JPS633780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a forward/reverse switching type power take-off device for a vehicle such as a tractor, and particularly relates to a forward-rotation driven gear and a reverse-rotation driven gear disposed in a power take-off case for forward/reverse switching. In order to effectively utilize the inter-gear space inevitably formed due to the presence of a shifter, etc., a shaft support wall of an inner space protruding type and an idler are arranged correspondingly in a recessed manner to support an idle shaft between the gears. It is an object of the present invention to provide an inexpensive forward/reverse switching type power extraction device that is lightweight, compact, and has sufficient strength.

First, before explaining an example of the power take-off device of the present invention, the front-loading work equipment mounting mechanism shown in FIGS. 1 to 4 will be roughly explained. 2. The structure consists of an engine 3, a clutch housing 4, a transmission case, etc., and the engine 3 and the like at the front thereof are covered by a bonnet 5. The front wheel bearing stand 2 is located at the front end of the tractor body 1 and is rigidly connected to the crankcase of the engine 3. Reference numeral 6 denotes a front axle case, which is supported on the front axle bearing stand 2 so as to be able to swing freely around the center axis.The front axle case 6 can be steered around the king pin 8 via a final reduction gear 7, etc. at both left and right ends of the front axle case 6. A front wheel 9 is provided. Naomi wheel 9
is considered to be the driving wheel. 10 is the tractor body 1
The mounting frame is L-shaped when viewed from the side and is arranged on both sides of the front of the vehicle. The rear end portions are removably attached to the clutch housing 4 by mounting bolts 13, respectively. The upper ends of the upright portions 11 of each mounting frame 10 are integrally connected on the left and right by a cylindrical connecting member 14 at the front position of the bonnet 5.
A top link mounting base 15 is provided in the central portion of 4. The top link mounting base 15 has a plurality of mounting holes 16 in the vertical direction, and a top link 18 is removably pivoted by a pivot pin 17. Note that the top link 18 is extendable and retractable by a turnbuckle. Reference numeral 19 denotes a mounting base that is attached to the inside of the lower front corner of the mounting frame 10 via reinforcing plates 20 and 21. A lower link 24 and a lift cylinder 25 are detachably pivotally connected. In other words, the lower link 24 and the lift cylinder 25 are pivotally mounted inside the mounting frame 10, that is, within the width of the front axle bearing pedestal 2, and the protrusion outward in the lateral direction near the front axle bearing pedestal 2 is minimized. I'm trying to reduce it. There are a pair of lower links 24 on the left and right sides, and the lower links 24 protrude forward from the tractor body 1 and are supported by pivot pins 22 so as to be vertically movable. The lift cylinders 25 are for lifting and lowering the lower links 24, and there are a pair of left and right lift cylinders corresponding to each lower link 24.
One end of this lift cylinder 25 is connected to a lift arm 27 via a pivot pin 26. The lift arm 27 is pivotally supported by the connecting member 14 so as to be vertically movable about its axis, and a lift rod 28 connected to each lower link 24 is pivotally attached to the front end of the lift arm 27. Note that the lower link 24 has ball joints at both ends. 29 is lower link 2
The check chain is a check chain that restricts the left and right swinging of the frame 4, and is extendable and retractable with a turnbuckle 30, and is mounted on the same axis as the pivot pin 22 on the check chain fixture 31 attached to the inside of each mounting frame 10. They are removably connected by pins. 3
3 is a muzzleloading work machine. Reference numeral 34 denotes a front power take-off device, which is removably attached to the front surface of the front vehicle bearing stand 2 between the left and right mounting frames 10 via a spacer 35 with a plurality of mounting bolts 36. 34 has a rear part inserted under the light grille of the bonnet 5, and the lower link 24 and the pivot pin 22 of the lift cylinder 25 are attached to the side portions of the front power take-off device 34. , 23 are arranged. The front power take-off device 34 has an input shaft 37 and an output shaft (front PTO shaft) 3.
8, whose input shaft 37 is removably connected to a crankshaft 41 of the engine 3 via a clutch 39 and a transmission shaft 40. Reference numeral 42 denotes an abutment member installed between the pair of left and right mounting frames 10, which abuts against the front surface 2a of the front vehicle bearing stand 2, and which acts on the pivot pin 23 via the lift cylinder 25 when the work equipment is raised; This is for transmitting the force acting on the pivot pin 22 via the lower link 24 to the front surface 2a side of the front vehicle bearing stand 2 when the work machine is backed up. In this case,
The axes of the lift cylinder 25 and the lower link 24 are configured to pass within the height range of the front surface 2a of the front vehicle bearing stand 2. The top link 18 and the pair of left and right lower links 24 constitute a three-point link mechanism.

In this way, the installation and drive system for front-mounted work equipment is constructed, but depending on the model of work equipment, there are limits to the conventional power take-off device that only drives forward rotation, so instead There is a demand for a switchable device, and the applicant has created and proposed a specific device.

That is, what is shown in FIGS. 5 to 7 is one embodiment.

To explain the overall appearance, 43 connects the rear case 44 and the front case 45 with bolts 46...
The upper and lower parts of the case 43 are mounted with an input shaft 37 and an output shaft 38 facing in the front-rear direction, respectively, and these are connected by a bearing body 47. It is rotatably supported.
A forward rotation drive gear 49 is fixed to the front end of the input shaft 37 via a collar 48, and a reverse rotation drive gear 51 is fixed to the rear thereof via a distance collar 50.

Each of these gears 49, 51 has oil passages 52, 52, while the lower output shaft 38 is equipped with a normal rotation driven gear 53 at the front, which rotates freely to the upper normal rotation driving gear 49. A reverse driven gear 54 is provided at the rear for free rotation. Each of these gears 53, 54 has oil passages 52, 52.
is formed, and a shifter 55 is disposed therebetween, and can be selectively engaged with the occlusal teeth 58, 58 at the ends of each driven gear 53, 54 by externally acting on a lever 56 and a shift fork 57. Transmission is possible to the output shaft 38.

In this way, the input system and output system are configured, and the idle shaft 5 configured for the reverse transmission system.
9, input side idler 60 and output side idler 61
In addition, the relationship between the bearing means and the like in terms of position and support strength has become a problem here.

In this invention, consideration has been given to the forward/reverse type power take-off device in view of these points, and the feature here is that the input shaft 37 and the output shaft are attached to the power take-off case 43 provided in the vehicle. 38 and an idle shaft 59 are provided, and a forward rotation drive gear 49 is provided on the input shaft 37.
and a reverse rotation drive gear 51, and a forward rotation driven gear 53 that meshes with the forward rotation drive gear 49 on the output shaft 38;
A reverse driven gear 54 is provided to freely rotate, and a shifter 55 is provided to selectively couple these driven gears 53, 54 to the output shaft 38, and an idle shaft 59 is provided.
It is equipped with an input side idler 60 and an output side idler 61 that mesh with the reverse rotation drive gear 51 and the reverse rotation driven gear 54 separately, one end of the idle shaft 59 is connected to the power extraction case 43, and the other end is connected to the power extraction case 43.
The shaft support wall 63 and the input side idler 60 are provided so as to fit into the space between the driven gears 53 and 54.

Hereinafter, the main parts will be explained based on the above-mentioned embodiment.

That is, inside the front case 45, as shown in FIG. 6, an integral shaft support wall 63 is provided to protrude into the inner space, and a ball-shaped bearing body 47 is fitted in the center thereof. The front end of the idle shaft 59 is supported on this bearing body 47, while the needle-type bearing body 4 is installed in a bearing hole 62 recessed in the rear case 44 so as to protrude rearward.
7'.

At the front of this idle shaft 59, there is a large-diameter input side idler 60 that meshes with the reverse drive gear 51.
In addition, an output side idler 61 on the small diameter side is attached to the rear part, and special consideration was given here to the presence of a shifter 55 etc. for forward/reverse switching between the front and rear driven gears 53 and 54 of the output system. Taking advantage of the fact that the space is inevitably placed in the front and back,
In between, there is a shaft support wall 63 and a front input side idler 60.
and are arranged in a corresponding manner. This eliminates the need for arranging the idle system far above the output system, making the case 43 more compact. Furthermore, making it more compact means that it is lighter and cheaper, and has increased rigidity, and since it is located low compared to the output system, oil lubrication performance is also improved.

Other features include the output side idler 61 as described above.
Since it is on the small diameter side, the transmission torque is larger than that of the input side idler 60 on the large diameter side.If both sides were supported by one ball bearing, of course, the shaft end of the output side idler 61, which has a small diameter, would be Since a large load is applied, one more consideration was taken here, and a needle-type bearing body 47' having a long bearing length was interposed at the rear end of the idle shaft 59 to cope with the problem. Of course, in this case, since the actual bearing capacity is the issue, two or more rows of ball bearings may be used instead of needles.

Incidentally, to supplementarily explain the constituent points of the above embodiment, FIG.
It is an L-shaped auxiliary bracket that is fixed and protrudes from the top.
A mounting boss 65 on the upper left side of the power extraction case 43 is fixedly attached through this. If this is the case 43 that rotates only in the normal direction as shown in the imaginary line A in Fig. 6, the mounting bolts 36 can be arranged at four points, but as shown in the solid line case in Fig. 6, the upper shoulder is bulged in the idle system. This is based on the fact that if the bolt 36 were to be placed in such a manner, it would be impossible or difficult to place the bolt 36 in the correct position due to positional restrictions with respect to external neighboring members. Also, 66 is case 4
3. It is a refueling part protruding from the front.

The present invention is as described above, and between the forward rotation driven gear 53 and the reverse rotation driven gear 54 on the output shaft 38,
There is a shifter 55 for selectively coupling these driven gears 53, 54 to the output shaft 38, and by utilizing the space inevitably formed by this, a shaft supporting wall 63 supporting the idle shaft 56 is provided. Input side idler 6
0 in the space, the entire device can be made smaller and lighter. Further, on the idle shaft 59, an input side idler 60 and an output side idler 6 are disposed, which mesh separately with the reverse rotation driving gear 51 of the input shaft 37 and the reverse rotation driven gear 54 of the output shaft 38.
1, and the input side idler 60 is inserted into the space between the driven gears 53 and 54 as described above, so that a large reduction ratio on the reverse side can be obtained. Therefore, according to the present invention, it is small and lightweight;
It has now become possible to provide a forward/reverse switching type power extraction device that has a large reduction ratio when reversing.

It is to be noted that this invention is also planned to be implemented as a rear power extraction device or other power extraction device.

[Brief explanation of the drawing]

Fig. 1 is a side view of a tractor showing an example of the present invention, Fig. 2 is a front side view thereof, Fig. 3 is a plan view thereof, Fig. 4 is a front view thereof, and Fig. 5 is an enlarged cross section of a power take-off device. Figure 6 is a sectional view taken along the line shown in Figure 5;
FIG. 7 is a sectional view of other parts. 34...Front power take-off device, 37...Input shaft,
38... Output shaft, 43... Power take-off case, 49
...Forward rotation drive gear, 51...Reverse rotation drive gear, 53
...Forward rotation driven gear, 54...Reverse rotation drive gear, 59
...Idle axis, 60 ...Input side idler, 61
...Output side idler, 63...Shaft support wall.

Claims (1)

[Claims] 1 The input shaft 3 is attached to the power extraction case 43 provided in the vehicle.
7, an output shaft 38 and an idle shaft 59, the input shaft 37 is provided with a forward rotation drive gear 49 and a reverse rotation drive gear 51, and the output shaft 38 is provided with a forward rotation driven gear 53 that meshes with the forward rotation drive gear 49. , a reversing driven gear 54 are provided to freely rotate, and these driven gears 53, 5
a shifter 55 selectively coupling 4 to the output shaft 38;
The idle shaft 59 is provided with an input side idler 60 and an output side idler 61 that mesh with the reverse rotation drive gear 51 and the reverse rotation driven gear 54 separately, one end of the idle shaft 59 is connected to the power extraction case 43, and the other end is connected to the power extraction case 43. is supported by a shaft support wall 63 protruding inward from the power extraction case 43, and this shaft support wall 63 and the input side idler 60 are provided so as to fit into the space between the driven gears 53 and 54. Forward/reverse switching type power take-off device for vehicles.