JPH0834253A - Front wheel output shaft support structure of four-wheel drive type work vehicle - Google Patents

Abstract

PURPOSE:To simplify a support structure of a first front wheel output shaft and a second front wheel output shaft in a four-wheel drive type work vehicle which transmits power from transmission case in a rear part of a vehicle body to an input shaft of a front axle case through a first front wheel output shaft, a universal joint, and a second front wheel output shaft. CONSTITUTION:A bearing section 29 and a seal member 30 at an end on a universal joint 31 side of a first front wheel output shaft and a second front wheel output shaft and a cover 32 which is provided with a support member 24 supported on a fixing section 4a of a vehicle body and covers the universal joint 31 are supported on the support member 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention arranges an engine in a front part of a machine body and a mission case in a rear part of the machine body, transmits power from the engine to the mission case, performs gear shift operation, and transmits to rear wheels. The present invention relates to a front wheel output shaft support structure for a four-wheel drive work vehicle configured to transmit power from a mission case to front wheels.

[0002]

2. Description of the Related Art An example of a four-wheel drive type work vehicle as described above is disclosed in Japanese Utility Model Laid-Open No. 54-116334. With this structure, the power from the mission case at the rear of the fuselage is transmitted to the first front wheel output shaft, the universal joint and the second
It is configured to be transmitted to the input shaft (8 in FIG. 1 of the above publication) of the front axle case via the front wheel output shaft.

[0003]

In the four-wheel drive type work vehicle as described above, it is necessary to support the vicinity of the universal joint that connects the first and second front wheel output shafts. In terms of saying, there is room for improvement.
SUMMARY OF THE INVENTION It is an object of the present invention to simply configure the support structure of the first and second front wheel output shafts from the mission case at the rear of the machine body to the front axle case in a four-wheel drive type work vehicle.

[0004]

The feature of the present invention resides in that the front wheel output shaft support structure for a four-wheel drive type work vehicle as described above is configured as follows. That is, the power from the mission case at the rear of the machine is configured to be transmitted to the input shaft of the front axle case via the first front wheel output shaft, the universal joint, and the second front wheel output shaft. 2 A support member for supporting the bearing portion and the seal member at the end portion of the front wheel output shaft on the side of the universal joint to the machine body fixing portion, and a cover member for covering the universal joint connecting the first and second front wheel output shafts. Supported by.

[0005]

When configured as in the present invention, for example, FIGS.
As shown in, the support member 2 fixed to the machine body fixing portion 4a
4, the end portion of the second front wheel output shaft 9 on the side of the universal joint 31 (or the end portion of the first front wheel output shaft 8 on the side of the universal joint 31) is supported via the bearing portion 29. A seal member 30 for 29 is supported by the support member 24. Then, the cover 32 of the universal joint 31 located near the support member 24
Are supported by the support member 24.

In this way, the first or second front wheel output shaft 8,
The support member 24 supports the cover 32 of the universal joint 31 by supporting the vicinity of the universal joint 31, which is the end portion of the universal joint 31 side of 9, by the support member 24. No special support member is required. Also, a dedicated support member for the seal member 30 is not necessary.

[0007]

As described above, in the four-wheel drive type work vehicle, the support members for the first and second front wheel output shafts from the mission case at the rear part of the machine body to the front axle case are connected to the universal joint cover and the seal member. Since it can be used also as a support member, the support structure for the first and second front wheel output shafts can be simplified, and an advantageous configuration in terms of production cost can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the engine 3 and the main clutch 4 are arranged in the front part of the airframe supported by the pair of left and right front wheels 1 and the rear wheels 2, and the control part 5 and the mission case 6 are arranged in the rear part of the airframe, and the four wheels are arranged. An agricultural tractor that is an example of a drive-type work vehicle is configured. The power from the engine 3 is transmitted to the mission case 6 via the main clutch 4 and the transmission shaft 7, is gear-shifted by a transmission device (not shown) in the mission case 6, and is transmitted to the left and right rear wheels 2. . As shown in FIG. 2, the power branched just before the rear wheel 2 is transmitted from the transmission case 6 to the front wheel transmission 10 via the first front wheel output shaft 8 and the second front wheel output shaft 9, and the front wheel transmission 10 Is transmitted to the left and right front wheels 1 via the front axle case 11.

Next, the front axle case 11 and the front wheel transmission 1
The 0 support structure will be described. As shown in FIGS. 5 and 2, one rectangular support plate 13 is fixed over the left and right frames 12 at the front of the machine body, and the first support bracket 14 and the support plate 13 are provided on the front part of the support plate 13. The second support bracket 15 is fixed to the rear portion of the unit 13. Front axle case 11
A pair of cylindrical support boss portions 11 on the front and rear surfaces at the center of the left and right of the
a and 11b are fixed, and the front and rear support bosses 11
a and 11b are inserted into the first and second support brackets 14 and 15, so that the front axle case 11 has an axis P in the longitudinal direction of the machine body.
It is supported so that it can be rolled around 1.

As shown in FIGS. 3 and 2, the front wheel transmission 1
The case 16 that accommodates 0 has a bottom formed on the rear side of the machine body (right side of FIG. 3) and the front side of the machine body (left side of the plane of FIG. 3).
Has a large open surface. The open surface of the case 16 is connected to the surface of the second support bracket 15 opposite to the front axle case 11 with the front wheel transmission 10 installed therein.

Next, the front wheel transmission 10 will be described. As shown in FIGS. 3 and 2, the front wheel transmission 1 extends from the case 16 to the rear side of the machine body (the side opposite to the front axle case 11).
The 0 input shaft 17 projects, and the input shaft 17 and the second front wheel output shaft 9 are connected via a sleeve 18. Input shaft 1
7 and the output shaft 19 of the front wheel transmission 10 are arranged so as to be rotatable relative to each other in a concentric manner, and are arranged in the support boss portion 11b of the front axle case 11 (in the second support bracket 15). The input shaft 20 of the axle case 11 and the output shaft 19 of the front wheel transmission 10 are connected by a spline structure.

A transmission shaft 21 is arranged in parallel to the side of the input shaft 17 and the output shaft 19, and the transmission gear 1 of the input shaft 17 is arranged.
7a and the transmission gear 21a of the transmission shaft 21 mesh with each other.
The speed increasing gear 22 is fitted onto the output shaft 19 by a needle bearing so as to be relatively rotatable, and the transmission gear 21b of the transmission shaft 21 and the speed increasing gear 22 are meshed with each other. A shift member 23 having a spline structure is externally fitted to the output shaft 19 so as to be integrally rotatable and slidable, and a steering mechanism (not shown) for the front wheel 1 and a shift member 23 are provided with a cam mechanism (not shown). Are mechanically linked by.

With the above-described structure, when the front wheel 1 is steered within the straight traveling position or within the left and right set angles sandwiching the straight traveling position, the shift member 23 is slid rightward on the paper surface as shown in FIG. The protrusion 23a of the shift member 23 meshes with the protrusion 17b of the transmission gear 17a. In this state, the input shaft 17 and the output shaft 19 are connected to each other, and the power transmitted to the input shaft 17 is transmitted to the front wheel 1 via the output shaft 19 and the input shaft 20 in a standard state, so that the front wheel 1 and the rear wheel 1 2 and 2 are driven at substantially the same speed.

Next, when the front wheel 1 is steered over the set angle, the shift member 23 is slid to the left in the drawing of FIG. 3, and the protrusion 23b on the opposite side of the shift member 23 is moved to the speed increasing gear 22. It engages with the protrusion 22a. In this state, the power transmitted to the input shaft 17 is transmitted to the front wheels 1 in an increased speed via the transmission shaft 21, the speed increasing gear 22, the output shaft 19 and the input shaft 20, so that the front wheels 1 are more than the rear wheels 2. Also becomes a speed-up state in which it is driven at a high speed, and a small turn is smoothly performed by the speed-up action of the front wheels 1.

Next, the support structure of the second front wheel output shaft 9 will be described. As shown in FIGS. 4, 6 and 2, a plate member having an inverted triangular shape is subjected to press working to form a ring-shaped step portion 24a and a pair of mounting portions 24b to form a support member 24, A ring member 25 that is obtained by rolling a plate material into a cylindrical shape.
Are welded and fixed along the outer periphery of the stepped portion 24a of the support member 24. A nut 34 is welded and fixed to a support plate 33 formed by bending a rectangular plate material into an L-shape in a side view. The nut 34 and a bolt 35 allow the pair of mounting portions 24b of the support member 24 to form a flange portion of the main clutch 4. It is connected to the lower part of 4a (corresponding to the machine body fixing part). In this case, the end portion of the support plate 33 is brought into contact with the outer surface of the first cover 26 described later to prevent the support plate 33 and the nut 34 from rotating.

As shown in FIGS. 2 and 4, the end portion of the cylindrical first cover 26 that covers the second front wheel output shaft 9 is supported by the step portion 24a of the support member 24, and the second front wheel output shaft is formed. The end portion of the cylindrical second cover 27 that covers 9 is provided with the front wheel transmission 10
Is supported by the case 16 of the first and second covers 2
6, 27 are connected to each other by a ring member 28. As shown in FIG. 4, a protrusion 26 a that faces inward is partially formed near the end of the first cover 26, and the bearing 29 is provided between the protrusion 26 a and the step 24 a of the support member 24. (Corresponding to the bearing portion) and the seal member 30 are arranged, and the bearing 29 and the seal member 30 are positioned by the protrusion 26a and the step portion 24a.

With the above structure, the first and second covers 2
6 and 27, the body front side of the second front wheel output shaft 9 is connected to the input shaft 17 of the front wheel transmission 10 by the sleeve 18, and the body rear side of the second front wheel output shaft 9 is supported by the bearing 29. The front wheel output shaft 9 is connected to the first front wheel output shaft 8 via the universal joint 31. A cover 32 that covers the vicinity of the universal joint 31 is provided, and the cover 32 is supported by the ring member 25 of the support member 24.

As shown in FIG. 1, the main clutch 4 at the front of the machine body
The transmission case 6 at the rear of the machine body is connected by a box-shaped main frame 43. In this case, a main frame 43 as shown in FIG. 7 is cut out from one metal flat plate into a flat plate shape, various holes are punched out, and the main frame 43 is bent at a pair of left and right bending lines A shown by a dashed line to obtain the result shown in FIG. A main frame 43 having a C-shaped cross section as shown is manufactured. Then, as shown in FIG. 1 and FIG.
3 is welded and fixed to the main clutch 4 and the transmission case 6 by bolts.

As shown in FIGS. 7 and 8, the main frame 4
A pair of boss portions 45 are welded and fixed to the central hole 43a of the shaft 3, and a single support shaft 46 is rotatably supported across the left and right boss portions 45. A boss portion 47 is fitted on the left side of the support shaft 46 so as to be relatively rotatable, and a main clutch pedal 48 is supported by the boss portion 47. A boss portion 49 is fixed to the inner right side of the support shaft 46, and a boss portion 50 is externally fitted to the outer right side of the support shaft 46 so that the right and left side brake pedals 36 and 37 are supported by the boss portions 49 and 50. There is. In this case, groove-shaped grease reservoirs 46a are formed on the outer surfaces of the support shafts 46 of the left and right bosses 47, 50, and O-rings 51 are arranged on both sides of the reservoirs 46a. As a result, grease is collected at the time of assembling the support shaft 46 and the like.
After that, it is not necessary to replenish the grease thereafter.

The above-mentioned right and left side brake pedals 3
In FIGS. 6 and 37, the left side brake pedal 37 is directly welded and fixed to the pedal rod 38 as shown in FIG. 8, whereas in the right side brake pedal 36 as shown in FIGS. 9 and 8. A support pipe 39 is fixed to the right side brake pedal 36, and the support pipe 39 is connected to the pedal rod 38 by a bolt 40. This is because, as shown in FIG. 8, the right side brake pedal 36 comes out a little from the right step 41 of the control section 5, so that the right side brake pedal 36 can be removed during transportation by a truck or the like. .

As shown in FIGS. 10 and 11, a right step 41 and a left step 42 are bolted to the left and right of the main frame 43, and one rubber piece is provided over the main frame 43 and the right and left steps 41, 42. A mat 52 made of metal is laid. Two holes 41a, 4 in the right step 41
1b and two recesses 41c, 41d are formed,
The left step 42 has one opening 42a and a recess 42b. On the other hand, in the mat 52, the openings 52a, 52b, 52c, 52d, 52e, 52f are provided at positions corresponding to the openings 41a, 41b, 42a and the recesses 41c, 41d, 42b of the right and left steps 41, 42. And a slit 52g is provided for each of the openings 52a to 52f.

In this agricultural tractor, the mission case 6
The HST specification equipped with a hydrostatic continuously variable transmission (not shown) at the front of the vehicle and the gear shift specification not equipped with the continuously variable transmission will be produced. In case of HST specification,
The right and left side brake pedals 36 and 37 are connected to the opening 41a of the right step 41 and the recess 41c (the opening 5 of the mat 52).
2a, 52b), the main clutch pedal 48 at the position of the recess 42b of the left step 42 (the hole 52e of the mat 52), and the forward speed change pedal 53 for the continuously variable transmission at the position of the recess 41d (mat of the right step 41). 52, the reverse transmission pedal 54 for the continuously variable transmission is located at the position of the opening 41b of the right step 41 (the opening 52d of the mat 52), and the diff lock pedal 55 is located at the position of the left step 42. 42
It is arranged at a position (aperture 52f of mat 52).

In the case of the gear shift specification, the right and left side brake pedals 36 and 37 are connected to the opening 41 of the right step 41.
a and recess 41c (openings 52a and 52b of mat 52)
Position of the main clutch pedal 48 to the recess 42b of the left step 42 (opening 52e of the mat 52), and the accelerator pedal 56 to the recess 41d of the right step 41 (mat 5).
2 to the position of the opening 52c), the diff lock pedal 55 to the opening 41b of the right step 41 (opening 52d of the mat 52).
The hole 42a of the left step 42 (the hole 52f of the mat 52) is not used.

Next, the mounting structure of the side panels 57 located on the left and right of the engine 3 will be described. As shown in FIG. 12, a pair of protrusions 5 are formed on the lower side of the side panel 57.
7a are formed, pocket-shaped insertion portions 4b formed on the left and right of the main clutch 4, and the left and right frames 1
2 to the opening (not shown) of the bracket 58 fixed to
The convex portion 57a of the side panel 57 is inserted from above. A pair of left and right brackets 6 are attached to a gate-shaped frame 59 fixed to the upper part of the main clutch 4 and a front-side gate-shaped frame 62.
0 is fixed, and as shown in FIGS. 13 and 14 (a) and (b), a V-shaped bent spring wire 61 is attached to the opening 60a of the bracket 60. Thereby, the convex portions 57b on the front and rear of the upper portion of the side panel 57 are
The upper portion of the side panel 57 is fixed by inserting the spring wire 61 into the opening 60a of the bracket 60 so as to push the spring wire 61 leftward and rightward.

[Other Embodiments] In the embodiment of FIG. 2, the front wheel transmission 10 is provided between the second front wheel output shaft 9 and the input shaft 20 of the front axle case 11, but this front wheel transmission 10 is used. The second front wheel output shaft 9 may be directly connected to the input shaft 20 of the front axle case 11 without being provided. In the embodiment of FIG. 4, the depth of the step portion 24a of the support member 24 to the right side of the drawing may be set to be large, and the bearing 29 and the seal member 30 may be supported by the step portion 24a. The support member 24 of FIG. 4 may be configured to support the end of the first front wheel output shaft 8 on the side of the universal joint 31.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

1] Overall side view of an agricultural tractor

FIG. 2 is a vertical sectional side view of the front axle case, the front wheel transmission, and the first and second front wheel output shafts.

FIG. 3 is a vertical sectional side view of the second support bracket of the front axle case, the front wheel transmission, and the vicinity of the case.

FIG. 4 is a vertical cross-sectional side view of a supporting member in the vicinity of a connection portion between first and second front wheel output shafts.

FIG. 5 is a vertical cross-sectional rear view near the second support bracket of the front axle case.

6 is a front view of the vicinity of the support member of FIG. 4 as viewed from the left side of the drawing.

FIG. 7 is a plan view showing a state of the main frame before being bent.

FIG. 8 is a vertical cross-sectional rear view near the main clutch pedal and the right and left side brake pedals.

[Fig. 9] Side view near the right side brake pedal

FIG. 10 is a plan view of the main frame, right and left steps.

FIG. 11 is a plan view of a main frame, a mat laid on the right and left steps.

FIG. 12 is a side view near the engine and the side panel.

FIG. 13 is a side view of a bracket that fixes the upper portion of the side panel.

FIG. 14 is a cross-sectional plan view showing a state before and after attaching the upper convex portion of the side panel to the bracket.

[Explanation of symbols]

 4a Airframe fixing part 6 Mission case 8 First front wheel output shaft 9 Second front wheel output shaft 11 Front axle case 20 Front axle case input shaft 24 Supporting member 29 Bearing part 30 Sealing member 31 Universal joint 32 Cover

Claims (1)

[Claims] 1. Power from a transmission case (6) at the rear of the fuselage is transmitted through a first front wheel output shaft (8), a universal joint (31) and a second front wheel output shaft (9) to a front axle case (11). Of the first front wheel output shaft (8) or the second front wheel output shaft (9) at the end of the universal joint (31) side and the seal (29) and the seal. The support member (24) for supporting the member (30) on the body fixing part (4a) is provided,
And a front wheel output shaft of a four-wheel drive type work vehicle in which a cover (32) covering a universal joint (31) connecting the second front wheel output shafts (8) and (9) is supported by the support member (24). Support structure.