JP2533798B2 - Stopper mechanism used in electric cab tilt device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a stopper mechanism used in an electric cab tilt device of a tilt cab type automobile.

BACKGROUND ART In an electric cab tilt device used in this type of tilt / cab type automobile, a stopper mechanism is provided in consideration of a case where the drive system fails during the tilt of the cab, and the cab is rapidly moved. Has stopped the descent.

However, does the stopper mechanism consist of a large cam / gear, a small cam / gear, and a pin / lever?
Also, since it is composed of the Geneva gear mechanism, it was very difficult to manufacture. Especially in the former case, the structure became complicated.

An object of the present invention is to simplify a structure and
An electric cab that facilitates installation in the tilt device and locks the cab-tilt device in the extended state even when the drive system fails in the middle of tilting the cab, and prevents the cab from descending. -To provide a stopper mechanism used for tilting devices.

SUMMARY OF THE INVENTION AND CONTENTS OF CLAIMED INVENTION ACCORDING TO THE PROBLEM In relation to the above-mentioned problems, the stopper mechanism used in the electric cab tilt device of the present invention is a ball screw shaft of an electric cab tilt device. A plate that is fixedly supported on the plate, a gear part at the root part, an inclined surface and a rotation stop surface at the tip part, respectively, and a projection position on the plate surface of the plate located near the outer periphery of the plate. A pawl that is rotatably supported in the retracted position, is engaged with the gear portion of the pawl and is playably coupled to the ball screw shaft rotatably within a predetermined range, and the electric cab is・ A pawl drive gear that meshes with the gear on the electric motor side of the tilt device, and it is ejected so that it can be put in and out of the protruding position. , And when the cab is tilted, it is retracted by its pawl drive gear into its projecting position by its inclined surface of its pawl, and when the cab is lowered under its own weight, its propulsion gear A stop that locks the electrically operated cab-tilt device against the detent surface of the pawl that is projected into position, and the cab-tilt device is included during the tilting or lowering of the cab. When the cab fails and the cab begins to descend under its own weight, the ball-screw shaft is reversed and its pawl is pushed into its protruding position by its pawl drive gear which is play-coupled to the ball-screw shaft. Hooked on the stopper, and put the electric cab tilt device in the middle -Clicking.

Description of Specific Examples Specific examples of the stopper mechanism used in the electric cab tilt device according to the present invention will be described with reference to the drawings.

1 to 4 show a tenth embodiment of the stopper mechanism of the present invention applied to an electric cab tilt device 40 of a tilt / cab type truck.

The stopper mechanism 10 is incorporated in a gear housing 41 of the electric cab tilt device 40, and a plate 11 fixedly supported by a ball screw shaft 43 of the electric cab tilt device 40. And the gear parts 23, 23 at the root part, the inclined surfaces 31, 31 and the rotation stopping surfaces 32, 32 at the tip part, respectively, and the plate surface 20 of the plate 11 is located near the outer periphery of the plate 11. A pair of pawls 12, 12 rotatably supported in a protruding position and a retracted position, and its ball screw, which is engaged with its gear portions 23, 23 of the pawls 12, 12.
The pawl drive gear 13 is play-coupled to the shaft 43 so as to be relatively rotatable within a predetermined range, and is engaged with the intermediate gear 54 on the electric motor 47 side of the electric cab tilting device 40, and the pawl drive gear 13 is put in and out of the protruding position. The pawl that is ejected as far as possible, and when the cab is tilted, is ejected to its ejected position by its pawl drive gear 13.
The detent surface 32 of the pawl 12,12 which is retracted by the inclined surface 31,12 of the pawl 12,12 and which is ejected to its protruding position by the pawl drive gear 13 when the cab is lowered by its own weight. , 32, and a stopper 14 for locking the electric cab tilt device 40.

The plate 11 is made into a disc plate and is keyed to the lower end of the ball screw shaft 43.

The pawls 12 and 12 have their gear portions 23 and 23 machined into the bosses 22 and 22 that are the root portions thereof, and the inclined surfaces 31 and 31 and the rotation stopping surfaces 32 and 32 are formed at their tip portions. Made in place, and its disc plate 11
The bosses 22, 22 are rotatably supported by the support pins 21, 21 located near the outer periphery of the plate surface 20 and projected to the plate surface 20, and the plate surface 20 is rotated between the protruding position and the retracted position. . In particular, in the pawls 12 and 12, the rotation stopping surfaces 32 and 32 are formed as vertical surfaces.

The pawl drive gear 13 has a play groove 24 formed in the boss, and the key 25 of the ball screw shaft 43 is fitted into the play groove 24 so that the ball screw
The shaft 43 is rotatably coupled within a predetermined range. Of course, the range of relative rotation is
It is aligned with the rotation of its protruding and retracted positions of 2.

The stopper 14 is provided with a rod 27 that can be fitted in and out of the hole 26 of the gear housing 41, and the hole 26 thereof.
The bottom end of the rod 27 is fitted into the bottom of the
The coil spring 28 protrudes to the outside of the rod 26, and the roller 29 rotatably supported by the pin 30 at the tip of the rod 27 so that the tip of the rod 27 can make rolling contact.

Further, in the electric cab tilt device 40 using the stopper mechanism 10, 42 is a pipe housing, 44 is a telescope pipe, and 45 is a chassis side end.
Joint, 46 cab side end joint, 47 electric motor, 48 motor shaft, 49 motor shaft, 50 bearing, 51 small gear, 52 intermediate shaft,
53 is a large gear, 54 is an intermediate gear, 55, 56 and 57 are bearings, and 58 is a brake.

Next, to explain the operation of the stopper mechanism 10 described above, when the electric motor 47 is driven to tilt the cab of the truck, the electric motor 47 is driven.
Since the power of 47 is transmitted to the pawl drive gear 13 via the small gear 51, the large gear 53, and the intermediate gear 54, the intermediate gear
54 and the pawl drive gear 13 are rotated in the direction of arrow A in FIG. 4, and the pawl drive gear 13 is moved to its ball screw shaft 43 until one side wall of its play groove 24 hits its key 25. It is rotated relative to
Rotate 12,12 around its strut pins 21,21 to its protruding position.

As such, its pawl 12,12 is extruded and its pawl 1
Since the inclined surfaces 31 of 2, 2 can be rotated in the direction in which they face the stopper 14, their pawls 12, 12 are
4 rotates on its inclined surface 31 against its spring 28 and rotates, and its pawl drive gear 13 continues to rotate without being caught by its stopper 14, and accordingly, its ball
The screw shaft 43 is rotated, the telescope pipe 44 is brought out of the pipe housing 42 by the ball screw shaft 43, and the cab is tilted.

Thus, if a failure occurs in the electric circuit of the electric motor 47 while the cab is being tilted, the ball screw shaft 43, the pawl drive gear 13, and the intermediate gear 54 will move to the fourth position due to the weight of the cab. When the disc plate 11 is rotated in the directions of the arrows B and A in the figure, and the disc plate 11 is rotated together with the ball screw shaft 43, the vertical plane 3 of one of the pawls 12, 12 is rotated.
2 hits the stopper 14, the ball screw shaft 43 is prevented from rotating, the cab tilt device 40 is locked, and the cab is held in the midway of tilting.

Further, when the electric motor 47 is driven in the opposite direction in order to lower the cab from the tilted position, the power of the electric motor 47 passes through the small gear 51, the large gear 53, and the intermediate gear 54, Since the pawl drive gear 13 is transmitted to the pawl drive gear 13, the pawl drive gear 13 is rotated in the direction opposite to the arrow A direction in FIG. 4, that is, in the arrow C direction in FIG. Is rotated in the opposite direction relative to its ball-screw shaft 43 until its other side wall hits its key 25, and its pawl 12,12 is in its retracted position around its strut pin 21,21. Rotate in the opposite direction.

As such, the pawl drive gear 13 continues to rotate in the opposite direction because the pawls 12, 12 are retracted and not hooked to the stopper 14, and accordingly, the ball screw shaft 43 is also reversed. Is rotated in the direction
The telescope pipe 44 is then retracted inside the pipe housing 42 by the ball screw shaft 43 and the cab is lowered.

As such, if a failure occurs in the electric circuit of the electric motor 47 while the cab is being lowered, the ball screw shaft due to the weight of the cab.
43, the pawl drive gear 13, and the intermediate gear 54 are rotated in the directions of arrows B and A in FIG. 4, the pawls 12,12 are rotated about their strut pins 21,21 in their projecting position, and When the disc plate 11 is rotated along with its ball screw shaft 43, its pawl 1
One of the vertical surfaces 32 of the two 12, 12 hits its stopper 14, its ball screw shaft 43 is detented, its cab tilt device 40 is locked, and its cab is kept in the middle of descent. To be done.

As is apparent from the specific embodiments of the present invention described above with reference to the drawings, those skilled in the art to which the present invention pertains have ordinary knowledge in that It is readily embodied in another embodiment that derives from the nature and substance of the invention and is objectively admitted to incorporate them. Of course, the subject matter of the present invention is commensurate with the subject of the invention and is essential for the establishment of the invention.

Benefits of the Invention As will be understood from the above, the stopper mechanism used in the electric cab tilt device of the present invention includes a plate fixedly supported by the ball screw shaft of the electric cab tilt device, The root portion is provided with a gear portion, and the tip portion is provided with an inclined surface and an anti-rotation surface, respectively, and is positioned near the outer periphery of the plate and rotatably supported on the plate surface of the plate in a protruding position and a retracted position. The pawl is engaged with the gear portion of the pawl and is play-coupled to the ball screw shaft so as to be relatively rotatable within a predetermined range, and is attached to the gear on the electric motor side of the electric cab tilt device. The pawl drive gear that is meshed with it, and the cab is tilted so that it can be pushed into and out of the protruding position. When the cab is lowered by its claw driving gear, it is retracted by the inclined surface of the pawl, and when the cab is lowered by its own weight, the pawl is protruded by the driving gear to the protruding position. The stopper mechanism used in the electric cab tilt device according to the present invention includes a stopper that locks the electric cab tilt device by hitting its anti-rotation surface.
The structure is simple and the number of parts is small, so that it can be easily incorporated into an electric cab tilt device, and when the cab is in the middle of tilting or lowering, the electric cab tilt device is a drive system, for example, electric. When the system fails and the cab begins to descent under its own weight, the ball screw shaft is reversed and its pawl projects into its ejected position with its pawl drive gear that is play-coupled to the ball screw shaft. The electric cab tilting device is locked in the middle of the operation, and the cab is prevented from being lowered, and the safety of the work is ensured. -Very useful and practical for tilt devices.

[Brief description of drawings]

FIG. 1 shows a tilt / tilt assembly incorporating a specific example of a stopper mechanism used in the electric cab / tilt device of the present invention.
FIG. 2 is a vertical sectional view showing an electric cab tilting device applied to a cab type truck, FIG. 2 is an enlarged view of the stopper mechanism shown in FIG. 1, and FIG. FIG. 1 is a plan view of the stopper mechanism shown in FIG. 1, and FIG. 4 is a plan view of the stopper mechanism shown in FIG. 1 when a failure occurs. 11 …… Plate, 12, 12 …… Claw, 13 …… Claw drive gear, 14 …… Stopper.

Claims (1)

(57) [Claims] 1. A plate (11) fixedly supported by a ball screw shaft (43) of an electric cab tilting device (40), a gear part (23) at a root part and an inclination at a tip part. Surface (31)
And a rotation stopping surface (32), respectively, and is positioned near the outer periphery of the plate (11) and rotatably supported by the plate surface (20) of the plate (11) at the protruding position and the retracted position. The pawl (12) and the gear portion (23) of the pawl (12) are engaged with the ball screw shaft (43) so as to be rotatable relative to each other within a predetermined range, and are electrically driven. Drive gear (13) meshed with the gear (54) on the electric motor (47) side of the model cab tilting device (40)
And its pawl (1) which is ejected so that it can be moved into and out of the protruding position, and when the cab is tilted, the pawl drive gear (13) protrudes into the protruding position (1).
2) When the cab is retracted by its inclined surface (31) and the cab is lowered by its own weight, its pawl drive gear (13)
An electric cab tilt device including a stopper (14) that locks the electric cab tilt device (40) by hitting the anti-rotation surface (32) of the pawl (12) that is projected to the protruding position by the Stopper mechanism used for.