JP2007312728A - Coupling device for implement of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling device for implements of a working vehicle, which includes a top link, a lower link and a check chain, wherein a support shaft pivoting a base part of the lower link and the check chain is simply composed and attaching and detaching of the lower link and the check chain are facilitated. <P>SOLUTION: The base parts of lower links 12L and 12R are fit onto the base part of a supporting shaft 17 fixed on rear axle cases 15L and 15R of the rear part of a machine body, a bracket 19 having a pipe body 19a fit onto an approximately intermediate part of the supporting shaft 17 outside the lower links 12L and 12R is provided, the base part of the bracket 19 is fixed to the rear axle cases 15L and 15R, and the bases of check chains 16L and 16R are fit onto the end of the supporting shaft 17 projecting outside the pipe body 19a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work machine coupling device provided at a rear portion of a work vehicle such as an agricultural tractor.

  Conventionally, at the rear of an agricultural tractor as a work vehicle, a three-point link device comprising a top link and left and right lower links is provided as a work machine connection device. A work machine such as a rotary tiller or a plow is connected, and the left and right lift arms are connected to the left and right lower links via lift rods so that the work machine can be raised and lowered.

Furthermore, a check chain that connects the agricultural tractor body and the middle part of the left and right lower links is provided, and the expansion amount of the left and right lower links can be adjusted by the check chain according to the change in the mounting form depending on the type and type of work equipment. It is known that the check chain can be adjusted and the left and right lower links can be prevented from swinging, that is, the swinging of the working machine can be restricted (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 55-180310 (page 2-5, FIG. 1)

  The bases of the left and right lower links and the check chain in Patent Document 1 are formed between a plate-like fixing member that is screwed to the distal end side small diameter portion of the rear axle case, and the fixing member and the base side large diameter portion of the rear axle case. Is supported by a support shaft provided in The support shaft is inserted into a through hole provided in the fixing member, and the tip thereof is inserted into the support hole of the rear axle case, and the support shaft and a cylindrical body fitted around the support shaft are connected by a pin. The support shaft is prevented from coming off.

  However, in order to pivotally support the left and right lower links and the check chain base with the support shaft described above, a sufficient space behind the support shaft is required, and the rear axle case has a small-diameter portion on the front end side. When the gap with the rear wheel is narrow, that is, when a wide tire such as a turf tire is mounted on the rear wheel, it cannot be adopted.

  The present invention was devised with the object of solving the above-described problems. In a work machine connection device for a work vehicle having a top link, a lower link, and a check chain, a base portion of a support shaft fixed to a rear axle case at the rear of the machine body. And a bracket provided with a pipe body that is externally fitted to the intermediate portion of the support shaft outside the lower link, the base portion of the bracket is fixed to the rear axle case, and the pipe body The base of the check chain is externally fitted to the tip of the support shaft that protrudes outward.

  According to the present invention, there is provided a bracket having a pipe body that externally fits the base portion of the lower link to the base portion of the support shaft fixed to the rear axle case at the rear portion of the airframe, and fits to the substantially intermediate portion of the support shaft outside the lower link. The base portion of the lower link and the check chain is provided by attaching the base portion of the bracket to the rear axle case, and by fitting the base portion of the check chain to the distal end portion of the support shaft that protrudes to the outside of the pipe body. The lower link and the check chain can be easily attached to and detached from the support shaft without inserting or removing the support shaft. Effective for tractors. In addition, since the substantially intermediate portion of the support shaft is supported by the bracket, the bending moment acting on the support shaft can also be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of an agricultural tractor 1 to which the present invention is applied. The agricultural tractor 1 includes an engine (not shown) in a hood 5 having left and right front wheels 2, 2 and rear wheels 3, 3. It is mounted in a state of being covered with, and a steering unit 8 including a steering wheel 6 and a seat 7 is provided on the rear side thereof. Further, as a ROPS at a rear position of the seat 7, a portal shape is projected in front view protruding upward from the body 4 The safety frame 9 is provided.

  FIG. 2 is a bottom view of the three-point link type work machine coupling device 10 provided in the agricultural tractor 1. The three-point link type work machine coupling device 10 includes a top link 11 and left and right lower links 12L, 12R, lift rods 13, 13 and the like.

  Rear axle cases 15L and 15R are integrally fixed to the left and right sides of the transmission case 14 constituting the rear part of the vehicle body 4 of the agricultural tractor 1, and a hydraulic housing case (not shown) is mounted on the upper side of the transmission case 14. It is location. Further, lift arms are attached to both sides of a lift shaft pivoted on the hydraulic housing case, and lift rods 13 and 13 are connected to the ends of the lift arms, and lower ends of the lift rods 13 and 13 are connected to left and right lower links. It is connected to the midway part of 12L and 12R.

  A base portion of the top link 11 is swingably attached to the rear portion of the hydraulic housing case so that a desired working machine can be attached (connected) to the top link 11 and the distal ends of the left and right lower links 12L and 12R. It has become. In addition, the lift arm is configured to be vertically rotatable through a lift cylinder (not shown) incorporated in the hydraulic housing case, and the left and right lower links 12L and 12R are vertically swung through lift rods 13 and 13 connected to the lift arm. As a result, the working machine moves up and down.

  Further, the three-point link type work machine connecting device 10 includes left and right check chains 16L and 16R that connect the machine body 4 and the middle portions of the lower links 12L and 12R in order to limit the left-right swing of the mounted work machine. I have.

  Specifically, as shown in FIGS. 2 and 3, a support shaft 17 provided with a mounting seat 17a is fixed in parallel to the axle 18 of the rear wheels 3 and 3 at the base-side large diameter portions of the rear axle cases 15L and 15R. Screwed). Then, a pipe joint 19a that externally fits a ball joint, which is a base part of the lower links 12L and 12R, to the base side of the support shaft 17 and is externally fitted to a substantially intermediate part of the support shaft 17 outside the lower links 12L and 12R; A bracket 19 comprising a plate-shaped fixing member 19b formed integrally with the pipe body 19a is provided, and a base portion of the bracket 19 is fixed to the rear axle cases 15L and 15R, and a support shaft that protrudes outside the pipe body 19a. The bases of the check chains 16L and 16R are externally fitted to the distal end portion of 17. Reference numeral 20 in the figure denotes a lynch pin that is fitted in the radial direction of the support shaft 17 provided to prevent the check chains 16L and 16R connected to the tip of the support shaft 17 from coming off.

  That is, as shown in FIG. 4, the base portions (ball joints) of the lower links 12L and 12R that are fitted on the support shaft 17 by the stepped portion B formed on the inner end surface A of the pipe body 19a and the base side of the support shaft 17 described above. ) And the base portion of the check chains 16L and 16R are externally fitted between the outer end face C of the pipe body 19a and the lynch pin 20, so that the lateral positions of the base portions of the check chains 16L and 16R are Can be regulated.

  According to the above-described configuration, the lower links 12L, 12R and the lower shafts 12L, 12R and the lower shafts 12L, 12R can be connected to the support shaft 17 of the present embodiment without inserting / removing the support shafts that pivotally support the base portions of the lower links 12L, 12R and the check chains 16L, 16R. The check chains 16L and 16R can be easily attached and detached, especially for a tractor equipped with a wide tire such as a turf tire in which the clearance between the small diameter portion of the rear axle case 15L and 15R and the rear wheels 3 and 3 is narrowed. It is valid. Further, since the substantially intermediate portion of the support shaft 17 is supported by the bracket 19, the bending moment acting on the support shaft 17 can also be reduced.

  Further, when attaching a working machine such as a backhoe or a trailer to a traction device (drawer) (not shown) provided at the rear part of the body 4 of the agricultural tractor 1, lower links 12L and 12R that are externally fitted to the support shaft 17 and checked The chains 16L and 16R can be easily removed.

  In addition, by integrally forming the pipe body 19a and the plate-like fixing member 19b which are the constituent members of the bracket 19, the number of parts can be reduced and the parts can be prevented from being lost when the bracket 19 is attached or detached.

  FIG. 5 is a perspective view showing the periphery of a resin front grille 21 that covers the front of the engine of the agricultural tractor 1. The front grille 21 has a wide outside air with a net stretched on the front lower part thereof. An intake 21a is provided. Further, a headlamp unit 22 is provided on the front upper portion of the front grille 21. The bonnet 5 is provided above the front grille 21 and the left and right side covers 23 that cover the sides of the engine, and an outside air intake port in which a net is stretched on the tip of the bonnet 5, that is, on the headlamp unit 22. 5a is provided.

  In addition, work lights that illuminate the sides of the front wheels 2 and 2 of the agricultural tractor 1 can be mounted on both the left and right sides of the headlamp unit 22, but when heat balance is given priority, work lights are mounted. If the outside air intake 21b is configured by stretching a net as shown in the figure, the heat balance can be further improved.

A side view of an agricultural tractor. The bottom view of the three-point link type work machine connection device with which an agricultural tractor is equipped. The perspective view which shows the connection structure of a lower link and a check chain. The perspective view which abbreviate | omitted one part which shows the attachment structure of a support shaft and a bracket. The perspective view which shows the periphery of a front grille.

Explanation of symbols

11 Top link 12L Lower link (left)
12R Lower link (right)
15L Rear axle case (left)
15R Rear axle case (right)
16L check chain (left)
16R Check chain (right)
17 Support shaft 19 Bracket 19a Pipe body

Claims (1)

  In a work machine connection device for a work vehicle having a top link (11), a lower link (12L, 12R) and a check chain (16L, 16R), a support shaft (17) fixed to a rear axle case (15L, 15R) at the rear of the machine body The bracket (19a) includes a pipe body (19a) that fits the base portion of the lower link (12L, 12R) to the base portion of the support shaft (17) outside the lower link (12L, 12R). 19), the base of the bracket (19) is fixed to the rear axle case (15L, 15R), and the check chain (16L) is attached to the tip of the support shaft (17) protruding outside the pipe body (19a). , 16R). A work machine coupling device in a work vehicle characterized by externally fitting a base portion.

Images