JPS5893674A - Tiltable-cab type automobile - Google Patents

Abstract

PURPOSE:To simplify construction, by a method wherein a connecting sleeve is provided at an operating rod of a hydraulic cylinder for setting a cab into a riding position or a tilted position, and the operating rod is rotatably connected to the cab through the connecting sleeve and a connecting rod capable of being reciprocally slidden in the connecting sleeve. CONSTITUTION:When the cab 12 is in the riding position, a projection 17 provided at the tip of the connecting sleeve 15 is released from a projection clamp 18 by retracting the operating rod 31, and the cab 12 is elastically supported on a chassis 11. When the cab 12 is lifted to the tilted position, the tip of the sleeve 15 collides against a support surface 35 of the connecting rod 16, and when the cab 12 is rotated until the center of gravity thereof approaches a tilting shaft 23, the projection 17 is hooked by a curved surface of the clamp 18 in the condition of being pressed against the support surface 35, and is slidden on the curved surface. Then, the operating cylinder 14 is stopped, the cab 12 is prevented from being tilted forwards in such an extent that the center of gravity thereof exceeds the shaft 23, and is maintained in the tilted position. Accordingly, a means to restrict the tilting movement of the cab 12 is not increased in size, the construction is simplified, and the number of component parts is reduced.

Description

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

Traditionally, this type of tilt-cab vehicle rotates the cab relative to the chassis around a tilt pin to lift the cab from a riding position to a tilted position, and to move the cab from a tilted position to a riding position. For lowering it is equipped with a hydraulic jack, i.e. a hydraulic operating cylinder.

However, since the cab is resiliently supported on its chassis, the operating cylinder is provided with means to allow free movement of the cab on the chassis and to move the cab from the riding position. When raised into a tilted position, means have been provided to restrict movement of the cab relative to the chassis in the overtilt range, where the center of gravity of the cab is tilted forward beyond the tilt shaft.

A mechanical construction of these means can be found, for example, in British Patent No. 1,399,612, and a fluid-pressure circuit construction can be found in US Pat. No. 1,447,6, for example.
No. 73, respectively, and have been used.

However, in the former case, the piston rod is slidably fitted in the bearing hole of the trunnion rotatably held in the cab bracket, and the hydraulic jack is connected to the cab, so the cab can freely move relative to the chassis. Moreover, for sufficient mechanical strength, the trunnion must be made thick or made of expensive material; In contrast, it was structurally more complex, required advanced technology to manufacture, and was 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 mechanical strength, simplify the structure, and reduce the number of parts without increasing the size. Our goal is to provide a tilt-cab type vehicle that reduces production costs.

To solve these problems, the tilt cab type automobile of the present invention is provided with a hydraulic operating cylinder as the cab tilting means, and further provided with a hydraulic operating cylinder disposed at one end of the cylinder and the other end of the operating rod of the operating cylinder. At the rear of the tilt shaft, one end is rotatably connected to the cab, the other end is fitted into the connecting sleeve so as to be able to reciprocate, and the receiver is used to receive the connecting sleeve. In a direction including a connecting rod having a surface and an axis substantially parallel to the axis of rotation of the connecting rod,
When the cab is lifted from the riding position to the tilted position around the tilt shaft with respect to the chassis, the connecting sleeve is hooked onto the protrusion, and the retainer is pressed against the surface. and a protruding clamp placed on its cab to hold it in place.

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 73 show a tilt cab type vehicle 1 of the present invention embodied as a tilt cab type truck.
It shows 0.

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 cab 12 disposed on the chassis 11 in front of the chassis 11. Left and right cab front suspensions 13 that connect the front of the cab 12 to the chassis 11; and a cab that connects the rear of the cab 12 to the chassis 11 so as to elastically support the cab 12 on the chassis 11. - A rear mount (not shown) between the chassis 11 and the cab 12 behind the cab front suspension 13 so as to rotate the cab 12 between the riding position and the tilted position. The left and right hydraulic operation cylinders 14 arranged in 12, and the other end of the connecting rod 1 is fitted into the connecting sleeve 15 so as to be slidable back and forth.
6 and the protrusion 1 formed at the tip of the connecting sleeve 15.
7, a protrusion flange 18 disposed on the cab 12 for the protrusion 17, and a protrusion flange 18 disposed on the cab 12 at the rear of the cab 12 and the cab for fixing the cab 12 to the chassis 11 in the riding position of the cab 12.・Includes a rear mount and a cab lock device (not shown) located on the rear mount.

Left and right cab front suspension 13cm, each with a lower bracket delt-tightened to the chassis 11')
20, in front of the cab 12, an upper bupket 21 delted to the underside of the cab 12, and the track 10. That is, the upper and lower platters 110.21 extend in the longitudinal direction of the chassis 11.
a vertical link 22 disposed therebetween; a tilt shaft 23 rotatably connecting the front end of the vertical link 22 to the lower platoon 2G;
a coupling shaft 24 rotatably connecting the rear end of 2 to its upper bracket 21; a coil spring disposed between a spring seat 27 of its upper bracket 21 and a spring seat 28 of its longitudinal link 22; 25, 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 piston (not shown) fitted into the cylinder 301 so as to be able to reciprocate and slide.

The cylinder 30 includes an operating rod 31 whose one end can be put in and out of the outside of the cylinder 30 and whose other end is connected to the piston at one end' of the cylinder 30. Hydraulic unit (including
(not shown) via pipes 32 and 33.

The cylinder 30 is spaced a suitable distance behind the tilt shaft 23 and has two ends rotatably connected to the chassis 11 via a pin.

Further, the operating rod 31 is integrally formed with a connecting sleeve 15 extending in the axial direction at the other end.

The 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 moves up and down relative to the chassis 11 in the riding position of the cab 12, the trapped air is compressed. If the reaction force of the compressed air is taken into account when

In addition, the sheep connecting sleeve 15 has a locking mechanism that prevents the connecting rod 1 from being pulled out when the cab 12 moves up and down relative to the chassis 11 in the riding position of the cab 12.
(not shown).

The connecting rod 16 is rotatably connected at one end to a connecting pin 36 arranged parallel to the axis of the tilt shaft 23 at the rear of the cab front suspension 13, that is, the upper bracket 21. pin 36
The stepped abutment adjacent to the abutment has a surface 35 on which the distal end of the connecting sleeve 15 can be received.

The connecting pin 36 is connected to the upper bracket 21 on the track l.
A pair of hanging plate portions are provided at the rear with appropriate spacing in the lateral direction of G, so that it can be passed between the hanging plate portions,
Both ends are held by the hanging plate. Therefore, one end of the connecting rod 16 is located between the hanging plate portions of the upper bracket 21, and one end thereof is rotatably connected to the connecting pin 36.

The protrusion 17 extends in a direction including the axis of rotation of the connecting rod 16, that is, an axis substantially parallel to the axis of the connecting rod 36.
In this case, it is formed as a flange protruding from the tip of the connecting sleeve 15, and the lower surface of the flange is machined into a partially spherical surface, but it is of course possible to machine it into a chi-shaped surface. Further, the protrusion length of the protrusion 17 is determined so that it fits between the hanging plate portions of the upper bracket 21.

Further, the protrusion 17 is slid onto the protrusion flange 18 while being hooked onto the protrusion flange 18, and can be deformed into various shapes.

As can be seen from FIG. 3, the protruding flanges 18 are protruded from the inner surfaces of the pair of hanging plate portions of the upper bracket 21 below the connecting bin 36 and in close proximity to the connecting bin 36, facing each other. There is. In particular, those protruding flanges 18 have an upper surface curved concentrically to the axis of the connecting bin 36, so that the cab 1z is connected to its chassis 1.
1, when the tail shaft 23 is lifted from the riding position to the tilted position by the operation cylinder 14, the connecting sleeve 15 is brought into contact with the surface 35 while the protrusion 17 is hooked. In other words, it is held in a pressed state and the projection 17 is slidably moved on the curved surface.

Of course, the curved surface of the projection flange IS is formed in a shape complementary to the partially spherical surface of the projection 17, as shown in FIG.

Next, the cab tee 4 of the truck 10 described above The root operation will be explained.

In the truck 10, if the cab 12 is placed in the riding position as shown in FIG. 1, the operating rod 31 is retracted into the cylinder 30.
The protrusion 17 formed at the tip of the connecting sleeve 15 is detached from the protrusion clamp 18, so that the cab 12 is attached to the chassis 11.
The cab 'iz is elastically supported on the chassis 11. As a result, when the truck 10 is running, vibrations on the chassis 11 side are caused by the cab 12.
The deterioration of the riding comfort of the cab 12 due to the locking action of the operation cylinder 14 is prevented.

Also, if 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. 2 and 3, the operating rod 31 is attached to the other end of the cylinder 30. The tip of the connecting sleeve 15 abuts against the surface 35 of the connecting rod 16, and the cab 12 is moved to the tilt shaft 23.
The cab 12 is lifted upward by the operation cylinder 14 while being rotated.

When the cab 12 is rotated around the tilt shaft 23 until the center of gravity of the cab approaches the upper part of the tilt shaft 23, the protrusion 17 is pressed against the curved surface of the protrusion flange 18, with the receiver pressed against the surface 35. The operating cylinder 14 is stopped at the position shown in FIG. 2, and the cab 12 is tilted forward so that the center of gravity of the cab exceeds the tilt shaft 23. It is held in a tilted position on the chassis 11.

Therefore, 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.
A connecting sleeve disposed at one end of the cylinder of the operating cylinder and the other end of the operating rod, and a connecting rod fitted into the connecting sleeve so as to be able to reciprocate;
Since it is rotatably connected to the cab, the free movement of the cab is smoothly guided when the cab is in the riding position relative to the chassis, i.e. in the driving position, especially when large loads are applied. The cab is guided smoothly even in the free movement of the cab, and the cab is lifted from the riding position to the tilted position by the rotation of the tilt shaft relative to the chassis, and the center of gravity of the cab is When the cab tries to tilt further forward beyond the tilt shaft, the protrusion formed at the tip of the connecting sleeve and the protrusion flange on the cab side
The tilting movement of the cab relative to the chassis 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;
In addition, the mechanical strength of these means is improved, the structure is simplified, the number of parts is reduced, and the manufacturing cost is reduced, making them extremely practical.

[Brief explanation of the drawing]

FIG.
FIG. 2 is a partial front side view of a cab-type truck shown in a partially cutaway state with the cab of the truck in the riding position; FIG. 2 is a partial front side view of the truck shown in FIG. 1 with the cab of the truck in the tilted position; FIG. 3 is a sectional view taken along line 3--3 in FIG. 2. DESCRIPTION OF SYMBOLS 10... Tilt cab type truck, 11... Chassis, 12... Cab, 13... Cab-front suspension, 14... Fluid pressure type operation cylinder,
1.Connection-sleeve, 16.Connection rod, 17.
...Protrusion, 18...Protrusion flange. Procedural amendment March 15, 1980 Commissioner of the Japan Patent Office Shima 1) Haruki Tono 1, Indication of the case Tilt cab type automobile 3, Person making the amendment Relationship to the case Patent applicant address 3 Hinodai, Hino City, Tokyo 1-chome 1 name (54
6) Hino Motors Co., Ltd. Representative: Masashi Arakawa 4゜Agent: 167 Address: 3-18-13 Nishioginami, Suginami-ku, Tokyo Voluntary 6 Subject of amendment 7, Contents of amendment (1) Specification of the present application and We will engrave the drawings on separate sheets. (2) We will attach a document certifying the authority of representation as shown in the attached sheet. that's all

Claims (1)

[Scope of Claims] A shaft rotatably coupled to the chassis at the front of the chassis via a tilt shaft so as to be rotated between a riding position and a tilted position; A cab elastically supported thereon, a cylinder, a piston fitted in the cylinder so as to be able to reciprocate and slide, and one end of the cylinder being able to be inserted into and removed from the outside of the cylinder, a hydraulic operating cylinder having one end of the cylinder and the operating rod rotatably connected to the chassis behind the tilt shaft; A connecting sleeve disposed at one end of the cylinder and the other end of the operating rod, and behind the tilt shaft, one end is rotatably connected to the cab, and the other end is fitted into the connecting sleeve so as to be reciprocally slidable. or (2) a connecting rod having a surface for receiving the connecting sleeve, a protrusion disposed on the connecting sleeve in a direction including an axis substantially parallel to the axis of rotation of the connecting rod, and a connecting rod that receives the connecting sleeve; When lifting the chassis around its tilt shaft from the riding position to the leaning position,
A tilt-cab type automobile including a protrusion flange arranged on the cab so as to hold the connecting sleeve in abutment against a surface while hooking the protrusion.