JPH0315431Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a tractor-trailer coupling device,
That is, the present invention relates to a buffer support structure for elastically supporting a top plate on a support bracket in a coupler called the fifth wheel.

(Prior Art) When a tractor is driven with a trailer connected to it by a coupler, displacement acts mainly in the longitudinal direction, which coincides with the traveling direction, and in the vertical direction between the support bracket and the top plate. Therefore, the support structure for the support bracket and the top plate has heretofore been an elastic support structure to allow the above-mentioned displacement. For example, as disclosed in Japanese Utility Model Application No. 57-103284, an elastic member having a concave seat surface is attached to the bottom surface of the top plate, and the upper protrusion of the support bracket is fitted into this concave seat surface. The support bracket has a structure in which a corresponding arc-shaped holder clamp is fixed to the top plate so as to wrap around the downward arcuate protrusion opposite to the upper protrusion. This structure effectively absorbs downward and rotational displacements of the top plate relative to the support bracket.

(Problems to be Solved by the Invention) Previously known coupler support structures are designed to effectively absorb the downward and rotational displacements of the top plate relative to the support bracket, as exemplified above. Sufficient consideration is not given to the direction in which the plate moves away from the support bracket, that is, the direction in which the kingpin is pulled out, and the displacement in the traveling direction of the tractor, that is, in the longitudinal direction. For example, due to these displacements in the vertical and longitudinal directions, the support bracket and the holder clamp collide, and since these two members are metal, these collisions become metal-to-metal collisions, and the impact is transmitted to the driver's seat. This not only adversely affects the driver's ride comfort, but also causes early damage to the support bracket and holder clamp, which has an impact on safety.

In view of the above-mentioned problems with the conventional support structure, this design absorbs the impact caused by displacement of the top plate relative to the support bracket in the vertical direction as well as in the front-rear direction, improves the ride comfort for the driver, and provides elasticity that absorbs the impact. The purpose of the present invention is to provide a novel shock absorbing support structure for a coupler, which reduces fatigue of members and makes it possible to maintain high safety over time.

(Means for solving the problem) For this purpose, in this invention, a first elastic member having a downward concave portion is attached to the bottom surface of the top plate,
A shock absorbing support structure for a coupler in which a holder top having an outer surface shape corresponding to the recess of the first elastic member is fitted into the first elastic member so that the top plate is elastically supported by a support bracket, A substantially cylindrical holder is pivotally supported on the support bracket, and a holder clamp bent downward into a semicircular shape so as to correspond to the cylindrical holder is fixed to the top plate. It is characterized in that a second elastic member formed in a semicircular shape is also interposed in between.

(Function) In this invention, the first
The first elastic member is constructed by fitting a holder top having an outer surface shape corresponding to the recess into a downward recess of the elastic member, and absorbs vertical downward displacement of the top plate relative to the support bracket. Next, a semicircular second elastic member interposed between the holder clamp and the holder absorbs the impact caused by vertical upward displacement of the top plate with respect to the support bracket, and also absorbs the impact caused by longitudinal displacement, Eliminates the impact caused by collisions between metal parts.

Due to the above-mentioned action, the corresponding elastic member is different depending on the direction of the impact, so each elastic member is significantly less likely to be fatigued by the impact than when only one elastic member is used in the past. Become.

(Example) The details of the present invention will be explained below with reference to preferred embodiments shown in the drawings.

In the figure, reference numeral 1 designates the top plate of the coupler, which has a downwardly open recess 3 formed by a downward rib 2, which is also formed in a known top plate, and a first recess 3 having a similar downward recess 5 in the recess 3. An elastic member 4 is fitted and mounted. In the illustrated embodiment,
Although the first elastic member 4 is shaped like an upside-down rectangular parallelepiped lunch box, its shape does not necessarily have to be a rectangular parallelepiped.

In the figure, reference numeral 6 denotes a support bracket, and a bracket pin 9 is installed and fixed between the bearing portions 8, 8 of the pair of rising pieces 7, 7. In the figure, reference numeral 10 denotes a holder having a substantially cylindrical shape, and this holder 10 is integrally formed with a holder top 11 having an outer surface shape corresponding to the downward recess 4 of the first elastic member 4.
The holder 10 is pivotally supported on the bracket pin 9 via the bush 12, and the holder top 11 of the holder 10 is supported by the first elastic member 4.
The top plate 1 is elastically supported by the support bracket 6.

The holder top 11 is connected to the holder by its central upright portion 13 and is generally connected to a first elastic member 4 as shown in FIGS. 1 and 3.
It has a concave shape with an open bottom, and has a reinforcing rib 15 between the central rising portion 13 and the surrounding vertical wall 14.

Further, reference numeral 16 in the figure denotes a holder clamp made by bending a metal plate, that is, its central part 17 is bent downward into a semicircular shape to correspond to the cylindrical holder 10, and bolts 18 are attached to the downward rib 2 of the top plate 1. This prevents the top plate 1 from floating up and coming off.

19 in the figure is a second elastic member, which is formed into a substantially semicircular shape as shown in FIGS. 1 and 3;
This is interposed between the holder clamp 16 and the holder 10. At both ends forming the open edge of this second elastic member 19, there are notches 2 on both sides.
Positioning protrusions 21 and 2 formed by 0 and 20
1. That is, when this second elastic member 19 is fitted into the holder 10 from below, the notches 20, 20 are positioned at the reinforcing ribs 15, 15 of the holder top 11, and the positioning projections 2
1 and 21 are positioned on the reinforcing ribs 15 and 15.

With the buffer support structure of the present invention having such a configuration, there is a downward recess 3 on the bottom surface of the top plate 1.
The holder top 1 of the holder 10 attached to the support bracket 6 is attached to the first elastic member 4 having a
1 was fitted, the first elastic member 4
The top plate 1 and the holder top 11 support the downward load applied to the top plate 1 from above.
It absorbs the shock caused by the positional displacement that occurs between the And in the case of couplers, when running,
A force is applied between the top plate 1 and the support bracket 6 in an upward direction, that is, in a direction to remove the kingpin (not shown), and a force is applied between the top plate 1 and the support bracket 6 in the running direction, that is, in the front and rear direction. However, in this invention,
A second elastic member interposed between the holder 10 and the holder clamp 16 supports the load caused by each displacement and absorbs the impact caused by this. Therefore, both the first and second elastic members 4 and 19 support loads based on displacements in either the vertical or longitudinal direction, and absorb and alleviate any impact.

(Effects of the invention) As described above, according to the buffer support structure of the coupler of the present invention, as a structure for supporting the top plate on the support bracket, the first elastic member is placed between the holder top of the holder attached to the support bracket. Since the second elastic member having a semicircular shape is interposed between the holder clamp and the holder, it can not only withstand the downward load applied to the top plate, but also the upward and frontal loads of the top plate. We were able to create a supporting structure that provides support, absorbs and alleviates the impact caused by these movements, eliminates the impact that occurs when metal objects collide with each other, reduces the impact transmitted to the driver's seat, and provides a comfortable ride. Furthermore, a holder top was provided at the top of the holder, this was pivotally supported by the support bracket, and a holder clamp bent downward into a semicircular shape in the center to correspond with the cylindrical holder was fixed to the top plate. The plate can rotate smoothly using the pin,
This has the effect of making it easier to connect the king pin.
Furthermore, since metals do not collide with each other, damage to the holder and holder clamp can be reduced, resulting in a support structure that is highly safe over time.

[Brief explanation of drawings]

The drawings show preferred embodiments of the invention.
Fig. 1 is an enlarged sectional view of the main part, Fig. 2 is a front view cut along the bracket pin section, Fig. 3 is an exploded perspective view of the main part, and Fig. 4 is the bottom view of the coupler having the support structure of the present invention. The figure shows the coupler with one support bracket removed, and FIG. 5 is a partially cutaway side view of the coupler. DESCRIPTION OF SYMBOLS 1... Top plate, 4... First elastic member, 5... Downward recess, 6... Support bracket, 10... Holder, 11... Holder top, 16... Holder clamp, 19... Second Elastic member.

Claims (1)

[Scope of utility model registration request] A first elastic member having a downward recess is attached to the lower surface of the top plate, and a holder top having an outer surface shape corresponding to the recess of the first elastic member is fitted onto the first elastic member to close the top plate. A buffer support structure for a coupler that is elastically supported by a support bracket, in which a substantially cylindrical holder is pivotally supported on the support bracket, the holder top is provided on the upper part of the holder, and the cylindrical holder is provided in the center. A holder clamp bent downward into a semicircular shape corresponding to the holder is fixed to the top plate, and a second elastic member formed into a semicircular shape is interposed between the holder clamp and the holder. Features a buffer support structure in the coupler.