JPS5830876A - Hydraulic cylinder device used for tilted cab of automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic cylinder device used in a tilt cab of an automobile.

Typically, cab-over trucks have shorter cabs than bonnet trucks, trucks, etc. in which the internal combustion engine is located forward of the cab, and therefore the cab is located at the rear of the cab. In order to increase the volume of the loading platform, the internal combustion engine is placed below the cab, and in order to facilitate inspection and repair of various parts of the internal combustion engine, the cab is tilted. In addition, this type of cab-over type truck has been equipped with a hydraulic cylinder device for automatically tilting the cab.

In addition, in such cab-over type trucks,
It is desirable that the cab be constructed in such a way that vibrations received by the chassis frame during driving are not directly propagated to the cab.In recent years, the cab has been supported by the chassis frame via various springs. In this case, the cab is placed in a floating state via a spring to improve riding comfort during driving.

However, the above-mentioned hydraulic cylinder device is assembled into the cab-over type truck, and the cylinder end of the hydraulic cylinder device is connected to the chassis frame side, and the operating rod end is connected to the cab side with a pin. Therefore, in order to configure the cab to be placed in a floating state via a spring as described above and to prevent vibrations from the chassis frame side from being directly propagated to the cab side, it is necessary to keep the cab in a normal state. When the hydraulic cylinder is operated, the operating rod of the hydraulic cylinder is required to freely reciprocate with respect to the cylinder, and therefore, a hydraulic cylinder device to achieve such a purpose has a complicated structure. Production costs tended to increase.

An object of the present invention is to accurately tilt a cab, and to maintain the tilted state of the cab even if the center of gravity of the cab moves forward beyond the center of tilt during the tilt operation. In addition, when the cab is normally maintained, the connection between the operating rod end and the cab side is substantially released, and the A hydraulic cylinder used in automobile tilt cabs that allows the cab to be placed in a completely floating state, preventing vibrations from the chassis frame during driving from being directly propagated to the cab, improving riding comfort. The purpose is to provide equipment.

To this end, the hydraulic cylinder device used in the automobile tilt cab of the present invention includes a hydraulic cylinder whose cylinder end is pin-connected to the chassis frame, and a lock groove formed at the end of the operating rod of the hydraulic cylinder. The operating port and end of the hydraulic cylinder are housed so that they can slide back and forth, and the sleeve-type operating rod holder is connected to the cab side bracket with a pin, and the tip fits into the opening and groove of the operating rod end. The locking member is assembled to the operating rod holder so that the operating rod holder can be fitted together, and the opening of the locking member is attached to the operating rod holder. The operating rod receiver has a return spring mounted on the side thereof, and the locking member is movable by a relative positional shift between the cab side bracket and the operating rod receiver. Provided on the cab side bracket, when the cab is normally placed, the operation port, door end, and operation rod holder are kept unlocked, and when the cab is tilted, the operation rod is It includes a cam that maintains the end and its operating rod receiver in a locked condition.

Hereinafter, preferred specific examples of the hydraulic cylinder device used in the tilt cab of an automobile according to the present invention will be described with reference to the drawings.

1 to 4 show a specific example 10 of a hydraulic cylinder 7 device used in a tilt cab of an automobile according to the present invention applied to a cab-over type truck.

The hydraulic cylinder device 10 used in the tilt cab of the automobile includes a hydraulic cylinder 11 whose cylinder end is connected by a pin to a chassis frame 2S in a cab overboard 23, an operation port of the hydraulic cylinder 11, The opening formed at the end of the door 12, the groove 1-3, and the operation port/rad 12 end of the hydraulic cylinder 11 are accommodated in a reciprocating manner so that the cab in the cab over-hole 23 A through-leave type operating rod receiver 14 is connected to the side bracket 27 by a pin, and the tip thereof is connected to the operating port rad 12.
Move the mouth, king member 19, which is assembled to the operating rod receiver 14 so as to be able to reciprocate and slide so that it can be fitted into the lock groove 13 at the end, and the solenoid opening, the king member 19, to the operating rod receiver 14 side. so that one end is attached to its locking member 19 and the other end is attached to its operating rod receiver 1.
Return springs 2 attached to 4 and 4 respectively
1, the cab side bracket 27 is provided on the cab side bracket 27 so that the locking member 19 can be slid due to the relative positional deviation between the cab side bracket 27 and the operating rod receiver 14, and the cab 24 is in the normal state. When the cab 2 is placed in the
A cam 22 that maintains the end of the operating rod 12, its operating port, and the door receiver 14 in a locked state when the 4 is tilted.
It is composed of Toyoshi.

That is, the cab 24 of the cab-over type truck 23 includes a chassis-side bracket 26 fixed to the chassis frame 25, a cab-side bracket 27 fixed to the lower surface of the cab 24, and one end tilted to the chassis-side bracket 26. - The bin is connected via a bin, the other end is pin-connected to the lower part of the cab side bracket 27, and the tower link 28, one end is connected to the tilt bin side, and the other end is connected to the front part of the cab side bracket 27, respectively. A pin-connected shock absorber 29 is attached to the chassis frame 25 through a tilt mechanism such as a coil spring 30 disposed between the front side of the sonolink 28 and the front side of the cab side bracket 27. The hydraulic cylinder device 1° is rotatably mounted between the chassis frame 25 and the cab-side bracket 27.

The hydraulic cylinder 11 in the hydraulic cylinder device 1O has an operating rod 12 built therein so as to be able to reciprocate and slide via a piston (not shown), almost similarly to existing hydraulic cylinders.

A ring-shaped locking groove 13 is formed at the distal end side of the operating rod 12 incorporated into the hydraulic cylinder 11.

Of course, the lock groove 13 is formed by cutting out the side surface of the operating rod 12 in a ring shape along the circumferential direction.

In the hydraulic cylinder 11 and operating rod 12,
The operating rod 12 has the same configuration as existing hydraulic cylinders and operating rods, except that the opening and the groove 13 are formed on the distal end side of the operating rod 12. The internal configuration of 11 will be omitted.

The cylinder end of the hydraulic cylinder 11 in which the operating rod 12 having such a mouth and groove 13 is installed so as to be able to slide back and forth is located at a position spaced apart rearward from the chassis side bracket 26 by an appropriate distance. , its chassis frame 2
5 is connected with a pin.

Further, a sleeve-type operating rod receiver 14 configured to accommodate the end of the operating rod 12 of the above-mentioned hydraulic cylinder 11 in a reciprocating manner is connected to a position near the rear of the cab-side bracket 27 with a pin. There is.

That is, the operating rod receiver 14 is formed into a sleeve shape so that the distal end side of the operating rod 12 can be slidably received therein, and a mounting portion 17 is integrally formed on one end side. , furthermore, its installation is in part 17,
A bottle hole 18 is formed.

Furthermore, when the operating rod receiver 14 is attached to one side of the side wall, that is, the cab side bracket 27, the position on the front side of the side wall and approximately in the center is as follows.
A guide hole 16 is formed which communicates with the inside of the operating rod receiver 14 at a substantially right angle.

The guide hole 16 is connected to a locking member 19 which will be described later.
is supported in the operating rod receiver 14 so as to be able to reciprocate and slide, and has a height that is approximately the same as the width of the lock groove 13 formed on the tip side of the operating rod 12, and an outer diameter of the operating rod 12. It is formed into a substantially rectangular cross-section with a width larger than that of the main body.

Of course, in the operating rod receiver 14, the outside of the guide hole 16 is overlaid, and the lock 77 and member 1 are
9 is configured so that reciprocating sliding can be performed appropriately.

Guide hole 1 of the operating rod receiver 14 configured in this way
A locking member 19 is inserted into 6 so as to be slidable back and forth.

The opening, the king member 19, is formed from a steel plate to have a cross section shape, and one end has the above-mentioned operation opening,
A substantially semicircular groove 20 that fits into the lock groove 13 of the door 12 is formed.

The opening of the king member 19 is arranged such that the tip of the L-shaped portion is directed toward the operating opening, the pin hole 18 side of the dowel receiver 14, and the king member 19 is connected to one end side, that is, to the approximately semicircular groove 20 of the king member 19.
The side on which is formed is inserted into the operation port and the guide hole 16 of the door receiver 14.

Furthermore, its mouth, the king member 19, is always connected to its operating rod receiver 14 via the return spring=1.
It is configured to be placed on the side.

That is, one end of the return spring 21 is attached to the tip of the L-shaped portion of the locking member 19, and the other end is attached to the operating rod receiver 14.

Operating rod receiver 1 with locking member 19 and return spring 21 assembled as described above
4 is attached to the pin hole 18 of the portion 17, and is connected with a pin at a position near the rear of the cab-side bracket 27.

Of course, in such a state, the operating rod receiver 1
The distal end side of the operating rod 12 is housed within the casing 4 .

In addition, in the cab side bracket 27, the cab side bracket 27 and its operation port are located at a position forward of the part where the operation rod receiver 4 is connected with the pin.
A cam 22 is provided which slides its locking member 19 by displacement relative to the door receiver 14.

The cam 22 is formed from a steel plate and is
4 is in the normal state, it is hooked on the L-shaped part of the locking member 19, and protrudes downward from the two cab-side brackets so as to pull the locking member 19 forward. Welded in condition.

Of course, the cam z2 may be formed integrally with the two cab-side brackets in advance.

In addition, the cam 22 has two cab-side brackets and its operation rod holder! The shape may be arbitrary, such as a hook shape or a trigger shape, as long as the mouth and king member 19 can be slid by shifting the position relative to 4.

Therefore, when the cab 24 is normally placed, the L-shaped portion of the locking member 19 is hooked on the cam 22 and pulled out to the front, and the approximately semicircular shape of the locking member 19 is The groove 20 is accommodated in the guide hole 16 of the operating rod receiver 14 (second groove).
(see figure).

That is, one end of the king member 19 on the side where the groove 20 is formed does not protrude toward the operating port 12, and the operating rod 12 can freely slide back and forth with respect to the operating rod receiver 14. In other words, the operating rod receiver 14 and the end of the operating rod 12 are maintained in an unlocked state.

Further, when the operating rod 12 is pushed upward and the cab 24 is tilted, the cab side bracket 27 is rotated in accordance with the tilting operation.
At the same time, since the cam 22 is rotated toward the operating rod receiver 14, the locking member 19 is pulled back toward the operating rod receiver 14 by the return spring 21, and approximately half of the locking member 19 is rotated. The circular groove 20 projects toward the operating rod 12, and is fitted into the lock groove 13 of the operating rod 12 (see FIG. 3).

That is, the reciprocating sliding movement of the operating rod 12 relative to the operating rod receiver 14 is regulated by the locking member 19. In other words, the operating rod receiver 1 and the end of the operating rod 12 are maintained in a locked state. .

Of course, the above-mentioned hydraulic cylinder 11 is connected to the hydraulic pipe 31.3.
A hydraulic supply system (not shown) K is connected via 2.

The hydraulic supply system is constructed in the same manner as the hydraulic supply system for the hydraulic cylinders in existing cab-over type trucks, so a description of the construction will be omitted.

In addition, the above-mentioned cab/auto type 4 truck 23 is equipped with a spring configured to maintain the cab 24 in a normal state and prevent vibrations on the chassis frame 2S side from being directly propagated to the cab 24 side. Of course, a cab lock device (not shown) is provided. Therefore,
The cab 24 is configured to be placed in a completely floating state under normal conditions.

Next, the operation of the hydraulic cylinder device 10 used in the tilt cab of an automobile according to the present invention will be explained.

In the cab-over type truck 28, when the cab 24 is normally placed, as shown in FIG.
The two ends are maintained in an unlocked state.

That is, the L-shaped portion of the locking member 19 is hooked on the cam 22 and pulled forward against the return spring 21, and the approximately semicircular groove 20 of the locking member 19 is , since it is housed in the guide hole 16 of the operating rod receiver 14,
The operating rod 12 is placed in a state where it can freely slide back and forth with respect to the operating rod receiver 14, in other words,
The hydraulic cylinder device 10 does not interfere with the complete floating state of the cab 24, and such a complete floating state of the cab 24 is properly maintained.

Therefore, when the cab over type truck 23 is running, the vibration force on the chassis frame 25 side, the cab 2
It is not directly propagated to the 4th side, and the riding comfort is improved.

Further, when the cab 24 is tilted, pressure oil from the hydraulic supply system is sent to the hydraulic cylinder 11, and the operation port 12 is pushed upward by the pressure oil.

When the operating port 12 is pushed out in this way, the tip of the operating rod 12 slides inside the operating rod receiver 14, and furthermore, at a predetermined position, the tip of the operating port 12 is pushed out. The cab 24 comes into contact with the top wall of the operating rod receiver 14, and the cab 24 is tilted. In response to such tilting movement, the cab-side bracket 27 is rotated, and at the same time, the cam 22 is rotated against the operating rod receiver 14. Since the locking member 19 is rotated to the 14 side, the locking member 19 is rotated by the return spring 21 to the operation port and the door receiver 1.
4 side, the approximately semicircular groove 20 of the locking member 19 projects toward the operating rod 12 side,
The groove 20 is fitted into the operation port, the 2120 port, and the groove 13 (see FIG. 3).

That is, during such a tilt operation, when the tilt angle of the cab 24 reaches a predetermined angle, the operating rod receiver 14, its operating port, and the end of the door 12 are maintained in a locked state.

Therefore, even if the center of gravity of the cab 24 moves forward past the tilt center during the tilt operation, the tilted state of the cab 24 is reliably maintained, making it easy to inspect and repair the internal combustion engine and various parts. It can be done safely.

Of course, when returning from such a tilted state to the normal state, when the tilt angle of the cab 24 falls within a predetermined angle, the L-shaped portion of the locking member 19 is hooked to the cam 22 again, As in the case described above, the operating rod receiver 14 and the end of the operating rod 12 are returned to the unlocked state, and the cab 24 is returned to its normal state.

According to the present invention having the above structure, the cab can be tilted accurately, and even if the center of gravity of the cab moves forward beyond the tilt center during the tilt operation, the cab will not tilt. The tilt condition is reliably maintained, inspection and repair work on the internal combustion engine and various parts can be carried out safely, and furthermore, when the cab is kept in normal condition,
The connection between the operating port, door end, and the cab side is virtually released, making it possible to maintain the cab in a completely floating state, and vibrations from the chassis frame side when driving are transmitted to the cab side. A hydraulic cylinder device for use in a tilt cab of an automobile, which does not cause direct propagation and improves riding comfort, is obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a specific example of a hydraulic cylinder device used in a tilt cab of an automobile according to the present invention applied to a cab-over type truck, and Fig. 2 is a side view when the cab is normally placed. Fig. 3 is a partial vertical cross-sectional view showing the unlocked state of the operation port, door holder, and operating rod end; Figure 3 is a partial longitudinal sectional view showing the unlocked state of the operating rod holder and the operating rod end when the cab is tilted; 4 is a cross-sectional view taken along line 4--4 in FIG. 2. DESCRIPTION OF SYMBOLS 10... Hydraulic cylinder device used in the tilt cab of an automobile, 11... Hydraulic cylinder, 12... Operating rod, 13... Port, groove, 14... Operating rod receiver, 19. ... Locking member, 21 ... Return spring, 22 ... Cam, 23 ... Cab over type truck, 24 ... Cab, 25 ... Chassis frame, 27 ... Cab side bracket.

Claims (1)

[Claims] A hydraulic cylinder whose cylinder end is pin-connected to the chassis frame side, a lock groove formed in the operating rod end of the hydraulic cylinder, and a lock groove in which the operating rod end of the hydraulic cylinder is capable of reciprocating sliding. a sleeve-type operating rod holder that is connected to the cab-side bracket in such a way that the rod can be accommodated;
Assemble the locking member to the rod holder, so that the operating rod holder is on the side with one end on the locking member and the other end on the side with the operating rod holder on the side. Nine return springs are attached to the cab side bracket so that the locking member can be moved by the relative positional deviation between the cab side bracket and the operating rod receiver, and the cab is normally when placed in
a cam that maintains the operating rod end and the operating rod receiver in an unlocked state, and also maintains the operating port, the closed end and the operating rod receiver in the open state when the cab is tilted; Hydraulic cylinder device used in tilt cabs of automobiles including