JPS6364352B2 - - Google Patents

Description

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

Typically, a cab-over type truck has a shorter cab than a bonnet-type truck, in which the internal combustion engine is placed in front of the cab, and therefore the internal combustion engine is placed at the rear of the cab. Since the volume of the loading platform can be increased,
An internal combustion engine is disposed below the cab, and the cab is constructed such that it can be tilted to facilitate inspection and repair work on various parts of the internal combustion engine.
Hydraulic cylinder devices have been installed in over-type trucks to automatically tilt the cab.

In addition, in such a cab-over type truck, the cab is exposed to the shock of the car while driving.
It is desirable to have a structure in which vibrations on the frame side are not directly propagated to the cab, and in recent years,
The cab is connected to the shaft via various springs.
The cab is supported on the frame side, in other words, the cab is placed in a floating state via a spring, so that the ride comfort during driving can be improved.

However, in that cab-over type truck,
The above-mentioned hydraulic cylinder device is assembled, 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 by pins, so that the cab is connected as described above. In order to configure the structure so that vibrations on the chassis frame side are not directly propagated to the cab side by being placed in a floating state via a spring, the hydraulic cylinder must be operated when the cab is in a normal state. The rod is required to freely reciprocate relative to the cylinder, and therefore, hydraulic cylinder devices for achieving such a purpose tend to have complicated structures and high production costs.

An object of the present invention is to accurately perform a tilting motion of 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 the tilt during the tilting motion. In addition, when the cab is kept in normal condition, the connection between the operating rod end and the cab side is essentially released, and the A hydraulic cylinder used in automobile tail cabs that allows the cab to be placed in a completely floating state, preventing vibrations from the chassis frame side during driving from being directly transmitted to the cab side, improving ride comfort. The purpose is to provide equipment.

With these issues in mind, the hydraulic cylinder device used in the tail cab of an automobile according to the present invention has the following features:
A hydraulic cylinder whose cylinder end is pin-connected to the chassis frame side, a lock groove formed in the rod end of the operating rod in the direction perpendicular to the axis of the operating rod in the hydraulic cylinder, and a lock groove formed in the rod end of the operating rod in the direction perpendicular to the axis of the operating rod in the hydraulic cylinder. A guide having a sleeve portion that is reciprocally slidably housed and connected to the cab side bracket with a pin, and formed in the sleeve portion at a predetermined position and extending in a direction perpendicular to the axis of the sleeve portion. A sleeve-type operating rod receiver having a hole, a locking member fitted into the guide hole so that the tip can be moved in and out of the sleeve portion so as to fit into the locking groove of the operating rod, and the locking member a return spring disposed between the sleeve-type operating rod receiver and the locking member such that the tip of the operating rod protrudes into the sleeve portion of the operating rod when the cab is normally placed; The cab side is configured to maintain the rod end and its operating rod receiver in an unlocked state, and to maintain the rod end of its operating rod and its operating rod receiver in a locked state when the cab is tilted. The locking mechanism is caused by the relative positional deviation between the cab-side bracket and the operating rod holder provided on the bracket and caused by the drive of the hydraulic cylinder.
It is configured to include a cam that moves the member.

Hereinafter, preferred specific examples of the hydraulic cylinder device used in the tail 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 device used in a tail cab of an automobile according to the present invention, which is applied to a cab-over type truck.

The hydraulic cylinder device 10 used in the tail cab of the automobile includes a hydraulic cylinder 11 whose cylinder end is connected by a pin to a chassis frame 25 in a cab-over type truck 23, and an operating rod 12 in the hydraulic cylinder 11 that is connected to the axis of the hydraulic cylinder 11. In the orthogonal direction, the rod end of the operating rod 12, in other words, the lock groove 13 formed on the distal end side of the operating rod 12, and the sleeve portion that accommodates the distal end side of the operating rod 12 in a reciprocating manner. a pin connected to the cab-side bracket 27 of the cab-over type track 23, and formed on the sleeve portion at a predetermined position and extending in a direction perpendicular to the axis of the sleeve portion. A sleeve-type operating rod receiver 14 is provided with a guide hole 16, and the guide hole 1 is such that the tip can be inserted into and taken out from the sleeve portion so that it can be fitted into the lock groove 13 of the operating rod 12.
Locking member 19 fitted to 6
and a return spring 2 disposed between the sleeve-type operating rod receiver 14 and the locking member 19 so that the tip of the locking member 19 projects into the sleeve portion.
1, when the cab 24 is normally placed, the distal end of the operating rod 12 and the operating rod receiver 14 are maintained in an unlocked state, and when the cab 24 is tilted, the operating rod is 12 and its operating rod receiver 14 in a locked state.
As the cab side bracket 27 is driven, the cab side bracket 27
and a cam 22 that moves the locking member 19 by the relative positional deviation between the locking member 19 and the operating rod receiver 14.

That is, the cab-over type truck 23
The cab 24 in the figure includes a chassis side bracket 26 fixed to a chassis frame 25, and a cab side bracket 2 fixed to the lower surface of the cab 24.
7. A link 28 having one end pin-connected to the chassis side bracket 26 via a tail pin and the other end pin connected to the lower part of the cab side bracket 27; one end connected to the tail pin side and the other end is in the front part of the cab side bracket 27,
Shock absorbers 2 each connected with a pin
9. A coil disposed between the front side of the link 28 and the front side of the cab side bracket 27.
The hydraulic cylinder device 10 is rotatably attached to the chassis frame 25 via a tail mechanism including a spring 30 and the like, and is assembled between the chassis frame 25 and the cab side bracket 27.

In the hydraulic cylinder 11 of the hydraulic cylinder device 10, an operating rod 12 is incorporated so as to be able to reciprocate and slide via a piston (not shown), almost like existing hydraulic cylinders.

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

Of course, the lock groove 13 is the same as that of the operating rod 1.
It is formed by cutting out the side surface on the tip side of 2 in a ring shape along the circumferential direction.

The hydraulic cylinder 11 and the operating rod 12 have the same structure as existing hydraulic cylinders and operating rods, except that the locking groove 13 as described above is formed on the tip side of the operating rod 12. The configuration, particularly the internal configuration of the hydraulic cylinder 11, will be omitted.

Operating rod 1 equipped with such a locking groove 13
Hydraulic cylinder 1 in which cylinder 2 is built in so that it can slide back and forth
The cylinder end of No. 1 is connected to its chassis side bracket 26.
The seat frame 25 is connected to the chassis frame 25 with a pin at a position spaced rearward from the seat frame 25 at an appropriate distance.

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

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 reciprocated therein, and a mounting portion 17 is integrally formed on one end side. Furthermore, a pin hole 18 is formed in the attachment portion 17.

Furthermore, one side of the side wall of the operating rod receiver 14, that is, the front side of the side wall when it is attached to the cab side bracket 27, and
A guide hole 16 is formed at approximately the center position and communicates with the inside of the operating rod receiver 14 at approximately right angles.

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

Of course, the outside of the guide hole 16 of the operating rod receiver 14 is padded to allow the locking member 19 to slide back and forth properly.

A locking member 19 is inserted into the guide hole 16 of the operating rod receiver 14 configured in this manner so as to be able to slide back and forth.

The locking member 19 is formed from a steel plate to have a substantially L-shaped longitudinal section, and has a substantially semicircular groove 20 formed at one end to fit into the locking groove 13 of the operating rod 12 described above. ing.

The locking member 19 is configured such that the tip of the L-shaped portion is directed toward the pin hole 18 side of the operating rod receiver 14, and one end side, that is, the side where the approximately semicircular groove 20 is formed, It is inserted into the guide hole 16 of the operating rod receiver 14.

Further, the locking member 19 is always drawn toward the operating rod receiver 14 via the return spring 21.

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.

The operating rod receiver 14, to which the locking member 19 and return spring 21 are assembled as described above, is connected by a pin to the rear side of the cab side bracket 27 at the pin hole 18 of the mounting portion 17. Ru.

Of course, in such a state, the tip end of the operating rod 12 is accommodated in the operating rod receiver 14.

In addition, in the cab side bracket 27,
The locking member 19 can be slid to a position forward of the pin-connected portion of the operating rod receiver 14 due to the relative positional shift between the cab side bracket 27 and the operating rod receiver 14. A cam 22 for moving is provided.

The cam 22 is formed from a steel plate,
When the cab 24 is in its normal position, it is hooked onto the L-shaped portion of its locking member 19 and extends downwardly from its cab side bracket 27 so as to pull the locking member 19 forward. It is welded with a protrusion.

Of course, the cam 22 may be formed integrally with the cab side bracket 27 in advance.

Also, the cam 22 is caused by the relative positional deviation between the cab side bracket 27 and the operating rod receiver 14 to cause the locking member 19 to
The shape can be arbitrary, such as a hook type or a trigger type, as long as it can be slid.

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, so that the locking member 19 is approximately The semicircular groove 20 is accommodated in the guide hole 16 of the operating rod receiver 14 (see FIG. 2).

That is, one end of the locking member 19 on the side where the groove 20 is formed does not protrude toward the operating rod 12 side, and the operating rod 12 can freely slide back and forth with respect to the operating rod receiver 14. If so, the operating rod receiver 1
4 and its operating rod 12 end are maintained in an unlocked state.

Also, when the operating rod 12 is pushed upward and the cab 24 is tilted,
In response to the tilt movement, the cab side bracket 27 is rotated, and at the same time, the cam 22 is rotated toward the operating rod receiver 14, so that the locking member 19 is rotated by the return spring 21. The locking member 19 is pulled back toward the operating rod receiver 14 side, and the approximately semicircular groove 20 of the locking member 19 is projected toward the operating rod 12 side, and the groove 20 is fitted into the locking groove 13 of the operating rod 12. (See Figure 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 14 and the end of the operating rod 12 are maintained in a locked state. be done.

Of course, the above-mentioned hydraulic cylinder 11 is connected to a hydraulic pressure supply system (not shown) via hydraulic pipes 31 and 32.
connected to.

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

In addition, the above-mentioned cab-over type truck 23
maintains the cab 24 in a normal state, and the vibration on the side of the chassis frame 25 causes the cab 24 to
It goes without saying that a cab lock device (not shown) with a spring is provided to prevent direct propagation to the side. Therefore, the cab 24
is configured to be in a completely floating state under normal conditions.

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

In the cab-over type truck 23,
When the cab 24 is in normal condition,
As shown in Figure 2, the operating rod receiver 1
4 and its operating rod 12 end are maintained in an unlocked state.

That is, the L-shaped portion of the locking member 19 is hooked on the cam 22, pulled out to the front against the return spring 21, and is inserted into the approximately semicircular groove of the locking member 19. 20 is housed in the guide hole 16 of the operating rod receiver 14, so that the operating rod 12 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 the complete floating state of the cab 24 is properly maintained.

Therefore, when the cab-over type truck 23 travels, vibrations on the chassis frame 25 side are not directly propagated to the cab 24 side, improving riding comfort.

Also, if the cab 24 is tilted,
Pressure oil from the hydraulic supply system is supplied to the hydraulic cylinder 11.
The operating rod 12 is pushed upward by the pressure oil.

When the operating rod 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 rod 12 slides into the operating rod receiver 14.
4, the cab 24 is tilted, but in response to such a tilting movement, the cab side bracket 27 is rotated, and at the same time, the cam 22 is rotated toward the operating rod receiver 14 side. Therefore, the locking member 19 is pulled back toward the operating rod receiver 14 by the return spring 21, and the locking member 19 is pulled back toward the operating rod receiver 14 by the return spring 21.
A substantially semicircular groove 20 of the member 19 projects toward the operating rod 12, and the groove 20 is fitted into the lock groove 13 of the operating rod 12 (see FIG. 3).

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

Therefore, during the tailing operation, the cab 24
Even if the center of gravity of the cab 24 moves forward beyond the center of the tail, the tailed state of the cab 24 is reliably maintained, making it possible to safely inspect and repair the internal combustion engine and various parts.

Of course, when returning from such a tilted state to a normal state, when the tilt angle of the cam 24 falls within a predetermined angle, the L-shaped portion of the locking member 19 will move back into the cam 2.
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 this invention as described above, a hydraulic cylinder is connected by a pin to the chassis frame side, a lock groove is formed at the rod end of the operating rod in the hydraulic cylinder, and a lock groove is formed at the rod end of the operating rod which is connected to the cab side bracket by a pin. A sleeve-type operating rod receptacle that can be slid back and forth, a locking member,
It consists of a return spring and a cam provided on its cab side bracket, and its locking groove is formed at the rod end of the operating rod in a direction perpendicular to the axis of the operating rod, and the operating rod receiver has a locking groove. A guide hole for the member is formed in the sleeve part in a direction perpendicular to the axis, and the cam is caused by the relative displacement between the cab side bracket and the operating rod receiver as the hydraulic cylinder is driven. , because the locking member is moved, the tailing motion of the cab is performed accurately.Moreover, even if the center of gravity of the cab moves forward beyond the center of the tilt, the tailing motion of the cab will continue. condition is reliably maintained, inspection and repair work on the internal combustion engine and various parts is safe, and furthermore, when the cab is in normal condition, the connection between the rod end of the operating rod and its cab side is virtually secure. The cab can be maintained in a floating state, and vibrations from the chassis frame side during driving are not directly propagated to the cab side, improving ride comfort.Furthermore, the operating rod The rod end of the rod is guided in a reciprocating sliding manner by the sleeve portion of the operating rod holder, and the sliding portion is protected from dust by the sleeve portion, allowing the sliding portion to smoothly reciprocate and the accompanying As a result, the durability of the sliding parts is improved, the structure is simplified, manufacturing is easier, and it is possible to avoid increasing the size.Moreover, sufficient strength can be obtained without increasing the size, and safety is improved. improved, making it extremely practical.

[Brief explanation of drawings]

Fig. 1 is a side view showing a specific example of a hydraulic cylinder device used in a tail 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 in a normal state. FIG. 3 is a partial longitudinal sectional view showing the unlocked state of the operating rod receiver and the operating rod end; FIG. 3 is a partial longitudinal sectional view showing the locked state of the operating rod receiver and the operating rod end when the cab is tilted; FIG. 4 is a cross-sectional view taken along line 4--4 in FIG. 10...Hydraulic cylinder device used in automobile tail cab, 11...Hydraulic cylinder, 1
2... Operating rod, 13... Lock groove, 14...
Operation 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)

[Scope of Claims] 1. A hydraulic cylinder whose cylinder end is pin-connected to the chassis frame; a lock groove formed in the rod end of the operating rod in the direction perpendicular to the axis of the operating rod in the hydraulic cylinder; It has a sleeve portion that accommodates the rod end of the operating rod in a reciprocating manner and is connected to the cab side bracket with a pin, and is extended at a predetermined position and in a direction perpendicular to the axis of the sleeve portion. A sleeve-type operating rod receiver equipped with a guide hole formed in the sleeve portion, and a locking rod fitted into the guide hole so that the tip can be taken in and out of the sleeve portion so that the rod can be fitted into the locking groove of the operating rod.
a return spring disposed between the sleeve-type operating rod receiver and the locking member so as to cause the tip of the locking member to protrude into the sleeve portion; When the cab is tilted, maintains the rod end of the operating rod and its operating rod receiver in an unlocked state, and maintains the rod end of the operating rod and its operating rod receiver in a locked state when the cab is tilted. As you do,
A cam that is provided on the cab side bracket and moves the locking member by a relative positional shift between the cab side bracket and the operating rod receiver as the hydraulic cylinder is driven. Hydraulic cylinder device used in automobile tail cabs.