, _C1 to _C4 ...Shift clutch ,
CP ₁ , CP ₂ ... Clutch pack, D ₁ , D ₂ ... Clutch drum, M ... Transmission case,
_G5 , _g5 ...Double sub-transmission gear, _G6 ...Output gear.

Claims (1)

[Claims for Utility Model Registration] An input shaft 1 and a speed change shaft 3 are mounted parallel to each other in a transmission case M, and the speed change shaft 3 is
Above, multiple hydraulically operated transmission clutches C ₁ ,
Clutch unit CP ₁ with built-in C ₂ , C ₃ , C ₄ ,
CP ₂ is provided to change the speed of the power from the input shaft 1 and transmit it to the transmission shaft 3, and a clutch drum of the clutch units CP ₁ and CP ₂ is provided.
Clutch housings 4 and 7 are provided in close contact with the outer peripheries of D ₁ and D ₂ so as to be relatively rotatable, and the clutch drums D ₁ and D ₂ and the clutch housings 4 and 7
and the transmission clutches C ₁ , C ₂ , C ₃ , C ₄
In the transmission of a working machine in which oil passages 5 and 8 are formed for the transmission shaft 3, two
A sub-transmission gear _g5 is slidably provided, and the input shaft 1 is extended to form a PTO shaft 1'.
A dual auxiliary transmission gear _G5 that selectively engages with the dual auxiliary transmission gear _G5 is loosely fitted onto the shaft 1', and an output gear _G6 that is always engaged with the dual auxiliary transmission gear _G5.
A transmission for a working machine with an output shaft 2 mounted on a shaft. The transmission for a working machine according to claim 1, wherein the auxiliary transmission gear _G5 is arranged behind the hydraulically operated transmission clutch units _{CP1 and CP2} .