JP2005162034A - Interference preventing mechanism at the time of tilting of cab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly prevent a front lid from coming into contact with other members of a vehicle coming close to the lid when a cab tilts with a comparatively simple structure. <P>SOLUTION: On the front surface of the cab 13, the front lid 19 is provided so as to be tip-up. A tilting pump 28 supplies and discharges pressure oil to a tilting cylinder for the cab, and is provided with a switching lever 29 for switching supplying and discharging of the pressure oil. A switching cover 46 opens/closes a switching operation hole 44a opposed to the switching lever and provided in a member 44 covering the outside surface of a chassis frame 14. A first locking means 31 locks the front lid in a closed state, and a second locking means 32 locks the switching cover in a closed state. A first lever 51 for releasing the first locking means is provided in the cab, and the second lever 52 for releasing the second locking means is provided in the front lid. A control circuit controls a motor for the pump based on a detected output by an opening/closing sensor 39 detecting the opening/closing state of the front lid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mechanism for preventing a front lid or the like from interfering with other members of a vehicle adjacent to the lid when the cab of the vehicle is tilted.

  Conventionally, a bumper cover that covers the gap between the upper flange of the front bumper and the front grille is pivotally attached to the inside of the front bumper, and a rising portion is formed at the rear edge of the bumper cover so that the bumper cover rotates downward. A front bumper cover device for a vehicle is provided in which a return spring for biasing is interposed between the bumper cover and the frame, and a lever that rotates downward in conjunction with the tilt of the cab is in contact with the lower surface of the bumper cover. It is known (see, for example, Patent Document 1).

In the vehicle front bumper cover device configured as described above, the gap between the front bumper and the front grille is closed by the bumper cover, so that the traveling wind does not enter the gap and air resistance can be reduced. Can improve the appearance. When the bumper cover is tilted, the lever is rotated downward in conjunction with the tilt, so that the bumper cover is rotated downward by the elastic force of the return spring. As a result, the bumper cover can be prevented from interfering with the front grille.
Japanese Utility Model Publication No. 64-52844 (Claim 1, Specification, Page 3, Line 20 to Page 4, Line 8)

In a truck having a tiltable cab, when the engine is moved forward in order to increase the load capacity, the cab tilt center, radiator, intercooler, or the like needs to be moved forward.
However, in the vehicle front bumper cover device disclosed in Patent Document 1, when the cab tilt center, radiator, intercooler, or the like is moved forward, the front grille contacts the bumper, radiator, or the like when the cab is tilted. There was a fear.
An object of the present invention is to provide an interference prevention mechanism at the time of cab tilt that can reliably prevent the front lid from coming into contact with other members of the vehicle adjacent to the lid when the cab is tilted with a relatively simple configuration. It is in.

  As shown in FIGS. 1, 3, 7, and 8, the invention according to claim 1 is provided with a cab 13 that is tiltably mounted on a chassis frame 14 and a jumpable front surface of the cab 13. Drives the tilt pump 28 provided with a switching lever 29 for supplying and discharging pressure oil to the front lid 19 and the tilt cylinder 26 for tilting the cab 13 and switching supply and discharge of the pressure oil. The motor 30 for the pump to be closed, the switching lid 46 for closing the switching operation hole 44a formed in the member 44 facing the switching lever 29 and covering the outer surface of the chassis frame 14, and the front lid 19 are closed. The first locking means 31 that locks in the state, the second locking means 32 that locks when the switching lid 46 is closed, and the first locking means 31 provided in the cab 13 are released. A mechanism for preventing interference at the time of cablitt, comprising a first lever 51 for the purpose and a second lever 52 provided in the front lid 19 for releasing the second locking means 32. An opening / closing sensor 39 to be detected and a control circuit 45 for controlling the pump motor 30 based on the detection output of the opening / closing sensor 39 are provided.

In the cablt interference prevention mechanism according to the first aspect of the invention, first, the first lever 51 in the cab 13 is operated to release the first lock means 31 and to jump the front lid 19 by hand. At this time, the open / close sensor 39 detects the open state of the front lid 19. Next, by operating the second lever 52 in the front lid 19, the second locking means 32 is released and the switching lid 46 is opened. Further, when a hand is inserted through the switching operation hole 44a and the switching lever 29 is operated, the control circuit 45 operates the pump motor 30 based on the detection output of the open / close sensor 39. As a result, the pump motor 30 drives the tilt pump 28, and the tilt pump 28 supplies and discharges pressure oil to and from the tilt cylinder 26, and the cab 13 tilts. At this time, since the front lid 19 is in a state of being flipped up, the front lid 19 does not contact other members of the vehicle adjacent to the lid 19.
On the other hand, when the front lid 19 is closed by operating the first lever 51 in the cab 13 to raise the front lid 19 and operating the second lever 52 in the front lid 19 to open the switching lid 46. Since the open / close sensor detects the closed state of the front rod, even if the switching lever 29 is operated, the control circuit 45 does not operate the pump motor 30 based on the detection output of the open / close sensor 39. As a result, the front lid 19 can be prevented from coming into contact with other members of the vehicle adjacent to the lid 19.
As shown in FIG. 4, the first locking means 31 includes a locked tool 33 fixed to the back surface of the front lid 19 and a front bracket 34 fixed to the cowl inner panel 13 e facing the back surface of the front lid 19. And a locking tool 36 that is pivotally attached to the front bracket 34 and that is detachably locked to the locked tool 33, and an open / close sensor 39 that faces the back surface of the front lid 19. Preferably it is attached.

  As described above, according to the present invention, the tilting pump is provided with the switching lever for switching the supply and discharge of the pressure oil to and from the tilting cylinder, and is a member that faces the switching lever and covers the outer surface of the chassis frame. The switching operation hole provided in the lid is closed so that the switching lid can be opened, a first lever for releasing the first locking means of the front lid is provided in the cab, and the second locking means of the switching lid is released. A second lever is provided in the front lid, and the control circuit controls the pump motor based on the detection output of the open / close sensor that detects the open / closed state of the front lid. After the locking means is released and the front lid is raised, the switching lever can be operated only after the second locking means is released by the second lever and the switching lid is opened. Also, after releasing the first locking means by the first lever and jumping up the front lid, the second locking means is released by the second lever and the switching lid is opened, and the front lid is closed, Since the open / close sensor detects the closed state of the front rod, even if the switching lever is operated, the control circuit does not operate the pump motor based on the detection output of the open / close sensor. As a result, since the cab cannot be tilted unless the front lid is in the raised state, it is ensured that when the cab is tilted, the front lid comes into contact with other parts of the vehicle that are close to the lid, such as a front bumper and a radiator. Can be prevented.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 7 and 8, the cab 13 of the cab over type truck 10 is mounted on the chassis frame 14 so as to be tiltable. Specifically, the lower surface of the cab 13 is placed on the pair of side members 14 a of the chassis frame 14 via the pair of first air springs 11, and the lower surface of the cab 13 is attached to the second air spring 12 and the floating bar 16. Via the side member 14a. The lower end of the cab 13 is pivotally supported at the front ends of the pair of side members 14a via hinge pins 17 so that the cab 13 can be tilted about the hinge pins 17. Further, a concave portion 13a for accommodating an engine auxiliary machine (not shown) such as a reservoir tank of engine cooling water is formed in the front portion of the cab 13 by a cowl inner panel 13e, and the front surface of the concave portion 13a is a front lid 19. (FIGS. 1, 9, and 10). The front lid 19 is attached to the cab 13 through a pair of hinges 19a, 19a (FIGS. 7, 8, and 10) so as to be able to jump up. Reference numeral 20 in FIGS. 1 and 7 to 10 is a front bumper that is attached to the front end of the chassis frame 14 and extends in the vehicle width direction along the lower edge of the front end of the cab 13.

  On the other hand, a pair of lower brackets 18 protruding upward are fixed to the front ends of the pair of side members 14a (FIGS. 7 and 8). Front ends of a pair of link levers 21 fixed to both ends of a torque tube (not shown) are fitted into upper ends of these lower brackets 18, respectively, and a pair of hinge pins 17 are inserted. A pair of cab frames 13b extending in the traveling direction of the track 10 are fixed to the bottom surface of the floor panel 13d of the cab 13, and the bottom surfaces of the pair of cab frames 13b facing the pair of link levers 21 are substantially T. A pair of letter-shaped upper brackets 22 are fixed to each other. The lower end of the upper bracket 22 is rotatably attached to the other end of the link lever 21. A pair of pins 23 are provided at the front end of the upper bracket 22 so as to extend in the vehicle width direction, and the pins 23 and the hinge pins 17 are connected by a shock absorber 24. The first air spring 11 is mounted between the upper surface of the link lever 21 and the lower surface of the front end of the upper bracket 22.

  Near the rear end of the upper bracket 22, the tip of the plunger 26a of the tilt cylinder 26 pivotally attached to the side member 14a is pivoted. An upper end of a tilt stopper 27 that can hold the cab 13 at a predetermined angle when the cab 13 is tilted is pivotally attached to the rear end of the upper bracket 22. The tilt stopper 27 is urged along the tilt cylinder 26 by a spring (not shown). A tilt pump 28 (FIGS. 1, 3, 7 and 8) for supplying and discharging pressure oil to and from the cylinder 26 is connected to the tilt cylinder 26. The tilt pump 28 is a pump motor 30. (Fig. 3). The tilt pump 28 is mounted in the vicinity of the front end of the side member 14a, and the tilt pump 28 is provided with a switching lever 29 for manually switching the supply and discharge of the pressure oil to and from the tilt cylinder 26 (FIG. 1). 7 and 8). Further, on the outer surface in the vicinity of the front end of the side member 14a, the step 43 for getting on and off the cab 13 and the side member 14a and the like are prevented from being seen from the periphery of the step 43, that is, the outer surface of the side member 14a. A covering plastic step cover 44 is attached (FIGS. 1, 9 and 10). A switching operation hole 44a is formed in the step cover 44 so as to face the switching lever 29, and the switching operation hole 44a is closed by a plastic switching lid 46 so as to be opened.

  On the other hand, between the front surface of the cowl inner panel 13e at the center of the recess 13a and the back surface of the front lid 19, first locking means 31 for locking the front lid 19 in a closed state is provided (FIGS. 1, 2, 4 and 4). FIG. 10). The first locking means 31 includes a locked tool 33 fixed to the back surface of the front lid 19, a front bracket 34 fixed to the front surface of the cowl inner panel 13 e facing the locked tool 33, and the front bracket 34. And a locking tool 36 that is pivotably attached to the locked tool 33 (FIGS. 2 and 4 to 6). The locked tool 33 is formed by bending a metal rod into a substantially U shape, and both ends thereof are welded to the inner panel 19 b of the front lid 19. Further, the front bracket 34 is formed by bending a metal plate in a substantially crank shape, and is fixedly connected to the front surface of the cowl inner panel 13e with bolts 37 and nuts 38, and connected to the lower end of the mounting portion 34a. A protrusion 34b extending forward toward the lid 19 and a holding part 34c hanging from the lower end of the protrusion 34b and holding the locking tool 36 are provided. The locking tool 36 is formed in a substantially inverted L shape, and has an upper piece 36b provided with a hook 36a at the tip, and a lower piece 36c connected to the base end of the upper piece 36b. A square hole 34d extending in the vertical direction is formed in the holding portion 34c, and a pin 34f extending in the vehicle width direction is attached to the back surface of the holder 34c below the square hole 34d via a receiving tool 34e. In the pin 34f, the substantially center of the locking tool 36 is rotatably fitted, and the upper piece 36b of the locking tool 36 is loosely fitted in the square hole 34d. The pin 34f is fitted with a torsion coil spring (not shown) that biases the locking tool 36 in the direction in which the hook 36a is locked to the locked tool 33.

  A through hole 13f is formed in the cowl inner panel 13e, and a first lever 51 for releasing the first locking means 31 is provided below the instrument panel 13c in the driver's seat (FIGS. 1 and 4 to 6). . The locking tool 36 and the first lever 51 are connected by the first cable 41 through the through hole 13d. The first cable 41 has a cylindrical outer cable 41a, one end of which is fixed to the cowl inner panel 13e so as to face the through hole 13f and the other end fixed to the lower portion of the instrument panel 13c, and the first cable 41 is slidable on the outer cable 41a. And an inner cable 41 b having one end connected to the base end of the upper piece 36 b of the locking member 36 and the other end connected to the first lever 51. A through hole 34g is formed in the holding portion 34c, and an open / close sensor 39 is attached (FIGS. 2 and 4 to 6). The open / close sensor 39 includes a case 39a attached to the back surface of the holding portion 34c, and a plunger 39b provided in the case 39a so as to be able to appear and retract. The plunger 39b is loosely inserted into the through hole 34g so as to face the back surface of the front lid 19.

  Returning to FIG. 1, the second locking means 32 is provided between the upper end of the switching lid 46 and the upper edge of the switching operation hole 44a to lock the switching lid 46 in a closed state. A second lever 52 is attached to the front surface of the cowl inner panel 13e in the recess 13a. The second lever 52 is connected to the second locking means 32 via the second cable 42, and is configured to be able to release the second locking means 32 by operating the second lever 52. The second cable 52 is composed of an outer cable and an inner cable, like the first cable 51.

  On the other hand, as shown in FIG. 3, the control circuit 45 is configured to control the tilt pump 28 based on the detection output of the open / close sensor 39. The control circuit 45 electrically connects the pump motor 30 that drives the tilt pump 28 to the battery 54 via the breaker 47, the open / close sensor 39, the stopper switch 48, the tilt operation switch 49, and the cab lock switch 53. (FIG. 3). The common contact 49 c of the tilt operation switch 49 is electrically connected to the cab lock switch 53, and the first switching contact 49 a of the tilt operation switch 49 is electrically connected to the stopper switch 48. The second switching contact 49b of the tilt operation switch 49 is electrically connected to the breaker 47 via a solenoid 56a of a spring return type two-position switching electromagnetic valve 56.

  When the front lid 19 is closed, the open / close sensor 39 is turned off when the plunger 39b is pushed into the case 39a. When the front lid 19 is opened, the plunger 19b protrudes from the case 19a by the elastic force of a spring (not shown) in the case 19a. The limit switch is turned on (FIGS. 2 to 4). The stopper switch 48 is a limit switch that is turned off when the tilt of the cab 13 is completed and turned on at other times (FIG. 3). The tilt operation switch 49 is a change-over switch linked to the change-over operation of the change-over lever 29, and the distal end of the movable piece 49d whose base end is connected to the common contact 49c is operated by the change-over lever 29 in accordance with the first change-over contact 49a or the second change-over switch. Switching to the contact 49b is possible, and when the switch lever 29 is released from the switching lever 29 to return to the neutral position, the movable piece 49d also returns to the neutral position that is not connected to any of the first and second switching contacts 49a, 49b. Configured as follows.

  The cab lock switch 53 is a change-over switch that is linked to the operation of a cab lock lever (not shown) provided on the rear surface of the cab 13, and includes a common contact 53 c that is electrically connected to the battery 54 and a tilt operation switch 49. A first switching contact 53a electrically connected to the common contact 49c, a second switching contact 53b that is electrically isolated, a base end electrically connected to the common contact 53c, and a tip the first switching contact 53a or And a movable piece 53d that can be switched to one of the second switching contacts 53b. When the cab lock switch 53 is operated to the release side, the tip of the movable piece 53d is electrically connected to the first switching contact 53a, and when the cab lock lever is operated to the lock side, the tip of the movable piece 53d is moved. It is configured to be electrically connected to the second switching contact 53b (FIG. 3). Further, when the tilt pump 28 is driven by the pump motor 30 when the solenoid 56a is not energized, the solenoid valve 56 tilts the cab 13 by projecting the plunger 26a of the tilt cylinder 26, and when the solenoid 56a is energized. When the tilt pump 28 is driven by the pump motor 30, the supply and discharge of the pressure oil to the cylinder port is switched so that the plunger 26a of the tilt cylinder 26 is retracted and the cab 13 is returned. 3 is a buzzer that sounds when the cab 13 is tilted or when the cab is returned.

  Further, a rear arch 58 formed in a substantially inverted U shape is installed on the pair of side members 14a facing the rear end of the cab 13 (FIGS. 7 and 8). A pair of rear brackets 59 are fixed to both side edges of the rear arch 58 so as to face the pair of cab frames 13b. The floating bar 16 formed in a substantially hat shape is attached to the pair of rear brackets 59 via the pair of second air springs 12. 7 and 8 is an intercooler for cooling the intake air compressed by the turbocharger, and reference numeral 62 is a radiator for cooling the engine coolant.

A procedure for tilting the cab 13 of the track 10 thus configured will be described.
First, the cab lock switch 53 provided on the rear surface of the cab 13 is operated to the release side, and the tip of the movable piece 53d of the cab lock switch 53 is electrically connected to the first switching contact 53a. Next, the first lever 51 provided in the driver's seat of the cab 13 is operated to pull the inner cable 41b of the first cable 41 in the direction of the solid line arrow in FIG. 4, and the locking tool 36 is centered on the pin 34f as shown in FIG. The hook 36a is detached from the locked tool 33 by rotating in the direction of the solid line arrow. As a result, the first locking means 31 is released, and the front lid 19 is manually raised in the direction of the solid arrow in FIG. At this time, the open / close sensor 39 detects that the front lid 19 has been flipped up and is turned on. Next, by operating a second lever 52 (FIG. 1) provided in the front lid 19, the second lock means 32 is released and the switching lid 46 is opened. Further, a hand is inserted through the switching operation hole 44a to operate the switching lever 29, and the tip of the movable piece 49d of the tilt operation switch 49 is electrically connected to the first switching contact 49a. As a result, the pump motor 30 and the buzzer 57 are energized, so that the pump motor 30 drives the tilt pump 28, the tilt pump 28 supplies and discharges pressure oil to the tilt cylinder 26, and the buzzer 57 blows. Meanwhile, the cab 13 is tilted. At this time, since the front lid 19 is in a state of being flipped up, the cab 13 can be tilted smoothly without the front lid 19 contacting the front bumper 20, the intercooler 61, the radiator 62, and the like.

On the other hand, when the front lid 19 is closed by operating the first lever 51 in the cab 13 to raise the front lid 19 and operating the second lever 52 in the front lid 19 to open the switching lid 46. Since the open / close sensor 39 detects the closed state of the front rod 19 and is turned off, the tip of the movable piece 49d of the tilt operation switch 49 is electrically connected to the first switching contact 49a by operating the switching lever 29. However, the pump motor 30 is not energized, and the pump motor 30 does not operate. As a result, since the cab 13 cannot be tilted unless the front lid 19 is lifted up, it is possible to reliably prevent the front lid 19 from contacting the front bumper 20, the radiator 62, and the like when the cab 13 is tilted.
When the tilted cab 13 is returned, the switching lever 29 is operated to electrically connect the tip of the movable piece 49d of the tilt operation switch 49 to the second switching contact 49b. As a result, the solenoid 56a, the pump motor 30 and the buzzer 57 are energized, the solenoid valve 56 is turned on, and the supply and discharge of pressure oil to and from the port of the tilt cylinder 26 is reversed. 13 returns.

Further, since the switching operation hole 44a is provided in the plastic step cover 44 and the switching operation hole 44a is closed by the plastic switching lid 46, the setting of the switching operation hole 44a and the production of the switching lid 46 are compared. And the appearance of the truck 10 is hardly impaired.
In this embodiment, the step cover is mentioned as a member covering the outer surface of the chassis frame, but a front bumper or the like may be used.

It is a side view of the cab which shows the interference prevention mechanism at the time of carburet of this invention embodiment. It is the A section expansion perspective view of FIG. It is an electric circuit diagram including an open / close sensor and a control circuit. FIG. 10 is a sectional view taken along line B-B in FIG. 9. It is sectional drawing corresponding to FIG. 4 which shows the state which the latching tool removed from the to-be-latched tool. It is sectional drawing corresponding to FIG. 4 which shows the state which started raising the front lid. It is CC sectional view taken on the line of FIG. It is sectional drawing corresponding to FIG. 7 which shows the state which the cab tilted. It is a perspective view of the cab which shows the state where the front lid was closed. It is a perspective view of the cab which shows the state which opened the front lid.

Explanation of symbols

10 Cabover truck (vehicle)
13 cab 13e cowl inner panel 14 chassis frame 19 front lid 26 cylinder for tilting 28 pump for tilting 29 switching lever 31 first locking means 32 second locking means 33 locked tool 34 front bracket 36 locking tool 39 open / close sensor 45 control Circuit 44 Step cover 44a Switching operation hole 46 Switching lid 51 First lever 52 Second lever

Claims (2)

A cab (13) mounted on the chassis frame (14) so as to be tiltable;
A front lid (19) provided on the front surface of the cab (13) so as to be jumped up;
A tilt pump (28) provided with a switching lever (29) for supplying and discharging pressure oil to and from the cylinder (26) for tilting the cab (13) and switching supply and discharge of the pressure oil;
A pump motor (30) for driving the tilt pump (28);
A switching lid (46) for closing the switching operation hole (44a) formed in the member (44) facing the switching lever (29) and covering the outer surface of the chassis frame (14);
First locking means (31) for locking the front lid (19) in a closed state;
Second locking means (32) for locking the switching lid (46) in a closed state;
A first lever (51) provided in the cab (13) for releasing the first locking means (31);
A mechanism for preventing interference at the time of cabalt, comprising a second lever (52) provided in the front lid (19) for releasing the second locking means (32),
An open / close sensor (39) for detecting an open / closed state of the front lid (19);
And a control circuit (45) for controlling the pump motor (30) based on a detection output of the open / close sensor (39). The first locking means (31) is fixed to the locked tool (33) fixed to the back surface of the front lid (19) and the cowl inner panel (13e) facing the back surface of the front lid (19). A front bracket (34), and a locking tool (36) rotatably attached to the front bracket (34) and removably locked to the locked tool (33),
The interference prevention mechanism at the time of a carburet according to claim 1, wherein an open / close sensor (39) is attached to the front bracket (34) so as to face the back surface of the front lid (19).

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