JPH0716906Y2 - Seal cover for fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a seal cover used for a joint.

[Problems to be solved by conventional techniques and devices]

In recent years, as a seal cover of this type, an armadillo type cover using a plurality of spherical shells has been proposed (Japanese Patent Laid-Open No. Sho 61-206).
No. 62-200024), this prior art has only insufficient measures taken for the sealing property, so external muddy water and dust are likely to enter, and lubricant is likely to leak. However, there is a problem that the lubrication tends to be insufficient because no specific measures are taken, and the biaxial eccentricity (planned articulated motion due to the inflexibility of the spherical shell). However, there is a problem that it is difficult to secure a smooth sliding motion.

In order to deal with these problems, the inventors of the present invention first
As shown in FIG. 3, the outer race (3) is a joint in which the input shaft (1) and the output shaft (2) are connected to each other so that they can move in an articulated manner, and the outer surface (3a) is spherical. In a seal cover that is externally attached to the one connected to one shaft (2), the outer race (3) is provided near one end (6a) on the large diameter side of the spherical shell body (6) having a substantially bowl shape. A sliding portion (7) having a spherical inner surface (7a) that slides with a spherical outer surface (3a) is provided, and the other end (6b) on the small diameter side is externally fitted and fixed to the other shaft (1). A spherical shell (5) made of a non-flexible material provided with a portion, and a seal portion arranged on the outer end face side of the sliding portion (7) near one end portion (6a) of the spherical shell body (6) ( 9) Seal seal for joint consisting of (Japanese Patent Application No. 1-57617)
No.) or as shown in FIG. 4, the outer race (3a) is a joint in which an input shaft (1) and an output shaft (2) are connected to each other so that they can move in an articulated manner. 3)
In a seal cover that is externally inserted into the one that is connected to the one shaft (2), a spherical inner surface (4c) that slides with the spherical outer surface (3a) of the outer race (3) is provided, and A first spherical shell (4) made of a non-flexible material, provided with a spherical groove (4d) opening at the end on the shaft (1) side, and one end (8a)
Is slidably inserted into the spherical groove (4d), and the other end (8
b) in the vicinity of one end (4a) of the second spherical shell (8) made of a non-flexible material that is externally fitted to the other shaft (1) and the first spherical shell (4). Placed and said outer race (3)
A first seal portion (9) contacting the spherical outer surface (3a) of
A second seal portion (10) arranged near the other end (4b) of the first spherical shell (4) and in contact with the spherical outer surface (8c) of the second spherical shell (8). An outer surface of a joint seal cover (Japanese Patent Application No. 1-57618) or a joint in which an input shaft (1) and an output shaft (2) are connected to each other so that they can articulate as shown in FIG. In a seal cover which is externally attached to the outer race (3) having a spherical shape (3a) connected to the one shaft (2), the spherical shell main body (6) is provided with the above-mentioned structure near the one end (6a). Outer race (3)
A non-flexible first spherical shell (4) provided with a sliding portion (7) having a spherical inner surface (7a) that slides with the spherical outer surface (3a) of
And one end (8a) slidably contacts the spherical inner surface (6c) of the spherical shell body (6), and the other end (8b) is externally fitted to the other shaft (1). The second spherical shell (8) made of a non-flexible material and the first spherical shell (4) are arranged on the outer end face side of the sliding portion (7) in the vicinity of one end portion (4a) of the first spherical shell (4). A first seal portion (9) that contacts the spherical outer surface (3a) of the outer race (3) and the other end portion (4) of the first spherical shell (4).
b) A seal cover for joint (Practical application No. 1-57619), which is arranged in the vicinity and has a second seal portion (10) that contacts the spherical outer surface (8c) of the second spherical shell (8). I devised it,
The present invention is a further improvement of these inventions.

That is, in the seal cover shown in FIGS. 3 to 5, the spherical shell body (6, FIG. 3) and the second spherical shell (8, FIGS. 4 and 5) are both at the other end ( 6b)
At (8b), it is fitted over the input shaft (1) so that it cannot move relative to the input shaft (1). On the other hand, the input shaft (1) and the output shaft (2) may have axial play or play, in which case the spherical shell body (6) and the second spherical shell (8) are input. When it moves together with the shaft (1), there is a problem that sliding resistance increases in each sliding portion and seal portion, which causes inconvenience such as heat generation and wear.
The axial play in the input shaft (1) and the output shaft (2) is mainly due to the following reasons. That is, as shown in FIGS. 6 and 7, the input shaft (1) is connected to the angular circlip (1
2) and circular circlip (13) for inner race (1
It is fixed to 4), and the circlip (12) (13) is engaged with the annular groove (15) (16) formed on the peripheral surface of the input shaft (1). Since the diameter (d) of the clip (13) may be smaller than the axial width (l) of the annular groove (16), in this case the axial play between the input shaft (1) and the output shaft (2) is reduced. Occurs.

[Means for Solving the Problems]

In view of the above points, the present invention has been devised to solve the problems found in the above-mentioned prior art, and in order to achieve this object, the spherical shell body or the second spherical shell is attached to the other shaft. A rubber-like elastic material mounting member having a bellows part is used for the externally slidable insertion.

That is, the seal cover according to the first aspect is a joint in which an input shaft and an output shaft are connected to each other so that they can articulate, and an outer race having a spherical outer surface is connected to the one shaft. In a seal cover to be inserted, a sliding portion having a spherical inner surface that slides with a spherical outer surface of the outer race is provided near one end on the large diameter side of a spherical shell main body having a substantially bowl shape, and the other end on the small diameter side. Has a spherical shell made of a non-flexible material slidably externally inserted to the other shaft, and a rubber-like elastic material mounting member for mounting the other end of the small diameter side to the other shaft, It is characterized in that the mounting member is composed of a portion fitted to the other end portion, a portion fitted to the other shaft, and a bellows portion set between the both portions.

The seal cover according to the second aspect is a joint in which an input shaft and an output shaft are connected to each other so as to move in an articulated manner, and an outer race having a spherical outer surface is connected to the one shaft. In the seal cover that is externally inserted into, a spherical inner surface that slides with the spherical outer surface of the outer race is provided,
And a first spherical shell made of a non-flexible material having a spherical groove open at the other end on the shaft side, one end slidably inserted in the spherical groove, and the other end being the other end. A second spherical shell made of a non-flexible material slidably externally fitted to the shaft of No. 2, and a mounting member made of a rubber-like elastic material for mounting the other end of the second spherical shell to the other shaft. The mounting member has a portion fitted to the other end portion, a portion fitted to the other shaft, and a bellows portion set between the both portions. To do.

The seal cover according to the third aspect is a joint in which an input shaft and an output shaft are connected to each other so that they can move in an articulated manner, and an outer race having a spherical outer surface is connected to the one shaft. In the seal cover to be externally inserted to the first spherical shell made of a non-flexible material, a first spherical shell made of a non-flexible material is provided in the vicinity of one end of the spherical shell main body with a sliding portion having a spherical inner surface that slides with the spherical outer surface of the outer race. A second spherical shell made of a non-flexible material, the second spherical shell being slidably contacted with the spherical inner surface of the spherical shell main body, and the other end being slidably inserted on the other shaft. A mounting member made of a rubber-like elastic material for mounting the other end of the spherical shell to the other shaft, the mounting member being fitted to the other end and the other shaft. And a bellows portion set between the two portions.

[Action]

When the spherical shell main body or the second spherical shell is externally slidably fitted to the other shaft and a mounting member made of a rubber-like elastic material having a bellows part is used for its mounting, the bellows part expands and contracts. Thus, it is possible to absorb the play between the input shaft and the output shaft and play.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows the main part of the seal cover corresponding to FIG. 4 or FIG. 5, and shows the other end (8b) of the second spherical shell (8).
Is slidably inserted into the input shaft (1), and the other end (8b)
Ring-shaped mounting member (11) molded from rubber-like elastic material
Is attached to the input shaft (1). The mounting member (11) is a portion (11a) fitted to the other end (8b).
And a portion (11b) fitted to the other shaft (1),
It consists of a bellows part (11c) set between both parts (11a) and (11b), and expansion and contraction of the bellows part (11c) prevents play and play between the input shaft (1) and the output shaft (2). Absorb. The other end (8b) is provided with a protrusion (8d) that axially engages with the fitting portion (11a). The mounting member (11) also serves as a seal portion for preventing the lubricant filled in the cover from leaking to the outside and the dust from entering the cover. The other structure is similar to that of FIG. 4 or FIG. Further, the mounting member (11) can be applied to the sial cover shown in FIG. 3 as it is. Further, as shown in FIG. 2, the bellows portion (11c) of the mounting member (11) may be convex toward the inner diameter direction.

[Effect of device]

As described above, the seal cover of the present invention is made of a rubber-like elastic material having a spherical shell body or a second spherical shell externally slidably fitted to the other shaft and having a bellows portion for its attachment. By using a mounting member, expansion and contraction of the bellows part absorbs play and play between the input shaft and the output shaft to suppress heat generation and wear, and with this, the durability of the cover. Can be increased.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part of a seal cover according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of a seal cover according to another embodiment of the present invention, and FIGS. FIG. 6 is a sectional view showing a fitted state of a seal cover according to the prior art, FIG. 6 is a sectional view of a joint, and FIG. 7 is a partially enlarged view of FIG. (1) Input shaft, (2) Output shaft (3) Outer race, (3a) (8c) Spherical outer surface (4) First spherical shell, (4c) (6c) (7a) Spherical inner surface (4d) Spherical groove , (5) Spherical shell, (6) Spherical shell body (7) Sliding part, (8) Second spherical shell, (8d) Protrusion (9) (10) Seal part, (11) Mounting member (11a) (11b) Fitting part, (11c) Bellows part, (12) Square circlip, (13) Round circlip, (14) Inner race, (15) (16) Annular groove

Claims (3)

[Scope of utility model registration request] 1. An outer race (3) having a spherical outer surface (3a) which is a joint in which an input shaft (1) and an output shaft (2) are connected to each other so that they can move in an articulated manner. In a seal cover to be externally attached to the one connected to (2), the spherical outer surface of the outer race (3) is provided near one end (6a) on the large diameter side of the spherical shell main body (6) having a substantially bowl shape. Sliding part (7) having a spherical inner surface (7a) that slides with 3a)
A spherical shell (5) made of a non-flexible material, the other end (6b) on the small diameter side being slidably inserted on the other shaft (1), and the other end (6b) on the small diameter side. ) Is attached to the other shaft (1), and a mounting member (11) made of a rubber-like elastic material is provided. The mounting member (11) is fitted to the other end (6b) (11a). ) And a portion (11) fitted to the other shaft (1).
b) and a bellows portion (11c) set between the two portions (11a) and (11b), the seal cover for a joint. 2. An outer race (3) having a spherical outer surface (3a), which is a joint in which an input shaft (1) and an output shaft (2) are connected to each other so as to move in an articulated manner. In a seal cover that is externally inserted to the one connected to (2), a spherical inner surface (4c) that slides with the spherical outer surface (3a) of the outer race (3) is provided, and the other shaft (1) side A first spherical shell (4) made of a non-flexible material having a spherical groove (4d) opening at the end of, and one end (8a) slidably inserted into the spherical groove (4d), A second non-flexible material, the other end (8b) of which is slidably inserted on the other shaft (1).
And a mounting member (11) made of a rubber-like elastic material for mounting the other end (8b) of the second spherical shell (8) to the other shaft (1). The mounting member (11) is
It is set between a portion (11a) fitted to the other end portion (8b), a portion (11b) fitted to the other shaft (1), and the both portions (11a) (11b). A seal cover for a joint, characterized by comprising a bellows part (11c). 3. An outer race (3) having a spherical outer surface (3a), which is a joint in which an input shaft (1) and an output shaft (2) are connected to each other so as to move in an articulated manner. In a seal cover externally inserted to the one connected to (2), a spherical inner surface (sliding with a spherical outer surface (3a) of the outer race (3) near one end (6a) of the spherical shell body (6) ( A first spherical shell (4) made of a non-flexible material provided with a sliding part (7) having a 7a) and one end (8a) slid on the spherical inner surface (6c) of the spherical shell body (6). A second spherical shell (8) made of a non-flexible material, which is movably contacted and the other end (8b) is slidably externally fitted to the other shaft (1); And a mounting member (11) made of a rubber-like elastic material for mounting the other end (8b) of (8) to the other shaft (1), the mounting member (11) being the other end (8b). ) To Fitting part (11
a) and a portion (11b) fitted to the other shaft (1)
And a bellows portion (11c) set between the both portions (11a) and (11b), the seal cover for a joint.