JPH0614093Y2 - Steering clutch operating shaft mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure for mounting an operation shaft of a steering clutch incorporated in a crawler traveling device, and more specifically, a split case of a transmission case that can be divided into two. The operation shafts that engage and disengage the left and right steering clutches by rotating around the respective shaft cores are supported on the respective parts in a state in which they are positioned in parallel to each other, and these two operation shafts are positioned in the axial direction. As described above, the one plate-shaped positioning member having the two notches is formed in a state where the peripheral edges of the notches engage with the circumferential grooves formed on the corresponding operation shafts. The present invention relates to an operating shaft mounting structure for a steering clutch, which is mounted to one of the divided case portions via a single bolt.

[Conventional technology]

In the conventional operating shaft mounting structure for such a steering clutch, as shown in FIG. 6, first and second cutouts (7A), (7A)
B), the positioning member (7) is attached to the mission case (4) with bolts (9), and the mission case (4)
It was formed in a state of being opened in a substantially L-shape extending in the direction of division and the direction orthogonal to the direction of division.

Alternatively, as shown in FIG. 7, the first and second notches (7A),
Both (7B) open in the direction orthogonal to the line segment connecting the axes of both operating shafts (6A) and (6B) when the positioning member (7) is attached to the mission case (4). It was formed in a U shape.

[Problems to be solved by the device]

However, the nut portion for mounting the positioning member and the second
Both the operating shaft and the operating shaft are provided in the second split case portion and are relatively easy to obtain dimensional accuracy between them, but the nut portion and the first operating shaft are in the first and second split case portions. It is provided so as to straddle the parts, and the dimensional accuracy between the two is relatively difficult to obtain. Further, variations in the inter-axis distance of the operating shaft also occur due to assembling errors of both split case portions, but most of this variation is due to the dimensional error on the first operating shaft side that is not bolted due to the above reason. However, the following inconveniences occurred.

That is, in the conventional structure shown in FIG. 6, in order to absorb the variation in the axial distance between both operating shafts, the direction in which both operating shafts are connected at the peripheral edge (8A) of the first cutout portion (7A) (in FIG. 6). There is no choice but to lengthen the part along the left and right direction of the
Engagement between the circumferential groove (6a) and the portion in the direction (the vertical direction in FIG. 6) orthogonal to the direction connecting both operation shafts in A) cannot be expected.

In addition, the rattling between the notch and the operating shaft due to a relatively small dimensional error between the bolt (9) and the second operating shaft (6B) causes the rattling of the first split case portion without the bolt (9). 1 operation axis (6A)
It will be exposed in the part, and the periphery of the first cutout part (7A)
It is possible that even the engagement between the peripheral groove (6a) and the portion along the direction connecting the two operation shafts in (8A) (left-right direction in FIG. 6) may be unfavorable, and as a result, the first split case portion (4A) There is a problem that the engagement between the operation shaft (6A) and the positioning member (7) tends to be uncertain, and in some cases, the engagement may become impossible.

Even in the conventional structure shown in FIG. 7, most of the variations due to the dimensional error are the same on the first split case portion (4A) side, and the cutout portions (7A), (7
Although the shape of (B) is U-shaped, in reality, the engaging portion between the first cutout portion (7A) and the first operating shaft (6A) is in a direction orthogonal to the line segment connecting both operating shafts ( Not only is it possible to engage in a one-sided engagement only at the location (vertical direction in FIG. 7), but as with the structure of FIG. That is, in any of the structures, the engagement margin of the entire peripheral edge with the circumferential groove is likely to be insufficient, and there is room for improvement.

The present invention has been made in view of such circumstances, and its purpose is to support the positioning member to the split case portion on the side where the positioning member cannot be attached, regardless of variations in the distance between the operating shafts. The point is that the operation shaft can be surely engaged.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a mission case by attaching a second divided case portion to a first divided case portion and rotating the first and second divided case portions around their axes. The first and second operation shafts that engage and disengage the left and right steering clutches are supported in a state where they are positioned in parallel with each other, and the first and second operation shafts are positioned so as to position them in the axial direction. One plate-shaped positioning member having a notch formed therein is provided with a single bolt in the second divided case portion in a state where the peripheral edges of the notches engage with the circumferential grooves formed on the corresponding operation shafts. In the operating shaft mounting structure for the steering clutch mounted via the first clutch case, the first notch portion corresponding to the first split case portion is attached to the second split case portion, and the first cutout portion corresponding to the first split case portion Along the line connecting the axes In the state, it is opened toward the side away from the bolt, and is formed in a U-shape that engages with the circumferential groove on both sides in the radial direction of the first operating shaft, and the second corresponding to the second split case portion. The notch is opened in a direction along an arc around the shaft center of the bolt in a state where the positioning member is attached to the second split case portion, and
The second operation shaft is formed in a U-shape that engages with the circumferential groove on both sides of the second operation shaft in the radial direction, and the action and effect thereof are as follows.

[Action]

To summarize what was described in "Problems to be solved by the invention", in the divided case portion on the side where the bolt is not mounted, the dimensional error between the operating shaft and the positioning member tends to occur in the direction of the line segment connecting both operating shafts. However, in the divided case portion on the bolt mounting side, the dimensional error in the direction of the line segment connecting the operation shafts of the operation shaft and the positioning member does not pose a problem.

Therefore, referring to FIG. 1, the first notch (7A), which is the non-bolt mounting side, is opened along the line segment connecting both operation shafts (6A) and (6B), and Since it is set in a U-shape that engages on both sides of the shaft, for example, there is a dimensional error in the direction of the line segment connecting the operation shafts (6A) and (6B) (left-right direction in Fig. 1). Also, on both sides in the direction orthogonal to the direction of the line segment connecting both operation shafts (6A) and (6B) [upper and lower in FIG. 1 (b)], the first operation shaft (6A) and the positioning member (7) Will always be able to join.

In addition, the bolt (9) and the first notch (7A) are attached to both operation shafts (6A),
If there is a dimensional error in the direction orthogonal to the line segment connecting (6B), the variation caused by it will be different from that of the second notch (7B) and second
Although it appears in the engagement portion with the operation shaft (6B), the second cutout portion (7B) is opened in the direction along the arc around the shaft center of the bolt (9), and the second operation shaft ( Circumferential grooves (6b) on both radial sides of (6B)
Since it is formed in a U-shape that engages with, the second operation shaft (6B) and the positioning member (7) must be engaged at least in the direction of the line segment connecting both operation shafts (6A) and (6B). Can be combined.

In other words, regardless of the presence of dimensional error, the radial direction of the shaft can be changed regardless of the presence of dimensional errors by devising the idea of making the notches in the split case part on the bolt mounting side and the split case part on the non-mounting side different. The engagement state with the positioning member can be surely brought out on both sides facing each other.

[Effect of device]

As a result, by devising the shape and direction of the notch,
It became possible to reliably position both operation shafts in their axial directions while making it a simple and cost-effective means of attaching one positioning member to the mission case with one bolt.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 3, a combine harvester (3), which is provided with left and right crawler traveling devices (1) and is equipped with a threshing device (2), is connected to the front part of a machine frame which can be raised and lowered. Constitute.

As shown in FIGS. 1 and 2, the mission case (4) for distributing power to the left and right crawler traveling devices (1) is
The mission case (4) is equipped with left and right steering clutches (5A), (5B) that can be individually engaged and disengaged from the power transmission to the crawler traveling device (1). ing.

As shown in FIGS. 1 and 2, each of the first and second split case portions (4A) and (4B) constituting the mission case (4) rotates about its axis. As a result, the first and second operation shafts (6A) and (6B) that engage and disengage the corresponding ones of the steering clutches (5A) and (5B) are supported in a state in which they are positioned in front and rear parallel postures. .

As shown in FIGS. 1 and 2, the means for positioning the both operation shafts (6A) and (6B) in the axial direction has first and second notches (7A) and (7B). One plate-shaped positioning member (7)
To the peripheral grooves (6a) and (6b) formed on the operation shafts (6A) and (6B) corresponding to the peripheral edges (8A) and (8B) of the notches (7A) and (7B), respectively. To fit, the mission case (4) through one bolt (9)
It is a means to attach to.

Of the two notches (7A) and (7B), the first cut corresponding to the first operation shaft (6A) supported by the first split case portion (4A) on the side where the positioning member (7) is not bolted Notch (7A) is in the state where the positioning member (7) is attached to the mission case (4).
It is formed in a U-shape that opens to the side edge of the positioning member (7) toward the case dividing direction (horizontal direction) that coincides with the inter-axis direction of both operation shafts (6A) and (6B).

The second notch (7B) on the other side is in the direction along the arc around the axis of the bolt (9) when the positioning member (7) is attached to the mission case (4), that is, FIG. In the state shown in the inside, it is formed in a substantially U-shape that opens downward to the edge of the positioning member (7).

Also, the first and the first cutout portions (7A) and (7B) are so arranged that the cutout dimensions are such that they are engaged on both sides of the first and second operation shafts (6A) and (6B) in the axial radial direction. It is set.

Of the peripheral edge (8A) in the first cutout portion (7A), FIG. 1 (B)
In the state shown in, the peripheral edge portions (8a) that vertically face each other.
Is a straight groove along the left-right direction so that it follows the arc around the axis of the bolt (9), and the circumferential groove (6a)
The upper curved peripheral edge portion (8b) of the peripheral edge (8B) in the second cutout portion (7B) has a diameter substantially equal to the diameter of the bottom portion of the peripheral groove (6b). It is formed in a semi-circle.

According to the above configuration, as shown in FIGS. 1 (a) and 1 (b), first, the peripheral edge (8A) of the first cutout portion (7A) is formed in the circumferential groove (6a) of the first operating shaft (6A). ), And then the positioning member (7) is swung around the first operating shaft (6A) so that the peripheral edge (8b) of the second cutout portion (7B).
Is engaged with the circumferential groove (6b) of the second operation shaft (6B), and in this state, the positioning member (7) is fixed with the bolt (9).
By attaching to (4), both operating shafts (6A) and (6B) are positioned.

Since the upper curved peripheral edge portion (8b) of the peripheral edge (8B) of the second cutout portion (7B) is formed in a semicircular shape having a diameter substantially equal to the diameter of the bottom portion of the peripheral groove (6b), the second cutout portion is formed. The peripheral edge (8B) of the portion (7B) can be engaged with the circumferential groove (6b) with sufficient engagement margins on both sides in the axial radial direction to reliably position the operating shaft (6B) in the axial direction. it can.

In addition, since the facing peripheral edge portion (8a) of the first cutout portion (7A) is formed in a straight posture along the case dividing direction, the assembling error of each divided case portion (4A), (4B), etc. Despite the variation in the distance between the two operating shafts (6A) and (6B) caused by the above, the vertical engagement depth of the peripheral groove (6a) of the facing peripheral edge (8a) can be maintained constant. Thus, the operation shaft (6A) can be securely engaged with each other and the positioning of the operation shaft (6A) in the axial direction can be surely performed.

In addition, since the facing peripheral edge portion (8a) of the first cutout portion (7A) is formed in a straight posture along the case dividing direction, the assembling error of each divided case portion (4A), (4B), etc. Despite the variation in the distance between the two operating shafts (6A) and (6B) caused by the above, the vertical engagement depth of the peripheral groove (6a) of the facing peripheral edge (8a) can be maintained constant. Thus, the operation shaft (6A) can be reliably engaged and the positioning of the operation shaft (6A) in the axial direction can be surely performed.

As shown in FIG. 3, a battery (10) is mounted on the front part of the threshing device (2), and the fixing means of this battery (10) is, as shown in FIG. 4 and FIG. Battery Mount (11)
A stay (13) that prevents rearward movement of the on-board battery (10) and is covered by a part of the metal fitting (12) placed on the upper part of the battery (10) at the bent portion (13A) at the upper end thereof. The bolt
(14) via the mounting base (11) to the front of the mounting base (11) is connected to the locking piece (11a) at one end via the metal fitting (15a), and the stay (13) The mounting battery (10) can be mounted by locking the locking part (13a) bent at the tip of the bent part (13A) through the metal fitting (15b) at the other end.
(1) and stay (13) with elastic band (1
It is a means to provide 5).

[Brief description of drawings]

1 to 5 show an embodiment of an operating shaft mounting structure for a steering clutch according to the present invention, and FIGS. 1 (a) and 1 (b) are vertical cross-sectional rear views showing the mounting procedure of a positioning member. 2 is a sectional view taken along the line II-II in FIG. 1 (b), FIG. 3 is a side view of a main part of the combine, FIG. 4 is an enlarged side view of a part of the main part,
FIG. 5 is an exploded perspective view of a main part. 6 and 7 show
It is a longitudinal rear view of a main part showing a conventional example, respectively. (4) …… Mission case, (4A) …… First split case part, (4B) …… Second split case part, (5A), (5B) …… Steering clutch, (6A) …… First Operation axis, (6B) …… Second operation axis,
(6a), (6b) ... circumferential groove, (7) ... positioning member, (7A) ... first notch, (7B) ... second notch, (8A), (8B) ... … Perimeter, (9) …… Bolt.

Claims (1)

[Scope of utility model registration request] 1. A mission case (4) is constructed by attaching a second divided case portion (4B) to a first divided case portion (4A), and the first and second divided case portions (4A), (4B). , The left and right steering clutches (5A) by rotating around their axes,
The first and second operation shafts (6A) and (6B) that insert and cut (5B) are supported in a state in which they are positioned in parallel to each other, and these both operation shafts (6A) and (6B) are the axial cores. One plate-shaped positioning member (7) having the first and second cutouts (7A) and (7B) formed so as to be positioned in the direction of the cutouts (7A) and (7B). The second split case portion (4B) with the peripheral edges (8A) and (8B) engaged with the circumferential grooves (6a) and (6b) formed in the corresponding operation shafts (6A) and (6B), respectively. In the operating shaft mounting structure for the steering clutch, which is mounted to the first via a single bolt (9), the eleventh notch (7) corresponding to the first split case (4A) is provided.
A), the positioning member (7) is the second split case portion
In the state where it is attached to (4B), both operation shafts (6A),
The first operation shaft (6A) is opened toward the side away from the bolt (9) along a line segment connecting the shaft centers of (6B).
Is formed in a U shape that engages with the circumferential groove (6a) on both sides in the radial direction of the second notch portion (7) corresponding to the second split case portion (4B).
B), the positioning member (7) is the second split case portion
(4B) is opened in a direction along an arc around the shaft center of the bolt (9) when attached to the second operation shaft.
An operating shaft mounting structure for a steering clutch, which is formed in a U-shape that engages with the circumferential groove (6b) on both sides in the radial direction of (6B).