JPS62210132A - Transmission gear for self-propelled farm working vehicle - Google Patents

Abstract

PURPOSE:To reduce an interval between front and rear wheels and improve the extent of turnability in a vehicle, by forming a transmission gear into such a construction that transmits engine power to the hydrostatic power transmission installed in the endmost part of a machine body, from which transmits it to driving wheels via a transmission to be situated at the inside in the longitudinal direction of the machine body. CONSTITUTION:Power of an engine 11 being mounted on a car machine frame 10 is inputted into the hydrostatic power transmission 22 set up in the rearmost part of a machine body in the front of the machine body via a main clutch 19 and a power transmission shaft 23. The hydrostatic power transmission 22 sets up a variable displacement hydraulic pump and a fixed displacement hydraulic pump up and down, and it is constituted of connecting these pumps with a pair of hydraulic feed and discharge passages. A transmission case 15 installing a mechanical transmission inside is set up in the front of this hydrostatic power transmission 22 in a way of superposing the upper half part on a lower half part of the hydrostatic power transmission 22. Then, both symmetric rear wheels 16 are supported on the transmission case 15. In addition, a differential gear is installed in this transmission case 15 and power is transmitted to the side of front wheels 2 via a power transmission shaft 21.

Description

[Detailed Description of the Invention] This @ Ming is concerned with the transmission device that controls the transmission of running power in a self-propelled working vehicle of the tractor type, which has an engine mounted on one end of the machine in the longitudinal direction. The present invention provides a complete transmission device that secures a large space for a mid-mount type working machine installed on the upper surface of the machine at an intermediate position in the longitudinal direction of the machine.

Conventional technologyIn self-propelled working vehicles such as mowers and tractors, which are equipped with all mid-mounted work equipment, the front and rear wheels are placed between the front and rear wheels to ensure space for the work equipment between the front and rear wheels. It is required that the ground clearance of the fuselage part to be used is large and that the distance between the front wheels and the rear wheels is large.

This transmission for driving is made compact by connecting a comparatively compact hydraulic transmission device and a small mechanical transmission in series, and such a transmission is used for the front wheels. In order to avoid reducing the ground clearance of the aircraft between the rear wheels and the rear wheels, vehicles with the engine mounted on the front of the aircraft should place the engine on the rear side of the aircraft. In vehicles with engines mounted on the rear of the fuselage, the engines are placed as far as possible toward the front of the fuselage.

Such a typical prior art example is, for example, US Pat. No. 1, 3,528
, 311 and Na 4, 304, 141, efforts are made to position the transmission device only between the left and right rear wheels as much as possible. In these conventional examples, a mission case housing a mechanical transmission is installed at the rear end of the aircraft, and the left and right rear wheels are all supported by the mission case, and the rear wheels are rotationally driven by the mechanical transmission. .

According to the above-mentioned conventional technology, although the necessary ground clearance of the body part between the front and rear wheels is secured, there is still a problem in securing a large longitudinal distance between the front and rear wheels.

In other words, if the above-mentioned longitudinal spacing is increased, the entire transmission mechanism consisting of the overlapping hydraulic transmission device and transmission case will be shifted rearward, but when sledding, the front wheels This is because the distance between the rear wheels becomes too large, making it impossible for the vehicle to make a small 3+1-degree turn. It is important to make small turns for work such as mowers and tractors that are used in relatively narrow spaces.
It's no good.

In addition, in conventional mechanical transmissions, as disclosed in the above-mentioned U.S. Pat. Since the rear wheel differential is located at the rear of the transmission mechanism, the IJ rear length is thick, and the support device Jiii G is mounted on the transmission case at the front and rear positions corresponding to the differential. The rear wheels were placed in a position corresponding to the rearmost part of the mechanical transmission, which by itself already had a negative effect on the car's sharp turning performance.

The main purpose of this invention is to simultaneously satisfy two mutually contradictory requirements, such as securing space for a mind-mounted work machine and the ability to run and turn the vehicle. There is a Vc that provides a new transmission device for self-propelled work vehicles, which is a transmission device and a mechanical transmission or its transmission case.

In order to solve the problem, this invention is based on a self-propelled working vehicle that has an engine mounted on one end of the machine body in the longitudinal direction.
11, l 11) 2) - A hydraulic transmission device (22, 122) to which the power is inputted is installed at the extreme end of the aircraft on the other end side in the iJ rear direction of the aircraft, and this hydraulic transmission device (22,
Mission case (15, 115) that houses the mechanical transmission that receives power from the hydraulic motor (34, 134) of 122). , the left and right drive wheels (16, 116) fj are installed so that the upper half completely overlaps the lower half of the hydraulic transmission device (22, 122), and are rotationally driven by receiving power from the mechanical transmission.
! :, We took technical measures such as installing it in a way that was difficult to support in the mission case (15, 115).

Therefore, according to this invention, the engine (11°111)
The power is first transferred to the hydraulic power transmission system (22
, 122) is inputted to C1. From there, it is input to the mission case (15, 115) through the mechanical transmission 2 of the mission case (15, 115) gate located inside the aircraft in the longitudinal direction.
115) It will be transmitted to the K-supported drive wheels (16, 116). The longitudinal position of the drive wheels (16, 116) based on the longitudinal length of the aircraft body is the hydraulic transmission device I! 1'i In contrast to the conventional structure where M-tatami mats were installed in the transmission case on the opposite side from the engine, the front and rear width occupied by the hydraulic transmission device will be moved to the engine side.

Therefore, in order to obtain a space for the work equipment with the same front and rear width between the front and rear wheels, the drive wheel position is moved to the other wheel side compared to the conventional structure, and the gap between the niJ rear wheels is reduced. The small turning performance of the vehicle is improved. Conversely, if the spacing between the cast wheels is set to be the same as that of a vehicle equipped with a conventionally structured transmission device, the transmission case (15
, 115) As a whole standard, hydraulic power transmission equipment (22, 12
2) has been moved to the side opposite the engine, which opens up the inside of the mission case when viewed in the longitudinal direction of the aircraft, expanding the longitudinal width of the space for the c1 mid-mount type work equipment.

In other words, if this invention is applied, the two requirements of securing space for the mid-mounted working machine and maneuverability of the vehicle will be satisfied without contradiction.

Hydraulic transmission system f on the side far from the engine when viewed in the longitudinal direction of the aircraft
! (22, 122) and the mission case (15, 115) on the side closer to the engine (1) overlap with the lower and upper halves, so that the hydraulic transmission device on the side far from the engine Even if the transmission shaft passes through the upper side of the transmission case, there will be no problem in power input to the hydraulic transmission device.

In one embodiment of the present invention, the mechanical transmission receives an input transmission from the hydraulic motor (34) and a mechanical transmission (4υ) that receives an input transmission from the hydraulic motor (34) and transmits an output in the left-right direction of the aircraft. Differential device (4
6), with the mechanical transmission (4υ) located in the transmission case (I) on the side closer to the hydraulic transmission gear, and the differential gear (4υ) located on the opposite side, respectively. According to this structure, the hydraulic transmission device or its hydraulic motor (to) is connected to the mechanical transmission (
The transmission path leading to the differential gear (46) through the transmission case transmits power from the side close to the hydraulic transmission device (b) to the side far from the transmission case (II19FF3 mechanical transmission). At the same time, #Aa!Nara, which corresponds to the difference in the front and back direction of the aircraft and is placed at the foot position, is relatively close to the front and rear of the aircraft within the rear width of the mission case (15). As a result, the turning performance of the vehicle is further improved.

In another embodiment of the present invention, in addition to the above-mentioned structure, the mechanical transmission (dog) is connected to the hydraulic motor (3. Several interlocking units are installed overflowing from left to right! 1
IIIl (47) and this drive shaft (4 shafts) and the transmission shaft (corresponding to the 4 barrels). In contrast to the structure in which two !IQins are installed side by side in the front and rear directions of the aircraft, the rear width of the mechanical transmission (nIJ occupied by the state) is much smaller, and the front and rear width of this friend's mission case is also made smaller. Contributes to expanding the front and rear width of the rocky shore installation space.

According to another embodiment of the present invention, the @rear width of the transmission case is further larger than the drive shaft 7).
By placing the barrel on the F level, it can be further reduced. According to this structure, the distance 1lII11 necessary to obtain the desired speed change can be adjusted to the above two shafts (47, 48
), the n between the two axes is
This is because the interval after tl can be made smaller.

If the self-propelled work 4 is a four-wheel drive type, the driving force of the car located on the engine side (fcK) which is driven at full rotation will be extracted from the transmission case θ, but the above-mentioned In another embodiment of the present invention, in a structure in which a mechanical transmission (45) and a differential device are provided,
Left and right wheels (1) located in the engine (11) fRO
Full power output for rotationally driving 4 Single wheel drive power output 1
M (37) in the solution case (upper part in 151)
45) to the engine (11) 04+1, and this wheel drive force output shaft (37)
The bevel gear transmission mechanism (64, 65) is interlocked and connected to the differential case diagram of the J device (46) by the transmission wJ device, which includes all of the bevel gear transmission mechanisms (64 and 65).

The wheel driving force extraction shaft 67) is connected to the extraction shaft and transmits power to a single wheel located on the engine side.
# is provided in such a way that it can be placed at a high level where it does not interfere with mid-mount type work equipment, but the above structure allows such a power take-off@0η to be placed at a distance of the differential device t461. The problem is how to connect it to the mechanical transmission (4 (to)) located on the opposite side of the differential gear. By paying attention to a certain point, we solved the problem with a structure with a +1 rate.

According to another embodiment of the present invention, the transmission device described above is provided with a rock pressure overflowing to the right between the differential sea bream device frame and the wheel drive force output 4i111 in the upper part of the mission case (101). intermediate shaft (64) and this intermediate shaft 14
A gear (64) that is fixedly installed on the top and meshes with the human gear width η of the difference wJgc setting, a bevel tooth jLI54) that is loosely fitted on the intermediate shaft 1, and the intermediate 11
a clutch sleeve (66) which is slidably provided on the f11I wheel and which enables the bevel gear to be selectively coupled to the intermediate shaft; and a clutch sleeve (66) which is fixedly installed on the wheel drive force extraction shaft η. (r) A bevel gear meshed with the bevel gear HK. Clutch sleeve tI3q mentioned above
serves as a clutch means for taking out the wheel drive blades if necessary, and the intermediate shaft 1'4 provided with this clutch means is configured to rotate slowly with respect to the differential case diagram using the input gear η of the differential gear. This reduces the number of transmission gears.

Embodiment A first embodiment illustrated in FIGS. 1-6 illustrates the present invention.
As shown in FIG. 2, an example of implementation is performed in a mower tractor equipped with a mower Mt on the lower surface of the fuselage at an intermediate position in the longitudinal direction of the fuselage.

As shown in FIG. 1.2, the vehicle frame 10 is provided as a long rectangular frame in the front and rear, and the engine 11 is supported by the vehicle frame 10 and mounted on the front part of the vehicle body. On the front lower surface side of the vehicle frame 10, a front axle/1 hinge 13t- for supporting the left and right front wheels 12 is supported so as to be swingable left and right around the center bin 14. A transmission case 15 is supported on the rear lower surface side of the vehicle frame 10 as will be described later, and the left and right rear wheels 16 are connected to the transmission case 15 &? : Supported.

The passenger seat 17 is installed on the upper rear side of the aircraft. The vehicle is steered by turning the front wheels 12, and a steering wheel 18 for turning the front wheel 12 is disposed in front of the passenger seat 17.

Arrangement of Transmission Mechanism The illustrated trough j1 drives the rear wheels 16 and 7 times, and also rotates the front wheels 12 as necessary to drive the vehicle. The rear wheels 16 are driven by mission case 1 as described below.
The IKM of the front wheels 12 transmits the transmission N21 for transmitting power from the mission case 15 to the front axle housing 13 in the rear direction of the aircraft body EaJ. It is said that the story will be performed throughout the entirety of the story.

As shown in Figure 'fjl-3, a hydraulic transmission device 22 is installed at the rear end of the fuselage, and the power of the engine 11 is first input to this hydraulic transmission device 22. This is defined as a transmission 1 [11123] (provided all along the front and rear directions of the aircraft) that transmits power from the engine 11 to the main clutch and 19 to the hydraulic transmission device 22. The hydraulic pump 24 of the device 22 is connected to the pump 25 by a universal joint 26 .

Inside the mission case 15 is a mechanical transmission as shown in Fig. 3.4, but the upper half of the back of the mission case 15 has a flat mounting hole with screw holes 27 as shown in Fig. 5. It is formed on the surface 28.

As clearly shown in FIG. 3, seven flange 29 is provided on the front surface of the lower half of the hydraulic transmission device 22, and the seven flange 29t is attached to the mounting surface 28, and the fixing screw is screwed into the tapped hole 27. The hydraulic transmission device 22 is fixedly attached to the transmission case 15 by a tool 30. The transmission case 15 is disposed so as to overlap the front side of the lower half of the hydraulic transmission device 22 and the rear side of the upper half thereof. It is supported by the machine frame 10 on the 15 side.

That is, as shown in FIG. 5, axle cases 31 that cover the rear wheel axle 20 are fixedly mounted on both the left and right sides of the transmission case 15, and each of the left and right axle cases 31 has a pair of axle cases 31 on its upper surface. A seat portion 32 for the purpose is integrally formed. As clearly shown in Fig. 2.5 and 90° out of phase in Fig. 4, there is a pair of fixing devices that pass through the top and bottom of the machine frame 10i and are screwed into screw holes in the valley seat 32. Each axle case 31 is fixed to the machine frame 10 using a tool 33.

Power is input to the mechanical transmission in the mission case 15 from the hydraulic motor 34 of the hydraulic transmission device 22. That is, as shown in FIGS. 3 and 4, the motor shaft 35 of the hydraulic motor 34 is extended to the transmission gear 215 located in front, and the bevel gear 36, which is a manually rotated body, is fixedly installed on the extended end. are doing.

The mechanical transmission inside the mission case 15 has, as its output shaft, a front wheel drive force output @37 that extends forward, in addition to the rear wheel axle 20 that extends left and right. Each vehicle FD120 has seven flange 20ak for wheel attachment at its outer end as shown in Fig. 2.5, and the front wheel drive force output shaft 37 has a universal joint 38 with mJ notation as shown in Fig. 1.2. It is connected to the moving shaft 21.

Hydraulic Transmission Device The hydraulic transmission device 22 has a conventional structure in which it is connected to the hydraulic motor 34, which is of a variable displacement type, through a pair of hydraulic supply/discharge passages (not shown). Only the external appearance is shown in FIG.

The hydraulic pump 24 and the hydraulic motor 34 are arranged vertically along the front-rear direction, and the pump shaft 25 is connected to the engine 1.
The transmission case 15 is connected to the transmission wJ shaft 23 (FIGS. 1 and 2), which transmits power from the transmission case 15. The pump shaft 25 extends rearward from the hydraulic transmission device 22 and is configured as a tth PTO@40 that transmits power to another working machine through its extension. The oil passage connecting the hydraulic pump 24 and the hydraulic motor 34 is formed in a thick plate 41 installed on the back of the hydraulic transmission device 22, and a thick plate 41 is installed on the back of the plate 41 to be inserted into the oil passage. A line filter 42 is installed.

The volume of the hydraulic pump 24 is controlled by changing the swash plate 3, as shown in the shut-off example, and in FIG. It is the axis.

Mechanical Transmission The structure of the mechanical transmission provided within the mission case 15 will be described with reference to all of FIGS. 3 and 4.

This mechanical transmission includes a mechanical transmission 45 and a differential gear @46, and the differential gear 46 is arranged on the front side of the transmission gear 45 as well.

The mechanical transmission 45 is disposed between a drive shaft 11147 and a transmission shaft 48, which are provided in the left and right directions of the aircraft body. The drive wJ@47 has a bevel gear 49 meshed with the bevel gear 36 on the motor shaft 35 fixed thereon, and is rotationally driven by the motor shaft 35. As shown in FIG. 3, the speed change shaft 48 is arranged at a lower level than the drive shaft 47. As shown in FIG. 4, it is fixedly installed on the drive shaft 47. 'c2 teeth 4
A two-row transmission gear train is constructed by loosely fitting the gears 50 and 51 onto the transmission shaft 48 and meshing the corresponding gears 52 and 53 of the two fc gears. A spline collar 54 is fixedly installed on the speed change shaft 48 between both #I forces 52 and 53, and a shifter sleeve 55 is slidably placed on the spline collar 54. The shifter sleeve 55 is operated seven feet along the @ll line direction of the speed change shaft 48, and the pawls on the circumferential surface are moved between the gears 52, 53.
Each gear 5 is engaged with the upper pawl of the boss portion of
2.53 and is selectively coupled to the transmission 4II1148.

The differential device 46 receives an input transmission from the transmission device 45;
Said extending in the left and right direction! It is supposed to be output to @20. The entire large-diameter input gear 57 is fixed to the differential case 56 of the differential 'wJ device 46, which is rotatably supported by the transmission case 15, with a fixture 58, and the input gear 57 is used to change gears. Gear 5 integrally formed on shaft 48
It meshes with 9-. The left and right axles 20 are differential cases 56
After entering FE3, the differential gear 46 is supported by the differential case 56 via the pin 60 at 7'C1 as usual.
Fits into the pair of drive binions and the left and right axles 20, fc
It is formed by meshing a pair of driven pinions as shown in FIG. Note that the differential device 46 does not directly transmit output to the left and right axles 20 as shown in the figure, but is connected to the left and right axles via the left and right final reduction gear mechanisms (fc to the left and right output shafts). It can also be configured to perform all output.

The differential gear 46 is equipped with a friction multi-disc differential lock clutch 61 which is supported by a boss part totef case 56 of the minus side dorigun binion and a friction clutch 61 for a plurality of friction plates, each of which is slidably supported. There is.

The front wheel drive force extraction shaft 37 is mounted above the transmission case 15 (as shown in FIG. 1.3) so that the transmission shaft 21 (FIG. 1.2) connected thereto does not interfere with the mower M. 45), and is arranged to transmit power to the front wheel drive force output shaft 37, and is provided with the following transmission device. That is, the third
．． As shown in Fig. 4, an intermediate shaft 62 is provided in the upper and front part of the mission case 15, and the intermediate shaft 62 moves in the left-right direction of the aircraft.
This intermediate shaft 62 has a gear 63 integrally formed thereon and meshes with the input gear 57 of the differential gear 46, so that
Same rotation with the differential case 56 -+! :It is considered to be despised. A bevel gear 64 is loosely fitted onto the intermediate shaft 62, and this bevel gear 64 is used for front wheel drive force extraction @37.
It is meshed with a bevel gear 65 integrally formed on the rear end portion.

A clutch sleeve 66 is provided on the intermediate #@62 by spline fitting so that it can only slide freely, and the pawl on the circumferential surface of this sleeve 6617'3 engages with the pawl formed on the boss portion of the bevel gear 64. and the double enclosure @64 is coupled to the intermediate @62. In other words, the front wheel drive force output shaft 37 is connected to the differential case 56 by a transmission device including a bevel gear transmission mechanism 64,65'i.
, 64 and a clutch sleeve 66 provides a clutch that can drive the front wheels only when necessary.

As shown in FIG. 4, a multi-disc friction brake 67tl is provided at one end of the transmission 1i1148. This brake 67 has a pressure plate 68 for pressing the friction element group, and is housed in a cam groove between the plate 68 and the transmission case wall in order to slide the plate 68 in the direction of the friction element group by rotational displacement of the plate 680. A series of balls 69, prescia
It is fully equipped with an operating shaft 70 which is provided over the outside of the mission case 15 to rotationally displace the plate 68, a return spring 71 which pulls back the pressure plate 68 when the brake operating force is released, and so on.

Similarly, as shown in FIG.
1 is configured to operate by pushing a pressure ring 72 disposed inside the differential case 56 in the direction of the friction element group by means of a plurality of pins 73 extending between the inside and outside of the differential case 56. A pressure sensor is disposed inside the mission case 15 facing the circular surface of the mission case wall.
A ball bearing 75 is entirely disposed between the plate 74 and the bin 73. A -7 (7), t''-luer 6 is disposed between the pressure plate 74 and the inner surface of the discharge case wall, and each ball 76 is formed on the pressure plate 74 as shown in FIG. The groove 77 is accommodated across the corresponding cam groove on the inner surface of the mission case wall. Each cam groove has a cam surface that slopes cleanly in the circumferential direction. When the rotation operation is performed, the ball 76 is pushed in the direction of the plate 74, thereby displacing the pressure plate 74'i and thereby the differential case 56 of the bin 73 via the bearing 75.
After the inward displacement, the differential lock clutch 61 is fully activated. Pressure plate 74 'e circle f
'll-, it is necessary to throw the operating shaft 78 shown in FIG. 6 into and out of the mission case 15.
The operating shaft 78, which is rotatably operated by a differential lock pedal (not shown), is connected to the pressure plate 74 by connecting it to the external surface 74a of the pressure plate 74 through an arm 79 fixed thereto. is connected to. A two-way return spring is provided in the connection mechanism between the actuator 41i1178 and the differential lock pedal.

Structure of other parts The mower M is supported on the vehicle frame 10 via a link mechanism (not shown) at the elevator doorway, and is raised and lowered by a hydraulic cylinder (not shown). As shown in Fig. 1.2, the rotational drive is carried out by the power of the engine 11, the whole machine frame 10.
17'] to the mower drive pulley 82 in a horizontal position located in front of the clutch box 83 and the umbrella drive pulley 82.
! Take it out through 121 Iso Q484'l, and remove it from the upper and lower two stages from the motor drive pulley 82! This is done by belt transmission to the input pre-Ma of the Remoor M via the j-85.86ffi.

The mission case 15 also serves as an oil tank for storing oil supplied to the hydraulic transmission device 32 and oil supplied to the mower lifting hydraulic cylinder, and as shown in the third factor, the case 15I
A filter 88 for cleaning oil pumped out from the case circle is provided at the lower part of 7'3 in the left and right direction of the body.

The illustrated mower tractor operates by driving the rear part 16, and if necessary shifts the clutch sleeve 66 illustrated in FIG. Used for lawn mowing work. The vehicle speed is controlled by changing the gears of the hydraulic transmission device 22 and the mechanical transmission 45, and the vehicle can also be moved backward by rotating the hydraulic pump 24 of the hydraulic transmission device 22 in reverse rotation. The brake 67 shown in FIG. 4 is used for braking while the vehicle is running and when parking the vehicle, and the differential lock clutch 61 releases the function of the differential gear 46 in places where the driving conditions are poor. Used for the ninth time.

As mentioned above, the PTO shaft 4o extending rearward from the hydraulic transmission device 22 is used when performing stationary work such as pest control work using the power of the engine 11, or when applying fertilizer to the rear of the illustrated tractor using a pitch means. It is used to extract the necessary power when connecting other work equipment such as a machine or a feeder to perform other work.

Figures 7 and 8 show a nine mower tractor equipped with a transmission device according to a second embodiment of the invention.

For the mower tractor shown in Figure 7.8, the Engines 11
1.2, the engine 111 is supported at the rear of the vehicle frame 110, and the transmission device is supported at the front of the vehicle frame 110.

The front wheel 1 is the driving wheel that is constantly driven to rotate during the vehicle travel.
16, and the rear wheels 112, which are rotated by the operation of a steering wheel 118 to direct the aircraft, are rotationally driven only when necessary.

In such a tractor VC, a hydraulic power transmission device 1 receives all power input from an engine 111 at the rear of the machine body via a transmission shaft 123.
22 is installed at the forefront of the aircraft, and this hydraulic transmission device 122
A transmission case 115 housing a mechanical transmission to which all power is input from the hydraulic motor 134 is provided on the back of the lower half of the hydraulic transmission station 122, with the front half of the upper half completely overlapping. The left and right front wheels 116, which are rotatably driven by input power from a mechanical transmission in the mission case 115, are supported by the mission case 115 in exactly the same manner as the left and right rear wheels 16 in the first embodiment. ing.

As can be easily understood, the hydraulic transmission device 122 and the mechanical transmission inside the transmission case 115 are as follows.
The hydraulic transmission device 22 and the mechanical transmission in the mission case 315 in the embodiment described above can be reversed to form a mechanical transmission, and although illustration is omitted, this is actually the case. In FIGS. 7 and 8, all parts or members corresponding to the parts or members of the vehicle according to the above-described embodiment are designated by a larger number by the reference numeral F100 used earlier.

Also in the mower tractor shown in Fig. 7.8, in contrast to the structure in which the hydraulic transmission device 122 and the transmission case 115 are arranged to move forward and backward, the left and right front wheels are positioned at 116 positions, and the longitudinal width occupied by the hydraulic transmission device 122. The distance between the front wheel 116 and the rear wheel 112 is reduced by that amount9, ensuring the vehicle's small IP turning performance. The longitudinal width of the installation space for the mower M, which is installed on the top of the aircraft between the front wheel 116 and the rear wheel 112, is also the same as that between the front wheel 116 and the rear wheel 112 while reversing the front and rear of the hydraulic transmission device 122 and the transmission case 115. In contrast to a structure that provides the same spacing for f
'E, enlarged by fc.

Effects of the Invention This invention has an engine 11°11 installed at one end of the aircraft in the longitudinal direction.
In a self-propelled work vehicle mounted on a metal tower, hydraulic conduction bag f22
, 122 and a transmission case 15 that houses the mechanical transmission and supports the left and right drive wheels 16.116e,
115 in the front and back direction of the wall, engines 11 and 111
The hydraulic conduction bag @22.1.22 receiving input transmission from the engine is located at the engine reflector, and the transmission case 15.115 is located at the engine side, and the drive wheel 16
゜116 and wheels 12 and 112 provided on the engine side
If the distance between the wheels is made smaller than the conventional one by the front-to-back width occupied by the hydraulic transmission device, and if the above wheel spacing is set to the same distance as in the conventional wheel, then the front-to-back width occupied by the hydraulic transmission device will be reduced. Only υ is large, and the front or rear of the transmission case is 2) - #fist size stand I + kir1 sales 1σ) 4 incl. and space for the mid-mount type working machine, without any contradiction.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal side schematic side view of a mower tractor equipped with a first embodiment of the present invention, FIG. 2 is a schematic plan view of the mower tractor shown in FIG. 1, and FIG. Figure 1.2 is a partially omitted, partially longitudinal side view of the mower tractor shown in Figure 1.2, and Figure 4 is a partially expanded cross-sectional view of the 7t transmission case installed in the mower tractor shown in Figure 1.2. 5 is a rear view showing the transmission case and rear axle installed on the mower tractor shown in FIGS. 1-2, and FIG. 6 is a partially cutaway view of the transmission case shown in FIG. 4. The cutout schematic side view, FIG.
FIG. 8 is a schematic plan view of the mower tractor shown in FIGS. 10.110...Vehicle machine frame, 11,111...Carrot, 12...Front wheel, 112...Rear wheel, 15,11
5...Mission case, 16...Rear wheel<RTM wheel), 116...Front wheel (drive wheel), 20,120...
・・Axle, 21.121 ・・Transmission shaft, 22.122・
・Hydraulic transmission device, 23.123 ・Den iU'Fll
l, 24.124-...Hydraulic pump, 28...Mounting surface, 31,131...Axle case, 34.134
・Hydraulic motor, 35・°° motor support, 36...Bevel gear, 37.137...Working wheel drive force extraction shaft, 45...
Mechanical speed device, 46... Differential device, 47... Drive shaft, 48... Speed change shaft, 49... Umbrella car, 56...
Differential case, 57... Input gear, 59... Gear, 6
2...Intermediate shaft, 63...Gear, 64...Double surrounding table,
65...Bevel gear, 66...Clutch sleeve.

Claims (1)

[Claims] 1. In a self-propelled work vehicle with an engine mounted at one end in the longitudinal direction of the machine body, the hydraulic transmission device (22, 122) that receives power from the engine (11, 111) is connected to the machine body. The hydraulic motor (34, 134) of this hydraulic transmission device (22, 122) is installed at the extreme end of the fuselage on the other end side in the longitudinal direction.
) Inside the hydraulic transmission device (22, 122), the transmission case (15, 115) housing the mechanical transmission that receives power from the
The upper half of the hydraulic transmission device (22, 122) is installed so as to overlap with the lower half of the hydraulic transmission device (22, 122), and left and right drive wheels (16, 122,
116) is supported by the transmission case (15, 115), and is a transmission device for a self-propelled work vehicle. 2. The transmission device according to claim 1, wherein the mechanical transmission receives input transmission from the hydraulic motor (34); and the mechanical transmission (45). Differential device (46) that receives input conduction from and performs output conduction in the left and right direction of the aircraft.
The mechanical transmission (45) is connected to the hydraulic transmission device (45) in the mission case (15).
22), and the differential device (46) is disposed on the opposite side, respectively. 3. The transmission device according to claim 2, wherein the mechanical transmission device (45) has bevel gear transmission mechanisms (36, 49) relative to the motor shaft (35) of the hydraulic motor (34). ) is arranged between a drive shaft (47) which is interlocked and arranged along the left and right direction of the aircraft and a transmission shaft (48) which is arranged parallel to this drive shaft (47).
Transmission device for self-propelled work vehicles. 4. The transmission device according to claim 3, wherein the speed change shaft (47) is lower than the drive shaft (47).
48) A transmission device for a self-propelled work vehicle, with the side located at the lower level. 5. The transmission device according to any one of claims 2 to 4, wherein the power is for rotationally driving the left and right wheels (12) located on the engine (11) side. The wheel drive force extraction shaft (37)
The transmission case (15) is provided so as to extend from the upper part thereof toward the engine (11), and the wheel drive force extraction shaft (37) is connected to the differential case (5) of the differential device (46).
A transmission device for a self-propelled work vehicle, which is interlocked with 6) by a transmission device including a bevel gear transmission mechanism (64, 65). 6. The transmission device according to claim 5, wherein the transmission device is provided with the differential device (46) and the wheel drive force extraction shaft (37) in the upper part of the mission case (15). an intermediate shaft (62) provided along the left-right direction of the aircraft between the two; and a gear (62) fixedly installed on the intermediate shaft (62) and meshed with the input gear (57) of the differential device (46). 63), a bevel gear (64) loosely fitted onto the intermediate shaft (62), and the intermediate shaft (62).
a clutch sleeve (66) that is slidably provided on the top and can be selectively coupled to the intermediate shaft (62) of the bevel gear (64); and a clutch sleeve (66) that is fixedly installed on the wheel drive force extraction shaft (37). and a bevel gear (65) meshed with the bevel gear (64).