JP2012067711A - 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 preventing oil leakage from a collar.SOLUTION: A rotary transmission shaft 2 is inserted into the transmission case 1, an inside transmission wheel 4 is fitted to the outer periphery of the rotary transmission shaft 2 in the transmission case 1, a transmission shaft inserting hole 5 is bored in a case wall 3 of the transmission case 1, and is projected to the rotary transmission shaft 2 outside the transmission case 1 via the transmission shaft inserting hole 5, an outside transmission wheel 7 is fitted to the outer periphery of a projecting part 6 of the rotary transmission shaft 2 outside the transmission case 1, the collar 8 is fitted to the outer periphery of the rotary transmission shaft 2 in the transmission shaft inserting hole 5, an oil seal 9 is fitted to the inner periphery of the transmission shaft inserting hole 5, the oil seal 9 is allowed to abut on an outer peripheral surface 8a of the collar 8, the shaft length direction of the rotary transmission shaft 2 is set in the longitudinal direction, and the collar 8 is formed in a longitudinally symmetric shape.

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 prevent oil leakage from a collar.

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 collar has a longitudinally symmetrical shape with the axial direction of the rotational transmission shaft as the longitudinal direction.

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

<Problem> There is a risk of oil leakage from the collar.
Because the collar has a longitudinally symmetrical shape with the axial direction of the rotary transmission shaft as the longitudinal direction, engine oil in the transmission case enters the collar due to misassembly of the collar in the longitudinal direction, causing oil leakage from the collar. There is a risk.

  The subject of this invention is providing the sealing device of the transmission case of an engine which can prevent the oil leak from a color | collar.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIGS. 1 to 6 (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 fitted on the outer circumference of the transmission case, a transmission shaft insertion hole (5) is made in the case wall (3) of the transmission case (1), and the transmission case (1) is externally connected via the transmission shaft insertion hole (5). The outer transmission wheel (7) is fitted on the outer periphery of the projecting portion (6) of the rotary transmission shaft (2) outside the transmission case (1), and is projected into the transmission shaft insertion hole (5). Fit the collar (8) to the outer periphery of the rotary transmission shaft (2), fit the oil seal (9) to the inner periphery of the transmission shaft insertion hole (5), and attach the oil seal (9) to the outer peripheral surface of the collar (8) ( In the sealing device for the transmission case of the engine in contact with 8a)
As shown in FIGS. 1 to 6 (A) and (B), the axial length direction of the rotary transmission shaft (2) is the front-rear direction, and the collar (8) is a front-rear symmetrical shape. Sealing device for engine transmission case.

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 1 to 6 (A) and (B), the axial length direction of the rotary transmission shaft (2) is the front-rear direction, and the collar (8) is symmetrically shaped. 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 FIGS. 1 to 6 (A) and (B), the axial length direction of the rotary transmission shaft (2) is the front-rear direction, and the collar (8) is symmetrically shaped. 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 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 1 (A) to (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), the gasket (12) is sandwiched between the collar (8) and the inner transmission wheel (4). Since it is sandwiched between the end face (13) of the internal transmission wheel (4) and the collar (8) outside the keyway opening (14) of the end face (13) of the ring (4), the sealing area The portion outside the keyway opening (14) having a small diameter can be strongly sealed with the gasket (12), and the engine oil in the transmission case (1) is transferred to the rotary transmission shaft (2) and the collar (8). ) To prevent oil leakage from the collar (8).

(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.
<Effect> Oil leakage from the collar can be prevented.
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) Since it is sandwiched between the end face (13) and the collar (8), the outer portion in the radial direction from the key groove opening (14) having a small sealing area is strongly sealed with an O-ring (17). 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.

(Invention of Claim 4)
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 3A to 3C, an O-ring fitting groove (19) along the circumferential direction is formed on the outer peripheral surface (18a) of the collar fitting portion (18) of the rotary transmission shaft (2). Since the O-ring (20) is fitted in the O-ring fitting groove (19), and the O-ring (20) is brought into pressure contact with the inner peripheral surface (8b) of the collar (8), the transmission case (1 ), Even if the engine oil enters the gap between the rotary transmission shaft (2) and the collar (8), the O-ring (20) can stop the flow out of the transmission case (1). Oil leakage from 8) can be prevented.

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 4 (A) to 4 (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 end face (13) of the inner transmission wheel (4), an O-ring fitting groove (21) is provided along the circumferential direction. The O-ring (22) is fitted into the ring fitting groove (21), and this O-ring (22) is located radially outside the key groove opening (14) of the end face (13) of the internal transmission wheel (4). Since it is sandwiched between the transmission wheel (4) and the end face (15) of the collar (8), the O-ring (22) strongly strengthens the outer portion in the radial direction from the key groove opening (14) having 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. .

(Invention of Claim 6)
The invention according to claim 6 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 5 (A) to (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 end face (15) of the collar (8), an O-ring fitting groove (23) is provided along the circumferential direction. An O-ring (24) is fitted into the mating groove (23), and the O-ring (24) 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 (24) strongly seals the portion radially outside the key groove opening (14) having 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.

(Invention of Claim 7)
The invention according to claim 7 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> Oil leakage from the collar can be prevented.
As illustrated in FIGS. 6A to 6C, an O-ring fitting groove (41) is provided on the inner peripheral surface (8b) of the collar (8) along the circumferential direction. 41) is fitted with an O-ring (42), and this O-ring (42) is brought into pressure contact with the outer peripheral surface (18a) of the collar fitting portion (18) of the rotary transmission shaft (2). ), Even if engine oil enters the gap between the rotary transmission shaft (2) and the collar (8), the O-ring (42) can stop the outflow to the outside of the transmission case (1). Oil leakage from 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 FIG. 3F 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 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). FIG. 4 (C) is an enlarged view of the portion indicated by the arrow C in FIG. 4 (A), FIG. 4 (D) is a cross-sectional view along the line DD in FIG. 4 (A), and FIG. FIG. 4F 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 5th Embodiment of this invention, FIG. 5 (A) is a vertical side view, FIG.5 (B) is an enlarged view of the B arrow part of FIG. 5 (A). FIG. 5 (C) is an enlarged view of the portion indicated by the arrow C in FIG. 5 (A), FIG. 5 (D) is a sectional view taken along the line DD in FIG. 5 (A), and FIG. FIG. 5F 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 6th Embodiment of this invention, FIG. 6 (A) is a vertical side view, FIG.6 (B) is an enlarged view of the B arrow part of FIG. 6 (A). Fig. 6 (C) is an enlarged view of the portion indicated by the arrow C in Fig. 6 (A), Fig. 6 (D) is a sectional view taken along the line DD of Fig. 6 (A), and Fig. 6 (E) is a dustproof cover FIG. 6F is a rear view, and is a cross-sectional view taken along line FF in FIG.

  FIGS. 1-6 is a figure explaining the sealing device of the transmission case of the engine which concerns on 1st-6th 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.

The third embodiment shown in FIG. 3 uses an O-ring (20) instead of the gasket (12) of the first embodiment, and differs from the first embodiment in the following points.
As shown in FIGS. 3A to 3C, an O-ring fitting groove (19) is provided along the circumferential direction on the outer peripheral surface (18a) of the collar fitting portion (18) of the rotary transmission shaft (2). An O-ring (20) is fitted into the O-ring fitting groove (19), and the O-ring (20) is pressed against the inner peripheral surface (8b) of the collar (8).

For this reason, even if the engine oil in the transmission case (1) enters the gap between the rotary transmission shaft (2) and the collar (8), the O-ring (20) flows out of the transmission case (1). It can be stopped 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. 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 uses an O-ring (22) instead of the gasket (12) of the first embodiment, and differs from the first embodiment in the following points.
As shown in FIGS. 4 (A) to (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 end face (13) of the inner transmission wheel (4), an O-ring fitting groove (21) is provided along the circumferential direction. The O-ring (22) is fitted into the fitting groove (21), and this O-ring (22) is internally transmitted outside the key groove opening (14) of the end face (13) of the internal transmission wheel (4) in the radial direction. It is sandwiched between the ring (4) and the end face (15) of 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 by the O-ring (22), 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. 4, the same elements as those of the first embodiment are denoted by the same reference numerals as those of FIG.

The fifth embodiment shown in FIG. 5 uses an O-ring (24) instead of the gasket (12) of the first embodiment, and differs from the first embodiment in the following points.
As shown in FIGS. 5 (A) to 5 (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 end face (15) of the collar (8), an O-ring fitting groove (23) is provided along the circumferential direction. An O-ring (24) is fitted into the groove (23), and the O-ring (24) is disposed radially outside the key groove opening (14) of the end surface (13) of the internal transmission wheel (4) ( 4) between the end face (13) and the collar (8).

For this reason, a portion radially outside the key groove opening (14) having a small sealing area can be sealed by the O-ring (24), and the engine oil in the transmission case (1) is transferred to the rotary transmission shaft (2 ) And the collar (8) are difficult to enter, and oil leakage from the collar (8) can be prevented.
Other configurations and functions are the same as those in the first embodiment. In FIG. 5, the same elements as those in the first embodiment are denoted by the same reference numerals as those in FIG.

The sixth embodiment shown in FIG. 6 uses an O-ring (42) instead of the gasket (12) of the first embodiment, and differs from the first embodiment in the following points.
As shown in FIGS. 6A to 6C, an O-ring fitting groove (41) is provided on the inner peripheral surface (8b) of the collar (8) along the circumferential direction, and this O-ring fitting groove (41). The O-ring (42) is fitted to the outer peripheral surface (18a) of the collar fitting portion (18) of the rotary transmission shaft (2).

For this reason, even if the engine oil in the transmission case (1) enters the gap between the rotary transmission shaft (2) and the collar (8), the O-ring (42) flows out of the transmission case (1). It can be stopped 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. 6, the same elements as those of the first embodiment are denoted by the same reference numerals as those of FIG.

(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
(18) Collar fitting part of rotation transmission shaft
(18a) Outer surface
(19) O-ring fitting groove
(20) O-ring
(21) O-ring fitting groove
(22) O-ring
(23) O-ring fitting groove
(24) O-ring
(41) O-ring fitting groove
(42) O-ring

Claims (7)

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).
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. The sealing device for the transmission case of the engine according to claim 1,
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. The sealing device for the transmission case of the engine according to claim 1,
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. The sealing device for the transmission case of the engine according to claim 1,
An O-ring fitting groove (19) along the circumferential direction is provided on the outer peripheral surface (18a) of the collar fitting portion (18) of the rotary transmission shaft (2), and an O-ring (20 ) And the O-ring (20) is brought into pressure contact with the inner peripheral surface (8b) of the collar (8). The sealing device for the transmission case of the engine according to claim 1,
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 groove (21) is provided in the end surface (13) of the internal transmission wheel (4) along the circumferential direction, and the O-ring (22) is fitted into the O-ring fitting groove (21). The ring (22) is sandwiched between the internal transmission wheel (4) and the end surface (15) of the collar (8) outside the keyway opening (14) of the end surface (13) of the internal transmission wheel (4) in the radial direction. A sealing device for an engine transmission case. The sealing device for the transmission case of the engine according to claim 1,
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 groove (23) is provided on the end face (15) of the collar (8) along the circumferential direction, and the O-ring (24) is fitted into the O-ring fitting groove (23). 24) is sandwiched between the end face (13) of the internal transmission wheel (4) and the collar (8) outside the keyway opening (14) of the end face (13) of the internal transmission wheel (4). A sealing device for an engine transmission case. The sealing device for the transmission case of the engine according to claim 1,
An O-ring fitting groove (41) along the circumferential direction is provided on the inner peripheral surface (8b) of the collar (8), and the O-ring (42) is fitted into the O-ring fitting groove (41). An engine transmission case sealing device characterized in that (42) is brought into pressure contact with the outer peripheral surface (18a) of the collar fitting portion (18) of the rotary transmission shaft (2).

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