JP2012067887A - Sealing device of transmission case of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device of a transmission case of an engine capable of restraining wear of an oil seal due to biting of dust.SOLUTION: In the sealing device of the transmission case of the engine, a rotating transmission shaft 2 is inserted into the transmission case 1, an inner transmission ring 4 is fitted to the outer periphery of the rotating transmission shaft 2 in the transmission case 1, a transmission shaft insertion through hole 5 is bored on a case wall 3 of the transmission case 1, the rotating transmission shaft 2 is protruded outside the transmission case 1 via the transmission shaft insertion through hole 5, an outer transmission ring 7 is fitted to the outer periphery of a projection part 6 of the rotating transmission shaft 2 outside the transmission case 1, a collar 8 is fitted to the outer periphery of the rotating transmission shaft 2 in the transmission shaft insertion through hole 5, and the oil seal 9 is fitted to the inner periphery of the transmission shaft insertion through hole 5 to make the oil seal 9 abut against the outer peripheral surface 8a of the collar 8, wherein an annular dustproof cover 25 is held between the outer transmission ring 7 and the collar 8, while assuming that an axial longitudinal direction of the rotating transmission shaft 2 is a front-back direction and a protruding direction of the rotating transmission shaft 2 is the front, and the oil seal 9 is covered from the front side thereof with the dustproof cover 25.

Description

  The present invention relates to a sealing device for an engine transmission case, and more particularly, to a sealing device for an engine transmission case that can suppress wear of an oil seal due to the biting of dust.

Conventionally, as a sealing device for an engine transmission case, a rotation transmission shaft is inserted into the transmission case, an internal transmission wheel is fitted around the outer periphery of the rotation transmission shaft in the transmission case, and a transmission shaft insertion hole is formed in the case wall of the transmission case. , Make the rotating transmission shaft project outside the transmission case through the transmission shaft insertion hole, fit the external transmission wheel on the outer periphery of the protruding portion of the rotation transmission shaft outside the transmission case, and on the outer periphery of the rotation transmission shaft in the transmission shaft insertion hole There is a type in which a collar is fitted, an oil seal is fitted to the inner periphery of the transmission shaft insertion hole, and the oil seal is brought into contact with the outer peripheral surface of the collar (for example, see Patent Document 1).
According to this type of sealing device, there is an advantage that oil in the transmission case can be prevented from leaking out of the transmission case through the transmission shaft insertion hole.
However, conventionally, this type of sealing device has a problem because the oil seal is exposed to the outside of the transmission case.

Japanese Utility Model Publication No. 6-22552 (refer to FIG. 1)

<Problem> The oil seal is easily worn.
Since the oil seal is exposed to the outside of the transmission case, dust outside the transmission case is likely to approach the oil seal, and the oil seal is likely to be worn by the dust that is caught in the oil seal.

  The subject of this invention is providing the sealing device of the transmission case of an engine which can suppress abrasion of the oil seal by the biting of dust.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in each of FIGS. 1 to 3 (A) to (C), the rotation transmission shaft (2) is inserted into the transmission case (1), and the rotation transmission shaft (2) is inserted into the transmission case (1). The inner transmission wheel (4) is fixed to the transmission case, a transmission shaft insertion hole (5) is formed in the case wall (3) of the transmission case (1), and the transmission case (1) is removed through the transmission shaft insertion hole (5). The outer transmission wheel (7) protrudes from the rotation transmission shaft (2), and the outer transmission wheel (7) is fitted to the protrusion (6) of the rotation transmission shaft (2) outside the transmission case (1). The collar (8) is fitted to the shaft (2), the oil seal (9) is fitted into the transmission shaft insertion hole (5), and the oil seal (9) is brought into contact with the outer peripheral surface (8a) of the collar (8). In a sealing device for an engine transmission case,
As illustrated in each of FIGS. 1 to 3 (A) and (B), the axial direction of the rotational transmission shaft (2) is the front-rear direction, and the protruding direction of the rotational transmission shaft (2) is the front.
An annular dustproof cover (25) is sandwiched between the external transmission wheel (7) and the collar (8), and the oil seal (9) is covered from the front side with the dustproof cover (25). Sealing device for engine transmission case.

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to suppress wear of the oil seal due to the biting of dust.
As shown in FIGS. 1 to 3, each of the external transmission wheels (A) and (B) is provided with the axial direction of the rotational transmission shaft (2) in the front-rear direction and the protruding direction of the rotational transmission shaft (2) as the front. 7) An annular dust cover (25) is sandwiched between the collar (8) and the oil seal (9) is covered with the dust cover (25) from the front side. Is difficult to approach the oil seal (9), and wear of the oil seal (9) due to the biting of dust can be suppressed.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> It is possible to suppress wear of the oil seal due to the biting of dust.
1 to 3, the boss (26) of the transmission shaft insertion hole (5) is projected from the case wall (3) of the transmission case (1) to the front side. Since the oil seal (9) is fitted in (26) and the outer peripheral edge (27) of the dust cover (25) is led out along the outer peripheral surface (28) of the boss (26), the transmission case (1) It is difficult for outside dust to enter between the dust cover (25) and the boss (26), and wear of the oil seal (9) due to the biting of dust can be suppressed.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> It is possible to suppress wear of the oil seal due to the biting of dust.
As shown in FIGS. 1 to 2 (A) and (B), the rear surface (29) of the dust cover (25) is provided with a protrusion (30) or a recess, and the dust cover (25) is rotated to rotate the oil. Since wind is generated by the protrusion (30) or the concave portion in front of the seal (9), the wind prevents the dust from entering the oil seal (9), and the oil seal (9) is blocked by dust biting. Abrasion can be suppressed.
In addition, there is an effect that the oil seal (9) is cooled by the flow of air near the oil seal (9) by wind.

(Invention of Claim 4)
The invention according to claim 4 has the following effects in addition to the effects of the invention according to any one of claims 1 to 3.
<Effect> It is possible to suppress wear of the oil seal due to the biting of dust.
As illustrated in FIGS. 4A and 4E, a protrusion (32) or a recess is provided on the outer peripheral surface (31) of the external transmission wheel (7), and the protrusion (32) or the recess is oil sealed ( 9) and the wind of the protrusion (32) or the recess is generated in front of the oil seal (9) by the rotation of the external transmission wheel (7). Of the oil seal (9) due to the biting of dust can be suppressed.
In addition, there is an effect that the oil seal (9) is cooled by the flow of air near the oil seal (9) by wind.

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of any one of claims 1 to 4.
<Effect> Color replacement is not required.
Since the nitriding layer is formed on the outer peripheral surface (8a) of the collar (8), the collar (8) has excellent wear resistance, and can have durability exceeding the service life of the engine. Is no longer necessary.

(Invention of Claim 6)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 5.
<Effect> Color lubricity is high.
Since the sulfuration treatment layer is provided on the outermost surface of the nitriding treatment layer, the color lubricity is high.

(Invention of Claim 7)
The invention according to claim 7 has the following effects in addition to the effects of the invention according to any one of claims 1 to 6.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in each of FIGS. 1 to 4 (A) and (B), since the axial length direction of the rotary transmission shaft (2) is the front-rear direction and the collar (8) is symmetrical, the rotational transmission shaft ( Even if the collar (8) is fitted to either end of 2), there is no mistake in assembling the collar (8), and oil leakage from the collar (8) due to this can be prevented.

<Effect> Color assembly work is simplified.
As illustrated in each of FIGS. 1 to 4 (A) and (B), since the axial length direction of the rotary transmission shaft (2) is the front-rear direction and the collar (8) is symmetrical, the rotational transmission shaft ( Even if the collar (8) is fitted into 2) from either end, no mistake in assembly of the collar (8) occurs, and the assembly work of the collar (8) is simplified.

(Invention of Claim 8)
The invention according to claim 8 has the following effects in addition to the effects of the invention according to any one of claims 1 to 6.
<Effect> Oil leakage from the collar can be prevented.
As shown in FIGS. 1, 3 and 4 (A) to (D), the internal transmission wheel (4) is prevented from rotating by the key (10) and the key groove (11) on the rotary transmission shaft (2). When inserting the collar (8) between the outer transmission wheel (7) and the inner transmission wheel (4), sandwich the gasket (12) between the collar (8) and the inner transmission wheel (4). The gasket (12) is disposed radially outside the key groove opening (14) of the end surface (13) of the internal transmission wheel (4) between the end surface (13) of the internal transmission wheel (4) and the collar (8). Since it is sandwiched, the portion radially outside the key groove opening (14) with a small sealing area can be strongly sealed with the gasket (12), and the engine oil in the transmission case (1) is rotated and transmitted. It is difficult to enter the gap between the shaft (2) and the collar (8), and oil leakage from the collar (8) can be prevented.

(Invention according to claim 9)
The invention according to claim 9 has the following effects in addition to the effects of the invention according to any one of claims 1 to 6.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 2A to 2D, the internal transmission wheel 4 is fixed to the rotary transmission shaft 2 with the key 10 and the key groove 11, and the external transmission wheel 7 ) And the internal transmission wheel (4), the O ring fitting portion (16) is provided along the outer periphery of the end face (15) of the collar (8). The O-ring (17) is fitted to the joint (16), and the O-ring (17) is disposed radially outside the key groove opening (14) of the end surface (13) of the internal transmission wheel (4). Since it is sandwiched between the end face (13) of (4) and the collar (8), the O-ring (17) strongly seals the portion radially outside the key groove opening (14) with a small sealing area. The engine oil in the transmission case (1) can hardly enter the gap between the rotary transmission shaft (2) and the collar (8), and oil leakage from the collar (8) can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the sealing device of the transmission case of the engine which concerns on 1st Embodiment of this invention, FIG. 1 (A) is a vertical side view, FIG.1 (B) is an enlarged view of the B arrow part of FIG. Fig. 1 (C) is an enlarged view of the portion indicated by arrow C in Fig. 1 (A), Fig. 1 (D) is a sectional view taken along the line DD in Fig. 1 (A), and Fig. 1 (E) is a dustproof cover. FIG. 1F is a rear view, and is a cross-sectional view taken along line FF in FIG. It is a figure explaining the sealing device of the transmission case of the engine which concerns on 2nd Embodiment of this invention, FIG. 2 (A) is a vertical side view, FIG.2 (B) is an enlarged view of the B arrow part of FIG. 2 (A). Fig. 2 (C) is an enlarged view of the portion indicated by the arrow C in Fig. 2 (A), Fig. 2 (D) is a sectional view taken along the line DD in Fig. 2 (A), and Fig. 2 (E) is a dustproof cover. FIG. 2F is a rear view, and is a cross-sectional view taken along line FF in FIG. It is a figure explaining the sealing device of the transmission case of the engine which concerns on 3rd Embodiment of this invention, FIG. 3 (A) is a vertical side view, FIG.3 (B) is an enlarged view of the B arrow part of FIG. 3 (A). Fig. 3 (C) is an enlarged view of the portion indicated by the arrow C in Fig. 3 (A), Fig. 3 (D) is a sectional view taken along the line DD of Fig. 3 (A), and Fig. 3 (E) is a dustproof cover. It is a rear view. It is a figure explaining the sealing device of the transmission case of the engine which concerns on 4th Embodiment of this invention, FIG. 4 (A) is a vertical side view, FIG.4 (B) is an enlarged view of the B arrow part of FIG. 4 (A). 4 (C) is an enlarged view of the portion indicated by the arrow C in FIG. 4 (A), FIG. 4 (D) is a sectional view taken along the line DD of FIG. 4 (A), and FIG. 4 (E) is FIG. It is the EE sectional view taken on the line of A).

    1-4 is a figure explaining the sealing device of the transmission case of the engine which concerns on 1st-4th embodiment of this invention, and this embodiment demonstrates the sealing device of the timing transmission gear case of a diesel engine. .

The configuration of the first embodiment shown in FIG. 1 is as follows.
As shown in FIGS. 1A to 1C, the rotary transmission shaft (2) is inserted into the transmission case (1), and the internal transmission wheel (2) is connected to the rotary transmission shaft (2) in the transmission case (1). 4) is fixed, a transmission shaft insertion hole (5) is made in the case wall (3) of the transmission case (1), and the rotational transmission shaft (2) is moved out of the transmission case (1) through the transmission shaft insertion hole (5). ), The outer transmission wheel (7) is fitted to the protrusion (6) of the rotary transmission shaft (2) outside the transmission case (1), and the rotary transmission shaft (2) is inserted into the transmission shaft insertion hole (5). The collar (8) is fitted, the oil seal (9) is fitted in the transmission shaft insertion hole (5), and the oil seal (9) is brought into contact with the outer peripheral surface (8a) of the collar (8).
A nitriding layer is formed on the outer peripheral surface (8a) of the collar (8). For this reason, the wear resistance of the collar (8) is excellent, the durability exceeding the service life of the engine can be obtained, and the replacement of the collar (8) becomes unnecessary.
A sulfuration treatment layer is provided on the outermost surface of the nitridation treatment layer. For this reason, the lubricity of the collar (8) is high.

The transmission case (1) is a timing transmission gear case (33), and a timing transmission gear train is accommodated in the timing transmission gear case (33).
The rotation transmission shaft (2) is a crankshaft (34).
The internal transmission wheel (4) is a crank gear (35), which is one of the components of the timing transmission gear train.
The external transmission wheel (7) is a pulley (36), and transmits power to the engine cooling fan and the cooling water pump via the transmission belt. The pulley (36) is secured to the rotation transmission shaft (2) by a key (37) and a key groove (38).
The rear end face of the internal transmission wheel (4) is brought into contact with the seat (39) of the rotary transmission shaft (2), and the collar (8) is arranged on the front side of the internal transmission wheel (4). The external transmission wheel (7) is arranged on the front side of the rotary transmission shaft, and the external transmission wheel (7) is pressured backward by the fastening force of the fastener (40) attached to the rotational transmission shaft (2), so that the rotational transmission shaft (2) A collar (8), an internal transmission wheel (4) and the like are sandwiched between the seat (39) and the external transmission wheel (7). The fastener (40) is a fastening nut.

The collar (8) is made of a cylindrical steel material.
The nitriding layer is formed on the outer peripheral surface of the cylindrical steel material and also on the inner peripheral surface.
In order to form a nitriding layer on the surface of a cylindrical steel material, the following is performed.
By exposing a cylindrical steel containing nitride-forming elements such as aluminum, chromium and molybdenum to an atmosphere containing ammonia or nitrogen and heating it in the temperature range below the austenitizing temperature, the surface of the cylindrical steel is near ( 1 mm or less) is infiltrated with nitrogen and cured. The surface hardness of the color (8) is 900 HV or more in terms of Vickers hardness.
The sulfuration treatment layer is a sulfide layer of several microns formed on the nitride compound layer by gas oxynitridation or the like.

  As shown in FIGS. 1 (A) and 1 (B), the axial length direction of the rotational transmission shaft (2) is the front-rear direction, and the collar (8) is a front-rear symmetrical shape. That is, the shape of the collar (8) due to the chamfering of the end portion or the radius is made symmetrical in the front-rear direction. For this reason, even if the collar (8) is fitted to the rotary transmission shaft (2) from either end, the collar (8) is not assembled incorrectly, and oil leakage from the collar (8) due to this is prevented. be able to. Moreover, the work of fitting the collar (8) is simplified.

As shown in FIGS. 1 (A) to 1 (D), the internal transmission wheel (4) is prevented from rotating around the rotary transmission shaft (2) by the key (10) and the key groove (11), and the external transmission wheel (7) The collar (8) is sandwiched between the internal transmission wheel (4) and the following is performed.
A gasket (12) is sandwiched between the collar (8) and the internal transmission wheel (4), and this gasket (12) is positioned in a radial direction from the key groove opening (14) of the end surface (13) of the internal transmission wheel (4). The outer side is sandwiched between the end face (13) of the internal transmission wheel (4) and the end face (15) of the collar (8).
For this reason, the portion radially outside the key groove opening (14) having a small sealing area can be strongly sealed by the gasket (12), and the engine oil in the transmission case (1) is rotated by the rotation transmission shaft ( It is difficult to enter the gap between 2) and the collar (8), and oil leakage from the collar (8) can be prevented.

As shown in FIGS. 1 (A) and 1 (B), with the axial direction of the rotary transmission shaft (2) in the front-rear direction and the protruding direction of the rotary transmission shaft (2) as the front, the external transmission wheel (7) and the collar (8 An annular dust cover (25) is sandwiched between the oil seal (9) and the oil seal (9) from the front side.
For this reason, it is difficult for dust outside the transmission case (1) to approach the oil seal (9), and wear of the oil seal (9) due to the biting of dust can be suppressed.

As shown in FIG. 1 (B), the boss (26) of the transmission shaft insertion hole (5) protrudes from the case wall (3) of the transmission case (1) to the front side, and oil is formed on the inner periphery of the boss (26) The seal (9) is fitted and the outer peripheral edge (27) of the dust cover (25) is led out rearward along the outer peripheral surface (28) of the boss (26).
For this reason, it is difficult for dust outside the transmission case (1) to enter between the dust cover (25) and the boss (26), and wear of the oil seal (9) due to dust can be suppressed.

As shown in FIGS. 1 (B), (E), and (F), a protrusion (30) is provided on the rear surface (29) of the dustproof cover (25), and the oil seal (9) is rotated by rotating the dustproof cover (25). The wind by the protrusion (30) occurs in the front. Instead of the protrusion (30), a recess is provided on the rear surface (29) of the dust cover (25), and rotation of the dust cover (25) may cause wind by the recess in front of the oil seal (9). Good.
For this reason, entry of dust into the oil seal (9) is hindered by the wind, and wear of the oil seal (9) due to the biting of dust can be suppressed.
In addition, there is an effect that the oil seal (9) is cooled by the flow of air near the oil seal (9) by wind.
The protrusion (30) is a protrusion extending in the radial direction of the dust cover (25). The concave portion is also formed as a concave strip extending in the radial direction of the dust cover (25).

The second embodiment shown in FIG. 2 uses an O-ring (17) instead of the gasket (12) of the first embodiment, and differs from the first embodiment in the following points.
As illustrated in FIGS. 2 (A) to 2 (D), the internal transmission wheel (4) is prevented from rotating around the rotary transmission shaft (2) by the key (10) and the key groove (11), and the external transmission wheel (7). When the collar (8) is sandwiched between the inner transmission wheel (4) and the inner transmission wheel (4), an O-ring fitting portion (16) is provided along the outer periphery of the end face (15) of the collar (8). An O-ring (17) is fitted into the portion (16), and the O-ring (17) is connected to the inner transmission wheel (16) radially outside the key groove opening (14) of the end surface (13) of the inner transmission wheel (4). 4) between the end face (13) and the collar (8).

For this reason, it is possible to strongly seal the outer portion in the radial direction with respect to the key groove opening (14) having a small sealing area with the O-ring (17), and the engine oil in the transmission case (1) is rotated by the rotation transmission shaft. It is difficult to enter the gap between (2) and the collar (8), and oil leakage from the collar (8) can be prevented.
Other configurations and functions are the same as those of the first embodiment. In FIG. 2, the same elements as those of the first embodiment are denoted by the same reference numerals as those of FIG.

In the third embodiment shown in FIG. 3, the protrusion (30) is removed from the dustproof cover (27) of the first embodiment, and the rear surface (29) of the dustproof cover (27) is a flat surface without irregularities. .
Other configurations and functions are the same as those of the first embodiment. In FIG. 3, the same elements as those of the first embodiment are denoted by the same reference numerals as those of FIG.

The fourth embodiment shown in FIG. 4 is provided with a protrusion (32) instead of the dust cover (27) of the first embodiment.
That is, as shown in FIGS. 1 (A) and 1 (B), an annular dust cover (25) is sandwiched between the external transmission wheel (7) and the collar (8), and this dust cover (25) provides an oil seal. Instead of covering (9) from the front side, as shown in FIGS. 4 (A) and 4 (E), a protrusion (32) is provided on the outer peripheral surface (31) of the external transmission wheel (7). The portion (32) is positioned in front of the oil seal (9), and the wind by the protrusion (32) is generated in front of the oil seal (9) by the rotation of the external transmission wheel (7). Instead of the protrusion (32), a concave portion is provided on the outer peripheral surface (31) of the external transmission wheel (7), this concave portion is positioned in front of the oil seal (9), and by rotation of the external transmission wheel (7), You may make it the wind by a recessed part arise in front of an oil seal (9).
For this reason, entry of dust into the oil seal (9) is hindered by the wind, and wear of the oil seal (9) due to the biting of dust can be suppressed.
In addition, there is an effect that the oil seal (9) is cooled by the flow of air near the oil seal (9) by wind.
The protrusion (30) is a protrusion extending in the front-rear direction along the outer peripheral surface (31) of the external transmission wheel (7). The concave portion is also formed as a concave strip extending in the front-rear direction along the outer peripheral surface (31) of the external transmission wheel (7).

(1) Transmission case
(2) Rotating transmission shaft
(3) Case wall
(4) Internal transmission wheel
(5) Transmission shaft insertion hole
(6) Protruding part
(7) External transmission wheel
(8) Color
(8a) Outer surface
(8b) Inner peripheral surface
(9) Oil seal
(10) key
(11) Keyway
(12) Gasket
(13) End face of internal transmission wheel
(14) Keyway opening
(15) Color end face
(16) O-ring fitting part
(17) O-ring
(25) Dust cover
(26) Boss of transmission shaft insertion hole
(27) Outer peripheral edge of dust cover
(28) Outer surface of boss
(29) Rear surface of dust cover
(30) Dust cover protrusion
(31) Outer peripheral surface of external transmission wheel
(32) Projection of external transmission wheel

Claims (9)

Insert the rotation transmission shaft (2) into the transmission case (1), fit the inner transmission wheel (4) to the outer periphery of the rotation transmission shaft (2) in the transmission case (1), and the case wall of the transmission case (1). The transmission shaft insertion hole (5) is opened in (3), and the transmission shaft (2) is projected outside the transmission case (1) through the transmission shaft insertion hole (5), and the rotation transmission is performed outside the transmission case (1). The outer transmission wheel (7) is fitted on the outer periphery of the projection (6) of the shaft (2), the collar (8) is fitted on the outer periphery of the rotary transmission shaft (2) in the transmission shaft insertion hole (5), and the transmission shaft is inserted. In the sealing device for the transmission case of the engine, the oil seal (9) is fitted on the inner periphery of the hole (5), and the oil seal (9) is brought into contact with the outer peripheral surface (8a) of the collar (8).
With the axial direction of the rotary transmission shaft (2) as the longitudinal direction and the protruding direction of the rotary transmission shaft (2) as the front,
An annular dustproof cover (25) is sandwiched between the external transmission wheel (7) and the collar (8), and the oil seal (9) is covered from the front side with the dustproof cover (25). Sealing device for engine transmission case. The sealing device for the transmission case of the engine according to claim 1,
The boss (26) of the transmission shaft insertion hole (5) protrudes from the case wall (3) of the transmission case (1) to the front side, and an oil seal (9) is fitted into the boss (26), and the dust cover (25) The outer peripheral edge portion (27) of the engine is led out rearward along the outer peripheral surface (28) of the boss (26). In the sealing device for the transmission case of the engine according to claim 1 or 2,
A protrusion (30) or a recess is provided on the rear surface (29) of the dust cover (25), and rotation of the dust cover (25) causes wind due to the protrusion (30) or the recess in front of the oil seal (9). An engine transmission case sealing device characterized by that. The sealing device for the transmission case of the engine according to claim 1,
Instead of sandwiching an annular dustproof cover (25) between the external transmission wheel (7) and the collar (8) and covering the oil seal (9) from the front side with this dustproof cover (25),
A protrusion (32) or a recess is provided on the outer peripheral surface (31) of the external transmission wheel (7), and the protrusion (32) or the recess is positioned in front of the oil seal (9), so that the external transmission wheel (7) An engine transmission case sealing device, characterized in that, by rotation, wind is generated by a protrusion (32) or a recess in front of an oil seal (9). In the sealing device of the transmission case of the engine according to any one of claims 1 to 4,
A sealing device for an engine transmission case, wherein a nitrided layer is formed on the outer peripheral surface (8a) of the collar (8). In the engine transmission case sealing device according to claim 5,
A sealing device for a transmission case of an engine, wherein a sulfuration treatment layer is provided on the outermost surface of the nitridation treatment layer. In the sealing device for the transmission case of the engine according to any one of claims 1 to 6,
A sealing device for an engine transmission case, characterized in that the axial direction of the rotary transmission shaft (2) is the longitudinal direction and the collar (8) is a longitudinally symmetrical shape. In the sealing device for the transmission case of the engine according to any one of claims 1 to 6,
The internal transmission wheel (4) is locked to the rotary transmission shaft (2) with the key (10) and key groove (11), and the collar (8) is provided between the external transmission wheel (7) and the internal transmission wheel (4). When sandwiching
A gasket (12) is sandwiched between the collar (8) and the internal transmission wheel (4), and this gasket (12) is positioned in a radial direction from the key groove opening (14) of the end surface (13) of the internal transmission wheel (4). An engine transmission case sealing device characterized in that it is sandwiched between an end surface (13) of an internal transmission wheel (4) and an end surface (15) of a collar (8) on the outside. In the sealing device for the transmission case of the engine according to any one of claims 1 to 6,
The internal transmission wheel (4) is locked to the rotary transmission shaft (2) with the key (10) and key groove (11), and the collar (8) is provided between the external transmission wheel (7) and the internal transmission wheel (4). When sandwiching
An O-ring fitting part (16) is provided along the outer periphery of the end face (15) of the collar (8), and an O-ring (17) is fitted into the O-ring fitting part (16). ) Between the end face (13) of the internal transmission wheel (4) and the collar (8) on the radially outer side than the keyway opening (14) of the end face (13) of the internal transmission wheel (4). A sealing device for an engine transmission case.

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