JPS6218103Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a front PTO for agricultural tractors.
The purpose of the pulley belt cover attachment device is to allow the belt cover to be easily attached to the correct position, and to allow the belt cover to be easily attached to the front PTO.
To provide a belt cover mounting device that can effectively utilize space within a unit.

To clarify the present invention based on the drawings, Fig. 1 is a partially sectional front view of the front end of an agricultural tractor, and in Fig. 1, 1 indicates the body frame on the left side when viewed from the front of the tractor; 2 is the body frame on the right side when viewed from the front of the tractor. Generally speaking, "left side" and "right side" are referred to when the tractor is viewed from the rear, but in the explanation of this invention, for convenience, "left side" and "right side" are referred to when the tractor is viewed from the front. ”. Reference numeral 3 denotes a front frame fixed to the front edges of the left and right fuselage frames 1 and 2.

Gearbox support walls 6 and 7 extending vertically downward are formed on the left and right pair of brackets 4 and 5, respectively, at the center of the tractor's left and right width. They are facing across from each other. Between both supporting walls 6 and 7 is the front
A PTO gearbox 8 (imaginary line) is sandwiched in between, and the gearbox 8 is connected to a long bolt 9 and nut 1.
0 to the supporting walls 6 and 7. A vertical flange 11 is formed at the outer end (left end) of the left bracket 4, and this flange 1
1 is fixed to the inside of the left fuselage frame 1 by bolts 12, and a flange 13 is formed at the outer end of the right bracket 5, and this flange 13 is fixed to the inside of the right fuselage frame 2 by bolts. 12'. 4a and 5a are vertical reinforcing plates integrally fixed to the upper surfaces of the brackets 4 and 5.

The gearbox 8 is equipped with a horizontal input shaft 14 that protrudes toward the rear of the gearbox 8, and a vertical output shaft (PTO shaft) 15 that protrudes downward from the bottom surface of the gearbox 8. Both shafts 14 and 15 are interlocked and connected via the shaft. An input pulley 16 is fixed to the input shaft 14, and is interlocked and connected to a pulley 17 on the engine side via an input power transmission belt 18. An output pulley 19 is fixed to the output shaft 15, and is connected to the engine side pulley 17 via an input power transmission belt 18. It is interlocked and connected to the pulley on the working machine side via 20. Examples of working machines to which power is transmitted from such a front PTO include working machines that are mounted below the front-rear width center of a tractor, such as center-mounted disk drives and reciprocating mowers.

A horizontal support plate 21 extending outward (to the left) is integrally formed on the lower edge of the left support wall 6.
A first fulcrum shaft 22 that extends vertically downward is fixed to the outer end portion of the support plate 21 . A first tension arm 2 extending rearward is attached to the first fulcrum shaft 22.
3 is rotatably fitted into the support tube 24, and a first tension pulley 26 is rotatably supported at the rear end of the first tension arm 23 via a pin 25. . An L-shaped (Fig. 2) vertical plate 27 is integrally formed at the lower end of the right support wall 7 and extends outward (to the right) by a certain width and is bent so that its outer end extends rearward. A pin 28 that protrudes inward (to the left) is fixed to the rear end of the plate 27.
A first tension spring 29 is stretched between the first tension arm 23 and the first tension arm 23 . That is, the first tension pulley 26 is pressed against the output power transmission belt 20 by the elastic force of the first tension spring 29,
Tension is applied to the output power transmission belt 20. Further, a guide plate 30 extending vertically downward is fixed to the intermediate portion of the width of the plate 27 in the front-rear direction, and the output power transmission belt 20 is fixed to this guide plate 30.
A pair of inward facing (left facing) placed on the top and bottom of the
A guide pin 31 is fixed thereto, and the guide pin 31 prevents the output power transmission belt 20 from falling off the output pulley 19.

A support plate 33 is integrally formed on the rear edge of the upper wall of the right bracket 5, and extends rearward for a certain length, and the rear end thereof stands vertically. The fulcrum shaft 34 is fixed, and a support cylinder 36 equipped with a second tension arm 35 is rotatably fitted to the second fulcrum shaft 34.
A second tension pulley 37 is rotatably supported at the lower end portion of the tension pulley 5 via a pin 36'. A plate 38 extending rearward is integrally formed on the rear end edge of the left support wall 6, and a pin 39 protruding inward (to the right) is fixed to the rear end of the plate 38. A second tension spring 40 is stretched between the lower edges of the second tension arm 35 . That is, the second tension pulley 37 is pressed against the input power transmission belt 18 by the elastic force of the second tension spring 40, and tension is applied to the input power transmission belt 18.

FIG. 2 is a plan view (arrow F points forward), and the outsides of the left and right support walls 6 and 7, that is, the left side of the left support wall 6 and the right side of the right support wall 7, have circular cross-sectional front openings. U-shaped hooks 41 are each fixed, and a box-shaped belt cover 42 whose top and rear surfaces are open is attached to the hooks 41. That is, mounting tubes 43 are fixed to the inner sides of the left and right side walls of the belt cover 42, respectively, and the mounting tubes 43 are fitted into the outer portions 41a of the U-shaped hooks. The rear portion 41b of the hook 41 (the portion extending left and right) serves as a stopper that prevents the belt cover 42 from moving too far backward. When installing the belt cover 42, push the belt cover 42 backward until the mounting tube 43 is regulated by the rear portion 41b, and then tighten the mounting tube 43 with the chiseling screw 44.
to the U-shaped hook 41. The length of the U-shaped hook 41 in the front-rear direction and the position of the rear portion 41b are determined when the mounting tube 43 is restricted by the rear portion 41b.
are the outer part 41a and the rear part 41b of the hook 41.
The front wall 42a of the belt cover 42 is set to be spaced a certain distance from the front edge of the output pulley 19 when backward movement is restricted by the curved portion between the belt cover 42 and the front edge of the output pulley 19.

Front-back length of left and right brackets 4 and 5 D ₁
is the distance in the left-right direction between the inner edges of the inwardly directed pieces 1a and 2a formed at the lower ends of the left and right fuselage frames 1 and 2.
It is significantly shorter than D ₂ . In addition, the length in the front-rear direction of each component constituting the upper half of the PTO unit, such as the support plate 33 and the second fulcrum shaft 34 formed on the rear edge of the upper wall of the right bracket 5, is calculated from the bracket 4. ,5 longitudinal length
The length in addition to D ₁ , that is, the length in the longitudinal direction of the upper half as a PTO unit, is also
The interval D is configured to be shorter than ₂ .

When installing the brackets 4, 5, etc., first install the gearbox 8, the first tension pulley 26, and the second tension pulley 26.
Tension pulley 37 etc. are assembled into brackets 4 and 5 to form one PTO unit.
The unit is turned 90 degrees in the horizontal plane from the position shown in Fig. 2, and inserted from below between the fuselage frames 1 and 2, so that the upper walls of the brackets 4 and 5 touch the inwardly facing pieces 1a and 2a of the fuselage frames. After passing upward, put the brackets 4, 5, etc. in the position shown in Figure 2,
Attach flanges 11 and 13 at both ends to bolts 12 and 1.
2' to the fuselage frames 1 and 2.
In other words, the brackets 4, 5, etc. can be attached to the aircraft frames 1, 2 as one PTO unit, so the installation work is extremely simple.
Moreover, during the installation work, the engine side pulley 1 with the electromagnetic clutch located on the side of the fuselage frames 1 and 2.
There is no need to worry about damaging the pulley 17 by hitting it.

FIG. 3 is a schematic plan view of another embodiment of the present invention (arrow F points forward), and a hook 50 as a mounting member has a portion 50c on the side of the center of the left-right width of the machine extending rearward to form a step-like shape. It is formed. 50a is a portion extending forward into which the mounting tube 43 of the belt cover 42 can be inserted from the front, and 50b is a regulating portion.

As explained above, according to the present invention: (1) The work of attaching the belt cover 42 does not require much effort. That is, the belt cover 42 is provided with an attachment tube 43, and the brackets 4 and 5 have forwardly extending portions 41a and 50 into which the attachment tube 43 can be inserted from the front.
Since the hooks 41 and 50 having the shape a are provided, the belt cover 42 can be easily attached from the front of the tractor while the operator is located in front of the tractor.

(2) There is no hassle in aligning the belt cover 42 to the correct mounting position. That is, hook 41,5
Since the regulating portions 41b and 50b are provided at 0,
By simply pushing the belt cover 42 backward until it is regulated by the regulating portions 41b and 50b, the belt cover 42 can be aligned to the mounting position, which prevents the belt cover 42 from coming into contact with the output power transmission belt 20 and the output pulley 19. It can be easily installed without any hassle. In addition, there is no fear that it will shift rearward due to vibrations of the tractor and come into contact with the pulley 19 etc. after installation.

(3) The gearbox 8 is clamped between the left and right brackets 4 and 5, and is attached to a pair of left and right hooks 41 and 5.
0 is placed on the left and right sides of the gearbox 8, so that the space on the brackets 4 and 5 can be used in a well-balanced and effective manner.

Note that the cross-sectional shape of the attachment members, that is, the hooks 41 and 50 is not limited to a circular shape, and various shapes such as a rectangular shape and an elliptical shape are possible. Of course, if the hooks 41, 50 have a rectangular or oval cross-sectional shape, the mounting tube 4
The cross-sectional shape of the hole No. 3 is made the same as the cross-sectional shape of the hooks 41 and 50.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of the front end of a tractor equipped with a PTO device according to the present invention, Fig. 2 is a plan view of the same part as Fig. 1, and Fig. 3 shows another embodiment. FIG. 1, 2... Airframe frame, 4, 5... Bracket, 8... Gearbox, 19... Output pulley (PTO pulley), 20
... Output power transmission belt, 41, 50... Hook (mounting member), 41b, 50b... Regulation part, 42...
...Transmission belt cover, 43...Mounting tube.

Claims (1)

[Scope of utility model registration request] The front PTO gearbox is fixed between a pair of left and right brackets that are fixed to the left and right fuselage frames respectively, and a pair of left and right mounting tubes are provided on the transmission belt cover for the PTO pulley, and these mounting tubes can be inserted from the front. A front of an agricultural tractor, characterized in that a mounting member having a portion extending forward and a regulating portion for locking the belt cover in the mounting position is fixed to each of the left and right brackets.
PTO pulley belt cover mounting device.