JPH0633048B2 - Trailer coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is used in the field of connecting trailers,
In particular, it relates to the support of the coupler base.

(B) Prior Art As shown in FIG. 3 of Japanese Utility Model Laid-Open No. 57-103282, a conventional trailer coupling device is provided with a cylindrical protrusion on a support bracket, and an elastic member is provided in the protrusion. A shaft supported at substantially the center is provided, and the coupler base is supported by this shaft.

(C) Problem to be Solved by the Invention By the way, when the trailer side is connected to the connecting device, the coupler base pushes down the shaft, so that the coupler base comes into contact with the projecting portion of the support bracket and the elastic member and the projecting portion. Will be supported. Therefore, when the tractor travels on rough terrain, the coupler base oscillates back and forth, that is, pitches.However, when the coupler base pitches, the inner surface of the coupler base and the abutting surface of the protrusions are worn by sliding and are There is a problem that the wall thickness becomes thin and the strength of the coupler base and the support bracket decreases.To solve this problem, if you replace both before reducing the strength, you can replace the entire part with only some wear. It has to be uneconomical.

When the tractor makes a sharp turn, the coupler base swings to the left or right, that is, it rolls.However, when the coupler base rolls, one side of the coupler base floats above the protrusion, and the other side has a point at the end of the protrusion. It has a drawback that it is supported and a concentrated stress is generated at the end to damage it.

The present invention has been made to solve the above problems,
The purpose is to reduce the wear of the coupler base and the support bracket even if the coupler base is pitched, and prevent the concentrated stress from being generated at the end by preventing the support from becoming a single point even when rolling. Is provided.

(D) Means for Solving the Problems The present invention achieves the above-mentioned object, and in a coupler base,
In a trailer connecting device in which a jaw that engages a trailer-side kingpin and an operation lever that controls the jaw are provided, and the coupler base is supported by a pair of left and right support brackets, between the coupler base and the support bracket. The present invention relates to a trailer connecting device in which a detachable cone is interposed, contact portions of the support bracket and the cone are made spherical, and a through hole is provided in a part of a coupler base facing the cone.

(E) Action When the coupler base is pitched, the support bracket slides between the cone and the cone so that the coupler base and the support bracket do not come into contact with each other and wear, and the rolling of the coupler base causes the coupler base to swing left and right. However, since the support bracket and the cone are in contact with each other in a spherical shape, the load is not always received by the whole support bracket and the stress is dispersed.

When replacing the cone, push the rod into the through hole to remove the cone from the coupler base.

(F) Embodiment An embodiment will be described below with reference to the drawings. (1) (1) is a pair of left and right support brackets bolted to a tractor (not shown).

On the support brackets (1) (1) are cones (2) (2) described later.
The coupler base (3) is supported via. The coupler base (3) rotatably supports a pair of jaws (4) and (4) which engage with a king pin (not shown) on the trailer side, and the jaws (4) and (4) are lock plungers. It is designed to be locked at (5). Further, the lock plunger (5) can be locked or unlocked by an operating lever (6) protruding from the coupler base (3), and further the operating lever (6) is a lock plunger (5). Safety device
It is also possible to release (7). That is, by operating the operation lever (6) in the direction of the arrow in FIG. 1, the safety device (7) is disengaged in the first stage and the lock plunger is released in the second stage.
(5) is designed to come off.

Next, the connection between the support bracket and the coupler base will be described with reference to FIGS. 2 to 4. A convex spherical surface part (8) is formed on the upper part of the support bracket (1), and a horizontal direction is formed in the middle. A penetrating through hole (9) is provided, and a vertically extending projection (10) is provided in an upper part of the through hole (9) in the front-rear direction.

A bowl-shaped cone (2) made of synthetic resin is provided above the support bracket (1).

The entire inner surface of the cone (2) is the support bracket (1).
Form a concave spherical part (11) that matches the convex spherical part (8) of
A bee-wound oil groove (12) is formed in the middle of the concave spherical portion (11).

As shown in FIG. 5, the outer surface of the cone (2) has a flat part (13) in the center, a conical part (14) in the middle, and a cylindrical part (15) in the outer periphery,
Each is formed continuously. There are recesses (16) and (16) in the left and right two places of the conical portion (14), and oil grooves in the front and rear two places.
Flow paths (17) and (17) communicating with (12) are formed, respectively.

In addition, two semi-circular cutouts (1
8) and (18), and semi-conical projections (19) and (19) are formed respectively at two front and rear positions.

The recesses (16) (16) and the protrusions (19) (19) serve as a rotation stop and also as a position alignment at the time of attachment to the coupler base (3).

A recess (20) for accommodating the cone (2) is formed on the inner surface of the coupler base (3), and the recess (20) has a flat portion (13) on the outer surface of the cone (2) and a conical portion (14). The flat part (21), the conical part (22) and the cylindrical part (23) which respectively match the cylindrical part (15) are formed.

Further, the conical portion (22) is provided with protrusions (24) and (24) that match the recessed portions (16) and (16) of the cone (2), and the cylindrical portion (23) is protruded from the cone (2). Semi-conical groove (25) that matches part (19) (19)
(25) is formed.

Further, in the flat portion (13), there is a recess (2) above the coupler base (3).
(0) is provided with a through hole (26) communicating with the through hole (26)
The cone (2) fitted in the recess (20) can be pushed out to remove it by pushing the rod into.

Further, since the through hole (26) also communicates with the oil groove (12) through the flow paths (17) (17) of the cone (2), it serves as an inlet for oil and fat into the oil groove (12). It is something that can be supported.

(27) is a retaining rod for connecting the support bracket (1) and the coupler base (3) with a cone (2) interposed, and a recess (2
Insert the elastic member (30) such as rubber having the groove (29) and the notch groove (29) into the through hole (9) of the support bracket (1) and the recess (28).
Align with the projection (10), and then hold the stop rod (27) in the notch (2
The through hole (9) is penetrated along the hole (9).

Screw the bolts (32) and (32) passed from above into the bolt holes (31) and (31) of the coupler base (3) into the screw holes (31) and (31) provided at both ends of the retaining rod (27). The support bracket (1) and the coupler base (3) are joined together by tightening.

In the embodiment, the outer surface of the cone is formed of a flat portion, a conical portion and a cylindrical portion to prevent the cone from sliding back and forth and left and right with respect to the coupler base during pitching and rolling of the coupler base. It is supposed to do
It is also possible to prevent sliding by an arbitrary projection or depression, and the outer surface of the cone is not limited to the structure of the embodiment but may be spherical or the like.

If the cone is a non-greasing member made of epoxy resin or the like, greasing work can be omitted.

The operation of the present invention will be described below with the above-mentioned structure. First, the engagement / disengagement with the tray is performed by operating the operation lever (6) in the direction of the arrow in FIG. The trailer can be removed by unlocking and advancing the tractor, and when the tractor is moved backwards with the jaws (4) (4) open, the jaws (4) (4) pinch the trailer kingpin, The safety device (7) and the lock plunger (5) are automatically locked and the trailer can be pulled.

When the tractor travels by pulling the trailer, the load of the trailer acts on the coupler base (3) and pitching occurs when traveling on an uneven terrain and rolling occurs when traveling.

In the case of pitching, the support bracket (1) and the cone (2) slide between the spherical surfaces (8) and (11), but the cone (2) is made of synthetic resin or the like, so the support bracket (1) There is almost no wear, and the coupler base (3) does not wear at all because it is not in direct contact with the support bracket (1).

Although the cone (2) itself may be worn, in that case, the cone (2) may be replaced, and the cost can be reduced.

In the case of rolling, the coupler base (3) swings to the left and right, and one end is supported by bolts (32) (32), retaining rod (27) and elastic member (30) that try to float up. Bracket (1)
Since the other end is supported by the other support bracket (1) and is supported by the entire spherical surface portion (8), the stress is dispersed.

Next, when replacing the cone or the like, the bolts (32) are removed from above the coupler base (3) and the coupler base (3) is removed from the support bracket (1).

Since the cone (2) is fitted in the coupler base (3), the rod is pushed through the through hole (26) of the coupler base (3) and the cone (2) is pushed out.

In addition, the oil and fat can be injected into the oil groove (12) of the cone (2) by injecting it through the through hole (26) of the coupler base (3) so that
3), reaches the oil groove (12) through the flow path (17).

(G) Effect of the Invention As described above, according to the present invention, since the cone is interposed between the support bracket and the coupler base, and the contact portions of the support bracket and the cone are spherical, the support bracket and the coupler base are in direct contact with each other. It is possible to significantly reduce the wear of both.

Further, during rolling, since the entire spherical surface of the support bracket is always supported, stress can be dispersed and damage to the support bracket and the coupler base can be prevented.

Further, since the through hole is provided in a part of the coupler base facing the cone, the detachment from the coupler base becomes very easy.

[Brief description of drawings]

1 is an overall view, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, FIG. 4 is an assembled view, and FIG. 5 is a perspective view of a cone. . (1) is a support bracket, (2) is a cone, (3) is a coupler base, (8) is a convex spherical surface portion, (11) is a concave spherical surface portion, and (26) is a through hole.

Claims (1)

[Claims] 1. A trailer connecting device comprising a coupler base having a jaw engaging a kingpin on a trailer side and an operating lever for controlling the jaw, and the coupler base being supported by a pair of left and right support brackets. A detachable cone is interposed between the coupler base and the support bracket, contact portions of the support bracket and the cone are made spherical, and a through hole is provided in a part of the coupler base facing the cone. Trailer connecting device.