JPS6025288B2 - front wheel drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front wheel drive device for a military vehicle such as a tractor.

A conventional front wheel drive device for a four-wheel drive vehicle such as a tractor has a front wheel case pivoted to both ends of the front axle case so as to be rotatable around a king pin, and a deceleration bevel gear mechanism attached to the front wheel case. An axle linked to the king pin is rotatably inserted and supported, and the front wheel is attached to a flange formed at the outer end of the axle, but this method has the following drawbacks.

That is, since the axle is rotatable and the front wheel is attached to it, it is necessary to support the axle at two locations sandwiching the bevel gear, which increases the size of the front wheel case. As a result, the axle naturally becomes longer and the distance to the flange becomes longer.
The front wheel cannot be placed close to the kingpin side,
The support of the front wheel becomes unstable and at the same time, the tread of the front wheel cannot be reduced by 4 degrees. Furthermore, since the axle is also supported on both sides, it is necessary to separate the front wheel case, which complicates the structure and complicates the assembly work. The present invention aims to solve these conventional problems, and its feature is that the front wheel case that supports the front wheel is attached to both ends of the front axle case and rotates around the king pin. In a front wheel drive device that is freely pivotable and has a bevel pinion of a king pin and a bevel gear that fits together with the bevel pinion of the king pin and transmits special force to the front wheels built in the front wheel case,
An axle that projects outward in the lateral direction is integrally provided on the inner wall of the front wheel case, and the bevel gear is rotatably mounted on the outer periphery of the axle so as to be dovetailed with the bevel pinion at the inner end in the lateral direction. The main point is that the front wheel is attached to the outer end of the bevel gear in the lateral direction.

The present invention will be described in detail below with reference to the illustrated embodiments. In FIGS. 1 and 2, 1 is a tractor body, engine 2 is
, a transmission case 3, etc. as a structure, and a front axle frame 4 is attached to the engine 2 so as to project forward.

Reference numeral 5 designates a front axle case, which includes a differential storage portion 7 that accommodates the differential device 6, a pair of left and right cylindrical portions 9 surrounding each of the differential fork shafts 8 of the differential device 6, and an outer end of the cylindrical portion 9. The front axle case 5 is integrally formed with a bevel gear case 11 that houses a bevel gear mechanism 10 by casting or the like. The body 13 is supported on the front axle frame 4 by a pair of front and rear bearing stands 14 and 15.

The differential housing part 7 of the front axle case 5 is formed to have a larger diameter than the cylindrical part 9, as shown in FIGS. 3 to 5, and the differential housing part 7 has a circular shape that closes at the rear. A checkpoint section 16 is provided.

The differential holding body 13 includes a lid part 17 that closes the closing part 16, a boss part 18 that projects rearward from the rear center part of the lid part 17,
It is formed integrally with a pair of left and right bearing arms 19 that protrude into the differential housing part 7 from the lid part 17, and can be freely attached to and detached from the differential housing part 7 by a plurality of bolts in the circumferential direction via the lid part 17. attached. A bevel pinion shaft 2 is attached to the boss portion 18.
1 is rotatably inserted and supported via bearings 22 and 23, and its bevel pinion shaft 21 is connected to a power take-off device attached to the lower abdomen of the mission case 3 via a propulsion shaft in a propulsion shaft cover 24. 25. The differential device 6 has a bevel gear 27 aligned with the bevel pinion 26 of the bevel pinion shaft 21, and a pair of left and right ball bearings 28.
It is rotatably supported by a bearing arm 19 via.
The bevel gear mechanism 10, as shown in FIG. 6, includes a bevel gear 29 provided at the outer end of the defky fork shaft 8, and a bevel gear 31 provided with a king pin 301 to engage with the bevel gear 29.

The bevel gear 29 is attached to a spline shaft portion 32 formed at the outer end of the defyoke ratchet 8, and is attached to a ball bearing 3.
5 and is rotatably held by a bevel gear case 11. The bevel gear 31 is splined to the upper end of the king pin 30 and rotatably held by the bevel gear case 11 via roller bearings 36'. As shown in FIGS. 6 and 8, the bevel gear case 11 is formed with an inclined entrance portion 36 that faces each end of the deferoke shaft 8 and the king pin 30 and closes obliquely outward and upward.
A case lid 38 is removably attached to a forehead slant mounting surface 37 around the slanted opening 36 with a plurality of bolts 39 so as to close the slanted opening 36. As shown in FIG. 7, the inclined closing portion 36 is large enough to allow the bevel gears 29, 31 to be attached to the defyoke shaft 8 and the king pin 30', and the front and rear mounting seats 40 are large enough to attach the bevel gears 29, 31 to the defyoke shaft 8 and the king pin 30'. It is located in between and is formed to protrude inward. The bevel gear case 11 integrally has cylindrical shaft parts 41 and 42 at the lower end and the case lid 38 at the upper end, respectively, and the cylindrical shaft parts 41 and 42 are formed on the same axis with respect to the king pin 30. A front wheel case 44 that supports a front wheel 43 is rotatably pivoted around the king pin 30 by the cylinder shaft portions 41 and 42. As shown in FIG. 6, the front wheel case 44 has a substantially L-shape in rear view, integrally comprising a lower case 45 and a side case 46, and has a reduction bevel gear mechanism 49 consisting of a bevel pinion 47 and a bevel gear 48. Built-in.

The lower case 45 has a mantle portion 5 rotatably attached to the cylindrical shaft portion 41 of the bevel gear case 11 via a bush 50.
1 and a stepped portion 52 located below the cylindrical shaft portion 41.
A thrust pole bearing 53 is interposed between the step portion 52 and the step portion 52 . Further, a bevel pinion 47 is rotatably supported at the lower end of the lower case 45 via a ball bearing 54, and this bevel pinion 47 is spline-coupled to the lower end of the king pin 30. The side case 46 has a large-diameter entrance portion 55 that closes laterally outward and allows the bevel gear 48 to be inserted and removed, and has an axle shaft 57 that projects outward from the inner wall 56.
A bevel gear 48 is rotatably mounted on this axle 57 via two ball bearings 58 and 59. Note that the axle 57 is formed into a hollow shape to reduce weight. The bevel gear 48 is integrally provided with a boss portion 62 on the outer side in the inguinal direction with respect to the tooth portion 601, and has a ninth boss portion 62.
As shown in the figure, a plurality of ribs 62 are provided on the outer periphery of the boss portion 61 at equal intervals in the circumferential direction, and are integrally formed by forging or the like. Further, the bevel gear 481 is provided with a sealing surface 63 concentrically adjacent to the tooth portion 60, and each rib 62 is provided so as not to protrude outward from the sealing surface 63 in the direction of the collar. Each of the ribs 62 also serves as the above-mentioned mounting portion, and has a flush outer end surface in the axial direction, and a screw hole 64 for a bolt is formed in each end surface. An oil seal 65 housed in the opening 55 of the front wheel case 44 is arranged on the seal surface 63, and the oil seal 65 is connected to a protective ring 67 fixed to the case 44 by bolts 66. protected from the outside in the axial direction. The front wheel 43 includes a wheel disk 68, which is detachably attached to the outer end surface of the rib 62 of the bevel gear 48 by a plurality of bolts 69 screwed into the screw holes 64. The wheel desk 68 is configured such that a mounting portion 69 is offset to one side from the axial center of the front wheel 43, and reinforcing bulges 71 are formed on the periphery of the mounting portion 69 alternately with the bolt holes 40. Therefore, the tread of the front wheel 43 can be adjusted by reversing mounting, and when the tread is enlarged, the bulge 71 corresponds to the notch 72 between the ribs 62. A lid 73 is attached to the outer end of the boss portion 61 of the bell gear 48. Side case 4 of the previous case 44
A steering arm 75 is attached to the upper end of the 6 by bolts 74. The steering arm 75 has a bottomed iron fitting part 76 that opens downward in the middle part, and the iron fitting part 76 is attached to the case lid 38.
The mantle is rotatably attached to the barrel portion 42 which is provided in a protruding manner via a bush 78. Note that the steering arm 75 is operatively connected to a handle 79. There is an opening □ in the cylindrical shaft portion 42 of the case lid 38.
A section 80 is formed. 81 is a sealing material, and 82 is a rear wheel.

Next, the operation of the above configuration will be explained.

During running, the power extracted from the power extraction device 25 is
Propulsion shaft, bevel pinion shaft 21, bevel pinion 26,
It is transmitted to the differential gear 6 via the bevel gear 27. The differential device 6 operates according to the load on each front wheel 43, and the differential gear 6 is connected to the bevel gear 29 and the bevel gear 3 from the differential fork shaft 8.
1. It is transmitted to the bevel gear 48 via the king pin 30 and the bevel pinion 47, and the rotation of the bevel gear 48 around the axle 57 drives the front wheel 43. Of course, at this time, the rear wheels 82 are also being driven, and the vehicle travels by reciprocating the outside of the truck. When assembling the differential device 6 to the front axle case 5, the bevel pinion shaft 21 etc. are attached to the holder 13.
bevel pinion shaft 21 and bevel gear 2.
After making necessary adjustments such as backlash with 7, the holding body 13 is inserted into the differential housing part 7 through the opening 16, and the holding body 13 is fixed to the front axle case 5 via the lid body 17.

Since the bevel gear case 11 is provided with the inclined closing part 36, during assembly, the differential fork shaft 8 can be inserted from the inclined closing part 36 through the cylindrical part 9 into the differential device 6 of the differential housing part 7, and therefore the front The differential accommodating portion 7, the cylindrical portion 9, and the bevel gear case 11 of the axle case 5 can be integrated by casting or the like as shown, and the strength is significantly improved.

In addition, since the opening portion 36 is inclined, a sufficient opening area can be secured, and the bevel gears 28 and 31 can be easily assembled.
The slanted closing portion 36 is closed with a case lid 38 bolted to the slanted mounting surface 37, but since it is a slanted mounting surface 37, even if a sufficient area for the mounting surface is secured, the mounting portion itself cannot be shaped like a flange. There is no need to extend the front wheel 43 along the periphery, and the front wheel 43 can be rotated around the king pin 30 because it is located inside between the front and rear mounting seats 4 river bell gears 29 and 31. Even at times, interference between the front wheel case 44 and the side case 46 can be prevented, and the turning angle of the front wheel 43 can be increased. Furthermore, no heavy load is applied to the bolt 39 itself, and there is no chance of loosening or breaking. When assembling the bevel gear 48 into the front wheel case 44, the bevel gear 48 is fitted onto the axle 57 via the ball bearings 58, 59, and then the oil seal 65 is iron-bonded to the closing portion 55 of the side case 46. It is only necessary to attach the protective ring 67, and assembly is extremely easy.

Further, since the axle 57 is integrated with the inner wall 56 of the side case 46, its axis is stable, and machining and assembly accuracy can be easily ensured. Since the bevel gear 48 is wrapped around this fixed axle 57, the front wheel 43 is attached to the outer end surface of the bevel gear 48.
wheel desk 68 can be installed, and an axle flange is not required. In particular, the wheel disk 68 is mounted using a rib 62 formed on the outer periphery of the boss portion 61 of the bevel gear 48, and a screw hole 64 is formed in the outer end surface of the rib 62, so that the mounting pitch of the wheel disk 68 can be set sufficiently. You can make it bigger. When adjusting the tread of the front wheel 43,
Install this upside down.

That is, when making the tread of the front wheel 43 smaller, the sixth
Attach the wheel desk 68 as shown in the upper half of the figure,
In addition, when changing the tread significantly, the front wheel 43 is mounted upside down as shown in the lower half of the figure. In this case, the bulge 71 of the wheel disk 68 is located in the notch 72 between the ribs 62, so there is no interference between the bulge 71 and the ribs 62. Therefore, even if the bulges 71 are radial, the mounting position can be set radially outward regardless of this. Since the bevel gear 48 has a large diameter, a cast gear is used. When casting this gear, the notch 72 between the ribs 62 is
acts as a relief part and can absorb distortion.

Incidentally, as shown by imaginary lines in FIG. 6, the flange portion 83 may be integrally formed at the outer end of the bevel gear 48 and the rib 62 may be omitted.

Further, the axle 57 may be attached to the inner wall 56 with bolts or the like. In the present invention, the axle that protrudes laterally outward is integrally provided on the inner wall of the front wheel case, and the bevel gear is rotatably mounted on the axle, so that the support is lower than that of a case where the axle rotates. The structure is simple and stable, and since cantilever support can be used, the axial length of the axle can be reduced, which is advantageous in terms of strength, and the structure of the front wheel case can be simplified.

Moreover, the bevel gear that is wrapped around the outer circumference of the axle fits with the bevel gear of the king pin on the inner end side in the lateral direction, and the front wheel is attached to the outer end of this bevel gear in the lateral direction, so the front wheel is placed on the king pin side. They can be placed closer together, making it more compact, and the front wheel tread can be made smaller. Furthermore, since the overall structure is simpler, it can be made smaller and
Assembly work is also easy.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, the first being a side view and the second being a side view.
The figure is a rear view of the front wheel support part, Figure 3 is a partially cutaway side view, Figure 4 is a view taken along the W-W arrow in Figure 3, and Figure 5 is a V-V in Figure 3.
Fig. 6 is a sectional view of the front wheel drive section, Fig. 7 is a partially cutaway plan view of the oblique closing portion, Fig. 8 is a partially cutaway rear view of the front wheel drive section, and Fig. 9 is a bevel gear. FIG. 1...Tractor body, 5...Front axle case, 11...Bevel gear case, 30...King pin, 43...Front wheel, 44... Front wheel case, 45... Lower case, 46... Side case, 48... Bevel gear, 49...
- Attenuation bevel gear mechanism, 57... Axle, 61...
...Pos section, 62...Rib, 62...Wheel disc. Figure 1 Figure N Rudder Diagram Mountain Boat Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 A front wheel case 44 supporting a front wheel 43 is pivotally attached to both ends of the front axle case 5 so as to be rotatable around the king pin 30, and a bevel pinion 47 of the king pin 30 is engaged with the bevel pinion 47 of the king pin 30 in the front wheel case 44. In a front wheel drive device that includes a built-in bevel gear 48 that transmits power to the front wheels 43, an axle 57 that projects laterally outward is integrally provided on the inner wall of the front wheel case 44, and a A front wheel drive device characterized in that the bevel gear 48 is rotatably fitted on the bevel gear 48 so as to engage with the bevel pinion 47 at the inner end side in the direction, and a front wheel 43 is attached to the outer end portion of the bevel gear 48 in the lateral direction. .