JP2002213616A - Sealing device for vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of sealing performance with inferior follow-up character by an O-ring, when the connection end face of a case is sealed. SOLUTION: A groove 14 is formed in a connection end face 11A of a case 11, this groove 14 is charged with a liquid gasket 13 for aged hardening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body sealing device, and more specifically, to a traveling work vehicle constructed by fastening a plurality of transmission cases with a gasket interposed at a joint end face of the transmission case. The present invention relates to a sealing device for a vehicle body.

[0002]

2. Description of the Related Art A vehicle body of a traveling work vehicle such as a tractor or the like is fastened by fastening means such as bolts and nuts by abutting joint end surfaces of a clutch housing and a transmission case (hereinafter, collectively referred to as a transmission case). This constitutes the vehicle body. Since this vehicle body uses an oil tank such as lubricating oil and hydraulic oil in combination, a gasket is interposed (sandwiched) at the interface of the joining end surface, the gasket is compressed by fastening means, and the seal at the interface (oil) Leak prevention).

[0003]

As the gasket, an O-ring (elastic ring having a circular cross section), an oil seal, a liquid gasket and the like have been generally employed. However, when an O-ring or an oil seal is employed, when an external force or the like acts on the interface, the interface is poor in followability with respect to misalignment, opening, etc.
There was a possibility that the sealing performance was reduced and oil leakage occurred.
Further, when a liquid gasket was applied to the joint end face, the film pressure was limited, and the seal film was broken.

In particular, when a front loader, a backhoe, or the like is mounted on a traveling work vehicle such as a tractor, a tensile force due to an external force acts on an upper surface of a case constituting a vehicle body, and a surface pressure between bolt pitches for fastening the case. There was a risk of oil dropping between the cases (interface) due to a decrease and minute opening. The present invention relates to a sealing device in which a liquid gasket is applied to a joint end face and is cured over time to prevent oil leakage. By integrating a thin seal film made of a liquid gasket and a thick sealing material (liquid gasket or rod-shaped gasket) in the groove, the case (interface) is exposed to external force.
It is an object of the present invention to provide a sealing device corresponding to the minute opening of the above.

[0005]

The present invention is directed to a vehicle body in which a plurality of transmission cases are fastened by interposing a gasket at an interface of a joint end surface of a transmission case and the interface is sealed by the gasket. In order to achieve the above-mentioned object,
The following technical measures have been taken: That is, in the sealing device for a vehicle body according to the first aspect, the sump groove 14 of the liquid gasket 13A is formed in the joint end face 11A, and the sump groove 14 is filled with the liquid gasket 13A and the joint end face 11A.
A is coated with a liquid gasket 13B, and the interface of the joint end face 11A is sealed by curing the liquid gaskets 13A and 13B.

By adopting such a configuration, when the liquid gasket 13A filled in the sump groove 14 and the liquid gasket 13A applied to the joint end face 11A are hardened, the former gasket 13A has a thick (large wall) seal. In the material 13C, the latter gasket 13A is a thin (small thickness) sealing material 13B, which is integrated when cured, and the thick sealing material 13C follows the decrease in the surface pressure between the bolt pitches and the minute opening. To prevent oil leaks. Specifically, when the liquid gasket 13A filled in the reservoir groove 14 is cured, the applied liquid gasket 13A
A is integrated with the cured thin seal 13B, and the pool groove 1 is formed.
The elastic deformation of the sealing material (gasket) 13C of No. 4 is allowed, and the sealing performance corresponding to the external force is ensured to prevent oil leakage.

It is recommended that the reservoir groove 14 is formed on one of the joint end surfaces 11A (claim 2). That is, the pool grooves 14 may be formed on both (butted against) the joint end surfaces 11A, and the pool grooves 14 may be opposed to each other. However, in this case, the pool grooves 14 are misaligned (displaced). In some cases, the pool groove 14 is formed on one of the joint end faces 11A, and the joint end face 11A opposed to the pool groove 14 is desirably a flat surface.

[0008] However, the pool groove 14 is formed in both joint end surfaces 11A.
Is formed, the reservoir groove 14 can be made to abut against a flat surface (flat surface) of the other opposing joint end surface 11A. Furthermore, in the sealing device for a vehicle body according to claim 3, a housing groove 15 for a rod-shaped gasket 16 is formed in the joint end face 11A, and the rod-shaped gasket 16 is fitted in the groove 15 and a liquid gasket 13B is applied to the joint end face 11A. The liquid gasket 13B is cured and the bar-shaped gasket 16 seals the interface of the joint end face 11A.

By employing the rod-shaped gasket 16 as described above, it is not necessary to prevent air pools when filling the liquid gasket (management of air enclosing), and the rod-shaped gasket 16 and the applied liquid gasket 13A are eliminated. This ensures stable sealing performance due to the integration with the substrate. The properties (properties) of the rod-shaped gasket 16 and the liquid gasket 13A may be the same or different, and the liquid gasket 1
It is also possible to apply the 3A thinly and then fit the rod-shaped gasket 16 therein.

The rod-shaped gasket 16 may form a deformation relief portion 16B which is compressed and elastically deformed when fastening a pair of joint end surfaces 11A to a shaft sealing lip 16A which elastically contacts the groove wall. Recommended (claim 4). With this configuration, when the bar-shaped gasket 16 is compressed, the lip 16A and the deformation relief portion 16B
The sealing performance is improved, and a reliable seal is promised. Further, it is desirable that the accommodation groove 15 is formed on one of the joint end surfaces 11A (Claim 5), and the sump groove 14 and the accommodation groove 15 are formed as narrow grooves extending in the width direction of the vehicle body 4. It is recommended to be formed on the joint end face 11A on the upper side of the fourth (claim 6).

The sump groove 14 and the accommodation groove 15 can be formed in a circumferential groove over the entire periphery of the joint end face 11A. Not only reduces the
It is possible to ensure the sealing performance of the minute gap caused by the external tensile force acting on the upper part of the fin. The liquid gasket 13A
Is used to fill the sump groove 14 and the joint end face 1
When applying to 1A, it is recommended to be in the form of paste or gel (claim 7).

Since the liquid gasket 13A is used, it can be applied uniformly. This liquid gasket is a liquid (paste, slurry, gel) of an elastic material (elastomer) such as rubber or resin, and is cured by natural drying or the like after application, and elastically deformed after curing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of an embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a side view of the entire configuration of the traveling work vehicle 1 exemplified by a TLB (tractor / loader / backhoe) in which a front loader L is mounted on the front of the tractor T and a backhoe B is mounted on the rear.
Shows a plan view (however, backhoe B is omitted). The traveling work vehicle 1 is a two-axis four-wheel type having left and right front wheels 2 and left and right rear wheels 3. The left and right front wheels 2 are steered wheels and are driven by four wheels driven together with the left and right rear wheels 3. It is shaped.

A driving control device having a control handle 5 and a driver's seat 6 is provided on the vehicle body 4, and a control device 7 for operating the front radar L is provided for forward driving, and the driver's seat 6 is moved back and forth. Backhoe B during reverse driving
, Which is protected by a four-post safety frame 9. Body 4
As shown in FIG. 2, a clutch housing 10 connected to the rear surface of the engine by bolt fastening means and four transmission cases 11 (11-1 to 11-4) are joined to the clutch housing 10 in the figure. End face 11A (1
1A-1 to 11A-4), and their fastening surfaces are fastened by bolt fastening means 12.

The portion indicated by an arrow in FIG. 2 is a portion for fastening a plurality of transmission cases 11, and the clutch housing 10
Are joined together, so that there are four fastening portions (joining surfaces) and they are joined to each other on a vertical surface in parallel with each other. Lubricating oil and hydraulic oil are contained in the vehicle body 4 including the transmission case. To seal this oil, that is, to prevent oil leakage, a gasket 13 is provided between the interface of the joint end surface 11A and the case end surface. It has a sealing device that is sandwiched and compressed by the fastening force of the fastening means 12 to prevent oil leakage.

The vehicle body components such as the clutch housing and the transmission case are so-called flat cases whose width is larger than the height as illustrated in FIG. 1A, and are cast products. In this example, bolt fastening holes 11B are formed at a predetermined pitch, and knock holes 11C for positioning pins are formed. That is, bolt fastening holes 11B are drilled in symmetrical arrangement at upper and lower left and right positions, bolt fastening holes 11B are drilled at left, right, upper and lower corners, and knock holes 11C are drilled at left and right walls. Are overlapped with each other (butted against each other), and the vehicle body 4 is assembled and configured by fastening bolts to the bolt fastening holes 11B in a state of being positioned by the knock pins inserted into the knock holes 11C.

The joining end face 11A of the casting case is machine-finished and coated with a liquid gasket 13A, and the applied liquid gasket 13A is cured with time to form a thin sealing film 13B. A sump groove 14 for filling the liquid gasket 13A is formed on one or both of the joining end faces 11A by machining or the like, and the liquid gasket 13A filled in the sump groove 14 is hardened with time to provide a thick sealing material ( A layer 13C is formed, and as shown in FIG. 1B, the sealing film 13B and the sealing material 13C are integrated to form a sealing material.

The sealing film 13B has a joint end face 11A which is opposed thereto.
However, when an external force acts on the thin film, the surface pressure is reduced due to a small amount of elastic deformation and the sealing function is reduced. However, a thick seal 13C is integrated with the seal film 13B. Since the elastic deformation (elongation and contraction) of the layer 13C is large even when an external force is applied, the sealing function is reliably maintained. Here, the reservoir groove 14 is a rectangular groove having a depth of about 1 mm and a width of about 4 mm, and a narrow groove extending in the width direction of the vehicle body 4 at a position slightly shifted outward from the center of the width of the joint end face 11A. The groove is formed on the joint end surface 11A on the upper side of the vehicle body 4.

The sump groove 14 is formed between all of the vertical and horizontal bolt pitches (between the bolt fastening holes 11B) (in FIG. 1 (1), since the case is a flat octagon, the eight joint end faces 11) are formed.
A) can also be formed, but in the loading work by the loader and the excavation work by the backhoe in the traveling work vehicle 1, the tensile force acts on the upper side of the vehicle body 4 as an external force. A reservoir groove 14 is formed in 11A, and the groove 14 is filled with a liquid gasket 13, which hardens over time to become an elastic sealing material. Further, the pool groove 14 can be formed on both of the joint end faces 11A facing each other, but is formed only on one of the joint end faces 11A.
It is advantageous in terms of assembling or the like that the surface facing this is a flat surface.

Of course, when formed on both joint end surfaces 11A, the pool grooves 14 are formed so as to be shifted from each other.
The surface facing the groove 14 can be a flat surface, and in such a configuration, the thick seal layers 13C are advantageously formed so as to alternately bulge on both surfaces of the seal material. Here, the liquid gasket refers to an elastic elastomer such as a slurry, paste, or gel rubber, resin, or the like, which is dried and hardened with time after filling or coating.

Further, in the present invention, as shown in FIG. 1 (3), a rectangular groove having a depth of about 3 mm and a width of about 4 mm is formed in the joint end face 11A in the same manner as the above-described reservoir groove 14 in the housing groove 15.
The gasket 16 can be sealed by fitting a gasket 16 into the groove 15. This rod-shaped gasket 1
Adopting No. 6 is advantageous because there is no problem with air filling when filling the liquid gasket. The rod-shaped gasket 16 may have any cross-sectional shape as long as it fits into the groove 15, and has a plurality of steps of shaft sealing lips 16 </ b> A that elastically contact the groove wall in a streak shape. It is desirable to form a deformation relief portion 16B that is compressed when bolted to allow elastic deformation and form a tapered portion 16C at the insertion end to facilitate insertion (fitting).

When this rod-shaped gasket 16 is employed, the rod-shaped gasket 16 can be fitted into the groove 15 with the liquid gasket applied thinly, or the rod-shaped gasket 16 can be inserted into the groove 15 without applying the liquid gasket to the groove. It can also be fitted. Also, when the rod-shaped gasket 16 is fitted into the groove 15, the bulging portion 16D is connected to the joint end face 11A.
The protrusion S is compressed by the fastening force, and a liquid gasket is applied to the end face 11A.
Thus, the rod-shaped gasket 16 and the liquid gasket may be of the same type or different types.

Although the embodiment of the present invention is as described above, various design changes are possible. For example, a plurality of pool grooves 14 and housing grooves 15 can be formed parallel to each other on the joint end face 11A, and may be formed as divided grooves instead of being formed at a full pitch between bolt pitches. Further, the shapes and dimensions of the grooves 14, 15 are appropriately set according to the external force.

[0024]

As described in detail above, according to the present invention, it is possible to provide a sealing device for a vehicle body in which oil leakage from the interface at the joint end surface is reliably prevented, and the sealing performance by running on uneven terrain has been confirmed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (1) is a front view of a seal portion, and (2) is a first line AA in the seal portion.
FIG. 3 is an enlarged sectional view showing an example, and FIG. 3 (3) is an enlarged sectional view showing a second example.

FIG. 2 is a side view showing the overall configuration of the vehicle body.

FIG. 3 is an overall side view of a traveling work vehicle exemplified by TLB.

FIG. 4 is an overall plan view (however, a backhoe is omitted).
It is.

[Explanation of symbols]

 Reference Signs List 1 traveling work vehicle 4 body 11 transmission case 11A joining end face 13 gasket 13A liquid gasket 14 sump groove 15 accommodation groove 16 rod-shaped gasket

Claims (7)

[Claims] 1. A plurality of transmission cases (11) are fastened by interposing a gasket (13) at an interface of a joint end face (11A) of the transmission case (11), and the interface is sealed with a gasket (13). In the traveling work vehicle (1) having the vehicle body (4), a reservoir groove (14) for the liquid gasket (13A) is formed on the joint end surface (11A), and the liquid gasket (13A) is inserted into the reservoir groove (14). Fill and join end face (11
A sealing device for a vehicle body, wherein a liquid gasket (13B) is applied to A), and the interface of the joint end face (11A) is sealed by curing the liquid gasket (13A) (13B). 2. The vehicle body sealing device according to claim 1, wherein the pool groove (14) is formed in one of the joint end surfaces (11A). 3. A plurality of transmission cases (11) are fastened by interposing a gasket (13) at an interface of a joint end face (11A) of the transmission case (11), and the interface is sealed with a gasket (13). In the traveling work vehicle (1) having the vehicle body (4), a housing groove (15) for the rod-shaped gasket (16) is formed in the joint end surface (11A), and the rod-shaped gasket (16) is fitted into the groove (15). And a liquid gasket (13B) is applied to the joint end surface (11A), and the interface of the joint end surface (11A) is sealed by the hardening of the liquid gasket (13B) and the rod-shaped gasket (16). Sealing device. 4. A deformation relief portion which is compressed and elastically deformed when the rod-shaped gasket (16) is compressed by fastening a pair of joint end surfaces (11A) with a shaft sealing lip (16A) which comes into elastic contact with the groove wall. The sealing device for a vehicle body according to claim 3, wherein (B) is formed. 5. The sealing device for a vehicle body according to claim 3, wherein the housing groove (15) is formed in one joint end surface (11A). 6. The storage groove (14) and the accommodation groove (1).
5) The vehicle body (4) according to any one of claims 1 to 5, wherein a narrow groove extending in the width direction of the vehicle body (4) is formed on the joint end surface (11A) on the upper side of the vehicle body (4). Body sealing device. 7. The liquid gasket (13A) is used for filling the liquid gasket (13A) into the reservoir groove (14) and for joining the liquid gasket (13A).
The vehicle body sealing device according to any one of claims 1 to 6, wherein the device is in the form of a paste or a gel when applied to a body.