JP6726550B2 - Cab lock device - Google Patents

Description

The present invention relates to a cab lock device that locks a tiltable cab with respect to a chassis frame.

In some vehicles such as cab-over trucks, the cab can be tilted around a tilt fulcrum on the front end side in order to improve maintainability of the engine. Patent Document 1 describes a cab lock device that locks a tiltable cab with respect to a chassis frame by locking a lock pin attached to the cab. This cab lock device includes a jaw (hook) that locks a lock pin, a latch (lock lever) that holds the lock state of the lock pin by the jaw, and a hydraulic cylinder that releases the holding of the jaw by the latch. Then, the lock of the cab is released by releasing the holding of the jaw by the latch by the hydraulic cylinder.

Japanese Utility Model Publication No. 59-133376

However, in the cab lock device described in Patent Document 1, when the hydraulic cylinder malfunctions, the cab cannot be unlocked. In particular, the hydraulic system of the hydraulic cylinder is also connected to the hydraulic cylinder that lifts the cab. Therefore, there is a possibility that the hydraulic system malfunctions in a wide range of the vehicle, and the malfunction of the hydraulic system causes the hydraulic cylinder of the cab lock device to fail to unlock the cab.

Therefore, an object of the present invention is to provide a cab lock device capable of unlocking the cab even if a hydraulic cylinder malfunctions.

A cab lock device according to the present invention is a cab lock device that locks a tiltable cab with respect to a chassis frame, and includes a base plate attached to either one side of the chassis frame and the cab, and either the chassis frame or the cab. The jaws that are pivotally supported by the base plate so that they can rotate between a lock position that locks the lock pin attached to the other side and a lock release position that unlocks the lock pin, and the jaws are held in the lock position. Latches that are pivotally supported by the base plate so that they can rotate between the holding position and the holding release position that releases the jaws from the locked position, and the hydraulic pressure that is attached to the base plate and rotates the latch from the holding position to the holding release position. A cylinder and a bolt threaded portion having a bolt hole into which the bolt is screwed are formed, and the bolt hole is formed at a position where the bolt rotates the latch from the holding position to the holding release position.

In the cab lock device according to the present invention, when the bolt is screwed into the bolt hole of the bolt screwing portion, the bolt rotates the latch from the holding position to the holding release position. This releases the jaws from the locked position, which unlocks the cab. In this way, the lock of the cab can be unlocked by the mechanical means of screwing the bolt into the bolt hole. Therefore, even if a malfunction occurs in the hydraulic cylinder, the lock of the cab can be unlocked easily and reliably. Moreover, unless the bolt is intentionally rotated, the bolt is held in the bolt hole, so that the cab can be kept unlocked even after the cab is unlocked. ..

In this case, the central axis of the bolt hole may be separated from the rotation axis of the latch. In this cab lock device, since the central axis of the bolt hole is separated from the rotation axis of the latch, the latch can be easily rotated by screwing the bolt into the bolt hole.

According to the present invention, the lock of the cab can be released even if the hydraulic cylinder malfunctions.

It is a schematic diagram which shows the front part of the vehicle carrying the cab lock device. It is a schematic diagram which shows the cab suspension periphery. It is a front view which shows the lock state of a cab lock device. FIG. 4 is a vertical sectional view of the cab lock device shown in FIG. 3. It is a front view which shows the lock release state of a cab lock device. It is a front view showing the state where the lock of the cab was released by the bolt.

Hereinafter, a cab lock device according to an embodiment will be described in detail with reference to the drawings. In the following description, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

As shown in FIGS. 1 and 2, the cab lock device 1 according to the embodiment is mounted on a cab-over type truck 12 in which a cab 11 is tiltably attached about a tilt fulcrum (not shown) on the front end side. ing.

In the cab-over type truck 12, a rear cab mount member 14 is attached to a pair of chassis frames 13 extending in the vehicle front-rear direction, and a pair of suspensions 15 are provided at both ends of the rear cab mount member 14 in the vehicle width direction. A pair of cab lock devices 1 is attached. The suspension 15 is composed of, for example, a spring 15a, a shock absorber 15b, and a lateral link 15c. On the other hand, lock pins 16 that are locked to the cab lock device 1 are attached to both ends of the cab 11 in the vehicle width direction. Then, the lock pin 16 is locked to the cab lock device 1, so that the cab 11 is locked to the chassis frame 13.

As shown in FIGS. 2 to 6, the cab lock device 1 is attached to the chassis frame 13 side, and has a pair of base plates 2, a jaw 3, a latch 4, a hydraulic cylinder 5, and a bolt screwing portion 6. And are equipped with.

The pair of base plates 2 are members attached to the chassis frame 13 side. The pair of base plates 2 are indirectly attached to the chassis frame 13 via the suspension 15 and the rear cab mount member 14. The pair of base plates 2 are arranged so as to face each other with a predetermined gap therebetween, and have the same shape. A recess 21 into which the lock pin 16 is inserted is formed in the upper part of the pair of base plates 2. The recess 21 is narrowed from the upper side to the lower side, and the lock pin 16 can be guided to the lower end of the recess 21.

The jaw 3 is a member for locking the lock pin 16 at the lower end of the recess 21. The jaw 3 is inserted between the pair of base plates 2 and is rotatably supported by a rotary shaft 31 fixed to the pair of base plates 2.

The jaw 3 is rotatable about the rotation shaft 31 between a lock position where the hook portion 32 locks the lock pin 16 and a lock release position where the hook portion 32 unlocks the lock pin 16. ing. The locked position is the rotational position of the jaw 3 shown in FIG. 3, and the unlocked position is the rotational position of the jaw 3 shown in FIG.

Then, the jaw 3 is biased from the locked position toward the unlocked position by the biasing means 34. Therefore, the jaw 3 is held in the unlocked position in the natural state. As the biasing means 34, for example, a torsion spring (torsion spring) can be used. In this case, the rotating shaft 31 is inserted into the coil portion of the torsion spring so that the jaw 3 is biased from the locked position to the unlocked position, and one arm portion of the torsion spring is fixed to the pair of base plates 2. Then, the other arm of the torsion spring is locked to the jaw 3.

The jaw 3 is provided with a hook portion 32 for locking the lock pin 16, a projection portion 33 locked by the latch 4, and a lock portion 36 for rotating the jaw 3 by the lock pin 16.

The hook portion 32 is formed in a key shape (hook shape), and locks the lock pin 16 inserted in the lower end portion of the recess 21 by rotating the jaw 3 from the unlocked position to the locked position. That is, the hook portion 32 holds the lock pin 16 in the lower end portion of the recess 21 by sandwiching the lock pin 16 between the hook portion 32 and the recess 21 of the pair of base plates 2.

The protrusion 33 protrudes toward the outer side in the radial direction of rotation of the jaw 3 so as to be easily locked by the latch 4.

The lock portion 36 rotates the jaw 3 in the unlocked position to the locked position when the lock pin 16 is pressed. The lock portion 36 is largely exposed in the recess 21 when the jaw 3 is in the unlocked position. Then, when the cab 11 is lowered in this state and the lock pin 16 is inserted into the recess 21, the lock portion 36 is pressed against the lock pin 16 to rotate the jaw 3 from the unlocked position to the locked position. When the jaw 3 is in the lock position, the lock portion 36 may not be exposed in the recess 21, but may be exposed in the recess 21 as long as the locking of the lock pin 16 is not hindered. Good.

The latch 4 is a member for holding the jaw 3 in the lock position. The latch 4 is inserted between the pair of base plates 2 and is rotatably supported by a rotary shaft 41 fixed to the pair of base plates 2.

The latch 4 is rotatable about the rotation shaft 41 between a holding position for holding the jaw 3 in the lock position and a holding release position for releasing the jaw 3 from the lock position. The holding position is the rotational position of the latch 4 shown in FIG. 3, and the holding release position is the rotational position of the latch 4 shown in FIG.

It should be noted that the latch 4 is provided with a biasing means (not shown) for biasing the latch 4 from the holding release position to the holding position so that the latch 4 is located at the holding position when the jaw 3 is located at the locking position. Interlocking means (not shown) for rotating the latch 4 from the holding release position to the holding position in association with the rotation from the lock release position to the lock position is attached.

The latch 4 includes a locking portion 42 that locks the projection 33, a first projection 43 that is pressed against the hydraulic cylinder 5, and a second projection 44 that is pressed by a bolt described below.

The locking portion 42 holds the jaw 3 in the locked position by locking the protrusion 33. That is, the locking portion 42 prevents the jaw 3 from rotating from the locked position to the unlocked position (so as not to rotate in the clockwise direction in FIG. 3) when the latch 4 is in the holding position. Lock. At this time, the protrusion 33 and the locking portion 42 are in contact with each other. Then, the locking portion 42 unlocks the projection 33 by rotating the latch 4 from the holding position to the holding release position.

The first protrusion 43 is pressed against the hydraulic cylinder 5 to rotate the latch 4 from the holding position to the holding release position. The first protrusion 43 protrudes outward in the radial direction of rotation of the latch 4 so that the first protrusion 43 is easily pressed against the hydraulic cylinder 5. As shown in FIG. 3, when the hydraulic cylinder 5 is not operating, the first projection 43 abuts on the hydraulic cylinder 5 so that the latch 4 located at the holding position is at the holding release position. Restrict rotation to the opposite side (counterclockwise rotation in FIG. 3).

As will be described later, the bolt 7 is screwed into the bolt screwing portion 6. The second protrusion 44 is pressed against the bolt 7 screwed into the bolt screwing portion 6 to rotate the latch 4 from the holding position to the holding release position. The second protrusion 44 protrudes outward in the radial direction of rotation of the latch 4 so that the second protrusion 44 is easily pressed against the bolt 7.

The hydraulic cylinder 5 is a member attached to the pair of base plates 2 for rotating the latch 4 from the holding position to the holding release position. The hydraulic cylinder 5 includes a cylinder portion 51 that is inserted between the pair of base plates 2 and is fixed to the pair of base plates 2, and a rod portion 52 that is expandable/contractible with respect to the cylinder portion 51. A hydraulic passage (not shown) is connected to the hydraulic cylinder 5, and the rod portion 52 is expanded and contracted with respect to the cylinder portion 51 by the hydraulic pressure sent from this hydraulic passage. This hydraulic path is also connected to a hydraulic cylinder (not shown) that lifts the cab 11.

Then, in the hydraulic cylinder 5, the rod portion 52 is extended with respect to the cylinder portion 51, and the tip of the rod portion 52 is pressed against the first protrusion 43, thereby rotating the latch 4 from the holding position to the holding release position. That is, the hydraulic cylinder 5 presses the rod portion 52 against the first protrusion 43 so that the latch 4 rotates from the holding position to the holding release position (rotates in the clockwise direction in FIG. 3 ).

The bolt screwing portion 6 is formed with a bolt hole 61 into which the bolt 7 is screwed. By pressing the bolt 7 screwed into the bolt hole 61 against the second protrusion 44, the latch 4 is moved from the holding position to the holding release position. It is a member for rotating. Since it is difficult to secure a sufficient space above and below the vehicle lock device 1 in the vehicle vertical direction and on both sides in the vehicle width direction, the bolt screwing portion 6 should be arranged below the latch 4 in the vehicle vertical direction. Is preferred. The bolt screwing portion 6 extends in the axial direction of the rotating shaft 41 (the direction in which the pair of base plates 2 face each other), and both ends thereof are fixed to the pair of base plates 2. The bolt screwing portion 6 may be separate from the pair of base plates 2 or may be integral with the pair of base plates 2.

A female screw corresponding to the male screw of the bolt 7 is engraved in the bolt hole 61. Since many M8 bolts are used in trucks, it is preferable that the bolt holes 61 have bolt inner diameters corresponding to the outer diameters of bolts often used in trucks.

The bolt hole 61 is formed at a position where the latch 4 can be rotated from the holding position to the holding release position by pressing the bolt 7 screwed into the bolt hole 61 against the second protrusion 44 of the latch 4. ing. That is, in the bolt hole 61, the bolt 7 screwed into the bolt hole 61 has the second protruding portion 44 so that the latch 4 rotates from the holding position to the holding release position (clockwise in FIG. 3 ). It is formed in a position where can be pressed. Further, in order to facilitate the rotation of the latch 4 by screwing the bolt 7 into the bolt hole 61, the center axis A of the bolt hole 61 is separated from the rotation axis of the latch 4.

Next, the operation of the cab lock device 1 will be described.

The operation of locking the unlocked cab 11 will be described with reference to FIGS. 3 to 5. With the jaw 3 in the unlocked position and the latch 4 in the holding released position (see FIG. 5), the cab 11 is lowered. Then, the lock pin 16 is inserted into the concave portion 21, and the lock pin 16 is pressed against the lock portion 36, whereby the jaw 3 in the unlocked position is rotated to the lock position. The hook portion 32 locks the lock pin 16 so that the cab 11 is locked (see FIG. 4 ). At this time, the latch 4 rotates to the holding position and the locking portion 42 locks the protrusion 33, whereby the jaw 3 is held at the locking position.

An operation of unlocking the locked cab 11 will be described with reference to FIGS. 3 to 5. With the jaw 3 in the locked position and the latch 4 in the holding position (see FIG. 3), the hydraulic cylinder 5 is operated. Then, the rod portion 52 is pressed against the first protruding portion 43, whereby the latch 4 rotates from the holding position to the holding release position, and the locking of the protruding portion 33 by the locking portion 42 is released. Then, the jaw 3 is rotated from the locked position to the unlocked position, and the locking of the lock pin 16 by the hook portion 32 is released, whereby the cab 11 is unlocked (see FIG. 5 ). At this time, the jaw 3 is held in the holding release position by being biased by the biasing means 34.

An operation of unlocking the locked cab 11 when a failure occurs in the hydraulic cylinder 5 will be described with reference to FIGS. 3, 4, and 6. With the jaw 3 in the lock position and the latch 4 in the holding position (see FIG. 3 ), the bolt 7 is screwed into the bolt hole 61 of the bolt screwing portion 6. Then, when the bolt 7 is pressed against the second protrusion 44, the latch 4 rotates from the holding position to the holding release position, and the locking of the projection 33 by the locking portion 42 is released. Then, the jaw 3 is rotated from the locked position to the unlocked position, and the locking of the lock pin 16 by the hook portion 32 is released, whereby the cab 11 is unlocked (see FIG. 6 ). At this time, since the bolt 7 is held in the screw hole 61 in a screwed state, the jaw 3 is held in the unlocked position.

As described above, in the cab lock device 1 according to the present embodiment, when the bolt 7 is screwed into the bolt hole 61 of the bolt screwing portion 6, the bolt 7 rotates the latch 4 from the holding position to the holding release position. As a result, the jaw 3 is released from the lock position, so that the lock of the cab 11 is released. In this way, the lock of the cab 11 can be released by a mechanical means of screwing the bolt 7 into the bolt hole 61. Therefore, even if a problem occurs in the hydraulic cylinder 5, the lock of the cab 11 can be released easily and reliably. it can. Moreover, unless the bolt 7 is intentionally rotated, the bolt 7 is held in a state of being screwed into the bolt hole 61. Therefore, even after the cab 11 is unlocked, the cab 11 remains unlocked. Can be held.

Further, since the central axis A of the bolt hole 61 is separated from the rotation axis of the latch 4, the latch 4 can be easily rotated by screwing the bolt 7 into the bolt hole 61.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and is modified without departing from the scope of the claims and applied to other things. May be.

For example, in the above-described embodiment, the second protrusion 44 is described as protruding toward the outer side in the radial direction of rotation of the latch 4 in order to be easily pressed against the bolt 7, but the bolt 7 is used as the second protrusion. The second protrusion 44 may protrude in another direction as long as the second protrusion 44 can be pressed against the protrusion 44. For example, the second protrusion 44 may protrude in the axial direction of the rotating shaft 41 (the direction in which the pair of base plates 2 face each other).

Further, in the above embodiment, the cab lock device 1 is attached to the chassis frame 13 side, and the lock pin 16 is attached to the cab 11 side, but the lock pin 16 is attached to the chassis frame 13 side. The cab lock device 1 may be attached to the side.

DESCRIPTION OF SYMBOLS 1... Cab lock device, 2... Base plate, 3... Jaw, 4... Latch, 5... Hydraulic cylinder, 6... Bolt screwing part, 7... Bolt, 11... Cab, 12... Cab over track, 13... Chassis frame, 14... Rear cab mount member, 15... Suspension, 15a... Spring, 15b... Shock absorber, 15c... Lateral link, 16... Lock pin, 21... Recessed part, 31... Rotating shaft, 32... Hook part, 33... Projection part, 34 ... biasing means, 35... locking shaft, 36... locking part, 41... rotating shaft, 42... locking part, 43... first projection part, 44... second projection part, 51... cylinder part, 52... rod part , 61... Bolt hole, A... Central axis.

Claims (2)

A cab lock device for locking a tiltable cab to a chassis frame,
A base plate attached to either one of the chassis frame and the cab;
It is pivotally supported by the base plate so as to be rotatable between a lock position for locking a lock pin attached to the other side of the chassis frame and the cab and a lock release position for unlocking the lock pin. With Joe
A latch pivotally supported on the base plate so as to be rotatable between a holding position for holding the jaw in the locked position and a holding release position for releasing the jaw from the locked position,
A hydraulic cylinder attached to the base plate for rotating the latch from the holding position to the holding release position;
A bolt screwing portion in which a bolt hole into which the bolt is screwed is formed,
The bolt hole is formed at a position where the bolt screwed into the bolt hole is pressed against the latch to rotate the latch from the holding position to the holding release position.
Cab lock device. The central axis of the bolt hole is separated from the rotation axis of the latch,
The cab lock device according to claim 1.

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