JPH0735775Y2 - Mobile crane transmission mount structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a transmission mount structure applied to a mobile crane such as an all-terrain mobile crane.

(Prior art and its problems) Rough terrain mobile cranes and all-terrain mobile cranes are known as mobile cranes that emphasize maneuverability in the field. It has a wheel drive function (4WD), all-wheel steering function (4WS), a short wheel base, and a large diameter single tire.

In this way, this type of mobile crane has a short chassis frame due to its function, and further, the carrier house is provided at the front end of the chassis frame, and the crane and the crane house are provided at the approximate center through the turntable. Since it is not possible to mount an engine, transmission, etc. on the chassis frame, the chassis frame with the conventional closed cross-section welding structure must have enough space to mount the transmission, etc. I can't.
Therefore, the left and right side members of the chassis frame are formed into a box-type closed cross-section structure, and the substantial center for arranging the swivel seat is integrally formed, and the front and rear ends of each side member are respectively connected by a box-type closed cross-section structure cross member. However, if a space is secured between the left and right side members as a chassis frame structure between the central swivel seat portion and the front end and between the central swivel seat portion and the rear end, a cross member other than the above-mentioned front and rear end cross members is not attached, A transmission, an engine, etc. can be arranged between the left and right side members immediately behind the carrier house and in front of the swivel seat, and a fuel tank etc. can be arranged between the left and right side members behind the swivel seat.

However, when a chassis frame with such a structure is used, due to insufficient bending steel properties of the frame, etc., relative twisting occurs between the left and right side members or between the front and rear parts of the side member during crane hanging work or traveling on uneven terrain. Or relative displacement (shear deformation) may occur. If the transmission is rigidly attached to such a chassis frame, there is a problem that the transmission case is deformed by applying an excessive force due to the relative twist and displacement of the left and right side members.

The present invention has been made to solve the above-mentioned problems, and provides a transmission mount structure for a crane vehicle having a high degree of freedom with respect to relative twist and relative displacement between the left and right side members or the front and rear portions of the side members. The purpose is to provide.

(Means for Solving the Problem) In order to achieve the above object, according to the present invention, in a transmission mount structure of a mobile crane mounted between right and left side members, both ends are provided with elastic members. Respectively, the input shaft outer periphery projecting to the one end face of the transmission is fixedly supported via an elastic member at a substantially intermediate position of a support member that is laterally mounted between the both side members, and Each side wall on the other side is fixed to and supported by a bracket protruding from each side member via an elastic member.

(Operation) The transmission is supported at three points, that is, the input shaft outer peripheral portion projecting on one end surface and each side wall portion on the other side, and the left and right end portions of the support member with respect to the supporting positions of the left and right side wall portions. Even if the support positions of the parts are twisted relative to each other, or even if they are relatively displaced in the shearing direction (vertical direction), the displacement of the central position of the support member is smaller than the displacement of both ends thereof. For this reason, the transmission is free about the input shaft against relative twisting or vertical shear deformation between the left and right side members or the front and rear parts of the side members that occur during hanging work or traveling on rough terrain. Therefore, no excessive force is applied to the transmission case. Further, the displacement of each support portion is very small in any case, and the minute displacement is also absorbed by the deformation of the elastic member, so that it is further difficult for the excessive force to be transmitted to the transmission case.

Embodiment An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the appearance of an all-terrain crane vehicle according to the present invention. In an all-terrain crane vehicle 1, a crane 4 is mounted via a turntable 3 on a chassis frame 2 extending over substantially the entire length of the vehicle. A carrier house 5 is provided at the front end of the and a crane 4 is provided at the turntable 3.
Crane houses 6 that rotate together are provided respectively, and the crane vehicle 1 can be operated in each of the houses 5, 6.

A front outrigger box 7 and a rear outrigger box 8 are attached to the front and rear lower surfaces of the chassis frame 2, and outriggers (not shown) are housed in the outrigger boxes 7 and 8 and are used for suspending the crane 4. The outriggers are juxtaposed laterally to fix the chassis frame 2 and the suspending work is performed. Large-diameter single tires 9 and 10 are attached between the outrigger boxes 7 and 8 and adjacent to the outrigger boxes 7 and 8.

Axles 11 and 12, to which wheels 9 and 10 are attached, are suspended on a chassis frame via tapered leaf springs and hydraulic cylinders (neither shown), respectively. This hydraulic cylinder has functions such as a shock absorber function, an anti-nose dive function at the time of braking or turning, an on-tire function at the time of low speed suspension.

The chassis frame 2 includes left and right side members 20, 20 (second
(See the drawing) and a cross member (not shown) that connects the front and rear ends of the side members 20, 20. The substantially central positions of both side members 20, 20 are integrally connected by the turntable 3 described above, and the front and rear of the main frame 2 with the central part sandwiched therebetween are connected in an annular shape by the side member 20 and the cross member. There is. That is, substantially no cross members are bridged between the side members 20 except the cross members arranged at the front and rear ends of the main frame 2. Each side member 20 includes an upper plate 20a, an outer plate 20b, an inner plate 20c, and a lower plate 20d.
It has a box-shaped closed cross-section. The cross member is also formed in a box-shaped closed cross-section like the side member 20, and the upper plate, outer plate, inner plate, and lower plate of the cross member and the left and right side members 20 are continuously connected to each other, The torsional rigidity of the frame is improved.

The output of the engine 13 mounted behind the carrier house 5 and between the left and right side members 20 of the chassis frame 2 is the output of the transmission 14, which is mounted behind the engine 13 and between the left and right side members 20, on the rear side. Propeller shaft 15
And the transmission to the rear wheels 10 via the final transmission (not shown), and by engaging the dog clutch built into the transmission 14, the dog clutch, the front side propeller shaft 16 and the front side It is transmitted to the front wheels 9 via a final transmission (not shown).

2 to 5 show an embodiment of the transmission mount structure according to the present invention, and FIG. 2 is a top view thereof.
FIG. 3 is a partial cross-sectional view seen from the rear, and FIGS. 4 and 5 are IV-IV arrow views and V-V arrow views of FIG. 2, respectively.

The transmission 14 is mounted between the left and right side members 20 as shown in FIG. 2 and projects from the front end face of the input shaft.
The front stay using three points of bosses 14b and 14c formed on the outer periphery of 14a and the lower left and right side walls near the rear end as a support member.
Left and right side members 20 via 30 and rear stays 40, 40
Is installed in. More specifically, the front stay 30 that supports the outer periphery of the input shaft 14a of the transmission 14
As shown in FIG. 3 and FIG. 4, each has a rectangular cross-section, a semicircular recess 30a in the center, and support arms 30b and 30b extending from the recess 30a to both sides. A bolt insertion hole 30c is formed at the end of the arm 30b. In the recess 30a of the front stay 30, a stay cover 31 that makes a pair with the recess 30a is formed.
Is placed and fixed. The stay cover 31 is a front stay
The recess 30a of the front stay 30 and the stay cover 31 are composed of a semicircular recess 31a that is symmetrical to the recess 30a of the front end 30, and a flange portion that projects laterally from the end of the recess 31a.
The input shaft 14a and the recess 31a are opposed to each other so as to sandwich the outer periphery of the input shaft 14a, and are fixed to the front stay 30 by bolts 32.
Thick hard rubbers (elastic members) 33a and 33b are vulcanized and adhered to the inner peripheral surfaces of the recesses 30a and 31a, respectively.

A bracket 34 is bored at an intermediate position of the inner plate 20c of each side member 20. The bracket 34 is composed of, for example, a rectangular upper plate 34a and side plates 34b of a substantially right triangle that hang downward at both ends of the upper plate 34a, and these are integrally bent. The bracket 34 has a strength necessary to support the front stay 30, and is formed of, for example, a thick steel plate, and is welded to a predetermined position of the inner plate 20c along the back side edge. . The brackets 34, 34 are attached to the left and right support arms 30 of the front stay 30.
b and 30b are supported and fixed via a rubber (elastic member) 35. More specifically, the upper and lower surfaces of the support arm 30b are placed on the bracket 34 in a state of being sandwiched by the thick disk-shaped rubber 35 having a bolt insertion hole 35a formed in the center thereof, and the upper side. Plate 3 with bolt insertion holes 36a on the top surface of rubber 35
After the 6 is placed, these are screwed and fixed with the bolt 37 and the nut 38.

The rear stay 40 that supports the boss portion 14b of the transmission 14 is, for example, as shown in FIG. 3 and FIG. 5, formed by bending the substantially center of a thick steel plate toward each side member 20 in a hook shape. The boss part 14 of the transmission 14 has a sufficient strength to mount the transmission 14
A plurality of, for example, four bolts 41 are screwed and fixed to b.

The horizontal portion of the rear stay 40 is supported and fixed to a bracket 42 attached to the lower surface of the lower plate 20d of the side member 20 via a rubber 43. The bracket 42 includes, for example, a rectangular lower plate 42a and side plates 42b and 42b of substantially parallelograms integrally bent upward on both sides of the lower plate 42a.
The vertical cross section is substantially U-shaped. And the bracket
The lower plate 42a is welded to the lower plate 20d so that the lower plate 42a thereof is obliquely below the lower plate 20d of the side member 20 and extends toward the transmission 14 side in parallel with the lower plate 20d. The bracket 42 is formed of, for example, a thick steel plate and has a strength necessary to support the rear stay 40.

The horizontal portion of the rear stay 40 described above is supported and fixed to the bracket 42 via a rubber 43. More specifically, the horizontal portion of the rear stay 40, the upper and lower surfaces thereof, and the bolt insertion hole at the center
A plate in which 43a is placed on the upper surface of the lower plate 42a of the bracket 42 in a state of being sandwiched by the thick disk-shaped rubber 43, and the upper rubber 43 is further provided with a bolt insertion hole 44a. After placing 44, these are screwed and fixed with bolts 45 and nuts 46.

In the above description, the mounting structure on the side wall at the rear of the transmission has been described only with respect to the support by the boss portion 14b, but the support structure by the boss portion 14c is also the same structure, and therefore the description thereof will be omitted.

The operation will be described below.

The transmission 14 has an input shaft 14a protruding toward the front end surface.
The bosses 14b and 14c provided on the outer periphery and the left and right rear side walls are supported at three places, and the left and right side members 20 are twisted relative to each other.
Alternatively, in the case of relative shear deformation, the displacements of the above three support portions are conceptually shown in FIGS. 6 (a) and 6 (b). First,
When the side member 20 is subjected to relative twist during suspension work or traveling on rough terrain, the front stay 30 is relatively moved with respect to the displacement of the boss portions 14b and 14c on the rear side wall of the transmission as shown in FIG. 6 (a). It will be twisted in the direction of the arrow. At this time, both ends of the front stay 30 are side members.
Displaces significantly with displacement of 20, but front stay 30
The displacement of the central portion of the input shaft 14a, that is, the support portion of the input shaft 14a is small. This small displacement is absorbed by the rubbers 33a, 33b, 35, 43, which are elastic members interposed in the respective support portions, and an unreasonable force due to the relative twist of the side member 20 is not transmitted to the transmission 14. Next, in the case where the left and right side members 20 are sheared in the vertical direction, the respective support portions tend to be displaced in the arrow direction from the state shown by the broken line before the deformation as shown in FIG. 6 (b). At this time, a shearing force acts on the support portion of the rear side wall of the transmission 14 to generate a bending moment, and a force that twists and deforms the case of the transmission 14 works.
Since the front side wall is not restrained and is supported by the input shaft 14a, the transmission 14 can be rotated about this input shaft 14a in the direction in which the bending moment acts. No unreasonable force is applied to the case, and the minute displacement at each support portion is absorbed by the rubber 33a, 33b, 35, 43 of the elastic member.

(Effect of the Invention) As described above, according to the present invention, both ends are respectively attached to the left and right side members via the elastic members, respectively, and substantially at the intermediate position of the supporting member which is horizontally extended between the both side members. The outer periphery of the input shaft projecting to the end face on one side of the transmission is fixedly supported via elastic members, and the side walls on the other side of the transmission are fixedly supported on the brackets protruding from each side member via elastic members. Therefore, the chassis frame has a high degree of freedom in displacement relative to the relative torsion and relative shear displacement of the side members, and it is difficult to transmit an unreasonable force due to the relative twist of the side members to the transmission, and many precision gears are stored inside the case. There is an excellent effect that the transmission case can be protected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing the appearance of an all-terrain crane vehicle to which the present invention is applied, FIG. 2 is a top view showing a transmission mount structure to which the present invention is applied, and FIG. Partial sectional view, FIG. 4 is a sectional view taken along the line IV-IV in FIG.
FIG. 5 is a sectional view taken along the line VV in FIG. 2, and FIG. 6 is a skeleton diagram conceptually showing the displacement of the support portion of the transmission 14. 1 ... All-terrain mobile crane, 2 ... Chassis frame, 13 ... Engine, 14 ... Transmission, 14a
...... Input shaft, 20 …… Side member, 20c …… Inner plate, 20d …… Lower plate, 30 …… Front stay (supporting member), 31 …… Stay cover, 33a, 33b, 35,43…
… Rubber (elastic member), 34,42 …… Bracket, 36,44…
… Plates, 37, 41, 45… Bolts, 38, 46… Nuts, 4
0 …… Rear stay.

Claims (1)

[Scope of utility model registration request] 1. A transmission mount structure for a crane vehicle mounted between left and right side members, wherein both ends are attached to each of the side members via elastic members, and a support member laterally mounted between the side members is provided. The input shaft outer periphery protruding to one end face of the transmission is fixedly supported at an approximately intermediate position through an elastic member, and each side wall on the other side of the transmission is elastically attached to a bracket protruding from each side member. Transmission mount structure for mobile cranes characterized in that they are fixedly supported via members.