JP3719638B2 - Axle mounting structure for special vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axle mounting structure for a special vehicle, and in particular, an axle mounting for a special vehicle in which wear of a sliding portion is small, rusting due to water entering the sliding portion can be prevented, and only worn parts can be replaced. Concerning structure.
[0002]
[Prior art]
FIG. 5 shows a configuration diagram of a conventional axle mounting structure. The axle mounting structure 10 is disposed inside the front 1 of the speed sprayer 20, for example, as shown in FIG.
[0003]
In FIG. 5, the input shaft 3 of the differential gear box 5 is rotated by power from an engine (not shown). The power of the input shaft 3 is transmitted to the left and right wheels by the differential gear box 5. An axle center pipe 7 is fixed to the top of the differential gear box 5.
[0004]
A center piece 9 is inserted into the axle center pipe 7, and the center piece 9 protrudes from both ends of the axle center pipe 7 by a predetermined length. Pipes 11A and 11B are disposed around the protruding portion of the center piece 9. Here, the left side in FIG. 5 corresponds to the front side of the speed sprayer 20, and the right side corresponds to the rear side of the speed sprayer 20.
[0005]
Both ends of a U-shaped center cross bracket 13 are welded to the tops of the pipes 11A and 11B. Further, screw holes (not shown) are provided at both ends of the center piece 9. Bolts 15A and 15B are screwed into the screw holes via washers 17A and 17B.
[0006]
The upper part of the center cross bracket 13 is fixed to the frame of the front 1 by bolts 19A and 19B.
In such a configuration, the differential gear box 5 swings around the center piece 9 in the front direction and the back direction in FIG.
[0007]
[Problems to be solved by the invention]
By the way, in the conventional axle mounting structure 10, when the differential gear box 5 is swung, sliding surfaces are generated between the center piece 9 and the pipes 11A and 11B, and between the center piece 9 and the axle center pipe 7, and wear is generated. .
[0008]
In addition to the radial direction, wear occurs on the end surfaces between the pipes 11A and 11B and the axle center pipe 7 and between the pipes 11A and 11B and the washers 17A and 17B in the axial direction. Over time, this wear causes gaps between the end faces, and as a result, a phenomenon occurs in which the differential gear box 5 fixed to the axle center pipe 7 is largely rattled in the front-rear direction.
[0009]
When replacing such wear parts, the center piece 9 can be replaced relatively easily, but the other members are sometimes made of a welded structure, which is a large and expensive replacement operation.
Furthermore, since no countermeasure has been taken against the ingress of water or the like, rusting has occurred, causing sticking.
[0010]
The present invention has been made in view of the above-described conventional problems. The wear of the sliding part is small, the rusting due to the entry of water or the like into the sliding part can be prevented, and the wear part can be replaced only. It is an object of the present invention to provide a vehicle axle mounting structure.
[0011]
[Means for Solving the Problems]
Therefore, the present invention (Claim 1) includes an input shaft (3) rotated by power from a power source, and a differential gear box (5) connected to the input shaft (3) and transmitting the power to left and right wheels. ), An axle center pipe (7) fixed to a predetermined position of the differential gear box (5) in the longitudinal direction of the vehicle body, and inserted into the axle center pipe (7) to be connected to the front end (21a, 71a) and the rear end The shaft (21, 31, 71) with the portion (31a) protruding from the front and rear of the axle center pipe (7), the end surface of the front end (21a, 71a) of the shaft (21, 71) and / or Alternatively, the front bracket (25, 65) having a protruding portion (25a, 65a) covering the outer periphery and protruding upward, and the front bracket (25, 65) and the shaft (21) 71) The front bush (29) that is mounted between the outer ends of the front end portions (21a, 71a) and the projecting portions (25a, 65a) of the front brackets (25, 65) are fixed to the vehicle body frame (61). A front bracket fixing means (49A) and a rear bracket having a projecting portion (35a) projecting upward and covering an end face and / or outer periphery of the rear end portion (31a) of the shaft (31) (35), a rear bush (39) that is mounted between the rear bracket (35) and the outer periphery of the rear end (31a) of the shaft (31), and a projecting portion (35a) of the rear bracket (35). ) And rear bracket fixing means (49B) for fixing to the vehicle body frame (61).
[0012]
The axle center pipe (7) is fixed to a predetermined position of the differential gear box (5) in the longitudinal direction of the vehicle body. The shafts (21, 31, 71) are inserted into the axle center pipe (7), and the front end portions (21a, 71a) and the rear end portion (31a) are projected from the front and rear of the axle center pipe (7).
[0013]
The front bracket (25, 65) covers the end surface and / or outer periphery of the front end (21a, 71a) of the shaft (21, 71), and protrudes upward (25a, 65a). Have That is, the front bracket (25, 65) may be configured such that both the end surface and the outer periphery of the front end portion (21a, 71a) of the shaft (21, 71) are covered, or the end surface side is covered. You may make it cover only the outer periphery, without providing.
[0014]
The front bush (29) is provided between the outer periphery of the front bracket (25, 65) and the front end (21a, 71a) of the shaft (21, 71). The front bush (29) slides with respect to the front bracket (25, 65) and the shaft (21, 71), respectively. The front bracket fixing means (49A) fixes the projecting portions (25a, 65a) of the front bracket (25, 65) to the vehicle body frame (61).
[0015]
The rear bracket (35), the rear bush (39), and the rear bracket fixing means (49B) are configured in the same manner as the front brackets (25, 65) and the like.
As a result, unlike the conventional structure in which both ends of the center cross bracket (13) are welded, the front brackets (25, 65) and the rear bracket (35) are independent parts, so the mounting accuracy is improved. To do.
[0016]
In addition, since the welded structure is not used, it is possible to easily replace parts due to aging or wear. Furthermore, by wearing the front bush (29) and the rear bush (39), wear due to circumferential sliding caused by the swinging of the differential gear box (5) can be reduced.
[0017]
According to the present invention (Claim 2), the shaft (21, 31, 71) is divided and separated into two parts, a front shaft (21, 71) and a rear shaft (31), and the front shaft (21, 71). And an inter-shaft expansion / contraction means (27, 37, 41, 75) for expanding / contracting the separation distance between the rear shaft (31) by a screw advance / retreat operation.
[0018]
With the inter-shaft expansion / contraction means (27, 37, 41, 75), the axial mounting accuracy can be further improved.
[0019]
Further, according to the present invention (Claim 3), the diameters of the front end portions (21a, 71a) and the rear end portion (31a) of the shaft (21, 31, 71) are inserted into the axle center pipe (7). It is characterized by being formed thicker than the diameter of the shaft (21, 31, 71).
[0020]
Even if the diameter of the shaft (21, 31, 71) in the axle center pipe (7) is the same as the conventional one, the shaft (21, 31, 71) in which the bushes (29, 39) as the sliding parts are mounted. By forming the diameters of the front end portions (21a, 71a) and the rear end portion (31a) thicker, the axial pressure is further lowered and the wear becomes difficult.
[0021]
Further, according to the present invention (Claim 4), the front bush (29) and / or the rear bushing is moved to the front bracket (25) by a screwing operation from the outside of the front bracket (25) and / or the rear bracket. And / or a bush push-out means (43, 45) for pushing the rear bracket from the inside to the outside.
[0022]
Thus, by providing the bush push-out means (43, 45), the bush (29) worn during disassembly or the like can be easily detached from each bracket (25).
[0023]
Further, according to the present invention (Claim 5), between the front bracket (25, 65) and the outer periphery of the front end portion (21a, 71a) of the shaft (21, 71) and the rear bracket (35) and the shaft ( 31) O-rings (53A, 53B, 53C, 53D) are disposed between the outer periphery of the rear end portion (31a) and at both ends of the front bush (29) and / or the rear bush (39). It is characterized by that.
[0024]
By providing the O-ring (53A, 53B, 53C, 53D), it is possible to prevent rusting due to the entry of water or the like into the sliding portion.
[0025]
Further, according to the present invention (Claim 6), the axle center pipe (7) of each shaft (21, 31, 71) is provided around a predetermined position of the front shaft (21, 71) and the rear shaft (31). A movement deterrent plate (23, 33, 73) for deterring movement toward the inside is provided.
[0026]
By disposing the movement restraining plates (23, 33, 73), the front end portions (21a, 71a) and the rear end portions (31a) of the shafts (21, 31, 71) are accurately connected to the axle center pipe ( 7) Can be put out.
[0027]
For this reason, assembly work can also be performed easily. Further, the distance between the shafts (21, 31, 71) is contracted by the expansion / contraction means (27, 37, 41, 75) between the shafts, so that the movement restraining plates (23, 33, 73) are connected to the axle center pipe (7). Can be fixed to both ends. As a result, the front shafts (21, 71) and the rear shaft (31) are integrated with the axle center pipe (7).
[0028]
Further, according to the present invention (invention 7), the front bracket (65) and / or the rear bracket (35) is arranged such that the front end (71a) and / or the rear end (31a) of the shaft (31, 71). Only the outer periphery of the front bracket (65) and / or the front bracket (65) and / or the rear bracket (35) is protruded from the front bracket (65) and / or the rear bracket (35). The rear bracket (35) is provided with a removal prevention means (55) for preventing the rear bracket (35) from coming off from the shaft (31, 71).
As a result, the axle mounting structure can be further simplified.
[0029]
Further, according to the present invention (invention 8), the movement restraining plate (23, 33, 73) and the brackets (25, 35, 65) and / or the removal preventing means (55) and the brackets (25) are provided. , 35, 65), thrust washers (51A, 51B, 51C, 51D) are sandwiched.
[0030]
The axial load when the differential gear box (5) swings in the front-rear direction is received by the thrust washers (51A, 51B, 51C, 51D). The thrust washer (51A, 51B, 51C, 51D) also receives a load caused by sliding in the circumferential direction. Even when the thrust washers (51A, 51B, 51C, 51D) are worn due to this swinging or the like, the thrust washers (51A, 51B, 51C, 51D) can be easily replaced.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described. FIG. 1 shows a side view of the first embodiment of the present invention, and FIG. 2 shows a front view. Note that the same components as those in FIG. In FIG. 1, the differential gear box 5 and the axle center pipe 7 are integrally attached by a welded structure as in the conventional technique.
[0032]
A shaft 21 is inserted from the front of the axle center pipe 7, and the insertion is stopped by a movement restraining plate 23. The shaft diameter of the front end 21 a of the shaft 21 is formed to be thicker than the shaft diameter inserted into the axle center pipe 7. A bolt through hole 27 is provided at the center of the shaft 21.
[0033]
On the other hand, the shaft 31 is inserted from the rear of the axle center pipe 7, and the insertion is stopped by the movement restraining plate 33. The shaft diameter of the rear end portion 31 a of the shaft 31 is formed to be thicker than the shaft diameter inserted into the axle center pipe 7. A screw hole 37 is provided at the center of the left portion of the shaft 31. A female screw is engraved on the inner periphery of the screw hole 37.
[0034]
The long hexagon socket head cap bolt 41 passes through the bolt through hole 27 of the shaft 21 and is screwed into the screw hole 37 of the shaft 31. The head of the hexagon socket head cap bolt 41 is embedded in the shaft 21.
[0035]
The left end surface and outer periphery of the front end portion 21 a of the shaft 21 are covered with a bracket 25. A bush 29 is provided between the inner peripheral surface of the bracket 25 and the outer periphery of the front end portion 21a. A thrust washer 51A is sandwiched between the movement restraining plate 23 and the bracket 25. A washer 43 is sandwiched between the left end surface of the front end 21 a and the inner bottom surface of the bracket 25.
[0036]
As shown in FIG. 3, the tip of an extruding bolt 45 abuts on the left end of the washer 43, and the bush 29 can be removed from the inside of the bracket 25 by pushing out the washer 43. An O-ring 53 </ b> A is provided inside the bracket 25 and between the right end of the bush 29 and the movement restraining plate 23.
A protruding portion 25 a is formed on the upper portion of the bracket 25. A frame 61 of the front 1 is fixed to the upper portion of the projecting portion 25a by a bolt 49A.
[0037]
On the other hand, the outer periphery of the rear end portion 31 a of the shaft 31 is covered with a bracket 35. The rear end portion 31 a protrudes rightward from the right end of the bracket 35. A C-ring 55 is disposed around the protruding portion so that the bracket 35 cannot be removed from the rear.
[0038]
A bush 39 is provided between the inner peripheral surface of the bracket 35 and the outer periphery of the rear end portion 31a. A thrust washer 51B is sandwiched between the movement restraining plate 33 and the bracket 35. Further, a thrust washer 51C is sandwiched between the bracket 35 and the C ring 55.
[0039]
O-rings 53B and 53C are provided inside the bracket 35 and between the left end of the bush 39 and the movement restraining plate 33 and between the right end of the bush 39 and the thrust washer 51C. A protruding portion 35 a is formed on the upper portion of the bracket 35. A frame 61 of the front 1 is fixed to the upper portion of the projecting portion 35a by a bolt 49B.
[0040]
Next, the operation of the first embodiment of the present invention will be described.
The shaft 21 and the shaft 31 are fixed to the axle center pipe 7 as an integral structure by screwing the long hexagon socket head bolt 41 into the screw hole 37 of the shaft 31.
[0041]
As the differential gear box 5 swings, the bush 29 slides on the outer peripheral surface of the shaft 21 a and the inner peripheral surface of the bracket 25. The bush 39 slides on the outer peripheral surface of the shaft 31 a and the inner peripheral surface of the bracket 35. That is, the load on the sliding surface is received by bushes 29 and 39 as bearings.
[0042]
As a result, friction in the circumferential direction can be reduced as much as possible. Since the shaft diameters of the shaft 21a and the shaft 31a are large, the axial surface pressure can be lowered, and it can be made more difficult to wear. Even when the bush 29 is worn, the bush 29 can be easily removed by the pushing bolt 45.
[0043]
When the projecting portions 25a and 35a are attached to the frame 61, since the brackets 25 and 35 are separate, the brackets 25 and 35 can be attached to the frame 61 without back and forth backlash. For this reason, the mounting accuracy is improved.
[0044]
The load in the front-rear direction is received by thrust washers 51A, 51B, 51C. When the thrust washers 51A, 51B, 51C are worn, they can be easily replaced.
Furthermore, by providing the O-rings 53A, 53B, and 53C, it is possible to prevent rust due to the outflow of grease and the entry of water or the like into the sliding portion.
[0045]
As described above, wear parts (maintenance parts) can be specified, and all these parts are structurally simple, and the replacement cost is reduced.
In addition, since the dimensions of the mounting portion are the same as those of the conventional axle mounting structure, it can be replaced with the axle mounting structure of the present embodiment without any change.
[0046]
Next, a second embodiment of the present invention will be described. FIG. 4 shows a side view of the second embodiment of the present invention. The same elements as those in FIGS. 1 and 5 are denoted by the same reference numerals and description thereof is omitted. The second embodiment of the present invention is different in that a bracket 65 is provided instead of the bracket 25 of the first embodiment.
[0047]
The outer periphery of the bracket 65 is configured similarly to the outer periphery of the bracket 35. That is, in addition to the thrust washer 51A, a thrust washer 51D is disposed on the left side of the front end portion 71a of the shaft 71 and is prevented from being removed by the C ring 55. An O-ring 53D is provided inside the bracket 65 and between the left end of the bush 29 and the thrust washer 51D.
[0048]
Further, a movement restraining plate 73 is disposed at a predetermined position on the outer periphery of the shaft 71. A long bolt 75 is passed through the shaft 71. The head of the bolt 75 protrudes outside the front end 71 a of the shaft 71.
[0049]
However, it may be embedded in the front end 71a. A protruding portion 65 a is formed on the upper portion of the bracket 65. A frame 61 of the front 1 is fixed to the upper portion of the projecting portion 65a by a bolt 49A.
[0050]
With this configuration, the axle mounting structure can be configured without requiring a sbase as forward as in the first embodiment of the present invention.
Even if comprised as mentioned above, the effect similar to 1st Embodiment of this invention can be acquired.
[0051]
【The invention's effect】
As described above, according to the present invention, since the front brackets (25, 65) and the rear bracket (35) are formed of independent parts, the mounting accuracy is improved. In addition, since the welded structure is not used, it is possible to easily replace parts due to aging or wear.
[0052]
Further, since the front bush (29) and the rear bush (39) are mounted, the load on the sliding surface accompanying the swinging of the differential gear box (5) is applied to each bush (29, 39). Wear can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a first embodiment of the present invention. FIG. 2 is a front view of the first embodiment of the present invention. FIG. 3 is a view for explaining a method of removing a bush from the bracket. Side view of second embodiment [FIG. 5] Configuration diagram of conventional axle mounting structure [FIG. 6] Arrangement example of axle mounting structure [Explanation of symbols]
3 Input shaft 5 Differential gear box 7 Axle center pipe 21, 31, 71 Shaft 21a, 71a Shaft front end 23, 33, 73 Movement restraining plate 25, 35, 65 Bracket 25a, 35a, 65a Projecting portion 27 Bolt through hole 29, 39 Bush 31a Shaft rear end 37 Screw hole 41 Hexagon socket head bolt 43 Washer 45 Extrusion bolt 49A, 49B Bolt 51A, 51B, 51C, 51D Thrust washer 53A, 53B, 53C, 53D O-ring 61 Frame 75 Bolt

Claims (7)

An input shaft (3) rotated by power from a power source, a differential gear box (5) connected to the input shaft (3) and transmitting the power to left and right wheels, and a predetermined number of the differential gear box (5) An axle center pipe (7) fixed to the vehicle body in the longitudinal direction of the vehicle body, and inserted into the axle center pipe (7). The front end portions (21a, 71a) and the rear end portion (31a) are respectively connected to the axle center pipe (7 ) And the end surfaces and / or outer circumferences of the front end portions (21a, 71a) of the shafts (21, 71), and projecting upward. Front brackets (25, 65) having protruding projecting portions (25a, 65a), and front end portions (21a, 7) of the front brackets (25, 65) and the shafts (21, 71). a) A front bushing (29) that is mounted between the outer peripheries, and a front bracket fixing means (49A) for fixing the protruding portions (25a, 65a) of the front brackets (25, 65) to the vehicle body frame (61). A rear bracket (35) covering the end surface and / or outer periphery of the rear end portion (31a) of the shaft (31) and having a projecting portion (35a) protruding upward; and the rear bracket ( 35) and a rear bushing (39) that is mounted between the outer periphery of the rear end portion (31a) of the shaft (31) and a projecting portion (35a) of the rear bracket (35) on the vehicle body frame (61). and a rear bracket fixing means (49B) for securing the shaft (21,31,71) is divided spaced two front shafts (21, 71) and a rear shaft (31), said front shaft 21 and 71) and axle attachment structure of the special vehicle, characterized in that the shaft between the scaling means for scaling the distance the screw advancing and retracting operations between the rear shaft (31) (27,37,41,75) is provided. The diameters of the front end portions (21a, 71a) and the rear end portion (31a) of the shaft (21, 31, 71) are the same as those of the shaft (21, 31, 71) inserted into the axle center pipe (7). 2. The axle mounting structure for a special vehicle according to claim 1, wherein the structure is thicker than the diameter. The front bush (29) and / or the rear bushing is pushed out from the front bracket (25) and / or the rear bracket inside by a screwing operation from the outside of the front bracket (25) and / or the rear bracket. The axle mounting structure for a special vehicle according to claim 1 or 2 , further comprising bush pushing means (43, 45). Between the front bracket (25, 65) and the outer periphery of the front end (21a, 71a) of the shaft (21, 71) and between the rear bracket (35) and the outer periphery of the rear end (31a) of the shaft (31). claim during at, and wherein said front bushings (29) and / or the O-ring at both ends of the rear bush (39) (53A, 53B, 53C, 53D) are disposed 1,2 Or the axle mounting structure of the special vehicle of 3 description . Around the predetermined positions of the front shaft (21, 71) and the rear shaft (31), a movement deterrent plate that inhibits the movement of the shaft (21, 31, 71) toward the inside of the axle center pipe (7). 5. The special vehicle axle mounting structure according to claim 1, wherein (23, 33, 73) are respectively disposed. The front bracket (65) and / or the rear bracket (35) covers only the outer periphery of the front end (71a) and / or the rear end (31a) of the shaft (31, 71), and the shaft The shaft (31, 71) of the front bracket (65) and / or the rear bracket (35) has a predetermined circumference protruding from the front bracket (65) and / or the rear bracket (35) of (31, 71). 71. The axle mounting structure for a special vehicle according to claim 1, further comprising a disconnection preventing means (55) for preventing the disconnection from 71). A thrust washer (25, 35, 65) between the movement restraining plate (23, 33, 73) and the brackets (25, 35, 65) and / or between the removal preventing means (55) and the brackets (25, 35, 65) The axle mounting structure for a special vehicle according to claim 6 , wherein 51A, 51B, 51C, 51D) are sandwiched.

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