JPH065978Y2 - Seal cover mounting structure for transmission case in crawler traveling device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of use] The present invention has a drive shaft projecting from a bearing boss portion provided at the end of a transmission case, and the bearing boss portion on the side of the projecting portion of the drive shaft. The drive sprocket is externally fitted to the projecting shaft portion of the drive shaft in an integrally rotating state, and a retainer for preventing the drive sprocket from slipping out is provided on the projecting end portion of the drive shaft. And a removable seal cover that closes the opening end of the bearing boss is fitted into the bearing boss, and a positioning collar held between the bearing and the seal cover is attached to the drive shaft. The present invention relates to a seal cover mounting structure for a transmission case in a crawler traveling device in which an oil seal is interposed between the outer peripheral surface of the collar and the inner peripheral surface of the bearing boss portion.

[Conventional technology]

In such a seal cover mounting structure for a transmission case, conventionally, as shown in FIG. 2, a locking circumferential groove (12A) for hooking a tool such as a gear remover on the outer peripheral surface of the boss portion of the seal cover (12). To clean and inspect the bearing (3) and oil seal (9) provided in the bearing boss of the transmission case, remove the drive sprocket (4) from the drive shaft (2). , The engaging circumferential groove (12) of the seal cover (12)
The seal cover (12) can be easily removed from the drive shaft (2) by hooking a tool on A) and pulling it outward.

[Problems to be solved by the invention]

However, when the locking peripheral groove (12A) is formed on the outer peripheral surface of the boss portion of the seal cover (12), the seal cover is correspondingly formed.
The boss portion of (12) becomes longer in the drive shaft core direction, and accordingly, the distance from the bearing boss portion (1A) of the transmission case (1) to the protruding end portion of the drive shaft (2) also becomes longer. The bending moment acting on the drive shaft (2) and the bearing member such as the bearing is increased, which is one of the causes of the deterioration of durability.

An object of the present invention is to improve the durability of the drive shaft and the bearing portion by modifying the seal cover.

[Means for solving problems]

According to a characteristic configuration of the present invention, a flange portion having a diameter larger than a fitting portion into a bearing boss portion is continuously provided on an outer peripheral portion of the seal cover, and an outer end surface of the bearing boss portion and the seal cover are in a fixed state of the seal cover. This is the point where a gap into which a tool can be inserted is formed with the flange portion of.

[Action]

That is, by providing a gap into which the tool can be inserted between the flange portion of the seal cover and the outer end surface of the bearing boss portion of the transmission case, cleaning of the bearing, oil seal, etc. provided in the bearing boss portion of the transmission case is performed. When performing inspections, etc., the seal cover can be easily removed from the drive shaft by removing it from the drive shaft, inserting a tool into the gap, and pushing the seal cover toward the protruding end of the drive shaft. Of.

[Effect of device]

Therefore, while the width of the seal cover in the axial direction is set to the minimum width necessary for closing the opening end of the bearing boss portion and externally fittingly holding the drive shaft in a stable posture, Within this axial width, a gap for inserting a tool can be formed between the flange part that is continuous with the seal cover and the outer end face of the bearing boss part, so that it is locked to the outer peripheral surface of the seal cover boss part. The distance from the bearing boss of the transmission case to the projecting end of the drive shaft can be shortened compared to the conventional case where the circumferential groove is formed, and the bending moment acting on the drive shaft and the bearing member such as the bearing can be reduced. It has become possible to improve durability by making it as small as possible.

〔Example〕

FIG. 1 shows a drive unit of the crawler traveling device,
The drive section will be described in detail below.

The drive shaft (2) is projected from the bearing boss (1A) provided at the end of the transmission case (1), and the protruding end side of the drive shaft (2) is fitted into the bearing boss (1A). The drive sprocket (4) is supported by a fixed bearing (3), and the drive sprocket (4) is externally fitted to the protruding shaft portion of the drive shaft (2) in an integrally rotating state.
Bolt the retainer (5) that prevents the escape movement of (4).
(6) Attached to the projecting end of the drive shaft (2), and closing the open end of the bearing boss (1A) to prevent dirt from entering the transmission case (1). 7) is fitted into the bearing boss portion (1A), and a positioning collar is sandwiched between the bearing (3) and the seal cover (7).
(8) is fitted onto the drive shaft (2), and a transmission case (1) is provided between the outer peripheral surface of the collar (8) and the inner peripheral surface of the bearing boss portion (1A).
An oil seal (9) for the stored oil is provided inside.

To describe the seal cover (7) in detail, a flange portion (7B) having a larger diameter than the fitting portion (7A) to the bearing boss portion (1A) is continuously provided on the outer peripheral portion of the seal cover (7), In the fixed state of the cover (7), a tool insertable gap (10) is formed between the outer end surface of the bearing boss portion (1A) and the flange portion (7B) of the seal cover (7), and a seal is formed. When removing the cover (7), after removing the drive sprocket (4), remove the seal cover (7) from the drive shaft (2) while inserting a tool such as a screwdriver into the gap (10) and prying it open. Of.

Incidentally, (11) shown in FIG. 1 is a crawler belt.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a seal cover mounting structure of a transmission case in a crawler traveling device according to the present invention. FIG. 1 is a vertical sectional view and FIG. 2 is a vertical sectional view showing a conventional example. (1) …… Transmission case, (1A) …… Bearing boss, (2) …… Drive shaft, (3) …… Bearing, (4) …… Drive sprocket,
(5) …… Prevention device, (7) …… Seal cover, (7A) …… Insertion part, (7B) …… Flange part, (8) …… Color, (9) …… Oil seal, (10 )……gap.

Claims (1)

[Scope of utility model registration request] 1. A drive shaft (2) is projectingly provided from a bearing boss (1A) provided at an end of a transmission case (1), and the projecting side of the drive shaft (2) is the bearing boss (1). 1A) bearings
(3) The drive sprocket (4) is externally fitted to the protruding shaft portion of the drive shaft (2) in an integrally rotating state, and the retainer prevents the drive sprocket (4) from moving out.
(5) is attached to the projecting end of the drive shaft (2), and a removable seal cover 7 for closing the opening end of the bearing boss (1A) is fitted into the bearing boss (1A), A positioning collar (8) sandwiched between (3) and the seal cover (7) is fitted onto the drive shaft (2), and the outer peripheral surface of the collar (8) and the bearing boss ( 1A) has an oil seal (9) between it and the inner peripheral surface of the seal cover mounting structure of the transmission case in the crawler traveling device, the bearing boss (1A ) A flange portion (7B) having a larger diameter than the fitting portion (7A) is continuously provided, and the outer end surface of the bearing boss portion (1A) and the seal cover (7) in the fixed state of the seal cover (7). A seal cover mounting structure for a transmission case in a crawler traveling device in which a tool insertable gap (10) is formed between the flange portion (7B) and the flange portion (7B).