JPS58128975A - Tilting cab type automobile - Google Patents

Abstract

PURPOSE:To simplicate the construction and enhance the mechanical strength without enlarging the size by furnishing a fluid pressure type operating cylinder, whose end of operating rod is coupled rotatably with the cab. CONSTITUTION:A coupling sleeve 15 is fitted slidably fore and aft on a connecting rod 16 coupled with a chassis 11 rotatably, so that the cab is allowed to move relatively with the chassis 11 and thus the cab 12 is supported on the chassis 11 elastically, and as a result the vibration on the chassis side when this truck 10 is running is not conducted directly to the cab 12 to cause hindrance of drop of the comfort to sit in the cab 12 owing to the locking action of the operating cylinder 14. If the switch is actuated, the operating rod 19 is extruded out of the cylinder 18, and the tip of the connecting sleeve 15 will run against the collision surface 40 of the rod 16 to cause rotation of the cab 12 round a shaft 23. Thus the cab 12 is lifted by the cylinder 14.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a tilt cab type motor vehicle.

Traditionally, tilt-cab vehicles of this type have been constructed by rotating the cab relative to the vehicle into a tilt-bin position, lifting the cab from a riding position to a leaning position, and then moving the cab from a leaning position to a riding position. It is equipped with a hydraulic jack, i.e., a hydraulic type operating cylinder, for lowering the machine.

However, since the cab is resiliently supported on its chassis, the operating cylinder is provided with means for allowing free movement of the cab on the chassis and for tilting the cab from the riding position. In the over-tilt position (over-tilt range) where the center of gravity of the cab is tilted forward beyond the tilt 7-yaft position,
Means shall be provided to restrain movement of the cab relative to the chassis.

For example, British Patent No. 1,399,612 describes the mechanical construction of these means, and U.S. Pat. No. 1,447,673 describes the hydraulic circuit construction. It has been disclosed and used.

However, the former is Kiya!・The piston rod is fitted into the bearing hole of the trunnion rotatably held in the bracket so that it can slide back and forth, and the hydraulic jack is connected to the cab, allowing smooth free movement of the cab relative to the chassis. Furthermore, the trunnion must be thick or made of expensive material for sufficient mechanical strength, and the latter is structurally more complex than the mechanical former. However, it required advanced technology to manufacture and became expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a means for smoothing the free movement of a cab when the cab is in a riding position relative to the chassis, i.e. in a driving position, and for the cab to be tilted relative to the chassis around a tilt shaft. a cab that is lifted from a riding position to a tilted position and further has means for reliably restraining the tilting movement of the cab relative to the chassis when the cab's center of gravity exceeds the tilt shaft and the cab tilts forward; - Equipped with a tilting means, the means for smoothing the free movement of the cab and the means for suppressing the tilting movement of the cab improve the mechanical strength, simplify the structure, and reduce the number of parts without increasing the size. Tilt, which reduces production costs.
Providing cab-type automobiles.

To solve these problems, the tilt cab type automobile of the present invention is provided with a hydraulic operating cylinder having an operating rod end rotatably connected to the cab as the cab tilting means, and a cylinder end of the operating cylinder. a connecting sleeve arranged at the rear of the tilt shaft, and a connecting rod having one end rotatably connected to the connector 7 and the other end fitted to the connecting sleeve so as to be reciprocatingly slidable; The cab tilts relative to the chassis.
A cylinder located on the side of the chassis to prevent the cylinder from being pulled upwards when being lifted around the shaft from the riding position to the leaning position.
It is equipped with a locking device.

Hereinafter, preferred specific examples of the tilt cab type vehicle according to the present invention will be described with reference to the drawings.

1 to 3 show a tilt cab motor vehicle 10 of the present invention embodied as a tilt cab truck.
It shows.

The tilt cab type truck 10 includes a shaft 11, a cab 12 disposed on the chassis 11 in front of the chassis 11, and a structure such that the cab 12 is elastically supported on the sheep chassis 11. Left and right cab front suspensions 13 connect the front of the cab 12 to the chassis 11, and the rear of the cab 12 is connected to the chassis 11 so as to elastically support the cab 12 on the chassis 11. The chassis 11 and the cab 12 are mounted behind the cab rear mount (not shown) and the cab front suspension 13 for rotating the cab 12 between the riding position and the tilted position. and a left and right hydraulic operation cylinder 14 with one end of the operation rod 19 rotatably connected to the cab 12, and a connection integrally formed with the end of the cylinder 18 of the operation cylinder 14. A sleeve 15, and a connecting rod 16 rotatably connected to the chassis 12 at one end and slidably reciprocally fitted to the connecting sleeve 15 at the other end behind the cab front suspension 13; That cab 12 is that chassis 1
When lifted from the riding position to the tilted position about the tilt shaft 23 relative to the cylinder 18
the / to prevent it from being pulled upwards.
a cylinder lock device 17 disposed on the Y/11 side;
In order to fix the cab 12 to the chassis 11 in the riding position of the cab 12, a carrier is placed between the rear of the cab 12 and the cab rear mount!
- Contains a locking device (not shown).

The left and right cab front suspensions 13 are respectively bolted to the lower platen 11) 2
0, at the front of the cab 12, an upper bracket 21 bolted to the underside of the cab 12 and extending longitudinally of the truck 10, i.e. the chassis (upper and lower platters) 20.21 a tilt shaft 23 rotatably connecting the forward end of the vertical link 22 to the lower bracket 20; and a tilt shaft 23 rotatably connecting the forward end of the vertical link 22 to the lower bracket 20; ) 211C rotatably coupled coupling shaft 24 and a coil spring 2 arranged between the spring seat 27 of its upper bracket 21 and the spring seat 28 of its longitudinal link 22;
5, and a shock absorber 26 rotatably connected to the tilt shaft 23 at one end and to the pin 29 of the upper bracket 21 at the other end.

The hydraulic operation cylinder 14 is a hydraulic cylinder, and includes a cylinder 18 , a piston (not shown) fitted in the cylinder 18 so as to be able to reciprocate, and one end of the cylinder 18 at one end thereof. An operating rod 1 that can be taken in and out and whose other end is connected to the piston.
9, the cylinder 18 is a hydraulic power source device,
Piping 38 is connected to a hydraulic unit (not shown) including control valves, etc.
39.

The connecting sleeve 15Fi is integrally formed at the end of the cylinder 18 of the operating cylinder 14 so as to extend in the axial direction.

One end of the operating rod 19 in the operating cylinder 14 configured in this way is connected to the above-mentioned cab front suspension 13, that is, a connection arranged substantially parallel to the axis of the tilt shaft 23 at the rear of the upper bracket 21. - rotatably connected via a ring 30.

The connecting port 16 is rotatably connected to the chassis 11 via a connecting pin 31 at the rear of the connection 13 to the cab front suspension, and a connecting sleeve at the end of the cylinder 18 of the operating cylinder 14. 15 so as to be slidable back and forth.

Of course, the above-mentioned connecting sleeve 15 is made sufficiently longer than the other end of the connecting rod 16 into which it is fitted, so that when the cab 12 is in the riding position, the cab 12 is vertically moved relative to the chassis 11. When moving, the reaction force of the compressed air when the trapped air is compressed is not large enough to be taken into account.

The cylinder locking device 17 prevents the cylinder 18 of the operating cylinder 14 from being pulled upward when the cab 12 is lifted from the riding position to the tilting position relative to the tilt shaft 23 relative to the shank 11. The hook formed on the connecting sleeve 15 is rotatably connected to the chassis 11 through a pin 36 such that one end of the hook can be hooked into the groove 33 and the other end is rotatably connected to the chassis 11 through a pin 36. an electromagnetic coil 34 as an actuator that rotates the hook 32 toward the connection sleeve 15, and an electromagnetic coil 34 that is arranged so as to be able to reciprocate and slide within the electromagnetic coil 34, and one end of which is attached to the hook 3.
2, and a return spring 37, one end of which is attached to the hook 32 and the other end attached to the chassis 11, so as to separate one end of the hook 32 from the groove 33. It is configured.

Of course, the electromagnetic coil 34 is rotatably connected to the chassis 11 via a pin (not shown).

The cylinder locking device 17 so configured is such that when the cab 12 is lifted to the forward position by the riding position force S around the tilt shaft 23 relative to the chassis 11, the rod 35 is connected to the electromagnetic coil. 34 and drives one end of the hook 32 to hook into the groove 33 of the connecting sleeve 15.

That is, the electric circuit (not shown) of the electromagnetic coil 34
In the hydraulic unit of the operation cylinder 14, there is a cab tilt valve inserted into the electric circuit of the control valve.
connected to a switch (not shown).

Furthermore, in the cylinder locking device 17, the actuator for rotating the hook 32 has been described as consisting of the electromagnetic coil 34 and the rod 35, but it is of course possible to use a hydraulic or pneumatic cylinder as the actuator. It is.

Next, the cab tilt operation of the truck 1o mentioned above will be explained.

In the truck IO, if the cab 12 is placed in the riding position as shown in FIG. , electromagnetic coil 3
4 is not energized, one end of the hook 32 is disengaged from the groove 33 by the return spring 37 and the connecting sleeve 15 is unlatched.

In such a state, the connecting sleeve 15 is fitted to the connecting rod 16 rotatably connected to the chassis 11 so as to be able to reciprocate and slide, so that the cab 12 is connected to the chassis 11.
The cab 11 is elastically supported on the chassis 11, and as a result, when the truck 10 is traveling, vibrations on the chassis 11 side are transferred to the cab 12 side. It is not directly propagated, and the deterioration of the riding comfort of the cab 12 due to the locking action of the operating cylinder 14 is prevented.

Also, the cab 12 is rotated about the tilt shaft 23 and lifted from the riding position to the tilted position by the operating cylinder 14, as shown in FIGS.
When the cab tilt switch is energized, the operating rod 19 is pushed out of the cylinder 18 and the connecting sleeve 1
The tip of 5 hits the contact surface 4o of the connecting rod 16,
While rotating the cab 12 around the tilt shaft 23, the cab 12 is lifted upward by the operating cylinder 14.

In conjunction with such operation, when the electromagnetic coil 34 is energized, the rod 35 is retracted into the electromagnetic coil 34, the hook 32 is rotated against the return spring 37, and one part of the hook 32 is rotated. The end of the connecting sleeve 15 is hooked into the groove 33 .

Therefore, in such a state, even if the cab 12 is lifted and the center of gravity of the cab moves forward beyond the tilt shaft 23, the cylinder 18 is prevented from sliding and the proper tilted state is maintained, so that the engine Inspection and maintenance work becomes possible.

According to the above invention, there is provided a hydraulic operating cylinder for lifting and lowering the cab from the riding position to the tilted position and from the tilted position to the riding position with respect to the chassis.
The cab is rotatably connected to the chassis by a connecting sleeve disposed at the cylinder end of the operating cylinder and a connecting rod fitted into the connecting sleeve so as to be able to slide back and forth, so that the cab is in the riding position with respect to the chassis. One day,
In other words, when the cab is in a running position, the free movement of the cab is smoothly guided.In particular, even when the cab is free to move under a large load, the cab is guided smoothly. raised from the riding position to the reclined position around the tilt shaft relative to the chassis;
In addition, when the cab's center of gravity exceeds the tilt shaft and the cab attempts to tilt further forward, the chassis is locked by a cylinder locking device that prevents reciprocating sliding of the connecting sleeve relative to the connecting rod. The tilting movement of the cab is reliably suppressed, and the means for smoothing the free movement of the cab and the means for suppressing the tilting movement of the cab are not made large, and the mechanical strength of these means is improved. The structure has been simplified,
The number of parts is reduced, manufacturing costs are reduced, and it is extremely practical.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front side view of a tilt-cab truck embodying the present invention, with the cab of the truck in the riding position; FIG. 2 is similar to FIG. 1; FIG. 3 is a partially enlarged side view showing the vicinity of the cylinder lock device. 10...1 Ilt cab type truck, 11...Chassis, 12...Cab, 13...Cab front suspension, 14...Fluid pressure type operation cylinder,
15...Connection sleeve, 16...Connection rod, 1 piece...Cylinder lock device, 18...Cylinder, 1
9...Operation rod.

Claims (1)

[Scope of Claims] A steering wheel rotatably connected to the chassis through a tilt shaft at the front of the chassis so as to be rotated between a riding position and a tilted position; A cab elastically supported by a cylinder, a piston fitted into the cylinder so as to be able to reciprocate, and one end of the cylinder being able to be inserted into and taken out from the outside of the cylinder, and the other end being inserted into and out of the outside of the cylinder. a hydraulic operating cylinder consisting of an operating rod connected to the piston, and one end of the operating rod rotatably connected to the cab behind the tilt shaft; and a connecting sleeve disposed at the cylinder end of the operating cylinder. and a connecting rod having one end rotatably connected to the chassis at the rear of the tilt shaft and the other end fitted in the connecting sleeve so as to be reciprocally slidable; and a cylinder locking device disposed on the chassis side of the tilt shaft to prevent the cylinder from being pulled upwardly when the vehicle is lifted from a riding position to a tilted position. .