JPH0629084Y2 - Chain tension device for self-propelled vehicles - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a chain tensioning device for a self-propelled vehicle such as an agricultural chemical spraying vehicle, more specifically, a tension of a chain for transmitting a driving force of an engine to a drive shaft. The present invention relates to a chain tensioning device for a self-propelled vehicle that is easy to adjust, maintain and replace the tensioner.

[Conventional technology]

In Japanese Utility Model Publication No. 61-12723, in a rotary tiller, a curved tensioner rotatably supports one end of the chain case inside the chain case so that the tension of the chain can be adjusted from the outside of the chain case. The adjusting bolt allows the operation portion to be placed outside the chain case and allows the tip end portion to be pressed toward the chain from the concave surface side of the curved tensioner to adjust the rotational position of the curved tensioner. .

In addition, Japanese Utility Model Application No. 57-145949 (Japanese Utility Model Application No. 59-49)
534), the specification and drawings refer to
An opening is formed in the chain case, a tensioner is attached to the inner surface of the lid, and the lid is detachably attached to the opening of the chain case.

[Problems to be solved by the device]

In the chain tensioning device of Japanese Utility Model Publication No. 61-12723, the tension of the chain can be adjusted from the outside of the chain case, but it is necessary to disassemble the chain case when replacing and maintaining the tensioner, and the work is not complicated. It's getting harder.

Further, in Japanese Patent Application No. 57-145949, it is difficult to adjust the tension of the chain from the outside of the chain case.

An object of the present invention is to provide a chain tensioning device for a self-propelled vehicle, which enables easy tension adjustment of the chain from the outside of the chain case and facilitates replacement and maintenance of the tensioner.

[Means for Solving the Problems]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

In the self-propelled vehicle (10), the chains (52, 54) are mounted between the axle-side sprockets (48, 50) and the drive-shaft side sprockets (44, 46), and are placed in the chain case (38). It is set up. The chain tensioning device should be fitted with an opening (6
A stay (62) including a base portion (64) inserted into the chain case (38) from 5) and a side wall portion (66) closing the opening (65),
An elastically deformable curved tensioner (86) that is fixed to the base portion (64) at one end and presses the chains (52, 54), and the operation portion (74) and the base portion that are exposed to the outside of the side wall portion (66). A rod portion (72) that extends along (64) and is screwed to the other end of the curved tensioner (86) at the tip is rotatably supported with respect to the stay (62) and is prevented from axial displacement. And an adjusting rod (70) which is installed.

[Action]

For the stay (62), connect the base (64) to the opening (6) of the chain case (38).
It is inserted into the chain case (38) from 5) and is detachably attached to the chain case (38) at the side wall portion (66).
In this mounting position, the curved tensioner (86) faces the chain (52, 54) in the chain case (38). The adjustment rod (70) is rotated while maintaining its axial position constant by rotating the operation portion (74) of the adjustment rod (70) from the outside of the chain case (38). As a result, the other end of the curved tensioner (86) is displaced in the axial direction of the adjusting rod (70). The curved tensioner (86) is elastically deformable and has a base (64) for the stay (62) at one end.
Since the adjustment rod (70) is rotated, the bending degree is displaced, and the displacement amount of the chain (52, 54) at the contact portion with the curved tensioner (86) is changed. The tension of (52, 54) changes. Curved tensioner
During maintenance and replacement of the (86), the stay (62) is removed from the chain case (38), and the curved tensioner (86) is exposed to the outside of the chain case (38).

〔Example〕

 The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 4 is a schematic diagram of a power transmission system of a speed sprayer 10 as a self-propelled vehicle. Speed sprayer 10 has front wheels
A frame 18 is provided, which can be driven by 12 and the front rear wheel 14 and the rear rear wheel 16. The power of the engine 20 is transmitted to the sub transmission 24 via the main transmission 22, and the main transmission 22
And the sub-transmission 24 controls the reduction ratio. The propeller shaft 26 extends from the sub transmission 24 to the front side and transmits power from the sub transmission 24 to the differential device 28. The front drive shaft 30,30 is
Horizontally extending from the differential device 28, the power of the engine 20 from the differential device 28 to the front wheels 12
Communicate to. The propeller shaft 32 extends rearward from the sub transmission 24, and transmits power from the sub transmission 24 to the differential device 34. The rear drive shafts 36, 36 extend horizontally from the differential device 34 in the left-right direction. The chain case 38 is attached to the side surface of the rear end portion of the frame 18, and rotatably supports the rear drive shaft 36 and the axles 40, 42. The front axle 14 and the rear axle 16 are attached to the axles 40, 42 integrally and rotatably in the portions projecting laterally from the chain case 38. Within the chain case 38, the sprockets 44, 46 are rearward. Drive shaft 36, sprockets 48, 50 on axles 40, 42,
Each is mounted so as to rotate integrally. The chains 52 and 54 are mounted between the sprockets 44 and 48 and between the sprockets 46 and 50, respectively, and transmit engine power from the rear drive shaft 36 to the axles 40 and 42.

FIG. 2 is a plan view of the inside of the chain case 38 with the upper wall portion of the chain case 38 removed. The rear drive shaft 36 and the axles 40, 42 are rotatably supported on the inner wall of the axle housing 60 or the side wall of the chain case 38 by a ball bearing 58 on the side of the wall opposite the chain case 38. There is. The stay 62 is disposed below the chains 52 and 54 and extends along the lower side wall of the chain case 38. The stay 62 stands vertically upward from the rear edge of the base 64 and is attached to and detached from the rear wall of the chain case 38. And a side wall portion 66 that is freely fixed and that closes an opening 65 in the rear wall of the chain case 38. 68
Is a contour line of the base portion 64, and the base portion 64 has a contour line 68 that covers a range from below the chains 52 and 54 to the rear end of the chain case 38.

FIG. 1 is a side view of the chain tensioning device for the chain 52. The base 64 is placed on the upper surface of the lower side wall of the chain case 38, and can be pulled out of the chain case 38 when the stay 62 is pulled out from the chain case 38. The adjusting rod 70 includes a rod portion 72 that extends parallel to the base portion 64 on the same vertical surface as the moving surface of the chain 52 and penetrates the side wall portion 66, and a rod portion 72 on the outer surface side of the side wall portion 66. It has a flange-shaped operation portion 74 integrally formed with the base end portion. The screw groove 76 is formed at the tip of the rod portion 72, and the two plate-shaped receiving portions 78 are arranged upright at positions axially separated from the rod portion 72, and the lower end is fixed to the base portion 64. ing. The bulging receiving portion 80 is fixed to the inner surface side of the side wall portion 66 by a bolt 82, and protrudes inward of the chain case 38 from the inner surface side of the side wall portion 66. The rod portion 72 includes a plate-shaped receiving portion 78 and a bulging receiving portion.
The plate-shaped receiving portion 78 and the bulging receiving portion while penetrating 80
It is rotatably supported by 80. The O-ring 84 is arranged in the penetrating portion of the rod portion 72 in the bulging receiving portion 80. The snap ring 85 is an inner plate-shaped receiving portion in the axial direction of the rod portion 72.
The plate-shaped receiving portion is fitted inside the 78 and outside the plate-shaped receiving portion 78 at the positions adjacent to each other.
The contact with 78 blocks the relative movement of the adjusting rod 70 with respect to the stay 62 in the axial direction. The curved tensioner 86 is composed of an elastically deformable leaf spring, is fixed to the base portion 64 by a bolt 88 at an end portion far from the adjusting rod 70, and pushes up the chain 52 at the central curved portion to tension the chain 52. Is given. The curved tensioner 86 also has a screw hole 90 at the end closer to the adjusting rod 70, and the rod portion 72
The thread groove 76 at the tip of the is screwed into the screw hole 90.

The chain tensioning device of the chain 54 has the same structure as the chain tensioning device of the chain 52 except for a part. The difference is that in the chain tensioning device for the chain 54, the distance from the side wall portion 66 of the stay 62 to the curved tensioner 86 is the chain.
Since it is shorter than in the case of the chain tensioning device of 52, only one plate-like receiving portion 78 is provided, and one pair of retaining rings 85 has one plate-like receiving ring as seen from the plan view of FIG. When the receiving portion 78 is sandwiched from both sides and abutted, it is fitted into the rod portion 72,
This is to prevent relative movement of 72 in the axial direction.

The operation of the chain tensioning device shown in FIG. 1 will be described. In the stay 62, the base 64 has an opening 65 in the rear end wall of the chain case 38.
It is inserted into the chain case 38 from the
Slides on the lower side wall surface of the chain case 38 and moves toward the inside in the chain case 38,
It is placed on the lower side wall surface. In addition, the side wall of the stay 62
66 closes the opening 65, and the chain case at the periphery
It is detachably attached to 38. In this mounting position, the curved tensioner 86 is in a position facing the chain 52 in the chain case 38. The adjusting rod 70 is rotated by the rotation operation of the operating portion 74 of the adjusting rod 70 from the outside of the chain case 38, and the retaining ring 85 on the rod portion 72 is provided with the plate-like receiving portion 78.
The abutment with and prevents axial displacement of the rod portion 72. As a result, the curved tensioner in the thread groove 76 of the rod portion 72 is
The screwing position of the screw hole 90 of 86 is displaced in the axial direction of the rod portion 72. Since the curved tensioner 86 is elastically deformable and is fixed to the base portion 64 of the stay 62 at one end, the degree of bending is changed by the rotation of the adjusting rod 70, and the amount of pushing up the chain 52 is changed. And this allows the chain
The tension of 52 changes. When performing maintenance or replacement of the curved tensioner 86, the stay 62 is removed from the chain case 38, and the curved tensioner 86 is exposed to the outside of the chain case 38.

FIG. 3 is a modification of the chain tensioning device of FIG.
Remove the upper wall of the chain case 38 to remove the chain case 38.
It is the top view which looked inside. In FIG. 2, the chain 52,
The chain tensioning device of 54 has a common stay 62, but in the chain tensioning device of FIG. 3, the chain tensioning devices of the chain 52 and the chain 54 have separate stays 62 and the base of each stay 62. The portion 64 has a rectangular outline 92. The chain tensioning device for the chain 52 and the chain 54 has openings 65 in the end wall, that is, the front wall and the rear wall of the chain case 38 near the chains 52 and 54, respectively.
Is inserted into the chain case 38 from. Other configurations are second
It is the same as the chain tensioning device in the figure.

In the illustrated embodiment, in order to prevent the axial displacement of the adjusting rod 70, the contact between the retaining ring 85 and the plate-like receiving portion 78 is used. An annular protrusion and an annular groove are respectively provided on one side and the other side of the plate-shaped receiving portion 78, the bulging receiving portion 80, etc. that rotatably support the rod portion 72, and the adjusting rod is slid in the circumferential direction. It is also possible to prevent the axial displacement of 70 and omit the retaining ring 85.

[Effect of device]

As described above, according to the present invention, the stay is attached to the chain case so that its base can be inserted into the chain case, and the elastically deformable curved tensioner is attached to the base of the stay. The operating portion is disposed outside the chain case and is screwed to the other end of the curved tensioner at the tip of the rod portion. With this, by rotating the operating portion of the adjusting rod from the outside of the chain case, the screwing position between the rod portion and the curved tensioner in the axial direction of the rod portion of the adjusting rod is changed, and the bending degree of the bending tensioner is changed. Therefore, the pushing amount of the chain by the curved tensioner changes, and the tension of the chain can be adjusted.

In addition, by pulling out the base of the stay from the chain case, the curved tensioner assembled to the base can be easily pulled out to the outside of the chain case, making maintenance and replacement of the curved tensioner easy. Becomes

[Brief description of drawings]

1 is a side view of a chain tensioning device for a chain, and FIG. 2 is a plan view of the inside of the chain case with the upper wall portion of the chain case removed. Fig. 3 is a modification of the chain tensioning device of Fig. 2 and is a plan view of the inside of the chain case with the upper wall portion of the chain case removed, and Fig. 4 is the power transmission of a speed sprayer as a self-propelled vehicle. 1 is a schematic diagram of the system. 10 ... Speed sprayer (self-propelled vehicle), 38 ... Chain case, 44, 46 ... Sprocket (drive shaft side sprocket), 48, 50 ... Sprocket (axle side sprocket), 52, 54 ... Chain, 62 ... Stay, 64 ...
Base, 65 ... Opening, 66 ... Side wall, 70 ... Adjusting rod, 72
... rod portion, 74 ... operating portion, 86 ... curved tensioner.

Claims (1)

[Scope of utility model registration request] 1. The chain (52, 54) is a sprocket on the axle side.
(48, 50) and a drive shaft side sprocket (44, 46) mounted between the chain case (38) of the self-propelled vehicle mounted in the chain case (38), the chain case (38) Stay (62) having a base portion (64) inserted into the chain case (38) through the opening (65) and a side wall portion (66) closing the opening (65), and the base at one end An elastically deformable curved tensioner (86) fixed to the portion (64) and pressing the chain (52, 54), an operation portion (74) exposed to the outside of the side wall portion (66), and the base portion ( 64) and a rod portion (72) screwed to the other end portion of the curved tensioner (86) at the tip end portion thereof, and is rotatably and axially displaced with respect to the stay (62). A chain tensioning device for a self-propelled vehicle, comprising: an adjusting rod (70) which is blocked.