JP2002087340A - Structure for attaching wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preclude other end part of a bearing shaft from floating up even when an attaching bolt is tightened, without welding a washer. SOLUTION: This structure for attaching wheel provides a pair of side walls 34 in a travel frame 7, the recess 39 of open lower end shape in lower end parts of the paired side walls 34, an engaging part 41 in both end parts of the bearing shaft 40 for supporting a wheel 12 rotatably, and arranges the shaft 40 between the paired side walls 34, wherein the engaging part 41 of the shaft 40 is engaged with the recess 39 in each of the respective paired side walls 34, and an attaching bolt 43 is screwed in the both end parts of the shaft 40 along an axial direction from an outside of the side walls 34 to fix tighteningly the shaft 40 to the paired side walls 34 by the bolt 43. An engaging mechanism 49 engaged to prevent the engaging part 41 of the bearing shaft 40 from coming off from a lower end opening of the attaching recess 39 is provided between the bearing shaft 40 side and the side wall 34 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel mounting structure for a turning machine or the like.

[0002]

2. Description of the Related Art For example, a turning work machine such as a backhoe has
As shown in FIGS. 12 and 13, as a wheel mounting structure,
At the lower end of the pair of side walls 62, a mounting recess 65 having an opening at the lower end is provided on a traveling frame 63 having a top wall 61 and a pair of side walls 62 in a U-shape. Fitting portions 68 are provided at both ends of the shaft 67, and the support shaft 67 is disposed between the pair of side walls 62.
Are fitted into the mounting recesses 65 of the pair of side walls 62, respectively.
A mounting bolt 71 is axially screwed to both ends of the support shaft 67 from outside the side wall 62 in an axial direction, and the support shaft 67 is fastened and fixed to the pair of side walls 62 by the mounting bolt 71.

However, when the wheels 66 are mounted on the traveling frame 63, the traveling frame is generally installed upside down so that the top wall 61 faces down, and the support shaft 67 is fastened between the side walls 62. Since the traveling frame 63 formed in a U-shape including the top wall 61 and the pair of side walls 62 is in an open state, one mounting bolt 71 is fastened to one end of the support shaft 67. As a result, the other end of the support shaft 67 rises to the lower end opening side of the mounting recess 65, and it becomes difficult to mount the support shaft 67 on the side wall 62. Therefore, conventionally, a flat washer 72 interposed between the head 71a of the mounting bolt 71 and the side wall 62 has been welded to the side wall 62 to prevent the support shaft 67 from floating.

[0004]

Therefore, conventionally, there was a problem that the welding of the flat washer 72 was troublesome and costly. In view of the above problems, the present invention does not require welding of a washer and prevents the other end of the support shaft from rising even when the mounting bolt is tightened.

[0005]

According to the technical means of the present invention for solving the above-mentioned problems, the traveling frame 7 is provided with a pair of side walls 34, and the lower ends of the pair of side walls 34 are attached to the lower end opening. A concave portion 39 is provided, fitting portions 41 are provided at both ends of a support shaft 40 that rotatably supports the rotating wheel 12, and the support shaft 40 is disposed between a pair of side walls 34, and a fitting portion of the support shaft 40 is provided. 41
Are fitted into the mounting recesses 39 of the pair of side walls 34, respectively.
In a rolling wheel mounting structure in which mounting bolts 43 are axially screwed to both ends of the support shaft 40 from outside the side wall 34 and the support shaft 40 is fastened and fixed to the pair of side walls 34 by the mounting bolts 43, An engagement mechanism 49 is provided between the support shaft 40 and the side wall 34 so that the fitting portion 41 of the shaft 40 is engaged with the lower end opening of the mounting recess 39 so as not to come off.

Another technical means of the present invention is to prevent the fitting portion 41 of the support shaft 40 from being pulled out of the lower end opening of the mounting recess 39 so as to lock the fitting portion 41 of the support shaft 40. The point is that the engaging mechanism 49 is configured by providing the locking portion 47 at the edge of the mounting concave portion 39. Another technical means of the present invention is that the mounting recess 39
Is formed in such a manner as to be inclined in the longitudinal direction, so that the retaining portion 47 for retaining is formed at the edge of the mounting concave portion 39.

Another technical means of the present invention is to provide a locking portion 53 on the side wall 34 and the head 4 of the mounting bolt 43.
The present invention is characterized in that the engaging mechanism 49 is configured by providing the washer 44 interposed between the 3a and the side wall 34 with the engaging portion 54 that engages with the locking portion 53.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a small turning backhoe 1 exemplifying a turning work machine adopting the present invention. The backhoe 1 is mainly composed of a traveling device 2, a revolving unit 3 and an excavating device 4. Hereinafter, the traveling direction of the backhoe 1 (the left-right direction in FIG. 3) is referred to as the front-rear direction, and the lateral direction orthogonal to the front-rear direction (the paper-penetrating direction in FIG. 3) is referred to as the left-right direction.

As shown in FIG. 3, the traveling device 2 is provided with a pair of left and right crawler traveling bodies 6 around which rubber or iron crawlers 5 are wound, and these traveling bodies 6 are driven by a traveling motor M. A crawler traveling device is employed. That is, the traveling device 2 includes a track frame 9 in which a pair of left and right traveling frames 7 shown in FIG. 4 are connected to each other by a center frame 8 at the center, and driving wheels 10 provided at the rear end of each traveling frame 7. An idler (idle wheel) 11 provided at the front end of each running frame 7; a small rolling wheel 12 provided at a lower portion of each running frame 7; and the crawler 5 wound around a range from the driving wheel 10 to the idler 11.
And

A dozer 1 is provided in front of the traveling device 2.
3 is provided, and a tension adjusting device (not shown) of the crawler 5 is provided in each traveling frame 7 of the traveling device 2. The revolving unit 3 includes a revolving frame 15 rotatably supported on a revolving bearing 14 provided above the center frame 8 of the traveling device 2 so as to be rotatable around a vertical revolving axis. And a hood 16 covering the device. A seat 17 is provided on the hood 16, and a control unit 18 is provided in front of the seat 17.

The revolving frame 15 is constituted by covering the outer periphery of a base plate having mounting brackets for various devices on the upper surface with a cover member made of FRP or sheet metal. The rear part of the revolving frame 15 is fixed to the base plate. The turning frame 15 is constituted by a counterweight 20 for balancing the weight with the excavator 4 and the like at the front. The turning frame 15 is rotated by a turning motor (not shown) fixed to its base plate.
It is adapted to be pivoted around. The backhoe 1 shown in FIG.
The rear side surface is formed in an arc shape so as not to protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 turns, the turning locus drawn by the rear surface of the revolving unit 3 falls within the left and right widths of the left and right crawler traveling units 6.

A swing bracket 22 for supporting the excavator 4 is pivotally mounted on the front end of the revolving frame 15 so as to be able to swing left and right about a vertical axis. The swing bracket 22 is provided inside the revolving frame 15 (not shown). Swing by the swing cylinder. The excavator 4 has a boom 2 whose base is pivotally attached to a swing bracket 22 so as to be swingable about a left-right axis.
3, an arm 24 pivotally attached to the distal end side of the boom 23 so as to be swingable about the left and right axes, and a bucket 25 attached to the distal end side of the arm 24 so as to be free to squeeze and dump.

The boom 23 includes a boom cylinder 26 provided between the swing bracket 22 and the middle of the boom 23.
The arm 24 is swung by the arm cylinder 27 provided between the middle of the boom 23 and the base of the arm 24.
The bucket 25 is squeezed and dumped by the bucket cylinder 28 provided between the base of the arm 24 and the mounting link of the bucket 25. 4 and 5, the track frame 9 includes a center frame 8 having a mounting hole for a swivel bearing 14 for rotatably supporting a swivel frame 15 at a central portion, and a front and rear portion connected to left and right ends of the center frame 8. A pair of right and left running frames 7 extending in the direction.

The pair of left and right running frames 7 are connected to the center frame 8 via a pair of front and rear connecting members 31, and the running frames 7 are connected to each other. Each traveling frame 7 is formed in a U-shape including a top wall 33 and a pair of side walls 34. The idler 11 is freely rotatably supported in a front end groove 35 formed in a front end portion of the traveling frame 7, and a motor case 36 projecting from a rear end portion of the traveling frame 7 has driving wheels made of sprockets. 10
Is accommodated therein. In addition, small rolling wheels 12 are provided at the lower edge of the traveling frame 7 at predetermined intervals so as to freely rotate.

On both left and right sides of the front end of the center frame 8, dozer brackets 38 for pivotally attaching the dozer 13 are provided.
At the center of the front end of the center frame 8, a cylinder bracket 39 for pivotally mounting a hydraulic cylinder for driving the dozer 13 is provided. 1, 2 and 5, a pair of left and right running frames 7 is shown.
At the lower ends of a pair of side walls 34 provided with a mounting recess 39 having an opening at the lower end. Small wheel 12 is bearing 3
8, and is rotatably supported on a support shaft 40. The support shaft 40 is formed in a round bar shape, and small-diameter fitting portions 41 are provided at both ends of the support shaft 40, and female screws 42 are formed at both ends of the support shaft 40 in the axial direction from the end surfaces thereof. The support shaft 40 is disposed between the pair of side walls 34, and the fitting portions 41 of the support shaft 40 are fitted into the mounting recesses 39 of the pair of side walls 34, respectively.
4, the mounting bolts 43 are axially screwed to both ends of the support shaft 40 via female screws 42 from the outside of the support shaft 40 so that the support shaft 40 is
Are fixed to the pair of side walls 34 with mounting bolts 43. A flat washer 44 is interposed between the head 43a of each mounting bolt 43 and the side wall 34.

The mounting recess 39 is formed at the lower end of the side wall 34 so as to incline in the longitudinal direction (front and rear) of the side wall 34 with respect to the vertical direction. A stopping portion 47 is formed, and the retaining portion 4 for retaining
Reference numeral 7 locks the fitting portion 41 of the support shaft 40 so that the fitting portion 41 of the support shaft 40 does not come out of the lower end opening of the mounting recess 39. Therefore, an engagement mechanism 49 is provided between the support shaft 40 and the side wall 34 so that the fitting portion 41 of the support shaft 40 is engaged with the lower end opening of the mounting recess 39 so as not to be pulled out. The engagement mechanism 49 includes a retaining portion 47 provided in the mounting recess 39 and an outer peripheral portion of the fitting portion 41 engaged with the retaining portion 47.

According to the above embodiment, when the small wheel 12 is mounted on the traveling frame 7, the traveling frame 7 is
The support shaft 40 is installed upside down so that the three sides face down.
Is fixed between the side walls 34. In this case, the top wall 33
When one of the mounting bolts 43 is tightened to one end of the support shaft 40 even when the traveling frame 7 formed in a U-shape having a pair of side walls 34 and Side is going to float to the lower end opening side of the mounting recess 39,
The retaining portion 47 for retaining is used to lock the fitting portion 41 of the support shaft 40 so that the fitting portion 41 of the support shaft 40 does not come off from the lower end opening of the mounting recess 39. The end side can be prevented from rising to the lower end opening side of the mounting recess 39, and the support shaft 40 can be easily tightened and fixed between the side walls 34.

FIGS. 6 to 8 show another embodiment, in which the lower end opening side of the mounting recess 39 of the pair of side walls 34 is formed so as to extend downward in a C-shape, and is formed in the middle of the mounting recess 39. A retaining portion 47 for retaining is projected. At both ends of the support shaft 40, notches 50 are provided which are cut out in a flat shape from the end surface of the support shaft 40 to a slightly central portion side of the fitting portion 41. Therefore, in this case, the support shaft 4 is set so that the cutout portion 50 corresponds to the retaining portion 47 of the mounting concave portion 39.
0, the fitting portion 41 of the support shaft 40 is fitted into the mounting recess 39, the support shaft 40 is disposed between the side walls 34, and then the support shaft 40 is rotated around the axis. After the notch 50 is directed upward, the mounting bolt 43 is inserted into the mounting recess 39 from outside the side wall 34 and the female screw 4 is inserted into the end of the support shaft 40.
The support shaft 40 may be fastened and fixed to the side wall 34 by the mounting bolt 43 by screwing through the fitting 2. In this case, the outer peripheral portion of the fitting portion 41 is The support shaft 40 can be prevented from falling out of the mounting recess 39 by engaging with the support shaft 47.

FIGS. 9 and 10 show another embodiment, in which a side wall 34 is provided with a locking portion 53 formed by a penetrating square hole, and is provided between the head 43a of the mounting bolt 43 and the side wall 34. The engaging portion 54 that engages with the locking portion 53 is bent and formed on the interposed flat washer 44. Therefore, in this case, the fitting portion 41 of the support shaft 40 is formed by the locking portion 53 provided on the side wall 34 and the engaging portion 54 provided on the flat washer 44.
Engaging mechanism 4 that engages so as not to come off from the lower end opening of 9
9 are configured. Other points are the same as those of the above-described embodiment.

FIG. 11 shows another embodiment, in which a pair of front and rear locking portions 53 constituted by concave grooves are provided on both front and rear sides of a mounting concave portion 39 of a side wall 34.
An engaging portion 54 that engages with the engaging portion 53 is formed in a flat washer 44 interposed between the side wall 34 and the flat washer 44. Therefore, in this case, the engagement portion 41 of the support shaft 40 is engaged with the engagement portion 54 provided on the flat washer 44 so that the engagement portion 41 of the support shaft 40 does not come off from the lower end opening of the mounting recess 39 by the locking portion 53 provided on the side wall 34. An engaging mechanism 49 is provided. Other points are the same as those of the above-described embodiment.

[0021]

According to the present invention, the other end of the support shaft 40 does not rise even when the mounting bolt 43 is tightened without welding the washer 44, and the rolling wheel 1 to the traveling frame 7 is not rotated.
2 can be easily mounted, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a wheel mounting portion showing an embodiment of the present invention.

FIG. 2 is a front sectional view of the traveling frame portion.

FIG. 3 is a side view showing the entire structure of the small turning backhoe.

FIG. 4 is an exploded perspective view of the track frame portion.

FIG. 5 is an exploded perspective view of the rolling wheel mounting portion.

FIG. 6 is a front sectional view of a wheel mounting portion showing another embodiment.

FIG. 7 is a side sectional view of the rolling wheel mounting portion.

FIG. 8 is a side cross-sectional view for explaining a mounting operation of the rolling wheel.

FIG. 9 is a front sectional view of a wheel mounting portion showing another embodiment.

FIG. 10 is a side sectional view of the rolling wheel mounting portion.

FIG. 11 is a front view of a wheel mounting portion showing another embodiment.

FIG. 12 is a front view showing a conventional example.

FIG. 13 is a front sectional view of the traveling frame portion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 backhoe 7 running frame 12 small wheel 34 side wall 39 mounting recess 40 support shaft 43 mounting bolt 44 flat washer 47 retaining portion 49 retaining mechanism 49 engaging mechanism 53 retaining portion 54 engaging portion

Claims (4)

[Claims] The traveling frame includes a pair of side walls, and a lower end of the pair of side walls is provided with a mounting recess having an opening at a lower end, so that the rolling wheel is rotatable. Fitting portions (41) are provided at both ends of a support shaft (40) that supports
The support shaft (40) is disposed between the pair of side walls (34), and the fitting portion (41) of the support shaft (40) is connected to the pair of side walls (34).
, And the mounting bolt (43) is axially screwed to both ends of the support shaft (40) from the outside of the side wall (34) to connect the support shaft (40) to the pair of support recesses (39). Side wall (34)
In the rolling wheel mounting structure, the mounting portion (41) of the support shaft (40) is engaged so as not to come off from the lower end opening of the mounting recess (39). Joint mechanism (49)
Is provided between the support shaft (40) side and the side wall (34) side. 2. The support shaft (4) so that the fitting portion (41) of the support shaft (40) does not come out of the lower end opening of the mounting recess (39).
0) The retaining portion (4) for retaining the fitting portion (41).
7) A rolling frame mounting structure for a traveling frame, wherein the engaging mechanism (49) is provided by providing an edge of the mounting recess (39). 3. The retaining recess is formed at the edge of the mounting recess by forming the mounting recess so as to be inclined in the longitudinal direction of the side wall with respect to the vertical direction. 3. The wheel mounting structure according to claim 2, wherein a portion (47) is formed. 4. A locking portion (53) is provided on the side wall (34), and a washer (44) interposed between the head (43a) of the mounting bolt (43) and the side wall (34) is provided. The rolling wheel mounting structure according to claim 1, wherein the engagement mechanism (49) is configured by providing an engagement portion (54) that engages with the locking portion (53).