JPH07125657A - Tilt mechanism of cab suspension - Google Patents

Abstract

PURPOSE:To improve durability by fitting a pin in a slot free to move, forming the lower surface of a connecting member in a spherical surface, constituting a device so that it can make contact with a spherical part formed on the upper surface of a chassis frame and preventing application of excessive force on the device. CONSTITUTION:A pin 8 is projectively provided on both end parts of a connecting member 6 and is fit in a slot 7. The lower surface of the connecting member 6 is formed in a spherical surface 6a and ca make contact with a spherical part 2a formed on the upper surface of a chassis 2. When a main sill 1 and a connecting arm 3 are revolved in the arrow Z direction with the connecting arm 3, a bracket on the side of the chassis 2 and a connecting pin 11 as their fulcrums at the time when a cab tilts, the connecting member 6 is lifted up through a spring 7 and the spherical parts 6a and 2a are separated from each other. The connecting member 6 is guided to the slot 7 through a pin fixed on it and lifted up, positions of the spring 7 and the connecting member 6 are stabilized and the spherical part 6a on the lower surface is not swung sideways.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt mechanism for tilting a cab with respect to a chassis frame in a cab over vehicle such as a cab over truck.

[0002]

2. Description of the Related Art In cab-over trucks,
A connecting arm is interposed between the main sill of the cab and the chassis frame, and the cab is tilted by rotating the cab main sill around a fulcrum on the side of the connecting arm.

As an example of the tilt mechanism of the cab over track, Japanese Utility Model Publication No. 2-74287 (Japanese Utility Model Application No. 63-
No. 155101) is provided.

According to the present invention, two brackets are fixedly mounted on the chassis frame, one bracket pivotally supports the lower end of the chassis side stopper, and the other bracket pivotally supports one end of the cab suspension arm.
The lower end of the cab-side stopper protruding from the lower surface of the main sill of the cab is connected by fitting a pin into the elongated hole of the chassis-side stopper, and the cab suspension arm is attached to the tilting central axis of the intermediate portion of the cab-side stopper. The other end is connected to form a tilt mechanism.

When the cab main sill is tilted, the main sill is rotated around the tilting central axis to move the connecting pin downward in the elongated hole of the chassis side stopper through the cab side stopper. On the other hand, a chassis-side stopper is set up and brought into contact with the engaging portion of the one bracket.

[0006]

In the cab suspension system shown in Japanese Utility Model Laid-Open No. 2-74287 as described above, two brackets on the chassis frame side and a cab main are used as the tilt mechanism of the cab main sill. Stopper with two support pin parts on the sill side,
Further, a large number of members such as a stopper on the chassis frame side and a cab suspension arm are required as elements for connecting the two, which complicates the mechanism and increases the number of parts.

Further, by combining the links and the pins, one surface of the link (lower chassis side stopper) is brought into contact with the locking surface of the bracket at the time of tilting, and the balance of the link coupling between the chassis side stopper and the cab suspension arm during normal running. Therefore, the cab main sill is held at the running position.Therefore, when the dimensional accuracy between the constituent members is rough and there is some error, there is no part that absorbs the error in this dimension, which makes the device unreasonable. The force may act and cause damage.

Therefore, an object of the present invention is to construct a tilt mechanism with a simple structure and with a small number of parts, and to absorb even a slight error in the dimensional accuracy of the constituent members, and to force the device unreasonably. Is added to improve durability.

[0009]

According to the present invention, a long hole is provided in the vicinity of a central portion of a connecting arm for connecting a bracket provided on a lower portion of a main sill and a bracket provided on an upper portion of a chassis frame by pin connection. A spring is installed between a connecting member having a pin fixed to a side portion and a lower portion of the main sill, the pin is movably fitted in the elongated hole, and the lower surface of the connecting member is formed into a spherical surface. Then, the above-mentioned problem is solved by being configured so as to contact the spherical surface portion formed on the upper surface of the chassis frame.

[0010]

When the cab of the vehicle is tilted, when the main sill is pivoted upward with the connecting pin between the connecting arm and the chassis side bracket as a fulcrum, the connecting member and pin are guided upward in the slot through the spring. Easy to lift.

During normal running of the vehicle, if the connecting arm is rotated in the opposite direction to return the main sill to the horizontal state, the connecting member and the pin are also lowered downward via the spring, and the connecting member is placed on the spherical surface above the chassis frame. It sits smoothly and can be cushioned by a spring between the main sill and the chassis frame.

Therefore, even if there are some dimensional errors or assembly errors in the constituent members, the fitting portion between the elongated hole and the pin, the spring,
Also, since these errors are absorbed by the spherical contact portion between the connecting member and the chassis frame, an unreasonable force is not applied to the entire apparatus. Therefore, it is possible to maintain sufficient durability and reliability.

[0013]

Embodiments of the present invention will be described in detail below with reference to FIGS. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but merely illustrative examples. Nothing more.

In the drawing, 1 is a main sill of a cab, 4
Is a cab side bracket fixed to the lower surface of the main sill 1, 2 is a chassis frame, 5 is the chassis frame 2
It is a chassis side bracket fixed to the upper surface of the. A connecting arm 3 is connected between the brackets 4 and 5 via bins 10 and 11.

Reference numeral 6 is a connecting member, and 7 is a spring (tension spring) provided between the lower surface of the main sill 1 and the upper surface of the connecting member 6. The center portion of the connecting arm 3 is a forked portion 3a protruding downward, and the forked portion 3a is provided with a long hole 7 smoothly curved in an arc shape.

Pins 8, 8 are provided on both sides of the connecting member 6 so as to project into the elongated hole 7. Further, the lower surface of the connecting member 6 is formed into a spherical surface 6a, and the chassis 2
It is abuttable on the spherical surface portion 2a formed on the upper surface of the.

In the cab-over type vehicle constructed as described above, when the cab is tilted, the main sill 1 and the connecting arm 3 are connected to the connecting pin 1 between the connecting arm 3 and the chassis side bracket as shown in FIG.
When rotating like 1 arrow with Z as the fulcrum, spring 7
The connecting member 6 is lifted through the spherical parts 6a, 2a.
Leave. In this case, the connecting member 6 is guided by the elongated holes 7 via the pins 8 and 8 fixed to the connecting member 6 and is lifted, the positions of the spring 7 and the connecting member 6 are stabilized, and the spherical surface portion 6a of the lower surface is left and right. I will not be shaken by.

During normal traveling of the vehicle, the main sill 1 and the connecting arm 3 are rotated about the pin 11 as a fulcrum in the direction opposite to the arrow Z in FIG. As a result, the connecting member 6 moves downward via the spring 7, the spherical surface portion 6a of the connecting member 6 contacts the spherical surface portion 2a of the chassis, and the main sill 1 becomes horizontal as shown in FIG.

In this case, the connecting member 6 has pins 8,
Since it descends while being guided by the elongated hole 7 via 8, the spherical surface portion 6a of the connecting member 6 and the spherical surface portion 2a of the chassis 2 are reliably engaged. Therefore, even if there is a slight dimensional error in each component or an error in assembly, the elongated hole 7 absorbs the stroke and tilt of the spring 3, and the abutting portion formed of the spherical surfaces 6a, 2a is connected. The fall of the member 6 can be absorbed.

By the above-described operation, the main sill 1 is placed in a horizontal state as shown in FIG. 1, and the load on the cab side applied to the main sill 1 is applied to the chassis 2 via the buffer spring 3 and the connecting member 6. It is transmitted and is supported by the chassis 2.

[0021]

As described above, according to the present invention, the connecting member connected to the lower end of the spring for supporting the main sill is guided by the elongated hole provided at the lower center of the connecting arm so as to be tilted. Since the lower surface of the connecting member and the upper surface of the chassis are spherical contact surfaces, even if there are some dimensional errors or assembly errors in the constituent members, they are absorbed by the long hole fitting section and the spherical contact section. It is possible to prevent excessive force from being applied to. As a result, the durability of the device is improved and the tilt operation and the restoration to the normal traveling state can be reliably performed.

Further, as compared with the conventional device as shown in Japanese Utility Model Laid-Open No. 2-74287, the number of parts is smaller and the structure is simplified.

[Brief description of drawings]

FIG. 1 is an external view of a main part of a tilt mechanism of a cab-over type vehicle according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 according to the embodiment of the present invention.

FIG. 3 is an illustration corresponding to FIG. 1 at the time of tilting according to the embodiment of the present invention.

[Explanation of symbols]

 1 Main sill 2 Chassis frame 3 Connecting arm 4 Bracket 5 Bracket 6 Connecting member 7 Slot 8 Pin

Claims (1)

[Claims] 1. A cab main sill and a chassis frame bracket are connected by a connecting arm, and the cab main sill is rotated around the bracket of the chassis frame against the elastic force of a spring attached to the lower part of the cab main sill. In a cab-over type vehicle configured to move and tilt the cab with respect to the chassis frame, an elongated hole is provided in the vicinity of a central portion of the connecting arm, and the main sill and a connecting member having a pin fixed to a side portion are connected to each other. The spring is installed between the pins, the pin is movably fitted in the elongated hole, and the lower surface of the connecting member is formed into a spherical surface so that it can contact the spherical portion formed on the upper surface of the chassis frame. The tilt mechanism of the cab suspension that has been characterized.