JP2005306156A - External oil pressure takeout device of agricultural tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external oil pressure takeout device for an agricultural tractor as improvement of the conventional arrangement in which connectors of a so-called external oil pressure takeout device to supply the oil pressure to a working machine are installed around a cylinder case fitted with a lift arm and which involves such problems that a link mechanism etc. constitutes obstacle and the mounting and removing operations of a hydraulic hose are troublesome. <P>SOLUTION: A left 16a and a right stay 16b are installed upright behind a maneuvering seat 13 positioned in the rear of the tractor, and the tops of the stays are connected together by a frame 16c stretching in the horizontal direction. The frame 16c is furnished with brackets 32A and 32B, which are mounted removably for holding a plurality of connectors 33A and 33B for taking out the external oil pressure. The brackets are provided in a plurality of pieces for each hydraulic actuator of an external working machine. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a configuration of an external hydraulic pressure take-out device for an agricultural tractor.

2. Description of the Related Art Conventionally, agricultural tractors are configured to include a so-called external hydraulic pressure take-out device for connecting a work machine according to various works and supplying hydraulic pressure to a hydraulic actuator provided in the work machine. In this external hydraulic pressure take-out device, a configuration is known in which various hydraulic valves and external hydraulic pressure take-out connectors are centrally arranged around the hydraulic case at the rear of the machine body. For example, in JP-A-11-59211, a valve plate is placed on the upper surface of the hydraulic case, and a lift arm at the rear of the machine body is hydraulically driven on the plate to change the height of the work machine. A configuration is provided in which a plurality of hydraulic valves and a plurality of hydraulic valves that extract hydraulic pressure to a working machine attached to a tractor are stacked in the vertical direction (Patent Document 1).
JP 11-59211 A

  In the prior art, since the hydraulic valve for taking out the hydraulic pressure to the work implement side and this connector are arranged in the left and right lift arms below the cockpit, in the general tractor having a link mechanism at the rear of the vehicle body, the link mechanism There is a problem that the operation is troublesome, for example, it becomes necessary to bend the posture and handle the hydraulic hose.

  In order to solve the above problems, the present invention has taken the following technical means.

  According to the first aspect of the present invention, left and right struts (16a, 16b) are erected on the rear side of the cockpit (13) disposed at the rear of the vehicle body, and a horizontal frame is formed between the upper ends of the left and right struts (16a, 16b). Agricultural machinery characterized in that it is connected by a body (16c) and has a detachable bracket (32A, 32B) for holding a plurality of connectors (33A, 33B) for taking out external hydraulic pressure to the frame (16c) A tractor external hydraulic pressure takeout device was used.

  According to the configuration of the first aspect, the support pillars (16a, 16b) are erected on the rear part of the agricultural tractor so as to be located behind the cockpit (13), and are connected between the left and right support pillars (16a, 16b). A bracket (32A, 32B) is detachably attached to the horizontal frame (16c), and a plurality of connectors (33A, 33B) for taking out external hydraulic pressure are held by the bracket (32A, 32B). .

  In the invention according to claim 2, a plurality of the detachable brackets (32A, 32B) are provided for each pair of connectors (33A, 33B) for supplying and discharging hydraulic pressure to a hydraulic actuator of a work machine (G) attached to the tractor. The external hydraulic pressure take-out device for agricultural tractors according to claim 1, wherein the external hydraulic pressure take-out device is provided.

  According to the configuration of the second aspect, the hydraulic pressure of the working machine (G) is supplied and discharged from the connectors (33A, 33B) held by the same bracket (32A, 32B).

  In the invention of claim 1 configured as described above, the external hydraulic pressure take-out connectors (33A, 33B) for communicating the hydraulic pressure to the work machine (G) are set at a high position such as the rear of the cockpit. Even when the (G) side hydraulic hose is connected, the attaching / detaching operation can be performed in an easy posture. The plurality of connectors (33A, 33B) can also be attached and detached collectively by removing the brackets (32A, 32B) from the frame body (16c), and the handleability is good.

  In the invention of claim 2, since the connector (33A, 33B) communicating with each hydraulic actuator is held by a single bracket (32A, 32B) for each hydraulic actuator, the maintenance of the hydraulic actuator or work Even when the specifications of the machine (G) are changed, the hydraulic actuator, the connectors (33A, 33B) and the pipes connected thereto can be attached and detached from the vehicle body as a unit, so that the handling is good.

  Hereinafter, an agricultural tractor provided with the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the agricultural tractor 1 includes an engine 3 between the left and right body frames 2 and 2 at the front of the vehicle body, and a front axle case 4 is attached to the lower side of the body frame 2 so as to be swingable around the center pivot. The left and right front wheels 5 and 5 are attached to both ends of the front axle case 4 via a steering case so as to be steerable, and the left and right front wheels 5 and 5 are steered by a steering handle 6.

  A clutch housing 7 and a transmission case 8 are sequentially connected to the rear portion of the engine 3, and left and right rear wheels 10 and 10 are provided on the left and right sides of the transmission case 9 via rear axle cases 9 and 9. Yes.

  The outer periphery of the engine 3 is covered with a bonnet 11, and a steering handle 6 is disposed above the rear part of the bonnet 11. A pilot seat 13 is provided between the fenders 12 and 12 above the mission case 8, and a step floor 14 is provided in front of the lower portions of the left and right fenders 12 and 12 so as to cover the upper side of the mission case 8.

  Further, at the rear part of the mission case 8, the lops 16 are erected from the left and right rear axle cases 9 so as to be positioned behind the cockpit 13.

  The lops 16 have a rear-view portal shape including left and right support columns 16a and 16b in the vertical direction and a horizontal frame 16c (frame body) that connects the upper ends thereof. It is configured to support a gate-type safety frame for preventing falls.

  Further, a hydraulic case 17 is provided at the rear upper part of the transmission case 8, lift arms 18 and 18 are pivotally supported on both sides of the hydraulic case 17, and a working machine elevating hydraulic cylinder (illustrated) is built in the hydraulic case 17. The lift arms 18 and 18 are configured to rotate up and down by a piston expansion / contraction (omitted).

  Further, a three-point link mechanism 19 comprising a top link 19u and left and right lower links 19l, 19l is provided at the rear part of the mission case 8, and the lower links 19l, 19l of the three-point link mechanism 19 and the lift arms 18, 18 are connected to each other. It connects with the lift rods 20 and 20, and becomes a structure which raises / lowers a rear work machine (illustration omitted). A PTO shaft 21 is provided on the rear surface of the transmission case 8 so that the rotation of the coaxial 12 is transmitted to the rear working machine (not shown) through the rotation of a universal joint connecting the PTO shaft 21.

  Next, the configuration of various hydraulic devices arranged on the tractor will be described.

  As shown in FIG. 1, the tractor 1 is provided with a hydraulic pump 22 in the vicinity of the engine 3, and the hydraulic pump 22 is driven by transmitting rotational power output from the engine 3. The hydraulic pressure discharged from the hydraulic pump 22 is controlled by various hydraulic control valves, and is sent to the hydraulic cylinder for raising / lowering the work implement in the hydraulic case 17 or the hydraulic actuator of the external work implement attached to the tractor 1.

  Next, the external work machine attached to the tractor and the external hydraulic pressure take-out configuration will be described.

  At the rear of the tractor 1, there are front and rear support frames (hereinafter referred to as a pre-work support frame 25 f and a rear support frame 25 r) for attaching an external work machine to the left and right rear axle cases 9 at the rear of the left and right posts 16 a and 16 b of the lops 16. The transmission case 8 is erected from the left and right side portions of the transmission case 8 and the upper end portions of the front, rear, left and right support frames 25f and 25r are connected to each other by a plate-like mounting table 26. Further, the upper surface of the mounting table 26 has a height substantially aligned with the upper surfaces of the left and right fenders 12 and 12.

  As shown in FIGS. 2 and 3, first and second hydraulic control valves 24A and 24B for taking out external hydraulic pressure are attached to the right side surface of the hydraulic case 17 so as to overlap with each other. The oil passages in the first and second hydraulic control valves 24A and 24 can be switched by the back-and-forth rotation operation of the first and second operation levers 30A and 30B projecting from the first and second operation levers 30A and 30B. Further, as shown in FIG. 4, hydraulic hoses 31A, 31B... For supplying and discharging hydraulic pressure from the control valves are connected to the upper surfaces of the first and second hydraulic control valves 24A, 24B.

  Thus, when the hydraulic pump 22 is driven, the discharged hydraulic pressure is sent to the first and second hydraulic control valves 24A and 24B, and the hydraulic hoses 31A and 31B according to the oil path switching operation inside the control valve. Hydraulic pressure is supplied and discharged from.

  Further, as shown in FIG. 5, a plate member 16d is supported by welding downward on the back surface of the horizontal frame 16c of the lops 16, and the left and right side portions of the plate 16d are upper portions of the left and right brackets 32A and 32B of the present invention. Is configured to be detachably attached with bolts and nuts. The brackets 32A and 32B have a configuration in which a lower portion thereof is extended toward the center of the vehicle body when viewed from the rear, and a plurality of external hydraulic pressure take-out connectors 33A and 33B are provided in the left and right directions in the lower portion of the left and right brackets 32A and 32B. It has become. In addition, a pipe connection portion is provided on the front side of the brackets of the connectors 33A and 33B so as to be connected to the front ends of the hydraulic hoses 31A and 31B connected to the first second hydraulic control valves 24A and 24B. It has a configuration.

  The left and right brackets 32A and 32B are configured as common parts having the same shape, and can be used as either left or right brackets by reversing the front and rear surfaces. The connectors 33A and 33A on the left and right sides (left side in FIG. 2) are configured to take out the hydraulic pressure supplied and discharged from the first hydraulic control valve 24A, and the connectors 33B and 33B on the left and right other sides (right side in FIG. 2) The hydraulic pressure supplied and discharged from the second hydraulic control valve 24B is taken out.

  Next, as an example of the external working machine of the present invention, a so-called grabber working machine G for picking up heavy crops such as pineapple and coconut will be described.

  A base column 34a is erected on the mounting table 26, and first and second arms 34b and 34c are connected in order to the upper end of the base column 34a, respectively, and the first and second hydraulic cylinders 36A and 36B, respectively. The second arm 34c is connected to the tip of the second arm 34c, and a grab bucket 34g that can be opened and closed is provided.

  A hydraulic hose connected to the pair of first connectors 33A, 33A is connected to a hydraulic supply / exhaust port of the first hydraulic cylinder 36A that moves the first arm 34b up and down, and a hydraulic hose connected to the second connectors 33B, 33B. The second arm 34b is connected to the hydraulic supply / exhaust port of the second hydraulic cylinder 36B that performs the refraction operation.

  Accordingly, when the first operation lever 30A is operated back and forth, the first hydraulic cylinder 36A is driven, and the vertical position of the second arm 34b and the grab bucket 34g can be operated. Further, when the second operation lever 30B is operated back and forth, the hydraulic cylinder 36B is driven first, the second arm 34b is refracted with respect to the first arm 34a, and the front and back position of the grab bucket 34g can be adjusted.

  The base column 34a is configured to turn around the vertical axis by an electric worm cylinder 35 with respect to the mounting table 27, and the grab bucket 34g is also configured to open and close by the expansion and contraction of the piston of the electric cylinder 38. The driving operation is performed by each operation member.

  Thus, the base 34a is swung forward and backward by the worm cylinder 35, the position of the bucket is adjusted by the first and second hydraulic cylinders 36A and AB, and the pineapple and coconut are grasped while opening and closing the bucket 34c, The vehicle is stored in a transport vehicle (not shown) or the like that is pulled to the rear side of the tractor 1.

  The external hydraulic pressure take-out device of the tractor 1 configured as described above has an external hydraulic pressure take-out connector 33A, 33B for communicating hydraulic pressure to the grabber work machine G at the rear of the cockpit 13 and in the vicinity of the rear end of the fender 12. Therefore, even when the hydraulic hose on the working machine G side is connected, the attaching / detaching operation can be performed with an easy posture. The plurality of connectors 33A and 33B can also be attached and detached together by removing the bracket 32 from the horizontal frame 16c, so that the handleability is good.

  Further, since the connectors 33A and 33B communicating with the first and second hydraulic cylinders 36A and 36B included in the grabber working machine G are held by the single bracket 32, maintenance is performed for each of the hydraulic cylinders 36A and 36B. When the specifications of the working machine G are changed, the hydraulic cylinder, the connectors 33A and 33B, and the pipes connected to the hydraulic cylinder can be attached and detached as a unit from the vehicle body.

  As another form of the above configuration, an electric actuator such as an electric cylinder 38 that opens and closes the worm gear 35 and the grab bucket 34g may be replaced with a hydraulic actuator. Further, as shown in FIG. 6, the base pillar 34a may be configured to stand on the horizontal frame 16c of the lops 16, and the plate member 16d for holding the brackets 32A and 32B is also bolt nuts or the like with respect to the horizontal frame. It may be configured to be detachable.

  Next, the cover structure of the PTO shaft 21 will be described with reference to FIGS.

  In the tractor 1, the upper cover 42 extends around the PTO shaft 21 from the rear side of the mission case 8. The upper cover 42 has a substantially inverted U shape when viewed from the rear, and has a rear end extending behind the PTO shaft 21 and slightly forward of the left and right lift rods 20 and 20. In addition, left and right covers 43 and 43 covering the left and right sides of the upper cover 42 are attached to the left and right lower links 19l and 19l, and the left and right covers 43 and 43 are configured to move up and down together with the lower links 19 and 19.

  If the cover that covers the PTO shaft 21 is covered only by the fixed cover attached to the transmission case 7 as in the prior art, it is necessary to cut out the portions of the fixed cover where the lower links 19 and 19 rotate vertically. The PTO shaft 21 was liable to adhere to mud and had a safety problem. However, such a problem can be solved by configuring as described above.

  Next, a protective configuration of the steering cylinder 44 that steers the left and right front wheels 5 and 5 will be described with reference to FIGS.

  A front axle case 4 is attached to the front lower portion of the body frame 2 so as to be swingable up and down around a center pivot 4a, and left and right front wheel cases 46 and 46 are attached to both ends of the front axle case 4 so as to be rotatable around a king pin. The left and right front wheels 5 and 5 are pivoted on the front wheel cases 46 and 46, the front wheel power is taken out from the transmission case 8 to the front wheel transmission shaft 47, and the left and right front wheels 5 are passed through the transmission in the front axle case 4 and the front wheel cases 46 and 46. , 5.

  A steering cylinder 44 for steering the front wheels is attached to the front side of the front axle case 4 along the left-right direction, and a cylinder cover 48 is provided in front of the steering cylinder 44.

  As shown in FIG. 11, the cylinder cover 48 has a plate-like cover portion 48 a that covers the front side of the cylinder 44, and the cover portion 48 a is bridged between one side portion of the body frame 2 and the left and right sides of the frame 2. It has the structure which has the two attachment pieces 48b and 48b attached with respect to the connection plate 2a. Each of the mounting pieces 48b, 48b is composed of a plate member in the vertical direction, and each of the mounting pieces 48b, 48b is configured to support the plate upright at a right angle with respect to the front surface of the cover.

  Since it is configured as described above, the strength of the cylinder cover 48 can be increased, and the mud or vegetation that pushes toward the front side of the steering cylinder 44 is released to the left and right along the front and side surfaces of the cover portion 48a. The cylinder 44 can be reliably protected.

  Next, the auxiliary hydraulic tank 52 will be described with reference to FIG.

  The auxiliary hydraulic tank 52 for the tractor is provided inside the bonnet 11 and between the front end portions of the body frame 2.

  The tank 52 joins the upper case half 52a having a concave shape and the lower case half 52b having a concave shape, and the outer peripheral plates 52c and 52d of the upper and lower case half pieces 52a and 52b. Thus, it is fixed to the fuselage frame 2.

  A cover 53 fixed to the body frame 2 together with the outer peripheral plate is provided below the auxiliary hydraulic tank 52, and the cover 53 covers the front and rear and the bottom of the tank 52.

  Further, the upper and lower case halves 52a and 52b are formed in a concave shape with the same shape, and the upper and lower case halves 52a and 52b are joined to form a tank with both recesses, and the rear side is compared with the front part. It has a flat shape. When the tank 52 is attached to the body frame 2, the tie rod 54 is placed below the flat part 52e, and hydraulic hoses 55 and 55 are connected above the flat part 52e. 23.

A side view of a tractor. The rear view which shows the attachment state of a connector. The side view which shows the attaching part of a hydraulic control valve. The top view which shows the attaching part of a hydraulic control valve. (A) Side view showing attachment state of hydraulic control valve and connector (B) Front view showing attachment state of hydraulic control valve. The rear view of the grabber working machine which shows another form. The side view which shows the attachment state of a PTO cover. The rear view which shows the attachment state of a PTO cover. The rear view which shows the attachment state of a cylinder protective cover. The side view which shows the attachment state of a cylinder protective cover. (A) Side view of cylinder protective cover. (B) Rear view of cylinder protective cover. (C) Top view of a cylinder protective cover. (A) The top view which shows the attachment state of a hydraulic-oil tank. (B) The front view which shows the attachment state of a hydraulic-oil tank.

Explanation of symbols

G Grabber work machine 1 Tractor 2 Airframe frame 5 Front wheel 10 Rear wheel 13 Pilot seat 16a Prop 16b Prop 16c Horizontal frame
24A Hydraulic control valve for extracting external hydraulic pressure 24B Hydraulic control valve for extracting external hydraulic pressure 31A Hydraulic hose 31B Hydraulic hose 32A Connector support bracket 32B Connector support bracket 33A connector 33B connector

Claims (2)

Left and right struts (16a, 16b) are erected on the rear side of the cockpit (13) arranged at the rear of the vehicle body, and the upper end portions of the left and right struts (16a, 16b) are connected by a horizontal frame (16c). In addition, an external hydraulic pressure takeout device for agricultural tractors, characterized in that the frame (16c) is provided with detachable brackets (32A, 32B) for holding a plurality of connectors (33A, 33B) for taking out external hydraulic pressure. A plurality of the detachable brackets (32A, 32B) are provided for each pair of connectors (33A, 33B) for supplying and discharging hydraulic pressure to a hydraulic actuator of a work machine (G) mounted on a tractor. Item 2. An external hydraulic pressure takeout device for an agricultural tractor according to Item 1.

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