JPH083725Y2 - Axle case spring seat structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a spring seat structure of an axle case that is fixedly installed in an axle case of a vehicle and supports a leaf spring.

[Prior Art] As shown in FIG. 9, an upper spring seat 2a and a lower spring seat 1a are fixedly installed above and below an axle case 11a that connects wheels 19 to both side ends, and a leaf spring is installed.
The vehicle weight 21 is supported via 17. As shown in FIG. 10, the leaf spring 17 is in contact with the flat seating surface of the upper spring seat 2a at its center, and both ends thereof are supported by brackets 22 fixed to the frame 20 on the vehicle weight 21 side. Further, the lower spring seat 1a is formed with an insertion hole through which a free end portion of the U bolt 16 for tightening the leaf spring 17 penetrates and a flat nut seat surface 7a with which a nut 18 for fixing the U bolt 16 abuts. .

As described above, the lower and upper spring seats 1
The a and 2a are integrally fixed to the axle case 11a by welding. Further, it is necessary that the leaf spring 17 is stably supported, has strength enough to withstand the load of the vehicle weight 21, and has rigidity to withstand the fastening force of the U bolt 16.

11 to 13 show a conventional spring seat structure. The cross section of the axle case has various shapes such as a hollow cylindrical shape as shown in FIG. 10 and a hollow square cylindrical shape as shown in FIG.

FIG. 11 shows a lower spring seat 1b, which is a bottom plate 23 having through holes 5a through which U bolts 16 are inserted and formed at four corners.
And a reinforcing member 24 and the like which is bent and formed so as to surround the insertion hole 5a and is formed into a shape that can be fitted into the axle case 11a and welded. That is, the lower spring seat 1b is formed by press-molding the reinforcing member 24 and then pressing it to the bottom plate
It is manufactured by welding and fixing to. FIG. 12 shows an upper spring seat 2b, which is formed by bending a single plate, fitting it into the axle case 11a, and welding it.

FIG. 13 shows another conventional technique, in which the upper spring seat 2c is formed by welding a reinforcing plate 26 to a bending member 25 which is fitted into the axle case 11 and welded, and the lower spring seat 1c is Similarly, a reinforcing plate is attached to the bending member 27 that is fitted and welded in the axle case 11.
It is composed of welded 28.

Japanese Utility Model Laid-Open No. 61-163705 shows an example of a known technique of a spring seat. In the spring seat according to this publication, a flat spring seat on which a leaf spring is seated and a flat spring seat on which a nut for U-bolt fastening abuts are arranged vertically, and a space between them is connected by a spring seat support plate. The axle case 11 is inserted into a space surrounded by the spring seat and the spring seat support plates on both sides, and the contact portion with the axle case is welded and fixed. The spring seat support plate is bent and formed so as to function as a reinforcing member, and as described above, the upper and lower parts thereof are welded and fixed to the spring seat, and the welding holes punched and formed in the middle part thereof are fixed by welding to the axle case. Is formed as.

[Problems to be Solved by the Invention] In the prior art disclosed in the lower spring seats 1b and 1c and the Japanese Utility Model Laid-Open No. 61-163705 shown in FIGS. 11 and 13,
As mentioned above, the spring seat is formed from at least two parts welded together. That is, the number of constituent parts is large. Further, since these parts are manufactured by punching and bending by a press or the like, each punching die and bending die are required. Therefore, if there are many constituent parts, naturally many molds are required and the equipment cost becomes large. In addition, the spring seat needs to form a flat surface on which the leaf spring and the U-bolt are seated as described above, and it is necessary to reduce the residual welding stress generated when it is welded and fixed to the axle case as much as possible. It is necessary to form a highly precise shape. However, when there are many component parts, welding distortion occurs at the joints, and welding residual stress occurs, which may cause deformation of the shape. Therefore, a strain relief process and a stress relief process are required after welding, and further a process of inspecting the shape dimension and the welding quality of the joint is required. Therefore, there arises a problem that the manufacturing cost becomes high. Further, as shown in FIG. 8, the axle case 11 has tensile stress acting on its lower surface side,
If there is a welded portion on the lower surface side, a tensile force acts on the welded portion, stress concentration occurs, and there is a risk of weld peeling.
The above-mentioned prior art spring seats are all of the type that are welded to the lower surface of the axle case, and have the problem that tensile stress concentrates at the welds.

The present invention solves the above problems, reduces the number of components, and has necessary and sufficient rigidity,
It is an object of the present invention to provide a spring seat structure for an axle case that has a short welding length, does not cause stress concentration in the welded portion, and easily and securely holds the U-bolt assembled.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an upper spring seat and a lower spring seat, which are formed by bending a single plate and are fitted and welded to each other above and below an axle case. A spring seat structure of an axle case, comprising a U-bolt engaged with a leaf spring mounted on the upper spring seat on the lower spring seat side, wherein the upper spring seat comprises:
The seat includes a seating surface having a width dimension b in the axial direction of the axle case, and bent portions that hang down from both ends of the seating surface. The bent portion is formed with a fitting portion that is fitted and welded to the upper side of the axle case. The lower spring seat is a nut seat having a bent portion arranged to face each other with a width dimension a apart, and a through hole through which the U bolt penetrates, which is continuously provided inside a lower end of the bent portion. Surface and a bent portion for reinforcement formed by bending between the nut seat surfaces, and the bent portion for reinforcement and the bent portion of the lower spring seat have a fitting portion that fits into the lower side of the axle case. The fitting portion is welded and fixed to the axle case except the lower surface side of the axle case, and the value of (ab) / 2 is formed slightly larger than the diameter of the U bolt. The sp It constitutes a Ngushito structure.

[Operation] The lower and upper spring seats are all formed by bending a single plate to reduce the number of component parts, and there is no welding between the component parts so that welding distortion does not occur. Further, since the bent portion is fitted into the axle case and welded, the stress concentration is prevented because the welded portion is not welded to the pulling side of the axle case. Furthermore, the lower spring seat has a bending portion for reinforcement integrally formed in its middle portion,
Moreover, since it is fitted into the axle case and welded, it is formed with high rigidity. Further, since the U bolt is guided between the outer surface of the bent portion of the upper spring seat and the inner surface of the bent portion of the lower spring seat, the assembly is facilitated and the U bolt is stably supported.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the shape of the lower spring seat 1 of this embodiment. As shown in FIG. 3, the lower spring seat 1 is formed by punching a flat plate into a single plate having a width of m and bending the plate. That is, both ends of a single plate punched with a through hole 3 in the center and an opening groove 4 and an insertion hole 5 for a U-bolt at both ends are bent in a U-shape to form a bent portion 6 and a nut bearing surface 7 for a U-bolt. And form
Reinforcing bending portions 8 are formed by bending each at the central portion. The opening groove 4 and the through hole 3 form fitting portions 9 and 10 which are fitted into the axle case 11 (FIG. 4) by the above-described bending forming.

The above-mentioned bending can be press-formed with high accuracy and relatively easily by using an ordinary bending die.

FIG. 2 is a perspective view of the upper spring seat 2.
The upper spring seat 2 is formed by bending a single plate punched out to a width m substantially the same as that of the lower spring seat 1 into a U-shape, and forming a flat seating surface 12 and a bent portion 13 against which the leaf spring 17 abuts. Formed from.
The bent portion 13 has a fitting portion that fits into the axle case 11.
14 are formed. The center hole 15 formed in the center is a hole for interference prevention into which the head (not shown) of the center bolt of the leaf spring 17 is inserted.

As shown in FIG. 7, assuming that the width between the inner surfaces of the bent portions 6, 6 of the lower spring seat 1 is a and the width between the outer surfaces of the bent portions 13, 13 of the upper spring seat 2 is b, a is formed to have a size slightly larger than the size b plus twice the diameter of the U bolt 16. That is, the value of (ab) / 2 is made slightly larger than the diameter of the U bolt. Also, lower spring seat 1
The insertion hole 5 for the U-bolt 16 is positioned and drilled at a substantially central position between the inner surface of the bent portion 6 and the outer surface of the bent portion 13. Therefore, the U bolt 16 is guided while being sandwiched between the bent portions 6 and 13. The width dimension of the reinforcing bent portion 8 of the lower spring seat 1 is smaller than the width dimension b of the upper spring seat 2.

FIG. 4 shows the U-bolt in which the lower spring seat 1 and the upper spring seat 2 described with reference to FIGS. 1 and 2 are welded to the axle case 11 and the leaf spring 17 is brought into contact with the seating surface 12 of the upper spring seat 2. It shows a state in which it is tightened with 16 and a nut 18.

As shown in FIG. 4 to FIG. 6, the lower spring seat 1 has the fitting portions 9 and 10 of the bending portion 6 and the reinforcing bending portion 8.
Fit the lower part of the axle case 11,
A contact portion between 11 and both side surfaces of the fitting portions 9 and 10 is fitted and welded and fixed to the axle case 11. Therefore, other parts, particularly the lower surface of the axle case 11 on the pulling side and the fitting portion 9,
It is not welded to the 10 contact parts. In addition, similarly, the upper spring seat 2 is bent over above the axle case 11.
13 Fit the fitting part 14 of the axle case 11 and the fitting part 14
The abutting portion with and is fixed by welding.

As shown in FIG. 4, the center portion of the leaf spring 17 is seated on the seating surface 12 of the upper spring seat 2. The two U bolts 16 and 16 have their upper end bent portions abutting against the upper surface of the leaf spring 17, and as described above, the inner surfaces of the lower spring seat 1 and the upper spring seat 2 and the outer surface of the bent portion 13. The lower ends of the lower spring seat 1 are inserted into the through holes 5 of the lower spring seat 1 through the spaces between the lower spring seat 1 and the lower spring seat 1. By tightening the nut 18 screwed to the free end side of the U bolt 16, the nut 18 is pressed against the nut seat surface 7 of the lower spring seat 1, and the leaf spring 17 is fixed via the U bolt 16. Since the lower spring seat 1 is fitted with the fitting portions 9 and 10 of the bending portion 6 and the reinforcing bending portion 8 in the axle case 11 and fixed by welding, the lower spring seat 1 has sufficient rigidity against the fastening force of the nut 18 and has a shape. Deformation does not occur. Also, the eighth
As shown in the figure, tensile stress acts on the lower surface side of the axle case 11, but since the lower spring seat 1 is not welded to the lower surface of the axle case 11, it is not affected by the tensile stress. Further, since the lower spring seat 1 is welded only at the contact portions between the axle case 11 and the both side surfaces of the fitting portions 9 and 10, the welding length can be short.

In this embodiment, the reinforcing bent portion 8 of the lower spring seat 1 has the shape shown in the figure, but it may be bent into a ladder shape or the like.
It is not limited to the place. Further, although the upper spring seat 2 is not formed with a reinforcing bent portion 8, when a wide leaf spring 17 is used, the upper spring seat 2 side is also provided with a reinforcing bent portion. You may

[Effect of the Invention] According to the present invention, the following remarkable effects are obtained.

1) Since both the lower spring seat and the upper spring seat are formed only by bending one sheet, the number of constituent parts can be reduced to about half that of the conventional one.

2) It is formed by bending a single plate. Since there is no welded joint between the components and no welding strain or residual stress is generated, it is formed with relatively high precision, and post-treatment such as strain relief and stress relief is performed. It is not necessary, the manufacturing time is shortened, and the manufacturing cost is reduced.

3) Since it is formed from a relatively simple bent shape, it can be easily manufactured in a short time by using an existing bending die or the like.

4) The bending portion for reinforcement is formed to have high rigidity as a whole, and has sufficient strength to withstand the fastening force of the U bolt.

5) The U bolt is guided and held between the inner surface of the bent portion of the lower spring seat and the outer surface of the bent portion of the upper spring seat, so that the U bolt can be easily assembled and work efficiency is improved. You can do it. Further, since the bending portion for reinforcement is formed in the central portion, it does not interfere with the insertion of the U bolt.

6) Since there is no welded joint on the lower surface side where the tensile stress of the axle case occurs, problems such as stress concentration at the welded portion and weld peeling do not occur.

7) Since only the both side surfaces of the fitting portion of the lower spring seat are fitted into the axle case and fixed by welding, the welding length can be shortened as compared with the prior art and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lower spring seat of an embodiment of the present invention, FIG. 2 is a perspective view of an upper spring seat of the embodiment, and FIG. 3 is a plan view showing a shape of the lower spring seat before being folded, FIG. 4 is a front view showing a state in which the lower and upper spring seats of the embodiment are welded to the axle case and the leaf springs are fixed with U bolts.
FIG. 6 is a side view showing a welded joint state of an axle case, a lower and an upper spring seat, FIG. 6 is a top view of FIG. 5, and FIG. FIG. 8 is an explanatory front view for explaining a stress distribution acting on the axle case, and FIG. 9 is a front view for explaining a connection state between the axle case and a vehicle weight side by a commonly used spring seat, FIG. 10 is a partial side view showing the structure around a conventional spring seat, FIG. 11 is a plan view of a conventional lower spring seat, FIG. 12 is a plan view of a conventional upper spring seat, and FIG. 13 is a conventional spring. It is a side view which shows another example of a seat. 1 ... Lower spring seat, 2 ... Upper spring seat, 3 ... Through hole, 4 ... Open groove, 5 ... Insert hole,
6,13 ...... Bending part, 7 ...... Nut seat surface, 8 …… Bending part for reinforcement, 9,10,14 …… Mating part, 11 …… Axle case, 1
2 …… Seat surface, 15 …… Center hole, 16 …… U bolt, 17…
… Leaf springs, 18 …… nuts, 19… wheels, 21…
… Vehicle weight.

Claims (1)

[Scope of utility model registration request] 1. An upper spring seat and a lower spring seat, which are formed by bending a single plate and are fitted and welded to the upper and lower sides of an axle case, and engage with leaf springs mounted on the upper spring seat. A spring seat structure of an axle case in which a U bolt is fastened at the lower spring seat side, wherein the upper spring seat hangs from a seating surface having a width dimension b in the axial direction of the axle case and from both ends of the seating surface. A bending portion, and a fitting portion that is fitted and welded to the upper side of the axle case is formed in the bending portion, and the lower spring seats are arranged to face each other with a width dimension a therebetween. A bent portion, a nut seat surface continuously provided inside the lower end of the bent portion and having an insertion hole through which the U bolt penetrates, and the nut seating surface. A reinforcing bent portion that is bent between the seat surfaces, and a fitting portion that is fitted to the lower side of the axle case is formed in the reinforcing bent portion and the bent portion of the lower spring seat. The joint part is welded and fixed to the axle case except the lower surface side of the axle case, and the value of (ab) / 2 is formed to be slightly larger than the diameter of the U bolt. Spring seat structure.