JPH0717527Y2 - Spring support shaft for trunnion suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spring support shaft for a trunnion suspension of a rear biaxial truck.

(Prior Art) An example of a trunnion suspension device for suspending the rear wheels of a rear biaxial truck will be described with reference to FIG. In the figure, reference numeral 10 is a chassis frame of a truck, and the chassis frame is arranged so as to extend in the vehicle width direction and a pair of left and right side rails 12 each having a groove-shaped cross section in the left-right direction. And a cross member 16 whose both end portions are fixed to the side rail 12 via gussets 14 and whose cross-sectional shape is a groove type or an I type. Above chassis frame
A pair of left and right trunnion bases 18 are vertically installed on the lower side of the 10, and the trunnion bases 18 support the spring support shaft
Twenty are supported.

The spring support shaft 20 includes a pair of left and right spring support portions 22 that are arranged coaxially and extend in the vehicle width direction, and an arch-shaped central shaft portion that connects the ends of the spring support portions inside the vehicle body. 24, and the spring support portion 22 supports a central portion of a leaf spring device 28 composed of a plurality of leaf springs via a lower spring saddle 26, and a rear end portion of the leaf spring device 28 is supported by the leaf spring device 28. A front shaft (not shown) is mounted, and a rear rear shaft (not shown) is mounted on the rear end portion of the leaf spring device 28.

The spring support shaft 20 is conventionally manufactured by forging, and inside the spring support portion 22, there is a blind hole-shaped lightening hole 30 extending from the outside of the vehicle body toward the inside of the vehicle body to reduce weight. A lid 32 is provided at the open end of the lightening hole 30. The lid 32 has a stopper plate 34 for preventing the lower spring saddle 26 from coming out of the vehicle body.
Are fixed by bolts 36.

(Problems to be solved by the invention) The spring support shaft for the trunnion suspension described above.
20 is essentially expensive because it is manufactured by forging, and since the lightening hole 30 is open to the outside of the vehicle,
Since the lid 32 for mounting the bolt 36 for mounting the stopper plate 34 has to be fixed to the open end of the lightening hole 30, there is a problem that the structure becomes complicated and the manufacturing cost further increases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a spring support shaft for a trunnion suspension, which has a simple structure and is inexpensive to manufacture.

(Means for Solving the Problem) The spring support shaft for the trunnion suspension according to the present invention was created to achieve the above object.
The left and right spring support portions that are arranged coaxially and extend in the vehicle width direction, and the arch-shaped central shaft portion that connects the ends of the spring support portions inside the vehicle body are integrally formed by casting. It is characterized in that a blind hole-shaped casting hole is formed in each of the spring support portions and extends from the inner end of the vehicle body toward the outer side of the vehicle body.

(Operation) According to the present invention, the entire spring support shaft including the left and right coaxial spring supports and the central shaft connecting the inner ends of the spring supports is manufactured by casting. Therefore, it is essentially cheaper than a forged product. In addition, since each spring support part is provided with a blind hole-shaped casting hole extending from the inner end of the vehicle body to the outer side of the vehicle body, the casting cost can be reduced and the bottom of the blind hole can be reduced. Since the stopper plate mounting bolt can be directly screwed into the wall, the structure can be simplified.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to FIG. (Note that members or portions that are substantially the same as or corresponding to the forged spring support shaft described with reference to FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.) According to the above, the left and right spring support portions 22 that are arranged coaxially and extend in the vehicle width direction, and the spring support portions described above.
A spring support shaft 20 composed of an arch-shaped central shaft portion 24 connecting end portions of the inside of the vehicle body of 22 is cast as a whole by, for example, high-strength ductile cast iron. Each of the spring support portions 22 is formed with a blind hole-shaped casting hole 38 extending from the inner end of the vehicle body toward the outer side of the vehicle body.

Since the spring support shaft 20 having the above-mentioned configuration is manufactured by casting as a whole, the spring support shaft 20 is essentially inexpensive as compared with the conventional cast product, and the casting hole 38 for reducing the weight has a spring support portion 22 of the vehicle. Since it is formed in a blind hole shape that opens at the end portion inside the body and extends outside the vehicle body, a bolt 36 for fixing the stopper plate 34 to the bottom wall 40 of the casting hole 38 is directly screwed. Therefore, as compared with the conventional configuration in which the bolt mounting lid 32 needs to be separately made and attached to the open end,
The construction is significantly simpler and the manufacturing costs can be correspondingly reduced.

Still further, by arranging the casting hole 38 so as to extend outward from the inside of the vehicle body, a structure 42 for holding the core for forming the casting hole 38 in the mold, Compared with the case where the casting hole is formed from the outer side to the inner side of the vehicle body, it becomes much simpler, and there is an advantage that the casting cost can be effectively reduced.

(Effect of the Invention) As described above, the spring support shaft for the trunnion suspension according to the present invention includes the left and right spring support portions that are arranged coaxially and extend in the vehicle width direction, and the spring support portions of the spring support portions. An arch-shaped central shaft connecting the inner end of the vehicle body is integrally formed by casting, and extends from the inner end of the vehicle toward the outer side of the vehicle in each of the spring support portions. It is characterized by being provided with a blind hole-shaped casting hole, and it is possible to provide a spring support shaft whose manufacturing cost is significantly lower than that of the conventional one, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a front view showing a part of a spring support shaft according to the present invention in cross section, and FIG. 2 is a front view showing an overall structure of a trunnion suspension device. 10 …… chassis frame, 18 …… trunnion base, 20 ……
Spring support shaft, 22 …… Spring support part, 24 …… Central shaft part.

Claims (1)

[Scope of utility model registration request] 1. A left and right spring support portion coaxially arranged extending in the vehicle width direction, and an arch-shaped central shaft portion connecting end portions of the spring support portions inside the vehicle body, A trunnion which is integrally formed by casting and has a blind hole-shaped casting hole extending from the inner end of the vehicle body toward the outer side of the vehicle body in each of the spring support portions. Suspension spring support shaft