JPH0518520Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a transmission for agricultural machinery, and more specifically, a transmission system in which a plurality of hydraulically operated transmission clutch units are arranged on a transmission shaft. The present invention relates to a transmission in which a housing is provided in a transmission case and slidably contacts the outer peripheral surface of a drum of the clutch unit in a relatively rotatable manner, and an oil passage is provided from the housing to the drum.

[Conventional technology]

The above-mentioned hydraulically operated transmission clutch unit is naturally large for low-speed applications that transmit high torque, and its gears are also large in diameter, whereas for high-speed applications, it is small because it transmits low torque, and its gears gradually become smaller in diameter. It is becoming. Conventionally, the method of sequentially assembling clutch units and gears of different diameters into a transmission case was to cut the transmission case in half in a direction perpendicular to the gear shift shaft to facilitate assembly. .

[Problem that the invention attempts to solve]

The conventional method of splitting the transmission case in half and installing a hydraulically operated transmission clutch unit and gears in each half is expensive because the transmission case has to be split in half, and the transmission case is split in half. The high and low speed clutch units and gears had to be individually assembled into the case, which was extremely time-consuming.

Therefore, a configuration was considered in which the transmission case could be inserted from the side by configuring its ends to be openable and closable, but in this case, a large-diameter low-speed clutch unit could be inserted into the transmission case. It was difficult to properly insert and assemble the gears to the back of the transmission case.

[Means for solving problems]

In order to solve the above problems, the transmission of the agricultural machine according to the present invention is configured such that the end of the transmission case can be opened and closed, and the input shaft and the speed change shaft are attached to the transmission case. a plurality of hydraulically operated transmission clutches are provided on the transmission shaft, a housing is integrally provided with the transmission case and slides in relative rotationally relative to the outer peripheral surface of a clutch drum of the hydraulically operated transmission clutch; In a transmission for an agricultural machine in which an oil passage is formed between a clutch drum and the housing, the hydraulically operated transmission clutch and the transmission gear corresponding thereto are inserted from an open end of the transmission case. The diameter becomes substantially smaller toward the rear, and in each transmission clutch, the gear on the rear side with respect to the clutch drum is configured to have a smaller diameter than the clutch drum.

[Effect]

When assembling, assemble the high/low speed clutch unit and each transmission gear on the transmission shaft so that the smaller diameter one is located at the back of the transmission case, and then assemble the transmission as a whole. Insert it from the open end of the case.

[Effect of idea]

Therefore, it has become extremely easy to assemble the high/low speed clutch unit and the transmission gear.

In particular, in a configuration in which the housing slides into contact with the outer peripheral surface of the clutch unit, the insertion clearance is small, and if a gear with a different diameter is inserted separately at an angle, there is a risk of damaging the inner surface of the housing. As mentioned above, since each component can be assembled onto the speed change shaft in descending order of diameter to form a unit and then inserted as a whole, there is an advantage that damage to the inner surface of the housing and the outer circumferential surface of the clutch unit can be avoided.

〔Example〕

As shown in _the figure, M indicates a transmission case of a transport vehicle as an example of an agricultural machine _. It is detachably assembled to ₃ . 1 is an input shaft, the front end of which is interlocked and connected to the engine (not shown), and the rear end used as a PTO shaft. This input shaft 1
is the bearing B ₁ at the front wall M ₁ and the rear wall M ₂ ,
A small-diameter gear _G1 , which is closest to the front wall _M1 and transmits low speed (high torque), is mounted on the shaft with a spline so that it can rotate integrally with the transmission. Case M
As you go towards the back, you will see medium diameter gear G2 for medium speed, large diameter gear G3 for high speed, and reverse gear G4.
are provided in the same way. G5 is a sub-transmission gear, which is freely rotatably provided on the input shaft 1, and is disposed closest to the rear wall _M2 .
This sub-transmission gear G5 includes large and small gears G5' and G
As shown in FIG. 2, the small gear G5'' meshes with an output gear G6 provided on an output shaft 2 mounted separately. This output shaft 2 drives running wheels (not shown). Reference numeral 3 denotes a transmission shaft, which extends parallel to the input shaft 1 to the front and rear walls M ₁ , M ₂ and the intermediate wall of the transmission case M.
They are supported on _M4 via bearings _B3 , _B4 , and _B5, respectively. This transmission shaft 3 includes a large diameter gear g 1 which is closest to the front wall M ₁ and meshes with the small diameter gear G _{1 .}
is provided, and a hydraulically operated low-speed clutch _C1 for switching the driving force of the large-diameter gear _g1 on and off with respect to the transmission shaft 3 is provided adjacent thereto. 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 where it 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 constructed into one clutch unit, 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 _D1 so as to be relatively rotatable, and includes the lower,
Oil passage 5 for the pistons of medium speed clutches C ₁ and C ₂ ,
5 is formed. Reference numerals 6 and 6 denote oil seals, which are provided along a circumferential groove on the clutch drum _D1 formed corresponding to the oil passages 5, 5, and collectively constitute a so-called rotary joint.

_C3 is a clutch for high speeds, and is provided on the shift shaft 3, further back than the clutch _C2 for medium speeds, and is located closer to the front wall _M1 than the clutch C2 for medium speeds. and the input shaft 1
The small diameter gear g3 that meshes with the upper large diameter gear _G3 is configured to be switched between a driving state and a driving release state with respect to the speed change shaft 3. This high speed clutch
A reverse clutch C ₄ is located further back than C ₃ and is configured as a single unit with this high _- speed clutch C ₃ . gear g ₄ , said gear shift shaft 3
It is configured so that it can be driven and released from the drive. The gear _g4 meshes with the gear _G4 via a reverse gear g4'. 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 _D2 so as to be able to rotate relative to the clutch drum.
Oil passage 8 corresponding to the circumferential groove formed on the outer peripheral surface of _D2 ,
8 is provided, and oil seals 9, 9 provided along the circumferential groove constitute a rotary joint similar to that described above. _g5 is a sub-transmission output gear, which is integrally rotatably and slidably spline-fitted onto the transmission shaft 3 between the intermediate wall _M4 and the rear wall _M2 ; are selectively engaged with the large and small gears G5' and G5'', including the neutral position, so that each of the 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 _g2 on the transmission shaft 3 mentioned above is configured to have a substantially smaller diameter than the clutch drum _D1 ,
The high-speed gear _g3 has a larger diameter than the clutch drum _D2 , but has a smaller diameter than the clutch drum _D1 , and the reverse gear _g4 has a substantially larger diameter than the clutch drum _D2 . It is constructed with a small diameter. That is, each of these members g ₁ , D ₁ , g ₂ , g ₃ ,
The diameters of D ₂ and g ₄ gradually become smaller as they go further back from the front wall M ₁ , which makes it easier to assemble these members on the transmission shaft 3. Later, the transmission case M can be inserted and installed at once through the front end opening. 1
Reference numeral 0 designates a control valve for selectively operating the hydraulically operated transmission clutches C ₁ to _{C 4} .

Although the above embodiment shows an example of three forward speeds and one reverse speed, even if the number of gears is further increased, the clutches and gears may be arranged in the same order.

[Brief explanation of the drawing]

The drawings show an embodiment of a transmission for an agricultural machine according to the present invention, and FIG. 1 is a longitudinal sectional side view of the whole, and FIG. 2 is a view taken along the - line in FIG. 1. 1...Input shaft, 3...Transmission shaft, 4, 7...Housing, _C1 to _C4 ...Hydraulic operated clutch, _D1 ,
_D2 ...Clutch drum, M...Transmission case, _g1 to _g4 ...Gear.

Claims (1)

[Scope of utility model registration request] The end of a transmission case M is configured to be openable and closable, an input shaft 1 and a speed change shaft 3 are mounted on the transmission case M, and a plurality of hydraulically operated speed change clutches _C1 are mounted on the speed change shaft 3. ~ C ₄ is provided,
Housings 4 and ₇ are provided integrally with the transmission case _M , and are integrally provided with the transmission case M, and are in sliding contact with the outer peripheral surfaces of the clutch drums D ₁ and D ₂ of the hydraulically operated transmission clutches C 1 to C ₄ in a relatively rotatable manner. ，
D ₂ and the housings 4 and 7, an oil passage 5,
8, in which the hydraulically operated transmission clutch C ₁ -
C ₄ and the corresponding transmission gears g ₁ to _{g 4} are sequentially made substantially smaller in diameter from the open end of the transmission case M toward the back, and
In each of the transmission clutches C ₁ to C ₄ , the gears g ₂ and g ₄ on the far side relative to the clutch drums D ₁ and D ₂ are connected to each other.
A transmission for agricultural machinery that has a smaller diameter than the clutch drums _D1 and _D2 .