JP2005132249A - Axle case for vehicle and its combination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axle case for a vehicle and its combination capable of managing over a wide range with a large change of a distance from the mounting surface of a differential gear mechanism on a reinforcing ring to the center line of the installation of an axle using side plates with less sorts without making heavy the plate thickness of the reinforcing ring. <P>SOLUTION: The axle case is formed so that a projection having a channel-shaped section is provided swelling out in a central part to serve as a banjo for the accommodation of the differential gear mechanism, side plates each having the same vertical shape provided with a semi-circular or a channel-shaped section projecting part to serve as a straight pipe part where the axle is installed are put together symmetrically on the right and left of the projection and coupled together, and that the reinforcing ring and a cover are welded to the periphery of each of holes formed in front of and behind the banjo, wherein a distance from the center line of the installation of the axle to each outer end of the holes in front of and behind the side plates after assembling is made different. The combination of axle cases is configured so that a plurality of sets are provided having the same hole diameters in the axle cases and different distances from the center line of the installation of the axle to each outer end of the holes in front of and behind the side plates after assembling, and the side plates are combined in accordance with the differential gear mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sheet metal axle case (axle case, axle housing) and a combination thereof mainly used for rear axles of large and medium trucks.

  The axle case is usually made of a relatively thick steel plate, and each component is press-molded and then assembled by welding or the like. This will be explained with reference to FIG. 3. The axle case 1 bulges in the center with groove-shaped cross-section convex portions (bulges) 3 and 4 constituting the banjo portion 2 for housing the differential gear mechanism. The upper and lower steel side plates 7 and 8 having semicircular cross-section convex portions 5 and 6 constituting the straight pipe portion on which the axles (not shown) are disposed on the left and right sides of the steel plate are welded in accordance with the symmetrical shape. The reinforcing ring 10 and the cover 11 are welded around the holes 9 and 9 ′ formed before and after the banjo part 2.

  When the differential gear mechanism (not shown) is housed in the banjo part 2, it is necessary to accurately position the so-called differential pinion shaft center connected to the left and right axles on a line connecting the axle shaft centers. For this reason, it is essential to accurately obtain the distance from the axle center line of the side plates 7 and 8 to the upper surface (outer surface) of the reinforcing ring 10 on which the differential gear mechanism is set.

  By the way, normally, the distance from the axle center line of the side plates 7 and 8 of the axle case 1 to the outer ends of the holes 9 and 9 'to which the reinforcing ring 10 and the cover 11 are attached is the same. When using a differential gear mechanism in which the distance from the mounting surface of the differential gear mechanism to the reinforcing ring 10 to the shaft center of the differential pinion is different from the conventional one, it is necessary to use a reinforcing ring having a different thickness first. Consider.

  However, there are the following problems in preparing the rings 10 having different thicknesses. That is, this reinforcing ring 10 is usually a straight steel rod having substantially the same cross section bent into a circular shape with a predetermined diameter, and is cut and welded to obtain a predetermined reinforcing ring. When the thickness exceeds 20 mm, not only the equipment for bending becomes large and the amount of capital investment becomes very large, but also the thickness difference between the inner and outer circumferences after bending becomes large and the flatness deteriorates. Machining costs increase and the yield decreases drastically.

  On the other hand, in the side plates 7 and 8 of the axle case 1, the arrangement described above corresponds to the distance from the mounting surface of the differential gear mechanism to the reinforcing ring 10 to the axis of the differential pinion, that is, the center line of the axle. Although it is conceivable to prepare several things with different distances from the center line to the outer end of the hole 9 to which the ring 10 is attached, the side plates 7 and 8 are the largest parts in the axle case, The cost of the mold is also high, and increasing the types of side plates for the above purpose is far more difficult to adopt.

However, if the variation in the distance from the mounting surface of the differential gear mechanism to the reinforcing ring 10 to the center of the differential pinion, that is, the center line of the axle is small, a shim as shown in the following patent document is supplementarily provided. Although it may be used, it is also a place where a large torque is applied, and there is a problem in durability.
JP 2000-161467 A

  The problem to be solved by the present invention is that the plate thickness of the reinforcing ring is caused by a relatively large variation in the distance from the mounting surface of the differential gear mechanism to the reinforcing ring to the shaft center of the differential pinion, that is, the center line of the axle. The present invention is to provide a vehicle axle case and a combination thereof that can deal with a wide range with a small number of types of side plates without greatly increasing the number of side plates.

  In the first aspect of the present invention, a groove-shaped cross-section convex part constituting the differential gear mechanism housing banjo part is bulged in the central part, and a straight pipe part in which an axle is disposed is formed on the left and right sides of the convex part. The upper and lower side plates with a semicircular or groove-shaped cross-section convex part are joined by welding according to the symmetrical shape, and the reinforcing ring and the cover are welded around the holes formed before and after the banjo part, respectively. In the vehicle axle case, the distance from the center line of the axle to the outer ends of the front and rear holes of the assembled side plate is made different.

  According to a second aspect of the present invention, the diameter of the hole in the vehicle axle case is the same, and the distance from the center line of the axle to the outer ends of the front and rear holes of the assembled side plate is different. A combination of vehicle axle cases is provided, in which a plurality of sets are prepared and side plates are combined according to the differential gear mechanism.

  The axle case for a vehicle according to the present invention has a groove-shaped cross-sectional convex part constituting a differential gear mechanism housing banjo part bulged in the central part, and a straight pipe part in which an axle is disposed on the left and right sides of the convex part. The upper and lower side plates that form the semicircular or groove-shaped cross-section convex portions are joined by welding in conformity with the symmetrical shape, and a reinforcing ring and a cover are respectively provided around the holes formed before and after the banjo portion. The welded vehicle axle case is characterized in that the distance from the center line of the axle to the outer ends of the front and rear holes of the assembled side plate is made different. Select either the front or back (or front and back) of the side plate and combine it with the reinforcing ring even for relatively large variations in the distance from the mounting surface to the reinforcing ring to the shaft center of the differential pinion, that is, the axle center line. Respond widely by Door can be, equipment, there is an effect of suppressing to a minimum investment to the type tools.

  In addition, the vehicle axle case of the present invention has a front and back side plate that is resistant to relatively large variations in the distance from the mounting surface of the differential gear mechanism to the reinforcing ring to the shaft center of the differential pinion, that is, the center line of the axle. By selecting either of (or before and after), a considerable range of variation can be covered, so that the reinforcing ring can use the material of the optimum plate thickness for molding, and therefore, the material yield of the reinforcing ring and the processing time can be shortened. Can do.

  In the vehicle axle case combination of the present invention, the diameter of the hole in the vehicle axle case is the same, and the outer side of the front and rear holes of the side plate after assembly from the center line of the axle. A plurality of sets with different distances to the end are prepared, and the side plates are combined according to the differential gear mechanism, so that the differential gear mechanism mounting surface to the reinforcing ring from the differential gear mechanism shaft center In other words, it is possible to deal with a relatively large variation in the distance to the center line of the axle so that the investment in equipment and tooling can be further suppressed.

  In addition, the combination of the vehicle axle case of the present invention is more effective against a relatively large variation in the distance from the mounting surface of the differential gear mechanism to the reinforcing ring to the shaft center of the differential pinion, that is, the center line of the axle. Appropriate side plates can be widely selected and covered. Therefore, the thickness of the reinforcing ring can be selected more easily, and the material yield of the reinforcing ring can be further improved and the processing time can be further shortened.

  A preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3. A vehicle axle case 21 according to the present invention has a groove-shaped cross-section convex portion 23 constituting a storage banjo portion 22 of a differential gear mechanism D at a central portion. 24, and the left and right side plates 27, 28 having semicircular or groove-shaped cross-section convex portions 25, 26 constituting straight pipe portions on which the axles are disposed are formed on the left and right sides of the convex portions 23, 24, respectively. In the vehicle axle case, in which the reinforcing ring 10 and the cover 11 are welded around the holes 29 and 29 ′ formed before and after the banjo part 22, respectively, by welding in conformity with the symmetric shape. The distances from the axle center line P to the outer ends of the holes 29, 29 ′ before and after the side plates 27, 28 after assembly are made different as S and L, respectively.

  In the combination of the vehicle axle case according to the present invention, the diameters of the holes 29 and 29 ′ in the vehicle axle case 21 are the same, and the front and rear holes of the side plate after assembly are arranged from the center line P of the axle. A plurality of sets having different distances to the outer ends of 29 and 29 ′ are prepared, and side plates are combined in accordance with the differential gear mechanism D.

The embodiment shown in FIGS. 1 and 2 will be described in more detail.
The axle case 21 for a vehicle shown in FIGS. 1 and 2 has a short distance from the side surface on the side where the hole 29 is formed to the center line P of the axle to S, and the hole 29 ′ on the opposite side. The distance from the side surface on which the wheel is formed to the center line P of the axle is set long as L, and the difference between S and L is, for example, about 10 to 20 mm, although it depends on the type of vehicle. To do.

  1, in the case where the distance from the lower surface of the mounting portion 30 of the differential gear mechanism D to the center line P of the axle is short, the holes 29 before and after the side plate after assembly from the center line P of the axle are assembled. The mounting portion 30 of the differential gear mechanism D is installed through the reinforcing ring 10 on the side of the hole 29 having a short distance to the outer end of S.

  In FIG. 2, the distance from the lower surface of the mounting portion 30 ′ of the differential gear mechanism D to the axle arrangement center line P is longer than that shown in FIG. 1, after assembling from the axle arrangement center line P. A mounting portion 30 ′ of the differential gear mechanism D is installed via the reinforcing ring 10 on the side of the hole 29 ′ where the distance to the outer end of the hole 29 ′ on the front and rear sides of the side plate is long as L.

  Of course, in both the examples of FIGS. 1 and 2, the reinforcing ring 10 has a different thickness if necessary in order to accurately position the shaft center of the differential pinion in the differential gear mechanism D on the line P connecting the shaft shaft axes. Change to something. Since either the front or back (or front and back) of the side plates 27 and 28 is selected, the thickness of the reinforcing ring 10 is not greatly changed and can be easily performed.

  Combinations of the vehicle axle cases are preferably grouped together, for example, by capturing a full model change or gradually at the time of a minor model change. In this case, the difference between S and L, for example, between the front and back (or front and rear) of the side plates 27 and 28 is set to about 10 to 30 millimeters for the vehicle axle cases between equivalent vehicle types.

  1 and 2 show the side plates 27 and 28 in which the front and back (or front and rear) of the banjo portion 22 are inflated outward, but one or both of the mounting surfaces of the reinforcing ring 10 and the cover 11 are provided at both end portions of the side plates. It may be recessed inward from the cross-sectional width, and one of the surfaces may be the same as the cross-sectional width.

It is a disassembled perspective view which shows an example of the axle case for vehicles. It is principal part sectional drawing of an example of this invention axle case. It is principal part sectional drawing of another example of the axle case for this invention vehicles.

Explanation of symbols

1,21 Axle case for vehicle 2,22 Banjo part 3,4,23,24 Groove-shaped convex section (bulge)
5, 6, 25, 26 Semicircular cross-section convex portions 7, 8, 27, 28 Side plate 9, 9 ', 29, 29' Hole 10 Reinforcement ring 11 Cover 30, 30 'Differential gear mechanism mounting portion D Differential Gear mechanism S, L Distance from the center line of the axle to the outer ends of the front and rear holes of the side plate after assembly (S: short, L: long).

Claims (2)

  A groove-shaped cross-section convex part constituting the differential gear mechanism housing banjo part is bulged in the central part, and a semi-circular or groove-shaped cross-sectional convex part constituting a straight pipe part in which the axle is arranged on the left and right of the convex part. In the vehicle axle case, the upper and lower side plates having the same shape are joined by welding in conformity with the symmetric shape, and the reinforcing ring and the cover are welded around the holes formed before and after the banjo part, respectively. A vehicle axle case characterized in that the distance from the center line of the axle to the outer ends of the front and rear holes of the assembled side plate is made different. Prepare a plurality of sets in which the diameter of the hole in the axle case for the vehicle is the same, and the distance from the center line of the axle to the outer ends of the front and rear holes of the assembled side plate is different. A combination of vehicle axle cases, wherein side plates are combined according to the differential gear mechanism.

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