JP4808528B2 - Cab mounting device - Google Patents

Description

  The present invention relates to a floating type cab mounting device using a leaf spring.

Conventionally, a frame structure is often used in a cab-over truck, and a power unit including an engine is supported on a chassis frame by an engine mount and the cab is supported on the chassis frame by a cab mount.
The cab over type truck has a fixed type that completely fixes the cab to the chassis frame, and a tilt type cab over type cab that can tilt the entire cab around the front support part during engine maintenance. As these mounting methods, those using vibration-proof rubber as disclosed in Patent Document 1 have been widely used.

On the other hand, for the purpose of improving riding comfort, a floating type cab mounting device having a suspension mechanism combined with a shock absorber, a leaf spring, or the like has been used in large vehicles.
11 shows a view of the cab tilt mechanism shown in FIG. 10 as viewed in the X direction. In FIGS. 10 and 11, reference numeral 1 denotes a front U-shape that is bolted between the left and right side members 5 of the chassis frame 3. A shock absorber 9 is pivotally attached to a support bracket 7 fixed to both sides of the cab mounting bracket so as to be swingable in the direction of the arrow. And the upper end side of each shock absorber 9 is connected to the left and right end portions of the floating bar 11 that supports the cab, and a pair of V-shaped front views is arranged on the upper portions of the left and right end portions of the floating bar 11. A cab mounting portion 15 made of the anti-vibration rubber 13 is provided.

As shown in FIG. 11, between the cab mounting bracket 1 and the floating bar 11, plate-like leaf springs 17 having both sides curved in a C shape are interposed. The free end 17a side is bolted onto the cab mounting bracket 1.
On the other hand, a spacer 19 made of a square steel pipe is fixed inside the center of the floating bar 11 having a U-shaped cross section as shown in FIG. 12, and the leaf spring 17 is connected to the floating bar via the spacer 19. 11 and a bolt 21 and a nut 23, and a lock pin 25 is simultaneously fixed on the floating bar 11 with a bolt 21 and a nut 23 via a spacer 19.

As shown in FIG. 10, the chassis frame 3 on the front side of the cab mounting bracket 1 is provided with a hinge mechanism 27 for tilting the cab, and the cab is a cab main member 29 connected to the hinge mechanism 27. And the rear portion of the cab is tilt-locked to the lock pin 25 by a tilt lock 31 shown in FIG. 11, and the cab that is tilt-locked in this way is mounted on the cab mounting. The unit 15 is mounted.
JP 2004-291895 A

  However, the above-described floating type cab mounting device 33 has a structure in which the leaf spring 17 is directly fixed to the cab mounting bracket 1 on the chassis frame 3 side and the floating bar 11 on the cab side with the bolts 21. As shown by the arrow in FIG. 11, the fine vibration in the high frequency region generated from the installed power unit, transmission, etc. is easily transmitted to the cab, and when the fine vibration is transmitted to the cab, the cab resonates. There was a possibility that a muffled sound would occur in the cab.

  The present invention has been devised in view of such circumstances, and it is intended to provide a floating type cab mounting device that blocks transmission of fine vibrations from the chassis frame side to the cab side to prevent the generation of a booming noise. Objective.

To achieve such object, the invention according to claim 1, on the cab mounting bracket fixed to the chassis frame, Te at a floating bar supporting the cab cab mounting device arranged through the leaf spring, the leaf An upper seat plate in which a bolt insertion hole is formed in a spring, the floating bar, and a lock pin disposed on the floating bar, and a floating bar mounting bolt that is inserted through the bolt insertion hole is attached to the floating bar and a leaf spring. A rubber cushion having a rubber member adhered between the bolt and the lower seat plate to which the leaf spring mounting bolt that is inserted through the bolt insertion hole is attached, the floating bar mounting bolt, the nut to be attached thereto, and the leaf spring mounting Bolts for While fixed with a nut which attach to Les, the locking pin, characterized in that the said floating solid wear floating bar bar mounting bolts and nuts which attach thereto.
The invention according to claim 2 is characterized in that, in the cab mounting device according to claim 1, a rebound stopper is provided on the floating bar so as to go around the lower side of the leaf spring and cover the vibration absorbing member. And

The invention according to claim 3, on the cab mounting bracket fixed to the chassis frame, a floating bar supporting the cab At a cab mounting device arranged via a leaf spring, said floating bars and on the floating bar A plurality of bolt insertion holes are formed coaxially on the lock pin disposed on the lock pin , a nut insertion hole is formed on the lock pin coaxially with the bolt insertion hole of the floating bar, and the bolt insertion of the floating bar is inserted into the leaf spring. A rubber cushion mounting bolt that is inserted through the hole and the nut insertion hole of the lock pin is attached, and the lock pin mounting bolt that is inserted through the bolt insertion hole of the floating bar and the lock pin is inserted into both ends of the floating bar. Plate and the seat plate, A rubber cushion formed of a rubber member having an insertion hole formed therein is inserted into the boss insertion hole from below, and a cylindrical boss is attached to a seat plate through a spacer. The rubber cushion mounting bolt that is inserted through the nut insertion hole and the nut that is fixed to the rubber cushion mounting bolt within the nut insertion hole, and the lock that is inserted through the bolt insertion hole provided in the floating bar and the lock pin The lock pin is fixed to the rubber cushion by being separated from the floating bar by a pin mounting bolt and a nut attached thereto.
Furthermore, the invention according to claim 4 is the cab mounting device according to claim 3, wherein two rubber members are arranged in parallel between the lock pin mounting bolts.

According to the first aspect of the present invention, since the rubber cushion is mounted between the floating bar and the leaf spring, the fine vibration in the high frequency region generated from the power unit, transmission, etc. mounted on the chassis frame is transmitted to the leaf spring. Even if this is the case, the rubber cushion absorbs the minute vibrations and blocks the transmission of the minute vibrations from the floating bar to the cab. As a result, there is an advantage that no muffled noise is generated in the cab.

According to the second aspect of the present invention, the rebound stopper fixed to the floating bar prevents the cab (floating bar) from being lifted up even if the rubber cushion is damaged due to long-term use. It has the advantage of ensuring safety during traveling.
On the other hand, according to the invention according to claim 3 , the rubber cushion is mounted between the floating bar and the leaf spring, and the lock pin is separated from the floating bar and fixed to the rubber cushion. Even if the fine vibration in the high frequency range is transmitted to the leaf spring, the rubber cushion absorbs this fine vibration, and of course the fine vibration is directly transmitted from the floating bar to the cab due to the structure where the lock pin and the floating bar are separated. As a result, there is an advantage that transmission of micro vibrations to the cab can be more reliably prevented.
And according to the invention which concerns on Claim 4, it has the advantage which can aim at the reduction of the cost concerning a rubber member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, the same thing as the prior art example shown in FIG.
Figure 1 shows one embodiment of a cab mounting system according to claims 1 and 2, in the figure, 35 is a Rabakussho down the sandwiched engagement portion of the leaf spring 17 and the floating bar 11, FIG. 1 and FIG. As shown in FIG. 2, in this embodiment, instead of the spacer 19 of FIG. 12, a rubber cushion 35 is mounted between the leaf spring 17 and the floating bar 11, and the minute vibration transmitted from the chassis frame side to the cab side is reduced. It is absorbed and blocked by the rubber cushion 35.

  3 is an overall perspective view of the rubber cushion 35, and FIG. 4 is a front view of the rubber cushion 35. In FIG. 3, reference numeral 37 denotes a left and right end of a single metal plate cut into a strip shape. The upper seat plate 41 is provided with a stopper piece 39, and the left and right ends of a single metal plate cut into a strip shape shorter than the upper seat plate 37 are folded upward in an L shape. The lower seat 41 is bent and provided with a stopper piece 43. The lower seat 41 is disposed opposite to the upper seat 37, and both seats 37 and 41 are placed in the floating bar 11 having a U-shaped cross section. It is formed with the same width that can be mounted.

A hard rubber (rubber member) 45 is attached between the upper seat plate 37 and the lower seat plate 41.
As shown in FIG. 4, the hard rubber 45 is formed in a block shape from the left and right stopper pieces 43 of the lower seat plate 41 to the inner surface of the upper seat plate 41, and the lower seat plate 41 between the left and right stopper pieces 43 is formed. It is bonded to the inner surface and the inner surface of the upper seat plate 41, and thus the hard rubber 45 is interposed between the upper seat plate 37 and the lower seat plate 41, so that the gap between the stopper piece 43 and the upper seat plate 37. A predetermined gap 47 is secured. And even if the hard rubber 45 is crushed by the weight of the cab, the stopper piece 43 is set so as not to contact the upper seat plate 37.

Further, the stopper pieces 39 and 43 of the upper seat plate 37 and the lower seat plate 41 are brought into contact with each other when the hard rubber 45 is deformed by the cab roll, thereby preventing the hard rubber 45 from being deformed more than a predetermined amount. However, the hard rubber 49 is also bonded to the inner surface of the stopper piece 39 of the upper seat plate 37 to prevent the metal stopper pieces 39 and 43 from directly colliding with each other.
Then, as shown in FIGS. 2 to 4, the upper seat plate 37 of the rubber cushion 35 is inserted through two bolt insertion holes 51 and 53 respectively drilled in the upper surface (web) of the floating bar 11 and the bottom of the lock pin 25. The two floating bar mounting bolts 55 are welded, and the two leaf spring mounting bolts 59 that pass through the two bolt insertion holes 57 provided on the leaf spring 17 side are floated on the lower seat plate 41. It is welded coaxially with the bar mounting bolt 55.

In FIG. 1, reference numeral 61 denotes a rebound stopper for preventing the cab from being lifted when the rubber cushion 35 is damaged. As shown in FIGS. 5 and 6, the rebound stopper 61 has side walls 63 and 65 which are opposed to each other. It is formed in a U-shaped cross section.
As shown in FIG. 2, the rebound stopper 61 is formed so that the leaf spring 17 can be accommodated in the side walls 63 and 65 because the rebound stopper 61 goes around the lower side of the leaf spring 17 and is fixed to the floating bar 11.

As shown in FIGS. 5 and 6, the side walls 63 and 65 are respectively provided with bolt insertion holes 69 and 71 corresponding to the two bolt mounting holes 67 formed on the side surface (giving) of the floating bar 11. In addition, a nut insertion hole 77 through which a nut 75 screwed to the leaf spring mounting bolt 59 is inserted is provided at the bottom 73 of the rebound stopper 61.
The rubber cushion 35 and the rebound stopper 61 of the present embodiment are configured in this way. Next, a method of connecting the leaf spring 17 and the floating bar 11 using them will be described. The leaf spring 17 is connected to the floating bar 11. First, as shown in FIG. 1, two leaf spring mounting bolts 59 welded to the lower seat plate 41 of the rubber cushion 35 from above the leaf spring 17 are inserted into two bolt insertion holes 57 on the leaf spring 17 side. The lower seat plate 41 is abutted and disposed on the leaf spring 17.

As shown in FIG. 2, a nut 75 is screwed onto the leaf spring mounting bolt 59 to fix the rubber cushion 35 on the leaf spring 17.
Next, as shown in FIG. 2, after the two floating bar mounting bolts 55 welded to the upper seat plate 37 of the rubber cushion 35 are inserted into the bolt insertion holes 51 and 53 on the floating bar 11 and the lock pin 25 side. While the nut 75 is inserted into the nut insertion hole 77, the rebound stopper 61 is wound around the lower side of the leaf spring 17, and the rubber cushion 35 is covered with the side walls 63, 65 and provided on the side surface of the floating bar 11. Bolt insertion holes 69 and 71 provided in the side walls 63 and 65 of the rebound stopper 61 are positioned in the two bolt mounting holes 67.

Thereafter, the rubber cushion 35 is sandwiched and attached to the fastening portion of the leaf spring 17 with the floating bar 11 by attaching the bolt to the bolt attachment hole 67 from the bolt insertion holes 69 and 71.
Since the cab mounting device 79 according to the present embodiment is configured as described above, even if fine vibration in a high frequency region generated from a power unit, a transmission, or the like mounted on the chassis frame 3 is transmitted to the leaf spring 17, the rubber The cushion 35 (hard rubber 45) absorbs this minute vibration and blocks transmission of the minute vibration from the floating bar 11 to the cab.

Further, when the hard rubber 45 is deformed by the roll of the cab, the stopper pieces 39 and 43 come into contact with each other to prevent the hard rubber 45 from being deformed more than a predetermined amount. At this time, the hard rubber bonded to the inner surface of the stopper piece 39 49 prevents the metal stopper pieces 39 and 43 from directly colliding with each other.
And even if the rubber cushion 35 (hard rubber 45) is damaged due to long-term use, the side walls 63 and 65 are fixed to the floating bar 11 by going around the lower side of the leaf spring 17 and covering the rubber cushion 35. The rebound stopper 61 thus prevented prevents the cab (floating bar 11) from being lifted.

Thus, in this embodiment, the rubber cushion 35 that absorbs and blocks the slight vibration from the chassis frame 3 to the cab is directly attached between the floating bar 11 and the leaf spring 17, so that the conventional structure of FIG. Compared to this, there is an advantage that fine vibrations are not transmitted to the cab side, and no muffled sound is generated in the cab.
In addition, even when the rubber cushion 35 is damaged due to long-term use, the rebound stopper 61 prevents the cab from being lifted, so that safety during vehicle travel is also ensured.

FIGS. 7 to 9 show an embodiment of a cab mounting device according to claims 3 and 4. Hereinafter, the present embodiment will be described with reference to the drawings. The same components as those of the cab mounting device 79 are the same. Reference numerals are assigned and description of the structure is omitted.
At a 7, 81 similar to the rubber bumper 35 in FIG. 1, in Rabakussho down the sandwiched engagement portion of the leaf spring 17 and the floating bar 11, FIG. 8 is a cross-sectional view of the rubber bumper 81 .

In FIG. 8, reference numeral 83 denotes a seat plate made of a steel plate having a rectangular shape in plan view, and lock pin mounting bolts 87 are welded to circular mounting holes 85 provided on both ends thereof.
As shown in the figure, the lock pin mounting bolt 87 is composed of a bolt body 89 welded to the seat plate 83 and a threaded portion 91 whose outer periphery is threaded. As will be described later, the bolt body 89 and the threaded portion 91 are A bottom portion 25a of the lock pin 25 is placed on a stepped portion 93 formed therebetween.

  Further, the seat plate 83 is provided with a rubber member mounting hole 95 having a square shape in a plan view in parallel with a predetermined gap between the lock pins 87. A block-shaped rubber member (hard rubber) 99 provided with a boss insertion hole 97 having a circular cross section at the center is attached to both rubber member mounting holes 95, and the rubber member 99 is used for vulcanizing the rubber. By arranging the seat plate 83 in the mold, the seat plate 83 around the rubber member mounting hole 95 is embedded in the rubber member 99, and these are integrally attached.

Then, the spacer 101 is mounted at the bottom of the 7 rubber bumper 81.
As shown in the figure, the spacer 101 is composed of a rectangular seat plate 103 made of a steel plate and two bosses 105 attached thereto. The boss 105 is a pipe material that can be inserted into the boss insertion hole 97. Is formed. As shown in FIG. 9, the seat plate 103 is provided with two bolt insertion holes 107 having the same central axis as the boss 105.

Then, the leaf spring 17 as shown in FIGS. 7 and 9, the bolt insertion holes 107 and two rubber cushion mounting bolt 109 for inserting the boss 105 are inserted, the rubber as shown in FIG. 9 The cushion mounting bolt 109 is dimensioned to pass through a bolt insertion hole 111 provided in the floating bar 11 and a nut insertion hole 113 provided in the bottom 25 a of the lock pin 25.

On the other hand, on the upper surface (web) of the floating bar 11, as described above, the bolt insertion holes 115 through which the two bolt insertion holes 111 of the rubber cushion mounting bolt 109 and the bolt body 89 of the lock pin mounting bolt 87 are inserted. And are provided.
9, the bottom portion 25a of the lock pin 25 disposed on the floating bar 11 has a nut insertion hole 113 of the nut 117 attached to the rubber cushion mounting bolt 109 and the lock pin mounting as described above. A bolt insertion hole 119 of the bolt 87 is provided, and the rubber cushion 81 and the spacer 101 are fixed between the floating bar 11 and the leaf spring 17 by a rubber cushion mounting bolt 109 and a nut 117.

The bottom 25a of the lock pin 25 is placed on the stepped portion 93 of the lock pin mounting bolt 87 so as to be separated from the floating bar 11, and a rubber is formed by the lock pin mounting bolt 87 and the nut 121 attached thereto. The structure is fixed to the cushion 81.
As described above, the cab mounting device 123 according to the present embodiment fixes the rubber cushion 81 between the floating bar 11 and the leaf spring 17, and fixes the lock pin 25 to the rubber cushion 81 by separating the lock pin 25 from the floating bar 11. Therefore, even if the fine vibration in the high frequency region generated from the power unit or transmission mounted on the chassis frame 3 is transmitted to the leaf spring 17, the rubber cushion 81 (rubber member 99) naturally absorbs the fine vibration. Because of the structure in which the lock pin 25 and the floating bar 11 are separated from each other, fine vibrations are not directly transmitted from the floating bar 11 to the cab.

Therefore, the cab mounting device 123 according to the present embodiment also has an advantage that fine vibrations are not transmitted to the cab side as compared with the conventional structure of FIG. 10, and no muffled noise is generated in the cab.
However, as described above, the present embodiment is different from the cab mounting device 79 of FIG. 1 in that the lock pin 25 is separated from the floating bar 11 and fixed to the rubber cushion 81. Does not transmit directly, and as a result, there is an advantage that transmission of micro vibrations to the cab can be more reliably prevented.

Further, as shown in FIG. 8, in this embodiment, two rubber member mounting holes 95 are provided in the seat plate 83, and two block-shaped rubber members 99 are mounted in each rubber member mounting hole 95. The rubber member may have a large rectangular parallelepiped shape as indicated by a two-dot chain line.
However, in this case, since the central portion of the rubber member does not have a large effect on the cab mounting, by omitting the central portion of the rubber member as in this embodiment and using two rubber members 99 smaller than this, The cost for the rubber member can be reduced.

The structure of micro-vibration absorbing member is not limited to the rubber cushion 35,81, instead of the hard rubber 45 and the rubber member 99, can be applied to micro-vibration to reliably absorb possible member is long if the invention Of course.

It is a disassembled perspective view of the cab mounting apparatus which concerns on one Embodiment of Claim 1 and Claim 2 . FIG. 12 is an enlarged cross-sectional view of the cab mounting device of FIG. 1 corresponding to part A of FIG. It is a whole perspective view of a rubber cushion. It is a front view of a rubber cushion. It is a whole perspective view of a rebound stopper. It is a top view of a rebound stopper. It is a disassembled perspective view of the cab mounting apparatus which concerns on one Embodiment of Claim 3 and Claim 4 . It is sectional drawing of a rubber cushion. It is an expanded sectional view of the cab mounting apparatus of FIG. 7 equivalent to the A section of FIG. It is a side view of the conventional cab tilt mechanism. It is a X direction arrow line view of FIG. It is the A section expanded sectional view of FIG.

Explanation of symbols

1 Cab mounting bracket 11 Floating bar 17 Leaf spring 25 Lock pin 31 Tilt lock 35, 81 Rubber cushion 37 Upper seat plate 39, 43 Stopper piece 41 Lower seat plate 45, 49 Hard rubber 55 Floating bar mounting bolt 59 Leaf spring mounting Bolt 61 Rebound stopper 63, 65 Side wall 73 Bottom 75 Nut 77, 113 Nut insertion hole 79, 123 Cab mounting device 83, 103 Seat plate 87 Lock pin mounting bolt 93 Step 95 Rubber member mounting hole 97 Boss insertion hole 99 Rubber member 101 Spacer 105 Boss 107, 111, 115, 119 Bolt insertion hole 109 Rubber cushion mounting bolt 113 Nut insertion hole

Claims (4)

In a cab mounting device in which a floating bar that supports a cab is disposed on a cab mounting bracket fixed to a chassis frame via a leaf spring.
Form a bolt insertion hole in the leaf spring, the floating bar, and a lock pin arranged on the floating bar,
To the floating bar and leaf spring,
A rubber cushion in which a rubber member is bonded between an upper seat plate to which a floating bar mounting bolt that passes through the bolt insertion hole is attached and a lower seat plate to which a leaf spring mounting bolt that passes through the bolt insertion hole is attached. Is fixed with the floating bar mounting bolt and the nut attached thereto and the leaf spring mounting bolt and the nut attached thereto,
Cab mounting device, characterized in that the locking pin, and the solid deposited on the floating bar the floating bar mounting bolts and nuts which attach thereto. The cab mounting device according to claim 1, wherein a rebound stopper that wraps around a lower side of the leaf spring and covers the vibration absorbing member is attached to the floating bar . In a cab mounting device in which a floating bar that supports a cab is disposed on a cab mounting bracket fixed to a chassis frame via a leaf spring.
A plurality of bolt insertion holes are formed coaxially on the floating bar and a lock pin disposed on the floating bar ,
While forming the nut insertion hole on the lock pin coaxially with the bolt insertion hole of the floating bar,
Attach the rubber cushion mounting bolt that passes through the bolt insertion hole of the floating bar and the nut insertion hole of the lock pin to the leaf spring,
In the floating bar,
A rubber composed of a seat plate in which lock pin mounting bolts that pass through the floating bar and the bolt insertion hole of the lock pin are inserted at both ends, and a rubber member that is inserted into the seat plate and has a boss insertion hole formed Cushion
The rubber cushion mounting bolts that pass through the bosses and the bolt insertion holes of the floating bar, the nut insertion holes of the lock pins, through a spacer that a cylindrical boss that passes through the boss insertion hole from below is attached to the seat plate, Fastened with a nut attached to the rubber cushion mounting bolt in the nut insertion hole,
A cab mounting device, wherein the lock pin is fixed to a rubber cushion by separating the lock pin from the floating bar with the lock pin mounting bolt inserted through the bolt insertion hole provided in the floating bar and the lock pin, and a nut attached to the bolt. . The cab mounting device according to claim 3 , wherein two rubber members are juxtaposed between lock pin mounting bolts .

Images