JPS6219442Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of the front axle of a vehicle such as a tractor.The present invention relates to the structure of the front axle of a vehicle such as a tractor. It is an object of the present invention to enable a support member to be firmly and suitably fixed.

For example, in a tractor, a pair of king pin support members are fixed to both ends of a cylindrical front axle by welding, but in the past, the front axle usually had the same shape over its entire length in the width direction. For this reason, conventionally, when attempting to securely fix the front axle and the king support member by increasing the length in the vertical direction of the fixed portion of the front axle and the king support member, the front axle is There was a problem in that the length was large and the ground clearance at the center in the width direction was low. Additionally, if the front axle and the king pin support member are to be appropriately welded by making the length of both ends of the front axle in the longitudinal direction small enough to correspond to the king pin support member, the front axle will be welded over the entire length in the width direction. As a result, there was a problem in that the length in the longitudinal direction became smaller and the strength of the front axle was reduced.

The present invention solves all of the above problems, and its feature is that, in the front axle to which a pair of king pin support members are fixed to both ends, the top wall side of the front axle is formed horizontally. At the same time, the bottom wall side is formed into an upwardly curved convex shape, and the length of both ends of the front axle in the vertical direction is larger than that of the center part in the width direction. In addition, the rear wall side is formed in a curved protrusion shape toward the rear, so that the widthwise central portion of the front axle is made longer in the longitudinal direction than both side portions thereof.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIGS.
It consists of a series of . Reference numeral 4 denotes a frame projecting forward from both sides of the engine 3, and a pair of left and right side plates 5 in the shape of a groove with the opening side facing outward.
and a connecting plate 6 that connects these front ends. A radiator 7 is mounted on the frame 4 and covered with the engine 3 by a bonnet 8. Reference numeral 9 denotes a front wheel bearing stand, which, as shown in FIG. 3, is shaped like a plate made of sheet metal, is placed below the radiator 7 in front of the engine, and is fixed to the left and right side plates 5 of the frame 4. . 10
is the front axle, as shown in Figures 4 and 5.
A groove-shaped main member 11 that is installed horizontally in the width direction on the lower side of the front vehicle bearing stand 9 and is made of sheet metal and has a rectangular tube shape and opens on the lower side, and a central part side in the width direction of the main member 11. A groove-shaped central side lid member 12 that closes the lower opening is spot-welded to a pair of left and right groove-shaped side lid members 13 that close the lower opening on both sides of the main member 11. It is composed of The outer end of the center side lid member 12 and the side side lid member 13
The inner ends of the two are overlapped and spot welded. The top wall 14 of the main member 11 is horizontal (or may be substantially horizontal), and its front and rear walls 15 and 16 are vertical, but the front wall 15 is located on the front side.
Further, the rear wall 16 is formed in a curved protrusion shape on the rear side, and the widthwise central portion of the front axle 10 is longer in the front-rear direction than its both end portions. Further, the bottom wall 17 formed by the cover members 12 and 13 of the front axle 10 is formed in a curved shape upwardly, and the length of both sides of the front axle 10 in the vertical direction is larger than the central part in the width direction. ing. Reference numeral 18 denotes a pair of left and right cylindrical king pin support members, which are vertically disposed in a hugging manner at both ends of the front axle 10 and are fixed by welding.
A king pin 19 is vertically inserted into the support member 18 so as to be relatively rotatable, and a front wheel 21 is rotatably provided on a hub shaft 20 fixed to the lower end of the king pin 19. Further, a steering arm 22 is fixed to the upper end of the king pin 19, and the left and right steering arms 22 are connected by a pair of left and right interlocking shafts 23 and a tie rod 25 on which a rack 24 is formed. The tie rod 25 is disposed on the front side of the front axle 10, and is covered by a cylindrical case 26 and a pair of left and right bellows 27. The cylindrical case 26 is removably fixed to a pair of left and right mounting brackets 28 fixed to the front axle 10 by bolts 29. 30 is a cylindrical cover body fixed to the cylindrical case 26, and inside this cover body 30,
A pinion (not shown) that meshes with the rack 24 is provided. Reference numeral 31 denotes an operating shaft fixed to the pinion, and is linked to a steering wheel (not shown) via a universal joint 32 and an interlocking shaft 33.The operating shaft 31 is inclined upward at the rear.
Correspondingly, a recessed portion 34 is formed in a part of the upper side of the front axle 10, and an operating shaft 31 is formed in the recessed portion 34.
is located. Reference numeral 35 denotes a cylindrical center pin receiver that opens in the longitudinal direction, and as shown in FIG. It is fixedly installed in the front axle 10 in a manner that is about half embedded, and the front axle 1
It is projected from 0 in the front-rear direction. A reinforcing member 37 is fixed to the upper surface of the front axle 10 so as to press the receiver 35 from above. Auxiliary member 37
is slightly smaller in length in the longitudinal direction than the front axle 10, and has a pair of front and rear upright portions 3 at both front and rear ends.
8 and 39, the front upright portion 38 is attached to the front wall 15 of the front axle 10, and the rear upright portion 3
9 are continuous with the rear wall 16 of the front axle 10, respectively. Therefore, the fixed portion of the reinforcing member 37 of the front axle 10 is extremely strong, and the top wall 14 of the front axle 10 does not curve downward. Reference numeral 40 denotes a pair of left and right rib portions, which are reinforced by the reinforcing member 3.
7 in the center in the front-rear direction. In addition, as shown by the imaginary line in FIG. 6, the front side of the receiver 35,
The left and right sides of the receiver 35 at the upper end of the front wall 15 of the front axle 10 may be connected by a pair of triangular reinforcing members 41. Reference numeral 42 denotes a pair of front and rear cylindrical bearing bodies having a flange on one end, which are made of hard rubber material or resin material, and are removably fitted tightly into both the front and rear ends of the receiver 35. . Reference numeral 43 denotes a center pin which is inserted into and removed from both bearing bodies 42 and the bearing body 35 so as to be relatively rotatable, and is brought into contact with the front part of the center pin so as to be slidable relative to the front bearing body 42. A ring body 44 is externally fitted and fixed. Further, as shown in FIG. 7, a front mounting bracket 45 is fixedly installed on the upper surface of the front side of the ring body 44 of the center pin 43, and the bracket 45 is attached to the lower surface of the front vehicle bearing stand 9 with bolts and nuts 4.
6, the position can be adjusted in the front-rear direction and is detachably fixed. Reference numeral 47 designates a rear mounting bracket, as shown in FIG.
The bracket 47 is mainly composed of a front wall 48 extending downward from the front vehicle bearing stand 9, and an inclined wall 49 extending rearward from the lower end of the front wall 48 in an upward slope. An insertion hole 50 is formed in the wall 48, and an opening 51 that opens rearward is also formed in the inclined wall 49, and the center pin 43 is inserted through the insertion hole 50 and the opening 51. 52
is a U-shaped bolt, which is passed through the opening 51 while holding the rear side of the center pin 43, and a nut 53 is screwed onto the bolt 52, so that the center pin 43
The rear portion is fixed to the lower surface of the front vehicle bearing stand 9 in a press-contact manner so that its position can be adjusted in the longitudinal direction and is detachable. Note that a portion of the front axle bearing stand 9 corresponding to the portion between the front and rear upright portions 38 and 39 of the reinforcing member 37 is a pair of stopper portions 54 that protrudes downward, and the stopper portions 54 are marked with the imaginary line in FIG. As shown in , the top wall 14 of the front axle 10 comes into contact with the
0's left and right swinging is regulated within a predetermined range. By the way, in the above case, the top wall 1 of the front axle 10
4 is horizontal, so when the ceiling wall 14 comes into contact with the stopper part 54, no large force is applied to the stopper part 54, and therefore the stopper part 5
4, or the stopper part 54
There is no need to form it from a special round pipe material.

Note that the front axle 10 is manufactured, for example, by a method as shown in FIG. That is, according to this method, a rectangular plate material 55 as shown in FIG. 9a is first prepared, and this is punched out using a press, so that the outer periphery of the plate material 55 is shaped into a predetermined shape as shown in FIG. 9b. In addition to the shape, an opening 5 for embedding the receiver is provided in the plate material 55.
form 6. Next, the plate material 55 is formed by a first bending process using a press as shown in FIG. 9c, and then by a second bending process as shown in FIG. 9d.
The main member 11 is formed as shown in FIG. The front axle 10 is constructed by spot welding a center side cover member 12 and a pair of left and right side side cover members 13 to the main member 11. The pair of king pin support members 18 are welded together. By employing the method for manufacturing the front axle 10 as described above, material loss can be minimized when manufacturing the main member 11.

As described in detail above, the present invention forms the top wall side of the front axle in a horizontal shape, and the bottom wall side in an upwardly curved convex shape, so that both ends of the front axle are formed in the width direction. Since the length in the vertical direction is larger than the center part, the length in the vertical direction of the fixed part between the front axle and the king pin support member is large, and the king pin support member can be firmly fixed to the front axle, and the front axle Sufficient ground clearance is secured at the center of the width direction. In addition, the front wall side of the front axle is formed into a curved protrusion shape toward the front side, and the rear wall side is formed into a curved protrusion shape toward the rear side, so that the center part of the front axle in the width direction is longer than both ends thereof. Even though the central part of the front axle in the width direction is smaller in length in the vertical direction than the ends on both sides, the strength of the front axle is large, and both ends of the front axle have king pins. Since the longitudinal length of the support member is made smaller in accordance with the size of the support member, the kingpin support member can be suitably fixed to the front axle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is a vertical sectional view of the main part, and FIG. 4 is taken along the line A-A in FIG. 1. Sectional view, 5th
The figure is a view taken along line B-B in Figure 4, Figure 6 is a perspective view of the main parts, and each figure in Figures 7 and 8 is C-C in Figure 3.
9 are explanatory diagrams showing a method of manufacturing the front axle. 1...Tractor body, 9...Front vehicle bearing stand, 10
... Front axle, 11 ... Main member, 12, 13 ... Lid member, 14 ... Top wall, 15 ... Front wall, 16 ... Rear wall, 17 ... Bottom wall, 18 ... Kingpin support member.

Claims (1)

[Scope of utility model registration request] In the front axle to which a pair of king pin support members are fixed to both ends, the top wall side of the front axle is formed horizontally, and the bottom wall side is formed upwardly in a curved protrusion shape, so that both sides of the front axle are formed horizontally. The length of the end part in the vertical direction is larger than that of the central part in the width direction, and the front wall side of the front axle is formed in a curved shape toward the front side, and the rear wall side of the front axle is formed in a curved shape toward the rear side. A front axle structure characterized in that the central part of the axle in the width direction is longer in the longitudinal direction than both sides thereof.