JP2016135942A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle equipped with a connection bracket to which a front work device and a partition and the like can easily attached with a simple and rigid structure.SOLUTION: A connection bracket 13 to which a front work device 15 can be attached is made a single structure by integrating: a thick plate-like bracket body 13a which connects a rear part of an engine support frame 10 to a lower part of a clutch housing 11; a horizontal support cylinder part 13b which protrudes toward an outer side from a middle part of the bracket body 13a; and a partition bracket 13d which protrudes from a cylinder middle part of the horizontal support cylinder 13b and to which a lower part of a partition 16 erected between a bonnet 6 and a dash board 7b can be attached. A bracket 13c for the device to which the front work device 15 can be attached is integrally formed on an end side of the horizontal support cylinder 13b.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a work vehicle such as a tractor on which a front work device such as a front loader, an excavator, a rake, or a drilling machine is mounted via a connection bracket.

Conventionally, the rear part of the engine covered with a bonnet, the front part of the clutch housing and the engine support frame (front axle bracket) or the rear part of the engine base fixed in the front-rear direction along the left and right lower parts of the engine, A tractor for connecting the left and right lower portions of the clutch housing with a loader support bracket (connection bracket) to which a front loader can be attached is already known. (For example, see Patent Document 1)
The left and right loader support brackets of the tractor are formed of angle members, and have a mounting portion for attaching and detaching the loader frame on the upper surface thereof, and a mounting piece that can be bolted to the rear end of the engine support frame on the inside And an attachment piece that is attached to the outer side surface of the clutch housing by bolting. In addition, the loader support bracket includes a reinforcing structure that connects the upper end portion with a rear plate on the upper side of the clutch housing via a connecting plate by bolting and the like, and a connecting rod that passes between the mounting pieces on the lower end portion through the lower side of the clutch housing. It is the structure supported by the reinforcement structure to connect.

JP 2003-328382 A

  Since the tractor shown in Patent Document 1 is always equipped with loader support brackets on the left and right sides of the traveling machine body (vehicle body) in advance, when a front work is required, the front loader or the like can be immediately attached to perform the work. There are advantages. However, a loader support bracket formed of an angle member is a thick-walled iron plate for integrating the mounting portion and the mounting piece for the connection bracket and the mounting piece to be attached to the outer surface of the clutch housing by bolting. In addition to forming by pressing, it requires welding work for parts that are difficult to integrally press, which necessitates complicated parts manufacturing processes and processing techniques, and increases the cost. There exists a subject which requires various reinforcement essential parts, such as connecting with the connecting rod which passes below.

The present invention that solves the above-mentioned problem firstly connects the rear part of the engine 5 covered with the bonnet 6 and the front part of the clutch housing 11 in which the dashboard 7b of the control part 7 is disposed above the engine 5. In the work vehicle 1 in which the rear part of the engine support frame 10 fixed in the front-rear direction along the left and right lower parts of 5 and the left and right lower parts of the clutch housing 11 are connected by a connection bracket 13 to which a front work device 15 can be freely attached.
A thick plate-like bracket main body portion 13a for connecting the connection bracket 13 to the rear portion of the engine support frame 10 and the lower portion of the clutch housing 11, and a cylinder projecting outward from the middle portion of the bracket main body portion 13a. Shaped horizontal support cylinder 13b, and a bulkhead protruding from the middle part of the horizontal support cylinder 13b toward the rear side, and the lower part of the partition 16 standing between the bonnet 6 and the dashboard 7b being attachable The device bracket 13c is integrally formed with the unit bracket 13d, and the device bracket 13c that allows the front working device 15 to be attached to the end side of the lateral support cylinder portion 13b is integrally formed. It is a feature.
Secondly, the connection bracket 13 is a casting manufactured by a casting means to form a single structure.

According to the first aspect of the present invention, the connection bracket for connecting the rear side of the engine of the work vehicle and the front side of the clutch housing so that the front working device can be freely attached is provided between the rear part of the engine support frame and the clutch housing. A thick plate-like bracket main body connecting the lower part, a cylindrical horizontal support cylinder projecting outward from the middle part of the bracket main body part, and a rear side from the middle cylinder part of the horizontal support cylinder part The partition wall bracket that protrudes toward the side and that allows the lower part of the partition wall standing between the bonnet and the dashboard to be freely mounted is integrated into a single structure, and the end of the horizontal support cylinder portion. By integrally forming the bracket for the device that allows the front work device to be freely mounted on the part side,
The connecting bracket is simple and manufactured while synergistically increasing the strength of the two parts, since the base of the large-diameter horizontal support cylinder is integrated into the middle part of the thick-walled bracket body and protrudes into a T-shape in plan view. It is possible to make a rigid structure that is easy to perform, and it is possible to stably attach and support the front working device and the partition wall without causing deformation. The connection brackets attached to the lower portions on both sides of the clutch housing can easily attach the partition wall via the partition wall bracket in the middle part of the horizontal support cylinder part, and the front working device is installed on the outer end of the horizontal support cylinder part. It can be easily and efficiently mounted via the bracket.
According to the invention which concerns on Claim 2, the said connection bracket becomes the casting manufactured by the casting means, and makes it a single structure, The connection bracket consisting of a casting becomes a bracket main-body part and an apparatus bracket. And the partition wall bracket can be manufactured easily and accurately with high accuracy, and the accuracy can be maintained without distortion or the like in each bracket and each mounting part even in long-term use. In addition, the horizontal support cylinder part has a predetermined thickness and can easily form a hollow hole in the horizontal axis direction inside, so that the outer diameter can be reduced while saving the material and weight of the cast member. In particular, the connection bracket can be a rigid structure with a large diameter and a high strength.

It is a left view of a tractor provided with a connection bracket. It is an enlarged side view which shows the installation structure of the left side connection bracket. It is a perspective view which shows the attachment structure of the left side connection bracket. It is a perspective view which shows the left side connection bracket. It is a top view of the connection bracket of FIG. It is a side view of the principal part which shows the fender structure which covers the rear-wheel of a small diameter tire.

  An embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an agricultural tractor shown as an example of a work vehicle. A traveling machine body 3 having a front wheel 2 and a rear wheel 2a in front, rear, left and right is mounted with an engine 5 from the front side and covered with a bonnet 6, and behind that A steering unit 7 including a handle 7a, a dashboard 7b, a steering step unit 7c, a driver's seat 7d and the like is disposed and covered with a cabin 8, and a three-point link mechanism including a lower link, a top link, a hydraulic cylinder, and the like at the rear of the body. 9 is provided. As a result, the tractor 1 can freely attach various rear working machines such as a tilling work machine to the three-point link mechanism 9, and the tilling work is performed by the expansion and contraction operation of the hydraulic cylinder connected to the hydraulic operating equipment installed on the traveling machine body 3 side. Work on the ground while supporting the machine etc. up and down freely.

  The traveling machine body 3 of the tractor 1 includes left and right engine support frames 10 that are bolted to both lower sides of the engine 5 to support the front wheels 2, a clutch housing 11 that is detachably connected to the rear portion of the engine 5, Connected to the clutch housing 11, the rear wheel 2a is pivotally supported at the rear of the case, and a vehicle body frame is formed by a transmission case (transmission case) 12 or the like that constitutes a transmission body for performing a speed change operation.

  Further, the traveling body 3 connects the rear portions of the left and right engine support frames 10 and the front left and right portions of the clutch housing 11 with the respective symmetrical connection brackets 13 according to the present invention, thereby achieving a rigid body structure of the vehicle body frame. ing. The connection bracket 13 has a single structure, and a partition that supports a work machine mounting member on which a front working device 15 such as a front loader can be mounted, and a partition 16 interposed between the bonnet 6 and the dashboard 7b. Simplification of the fuselage structure and cost reduction are possible by using the mounting member and the like.

  As shown in FIGS. 1 to 3, the partition wall 16 includes a partition frame 16 a formed in an inverted U shape along the contour of the bonnet 6, and a partition plate that is stretched in the partition frame 16 a and closes the rear portion of the engine room. The dashboard 7b, which is formed so as to surround the column post of the handle 7a, can be attached in a state of being attached to the left and right connection brackets 13 and standing upright. Further, at the left and right lower portions of the partition wall frame 16a, there are an attachment portion 16c for attaching to the connection bracket 13, and an attachment portion 16e for attaching the front portion of the control portion bottom frame 18 (control step portion 7c) via a vibration isolation member 16d. Provided. (Figure 2)

  Here, the front work device 15, the steering step portion 7c, the driver's seat portion, the steering portion bottom frame 18 that forms the fender 17 that covers the left and right rear wheels 2a, and the cabin 8 will be described. First, as shown by a two-dot chain line in FIG. 1, the front working device 15 includes a base side of an arm 15a having a working portion (not shown) such as a bucket at the tip, and a hydraulic cylinder 15b that controls the vertical movement of the arm 15a. The base portion side is a unit structure pivotally supported on the left and right device frames 19. Accordingly, the front work device 15 is manufactured and distributed as an attachment type work machine for various tractors. The front working device 15 according to the embodiment is a front loader, and is bolted in a state where the lower end portion of the device frame 19 is placed on the upper portion of a mounting base 20 that is installed and erected on the connection bracket 13 as will be described later. It is detachably attached by attachment means such as. Further, the hydraulic actuator such as the hydraulic cylinder 15b is connected to the hydraulic equipment on the traveling machine body 3 side, and is configured to be operated from the control unit 7 side.

  The control unit bottom frame 18 is formed by pressing a control step unit 7c, a seat frame that supports the driver's seat 7d, and mounting surfaces for attaching the left and right fenders 17 on both sides of the seat frame, as in the conventional case. The bottom frame main body is configured by forming a series of the above and the like. The steering unit bottom frame 18 is mounted and supported by a structure to be described later on a partition frame 16a extending downward from the partition wall 16 at the front left and right, and the rear part is mounted on the rear transmission case side of the transmission case 12, respectively. It is attached and supported in a state where it is placed through a vibration-proof structure such as a formula.

  On the other hand, as shown in FIGS. 1 and 6, the control unit bottom frame 18 of this embodiment is manufactured by attaching the left and right fenders 17 separately to the bottom frame body, and the mounting positions of the fenders 17 are vertically and longitudinally. It is designed to be freely adjustable. As a result, the tractor 1 adjusts the position of the fender 17 without changing the bottom frame body of the control unit bottom frame 18 as in the conventional case when the rear wheels 2a having different tire diameters are mounted. The distance from the tire outer periphery is properly maintained and covered, and the cabin 8 is easily installed.

That is, as shown in FIG. 1, the fender 17 has a vertically-oriented flat plate mounting plate portion 17a and a tire cover that protrudes outward from the upper side portion along the tire outer peripheral surface and covers the upper portion of the rear wheel 2a. The mounting plate portion 17a is formed with a plurality of mounting holes 17c and a plurality of vertically long mounting holes 17d on its front and rear surfaces. As a result, the fender 17 has a predetermined mounting hole 17c and a mounting hole from the mounting position shown in FIG. 1 to the arcuate fender frame 18a side or the vehicle body side formed on both sides of the bottom frame body of the control unit bottom frame 18. 17d can be selected and fastened with a bolt 17e. Thereby, as shown in FIG. 6, when the rear wheel 2a of the small-diameter tire is mounted instead of the large-diameter tire, the fender 17 covers the tire outer periphery of the rear wheel 2a with a predetermined covering interval. it can. Therefore, the tractor 1 having the above-described fender mounting structure is prepared to manufacture the control unit bottom frame 18 including the fenders 17 corresponding to the positions of the rear wheels 2a having different vehicle body sizes and tire diameters as in the conventional tractor. In addition, a plurality of types of control unit bottom frames 18 can be easily and inexpensively manufactured by changing the mounting position of the fender 17 by using the bottom frame body that is the basis of the control unit bottom frame 18 as well as various tire diameters. This can correspond to the rear wheel 2a.

  On the other hand, the cabin 8 installed in the traveling machine body 3 has a box shape similar to a conventional one, and a cabin frame 8a composed of front and rear, left and right columns and upper and lower horizontal frames connecting the upper and lower sides of each column, A ceiling board is stretched on the upper surface, windows are provided on the front and rear surfaces, and a door 3b that can be opened and closed on the left and right surfaces is used as a fulcrum to form a cabin room of a three-dimensional structure. As a result, the cabin 8 is placed along the outer peripheral contour of the bottom frame body of the control unit bottom frame 18 so as to surround the entire control unit 7 from above, and the lower part of the cabin frame 8 a is placed on the bottom frame of the control unit bottom frame 18. The main body and the traveling machine body 3 are positioned and fixed and assembled at predetermined locations. At this time, the lower edge of the front window portion of the cabin 8 is in a fitted state along the outer peripheral shape of the partition wall 16, and the cabin room is made airtight through a seal member inserted between the two.

  Further, when the lower frame of the cabin frame 8a is to be shared with the plate-like control unit bottom frame 18, the cabin 8 can be configured as a cabin with the same structure as the fender mounting structure. The outer periphery of the rear wheel 2a with different tire diameters can be covered with an appropriate distance by simply changing the mounting position of the fender 17 without changing the support frame, the bottom frame body of the control unit bottom frame 18 and the door 8b. Can do. Accordingly, the bottom frame body of the basic cabin 8 can be manufactured without manufacturing the various cabins 8 in which the position of the fender 17 is fixedly configured for each rear wheel 2a having a different vehicle body size and tire diameter, unlike the conventional one. The cabin 8 can be configured in a simple and inexpensive manner while also serving as the fender 17. The fender mounting structure is not limited to the above-mentioned means. For example, a fender unit frame composed of a fender 17 having different sizes and shapes and a fender mounting piece is provided on both sides of the rear part of the bottom frame body of the control unit bottom frame 18. The rear wheel 2a may be configured to be detachable and replaceable according to the tire diameter. In this case, the same effect can be obtained.

  Next, the connection bracket 13 will be described with reference to FIGS. The connecting bracket 13 shown in the figure is provided with a cylindrical horizontal support cylinder 13b projecting in the middle in the front-rear direction of the bracket main body 13a so as to become a rigid single structure casting by casting means made of cast iron. It has a T shape in a plan view, and has a hook-like device bracket 13c at the side end of the horizontal support cylinder 13b, and a mounting portion of the partition wall 16 from the middle of the cylinder of the horizontal support cylinder 13b toward the rear side. A partition wall bracket 13d that is brought into surface contact with 16c is integrally projected.

  The cast connection bracket 13 thus cast is subjected to each cutting finishing process on the front and rear mounting surfaces of the bracket body portion 13a, the mounting surface of the device bracket 13c, and the mounting surface of the partition wall bracket 13d. An appropriate number of mounting holes 25 and bolt holes 25a are drilled at predetermined positions on the surface. As a result, the connection bracket 13 can improve the mounting accuracy with each mounting part without causing distortion and the like, and can be a single-structured finished part that does not cause distortion or deformation even after long-term use. can do.

  In addition, the connection bracket 13 of the embodiment integrates the base portion of the large-diameter lateral support cylinder portion 13b from the middle portion of the thickened bracket main body portion 13a so as to protrude in a T shape in plan view, and synergistically combines the strength of both. I try to increase it. As a result, the connection bracket 13 can be compared to a steel plate made even when a large load is applied to the lateral support cylinder 13b protruding in a cantilevered manner from the bracket body 13a in the vertical and longitudinal directions via the device bracket 13c. Thus, the cantilever support member can be easily bent without causing deformation. Further, since the horizontal support cylinder portion 13b has a predetermined thickness and can easily form the hollow hole 13e in the horizontal axis direction inside, the outer diameter can be reduced while saving the material and weight of the cast member. Since the diameter can be made as large as possible, the connection bracket 13 can have a rigid structure with high strength. The connection bracket 13 in the illustrated example is manufactured by a conventional casting method that has strength and can be manufactured easily and inexpensively. However, the present invention is not limited to this, and other manufacturing means may be selected. Good.

Next, referring to FIGS. 2 and 3, the usage mode and operation of the connection bracket 13 will be described.
First, the connection work of the connection bracket 13 is performed in a state where the engine 5 and the clutch housing 11 are connected by fastening a large number of bolts and the engine support frame 10 is attached to the engine 5. At this time, the connection bracket 13 abuts the front mounting surface of the bracket main body portion 13a on the end surface of the block-shaped mounting piece 10a protruding from the engine support frame 10 to the side, and the rear mounting surface. After making contact with the end surface of the mounting portion 11a of the clutch housing 11, and then aligning the mounting holes 25 with the bolt holes of the mounting piece 10a and the mounting portion 11a, the bolts 26 are inserted and tightened.

  As a result, the left and right connection brackets 13 have the bracket body portion 13a firmly reinforcing and connecting the engine 5 and the clutch housing 11 to enhance the rigid structure of the traveling machine body 3, and the connection bracket 13 itself is also firmly attached and supported on the machine body side. It will be in the state. Therefore, the connection bracket 13 is strong against a large load load in the vertical and front-rear directions, which is applied to the tip of the horizontal support cylinder portion 13b that protrudes from the bracket body portion 13a with a long span outward. And can be stably supported.

  Next, the partition wall 16 is inserted into the connection bracket 13 attached as described above so as to straddle the rear upper portion of the clutch housing 11. In this case, the partition wall 16 is fastened to the bolt hole 25a by inserting the bolt 26 from behind with the mounting portion 16c of the partition frame 16a being in contact with the partition wall bracket 13d as shown in FIG. Thereby, the left and right ends of the partition frame 16a are joined to the mounting portions 16c of the left and right horizontal support cylinder portions 13b, and the partition wall 16 is supported stably and firmly in a standing posture having a wide left and right width (horizontal span). The dashboard 7b can be easily and reliably attached.

  Further, the connection bracket 13 supports the horizontal support cylinder part 13b in which the partition wall 16 protrudes from the upper side in a suspended state when the weight of the front working device 15 and a load during operation are applied to the horizontal support cylinder part 13b. It functions as a stay member that supports the downward load in a distributed manner, and the lateral support cylinder portion 13b can be reinforced with a simple configuration. Next, by attaching the front portion of the step frame 18 to the mounting portion 16e of the partition wall frame 16a through the vibration isolating member 16d in the above configuration, the mounting of each component to the connection bracket 13 is completed, and the tractor 1 is completed. be able to.

  In the mounting operation of the step frame 18, the length between the partition wall brackets 13 d of the connection bracket 13 paired on the left and right (the left and right connection width) and the front side width of the step frame 18 are substantially the same. The attachment of the partition wall 16 to the front and the front side of the step frame 18 can be performed easily and easily from the outside of the connection bracket 13 without inserting a hand into the lower back side of the step frame 18. Further, according to the mounting structure, the connection bracket 13 faces the substantially entire length of the horizontal support cylinder portion 13b from the front lower side of the left and right front end portions of the step frame 18 in close proximity. As a guard member having a protector action, there is a feature that it can be used without interfering with the field of view.

  Next, a working mode and configuration of mounting the front working device 15 on the tractor 1 having the above configuration will be described. First, the mounting base 20 is positioned in contact with the device bracket 13c of the left and right connection brackets 13 from the outside in a predetermined posture, and the bolts 27 are inserted into the mounting holes 20a and inserted into the bolt holes 23 and tightened. Since the mounting base 20 is in a standing posture from the device bracket 13c, the mounting can be easily completed. Next, the device frame 19 of the front working device 15 is placed on the upper portion of the mounting base 20 erected on the left and right, and is attached by bolts or pins. Thereafter, the actuator such as the hydraulic cylinder 15b of the front working device 15 and the hydraulic equipment on the traveling machine body 3 side are piped to complete the mounting of the front working device 15.

  As a result, the worker operates the front work device 15 from the control unit 7 and performs a target work such as a loader work. Further, after the front work is completed, the front work device 15 can be easily removed by the reverse work. At this time, the connection bracket 13 shows a state in which the mounting base 20 that is a constituent member of the front working device 15 is removed from the device bracket 13c and a state in which the mounting bracket 20 is still attached to the device bracket 13c. However, the selection corresponding to the usage plan of the tractor 1 can be easily performed. That is, the operator performs the rear work with the mounting base 20 attached when the front work frequency is very low and the rear work is performed with the mounting base 20 removed.

  That is, when the tractor 1 including the connection bracket 13 performs rear work or traveling with the mounting base 20 mounted, the mounting base 20 made of a plate member standing upright on the side of the step frame 18 is Since a large space is formed between the hood 6 and the bonnet 6, there is an advantage that various operations can be performed without hindering the mounting base 20 from obstructing the front view from the control unit 7. Further, the device bracket 13c or the mounting base 20 located on the outer side of the front portion of the step frame 18 is, for example, a work such as a guard member for guarding the machine side, a carrier bed for transportation, or an arm of a sanding board working machine. As a mounting member for attaching the member, it can be used with convenience.

  Further, the hollow hole 13e of the connection bracket 13 can be used as an attachment auxiliary portion for inserting and supporting an attachment projection member protruding inward from the attachment base 20 or the work member. Further, since the horizontal support cylinder 13b faces in the laterally extending state in the front frame extending direction of the step frame 18, it can be used as a stepping platform, so that maintenance work in the engine room, cleaning of the hood 6 and the cabin 8, etc. There is a feature that it can be easily performed.

1 Tractor (work vehicle)
DESCRIPTION OF SYMBOLS 3 Traveling machine body 5 Engine 6 Bonnet 7 Steering part 7b Dashboard 10 Engine support frame 11 Clutch housing 13 Connection bracket 13a Bracket main body part 13b Side support cylinder part 13d Bulkhead bracket 15 Front work device 20 Mounting base (working machine mounting member)

Claims (2)

The rear part of the engine (5) covered with the bonnet (6) and the front part of the clutch housing (11) in which the dashboard (7b) of the control part (7) is arranged are connected, and the engine (5) The rear part of the engine support frame (10) fixed in the front-rear direction along the left and right lower parts of the clutch and the left and right lower parts of the clutch housing (11) are connected by a connection bracket (13) to which the front working device (15) can be attached. In the work vehicle (1) to be connected,
The connection bracket (13) includes a thick plate-like bracket body (13a) for connecting the rear portion of the engine support frame (10) and the lower portion of the clutch housing (11), and a halfway of the bracket body (13a). A cylindrical lateral support cylinder portion (13b) projecting outward from the portion, and projecting from the middle portion of the lateral support cylinder portion (13b) toward the rear side, the bonnet (6) and the dashboard (7b) And a partition wall bracket (13d) that can be freely attached to the lower portion of the partition wall (16), and is integrated into a single structure, and the end of the horizontal support tube portion (13b). A work vehicle characterized in that an apparatus bracket (13c) is formed integrally on the part side so that the front work apparatus (15) can be freely attached.   The work vehicle according to claim 1, characterized in that the connection bracket (13) is a casting produced by casting means to form a single structure.

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