JP3917448B2 - Tractor front guard device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front guard device for a tractor.
[0002]
[Prior art]
In a loader working machine equipped with a front loader at the front part of the tractor, a front guard device is provided to protect the front surface of the tractor, and this front guard device is usually connected to the front end portion of the front axle case and the loader support frame. It can be attached to etc.
On the other hand, there is a loader working machine in which a front loader is detachable so that another work machine can be connected to a three-point link mechanism or the like at the rear of the tractor.
[0003]
[Problems to be solved by the invention]
When other work equipment is connected to the rear of the tractor, weight may be provided at the front of the tractor to balance the front and rear weights. In this case, the front guard must be removed and replaced with a weight mounting bracket. There wasn't.
In addition, there is known a structure in which a weight mounting bracket is attached to the front guard, but in any case, a complicated operation for attaching the weight mounting bracket is required.
[0004]
The present invention aims to solve the above problems.
[0005]
[Means for Solving the Problems]
In the present invention, the rear lower portion of the front guard 51 that protects the front surface of the front grill of the tractor 2 is attached to the front axle frame 5.
The front guard 51 includes left and right side frame members 52 and 52 that are long in the vertical direction on the front side of the front grill, a horizontal frame member 53 that is installed at least on the left and right side frame members 52 and 52, Front and rear connecting plates 56, 57 installed between the lower portions of the side frame members 52, 52;
The front and rear connecting plates 56 and 57 constitute a mounting portion 55 for detachably mounting the weight W.
Accordingly, it is not necessary to replace the front guard with a weight mounting bracket or to attach a weight mounting bracket to the front guard, and the weight can be mounted on the mounting portion of the front guard as it is. Further, the structure can be strengthened by connecting the left and right side frame members with the front and rear connection plates, and the number of parts can be reduced and the cost can be reduced by configuring the mounting portion with the front and rear connection plates.
[0006]
The left and right frame members 52, 52 have a main portion 52a extending in the vertical direction and a rear extending portion 52b extending rearward from the lower end of the main portion 52a, and a rear end portion of the rear extending portion 52b. A mounting plate 54 to be attached to the front axle frame 5 is fixed.
Further, the front side connecting plate 56 is disposed vertically on the front end portions of the left and right side frame members 52, 52 to form a locking portion of the weight W, and the rear side connecting plate 57 is formed of the mounting plate 54. A receiving portion is formed which is disposed laterally so as to face the front surface and receives the rear portion of the weight W from above.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a loader working machine in which a front loader 3 is attached to the front portion of a tractor (traveling vehicle) 2.
The vehicle body 4 of the tractor 2 connects an engine, a clutch housing, and a transmission case in the front-rear direction, a front axle frame 5 is fixed to the lower side of the engine, a front axle case 6 is supported on the front axle frame 5, The rear axle case 7 is fixed to the rear part of the case. A pair of left and right front wheels 8 serving as steering wheels are attached to the front axle case 6 via the front axle, and a pair of left and right rear wheels 9 serving as drive wheels are attached to the rear axle case 7 via the rear axle. Yes.
[0008]
The engine is housed in the front bonnet 10, a driver seat 11A is provided above the rear of the vehicle body 4, and a steering handle 11B is provided in front of the driver seat 11A.
As shown in FIGS. 2 and 3, the front loader 3 is mainly configured by including a frame 12, a boom 13, and a bucket (work implement) 14.
The frame 12 includes a support base 15 disposed on the front side of the vehicle body 4 so as to protrude laterally outward from the vehicle body 4, a mounting bracket 16 for fixing the support base 15 to the vehicle body 4, and the support. A boom support 17 erected on the base 15; a connecting frame 18 that is disposed in the front-rear direction on the side of the vehicle body 4 and that has a front end connected to the boom support 17 and a rear end connected to the rear of the vehicle 4; The main structure is provided with a pair of left and right.
[0009]
In this embodiment, the support base 15 is made of a cylindrical pipe material having a horizontal axis, and the mounting bracket 16 is fixed to the inner end of the support base 15 in the left-right direction by welding or the like. The mounting bracket 16 is made of a plate material or the like, and is fixed to the vehicle body 4 such as the front axle frame 5 by bolts.
The support base 15 may be formed in a rectangular tube shape.
The left and right mounting brackets 16 may be connected to each other by a connecting frame (not shown), and the connecting frame may be attached and fixed to the lower surface of the vehicle body 4.
[0010]
As shown in FIG. 4, the boom support body 17 is mainly composed of a main frame 19 fixed to the outer end side in the left-right direction of the support base 15 and a subframe 20 detachably attached to the main frame 19. ing.
As shown in FIGS. 5 to 7, the main frame 19 is formed in a U-shape in plan view having left and right side walls 19 a and 19 b and a back wall 19 c by bending a plate material, and is a front portion in the middle in the vertical direction. The left and right side shafts 19a and 19b are provided on the side with support shafts 21 in the left-right direction, and the upper portion is provided with an insertion hole 22 penetrating the left and right side walls 19a and 19b.
[0011]
As shown in FIG. 7, the left and right outer portions of the support base 15 penetrate the lower portions of the left and right side walls 19a and 19b, and the outer end portion 15a of the support base 15 protrudes from the outer side wall 19a. Yes. And the outer peripheral surface of the support stand 15 is joined to the outer surface of the left and right side walls 19a and 19b (the surface opposite to the opposing surface of the left and right side walls 19a and 19b) by welding Y, whereby the support stand 15 The bonding strength between the main frame 19 and the main frame 19 is increased.
Further, since the side walls 19a and 19b are joined to the support base 15 by welding on the outer surface rather than the narrow space on the inner side, the joining work can be easily performed. In particular, since the outer end portion 15a of the support base 15 protrudes from the left and right side walls 19a, the portion can be easily joined from the left and right outer sides of the main frame 19.
[0012]
Since the support base 15 penetrates the main frame 19, the load applied to the main frame 19 from the boom 13 can be received by the outer surface (outer peripheral surface) of the support base 15, and the load resistance is improved. .
The support base 15 also penetrates the mounting bracket 16 in the left-right direction, its left and right inner end portions 15 b protrude from the mounting bracket 16, and the outer peripheral surface of the support base 15 is welded to both the front and back surfaces of the mounting bracket 16. Joined at Y.
The thickness t of the pipe material constituting the support base 15 is thicker than that of the main frame 19, where the strength of the support base 15 itself is increased and various reinforcing members are not required. The mounting bracket 16 is also made of a thick plate material substantially the same as the support base 15.
[0013]
As shown in FIG. 4, the sub-frame 20 is formed in an open U-shape in front of a flat cross section from the left and right side walls and the back wall, and reinforcing plates 24 and 25 are provided between the left and right side walls. In addition, a fitting member 26 is provided on the front side of the lower end between the left and right side walls, and the fitting member 26 is provided with an arcuate recess 26a that is open downward and extends between the left and right side walls. ing.
Insertion holes 27, 28, and 29 penetrating the left and right side walls are formed in the upper part of the subframe 20 and in front and rear of the middle part in the vertical direction.
[0014]
Then, with the recess 26 a of the subframe 20 fitted to the support shaft 21 of the main frame 19 from above, the insertion hole 27 on the rear side in the middle of the vertical direction of the subframe 20 coincides with the insertion hole 22 of the mainframe 19. The sub-frame 20 is fixed to the main frame 19 by inserting the connecting pin 30 through the insertion holes 22 and 27.
Further, the sub-frame 20 can be detached from the main frame 19 by the reverse operation described above, whereby the front loader 3 is configured to be detachable from the tractor 2.
[0015]
A boss guide 31 that fits a boss provided on the edge of the insertion hole 27 on the outer surface side of the subframe 20 is provided on the upper part on the inner surface side of the left and right side walls 19a of the main frame 19.
Further, the main frame 19 and the sub frame 20 of the boom support body 17 may be integrally formed, and the front loader 3 may be fixed to the tractor 2 so as not to be detachable.
The connection frame 18 is formed of a long plate material, and is disposed in the front-rear direction on the lower side of the vehicle body 4 from the front to the rear.
[0016]
The front part of the connecting frame 18 is bolted to a fixture 36 formed by extending the left and right inner side (vehicle body 4 side) side walls 19b of the main frame 19 downward, and the rear part of the connecting frame 18 is It is connected to the vehicle body 4 by being fixed to the axle case 7 with a bolt via a bracket 37 (see FIG. 1) or the like.
Therefore, the load applied from the boom 13 side to the boom support body 17 can be suitably distributed to the connection frame 18 directly connected to the boom support body 17, and the joint portion between the boom support body 17 and the support base 15 can be dispersed. Stress can be reduced. Moreover, since the thickness of the support base 15 itself is thick, it has a structure that can suitably withstand bending and twisting due to a load from the boom 13.
[0017]
Further, the boom 13 is connected to the upper part of the boom support 17 above the support base 15, whereas the connection frame 18 is connected to the lower part of the boom support 17 below the support base 15. Therefore, in particular, when a rearward load is applied from the boom 13, the connecting frame 18 receives a tensile load and can suppress torsion with respect to the support base 15.
With the above structure, the strength can be ensured without the conventional brace and the structure can be simplified.
[0018]
Since the attachment 36 is integrally formed by extending the side wall 19b of the boom support body 17 downward, the number of parts is reduced as compared with the case where it is formed by other members and joined by welding or the like. Can be manufactured easily.
The rear end side of the connection frame 18 may be directly fixed to the vehicle body 4 or may be fixed to another member that is attached and fixed to the vehicle body 4 side.
In the case of a type in which a backhoe can be attached to the rear portion of the tractor 2, the rear end side of the connection frame 18 may be connected and fixed to a backhoe attachment frame that is attached and fixed to the rear axle case 7.
[0019]
The attachment 36 may be formed by extending the left and right outer side walls 19a of the main frame 19 downward, forming both the left and right side walls 19a, 19b on the both sides, and forming a bifurcation on them. Or it is good also as a structure which connects the two connection frames 18. FIG.
It is also possible to provide the fixture 36 on the back wall 19c of the main frame 19 so as to protrude rearward.
The strength of the frame 12 is increased by the structure in which the connecting frame 18 is directly attached to the lower part of the boom support body 17, the structure in which the support base 15 is thickened, the structure in which the support base 15 penetrates the boom support body 17 and protrudes. In particular, the main frame 19 of the boom support body 17 is not provided with a reinforcing member other than the configuration described above, and has a very simple structure.
[0020]
As shown in FIGS. 1 to 3, the boom 13 is provided in a pair on the left and right sides, and the base end side (rear end side) is inserted into the insertion hole 28 of the subframe 20, and the left and right shafts are attached to the subframe 20. A bucket 14 is pivotally attached to the front end of the boom 13 so as to be rotatable about an axis in the left-right direction.
The front sides of the left and right booms 13 are connected to each other by a connecting pipe 32.
A boom cylinder 33 is interposed between the boom support body 17 and the boom 13. The rear end of the boom cylinder 33 is pivotally supported via a pin in the insertion hole 29 of the subframe 20, and the front end of the boom cylinder 33 is pivotally supported via a pin in the middle part of the boom 13. The boom 13 is swung by the expansion and contraction.
[0021]
A bucket cylinder 34 is disposed on the front upper side of each boom 13, the proximal end side of the bucket cylinder 34 is pivotally attached to the middle part of the boom 13, and the bucket cylinder 34 has a bucket via a pair of links. 14 is connected, and the bucket 14 is configured to be squeezed and dumped by expansion and contraction of the bucket cylinder 34.
The main frame 19 of the boom support 17 is provided with a control valve 49 for controlling the boom cylinder 33 and the bucket cylinder 34 and an operation lever 50 for operating the control valve 49. Further, instead of the bucket 14, other work tools (roll grabs, forks, etc.) may be attached to the boom 13.
[0022]
As shown in FIGS. 8 and 9, the boom 13 includes a front structure 40, a rear structure 41, and an intermediate structure 42 that connects them.
The front structure 40 and the rear structure 41 are provided between a pair of left and right side wall parts 43a, an upper wall part 43b provided between the upper parts of the pair of side wall parts 43a, and a lower part of the pair of side wall parts 43a. The lower wall 43c has a box shape with a rectangular cross section.
The left and right side wall portions 43a, 43a and the upper wall portion 43b are integrally formed by bending a plate material into a U shape, and the lower wall portion 43c is bridged between the lower portions of the left and right side wall portions 43a and joined by welding. It is comprised with the board material.
[0023]
The intermediate structural body 42 has an upper connecting plate 44a that connects the upper wall portions 43b and 43b of the front structural body 40 and the rear structural body 41, and a horizontal connecting plate 44b that connects the side wall portions 43a and 43a. The lower wall portions 43c and 43c are abutted with each other and joined by welding.
The front side of the left and right horizontal connecting plates 44b, 44b protrudes above the upper wall 43b of the front structure 40, and a pivot 44c that pivotally supports the base of the bucket cylinder 34 is provided at this protruding portion. Forming. On the other hand, the front side of the left and right side wall parts 43a, 43a of the rear structure 41 protrudes downward from the lower wall part 43c, and a pivotal support part 43d that pivotally supports the base part of the boom cylinder 33 is formed in this protruding part. Yes.
[0024]
In the conventional boom, the upper connecting plate 44a extends rearward on the upper surface of the upper wall 43b of the rear component 41, and another reinforcing plate is attached to the upper surface of the upper wall 43b of the front component 40. However, in this embodiment, the front and rear portions of the upper connecting plate 44a slightly overlap the front and rear upper wall portions 43b and 43b, and other reinforcing plates are also omitted, thereby simplifying the structure. Has been.
In addition, a side plate 45 having an elliptical shape in a side view is fixed to the inner side surface of the front structure 40 around the connection pipe 32.
[0025]
The conventional boom has a structure in which a reinforcing plate is installed between the upper wall portion 43b of the front structure 40 and the upper surface of the connecting pipe 32. The number of parts is large and the structure is complicated. In the embodiment, such a reinforcing plate is also omitted, and by providing the side plate 45, the connection portion between the connecting pipe 32 and the side wall portion 43a is thickened to increase the strength, and the structure is simplified.
10 and 11 show the structure of the pivotal support portion (rear end portion) of the boom 13 with respect to the boom support body 17, and the left and right side wall portions (first wall portions) 43a, 43a and the upper wall portion ( The second wall portion 43b is formed into an integral U shape by bending the plate material, and the lower wall portion (second wall portion) 43c is separated from this and joined by welding. Yes.
[0026]
In addition, a cylindrical boss portion 46 is inserted between the left and right side wall portions 43a, 43a through which the connecting shaft with the boom support body 17 is inserted.
A reinforcing piece 47 for connecting the upper wall portion 43b and the boss portion 46 is provided at the rear end portion of the upper wall portion 43b.
The reinforcing piece 47 is formed integrally with the upper wall portion 43b as shown in FIG. 12 showing the upper side of the rear structure 41, and is bent at a broken line so that the lower end of the reinforcing piece 47 becomes the boss portion 46. It is abutted against the upper surface and joined by welding.
[0027]
Therefore, compared with the case where the reinforcing piece 47 is configured as a separate body and joined to both the upper wall portion 43b and the boss portion 46 by welding, the number of parts and the number of manufacturing steps can be reduced, and the cost can be reduced. It leads to.
In addition, 47a is a hole formed between the reinforcing piece 47 and the side wall 43a and the upper wall 43b, and cracks when the reinforcing piece 47 and the side wall 43a are bent and stress concentration at these boundary portions. It is to prevent.
A reinforcing piece 48 for connecting the lower wall portion 43c and the boss portion 46 is also provided at the rear end portion of the lower wall portion 43c. The reinforcing piece 48 is formed integrally with the lower wall portion 43c, By bending, it is abutted against the lower surface of the boss portion 46 and joined by welding.
[0028]
Therefore, the number of parts, the number of manufacturing steps, and the cost can be reduced as compared with the case where the reinforcing piece 48 is also configured separately from the lower wall portion 43c.
Note that, in the above, only one reinforcing piece 47, 48 is formed integrally with the upper wall portion 43b or the lower wall portion 43c (the other is joined by welding as a separate body from the upper wall portion 43b, the lower wall portion 43c). Alternatively, the four wall portions 43a, 43b, and 43c may be formed by bending a single plate material. Moreover, the cross-sectional shape of the boom 13 can also be made into an octagon shape in which square corners are inclined planes.
[0029]
As shown in FIGS. 1 and 2, a front guard 51 that protects the front surface of the tractor 2 is provided on the front side of the front grill of the tractor 2.
As shown in detail in FIGS. 13 and 14, the front guard 51 includes a pair of left and right side frame members 52 that are long in the vertical direction, a horizontal frame member 53 installed between the left and right side frame members 52, An attachment plate 54 for attaching the side frame member 52 to the front axle frame 5 is provided.
The side frame member 52 has a main portion 52a extending in the vertical direction and a rear extending portion 52b extending rearward from the lower end of the main portion 52a, and the mounting plate 54 is fixed to the rear end portion of the rear extending portion 52b. Has been.
[0030]
The side frame member 52 has a vertically middle part bulged (bent) outwardly in the left and right direction when viewed from the front, and the rearward extending part 52b is wider than the main part 52a when viewed from the side.
A plurality (three in the illustrated example) of horizontal frame members 53 are provided and are arranged at substantially equal intervals with respect to the main portion 52a.
When another work machine is attached to the rear part of the tractor 2, a weight may be attached to the front part of the tractor 2 in order to balance the front and rear, but the weight W is attached to the front guard 51 of this embodiment. The part 55 is provided integrally.
[0031]
Therefore, the weight W can be attached while leaving the front guard 51 without removing the front guard 51 from the tractor 2 and replacing it with the bracket for attaching the weight.
The mounting portion 55 has front and rear connecting plates 56, 57 installed between lower portions of the left and right side frame members 52, and the front connecting plate 56 is disposed vertically at the front end portion of the side frame member 52. Thus, the engaging portion of the weight W is formed, and the rear connecting plate 57 is disposed laterally so as to abut the front surface of the mounting plate 54 and is a receiving portion that receives the rear portion of the weight W from above. .
[0032]
By configuring the mounting portion 55 with the connecting plates 56 and 57 installed on the left and right side frame members 52 in this way, the mounting portion 55 can be provided with a function as a reinforcement of the front guard 51, and conversely. For example, since it is possible to configure the weight mounting portion 55 using the connecting plates 56 and 57 as reinforcement of the front guard 51, an increase in the number of parts can be suppressed, and weight reduction and cost reduction can be achieved. Yes.
In particular, the structure of the mounting base portion of the front guard 51 with respect to the front axle frame 5 is strengthened by joining the rear connecting plate 57 to the mounting plate 54 and joining them together by welding and forming a substantially T shape therebetween. Has been.
[0033]
Since the connecting plates 56 and 57 are disposed within the side surface range of the side frame member 52 and do not protrude forward from the side frame member 52, and are disposed on the rear side of the lateral frame member 53. The protruding amount is suppressed so that the weight W attached thereto does not protrude too much from the front guard 51.
The number of the horizontal frame members 53 can be changed without being limited to the above (three), and a configuration in which one horizontal frame member 53 is provided only at the upper ends of the left and right side frame members 52 and 52 may be employed. In this case, the horizontal frame member 53 and the side frame member 52 may be integrally configured by bending a plate member.
[0034]
The present invention is not limited to the embodiment described above, and can be appropriately changed in design.
[0035]
【The invention's effect】
According to the present invention, the weight can be directly attached to the front guard.
[Brief description of the drawings]
FIG. 1 is a side view of a loader working machine.
FIG. 2 is a front view of a boom support structure.
FIG. 3 is a plan view of a front loader.
FIG. 4 is a side view of a frame that supports a boom.
FIG. 5 is a side view of a left support base, a mounting bracket, and a boom support body (main frame).
FIG. 6 is a plan view of a left support base, a mounting bracket, and a boom support body (main frame).
FIG. 7 is a front view of a left support base, a mounting bracket, and a boom support body (main frame).
FIG. 8 is an overall side view of the boom.
9A is a plan view of the front side of the left boom, FIG. 9B is a view taken along the line AA in FIG. 8, FIG. 9C is a view taken along the line BB in FIG. It is CC arrow directional view of FIG.
FIG. 10 is a side sectional view of a rear end portion of a boom.
FIG. 11 is a rear view of the rear end portion of the boom.
FIG. 12 is a diagram showing the left and right side wall portions and the upper wall portion of the rear end portion of the boom in an expanded state.
FIG. 13 is a side sectional view of the front guard.
FIG. 14 is a front view of the front guard.
[Explanation of symbols]
2 Tractor 3 Front loader 51 Front guard 52 Side frame member 53 Horizontal frame member 55 Mounting portion 56 Connecting plate 57 Connecting plate

Claims (3)

The rear lower part of the front guard (51) protecting the front of the front grille of the tractor (2) is attached to the front axle frame (5),
The front guard (51) includes left and right side frame members (52, 52) that are long in the vertical direction on the front side of the front grille, and a horizontal frame that is installed at least above the left and right side frame members (52, 52). A frame member (53), and front and rear connecting plates (56, 57) installed between lower portions of the left and right side frame members (52, 52);
The front guard device for a tractor, wherein the front and rear connecting plates (56, 57) constitute a mounting portion (55) for detachably mounting a weight (W). The left and right side frame members (52, 52) have a main portion (52a) extending in the vertical direction and a rear extending portion (52b) extending rearward from the lower end of the main portion (52a). The front guard device for a tractor according to claim 1, wherein a mounting plate (54) attached to the front axle frame (5) is fixed to a rear end portion of the portion (52b) . The front connection plate (56) is disposed vertically on the front end of the left and right side frame members (52, 52) to form a weight (W) locking portion, and the rear connection plate (57). The tractor according to claim 2 , wherein the tractor is disposed laterally so as to abut the front surface of the mounting plate (54) and forms a receiving portion for receiving the rear portion of the weight (W) from above. Front guard device.

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