JPH0596537U - Oil seal device at the rear end of the engine crankshaft - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the structure of the oil seal at the rear end of the crankshaft, regarding the oil seal device at the rear end of the crankshaft of the engine. An oil seal support member 6 is configured by an engine rear connecting member 8 including either a rear end plate or a flywheel housing, and the engine rear connecting member 8 is formed.
The oil seal 7 is attached to the inner peripheral wall 13 of the oiltight support port 12. As a result, the structure of the oil seal device can be simplified by omitting the conventional bearing case cover and its positioning and fixing structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil seal device for a rear end portion of an engine crankshaft, and provides an oil seal device having a simplified structure, a reduced number of assembling steps, and a low cost.

[0002]

[Prior Art]

 As shown in FIG. 1 or 9, the basic structure of the oil seal device at the rear end of the crankshaft of the engine, which is the subject of the present invention, is to support the crankshaft 4 through the bearing 3 on the crankcase 1 of the engine E. Then, the oil seal supporting member 6 is attached to the rear end wall 2 of the crankcase 1, and the oil seal supporting member 6 is attached to the peripheral surface of the rear end 5 of the crankshaft 4 protruding rearward from the rear bearing 3. No, the oil seal 7 supported by the oil seal support member 6 is brought into oil-tight contact with the peripheral surface of the rear end portion 5 of the crankshaft 4, and the rear end plate and the flywheel are attached to the rear end wall 2 of the crankcase 1. This is a type in which a rear connecting member 8 composed of either a housing or a housing is attached.

As a conventional technique of this type, as shown in FIG. 9, a rear end plate 8 as a rear connecting member and a bearing case cover 60 are separately fixed to a crankcase rear end wall 2 of a vertical diesel engine E. The bearing case cover 60 is fitted into the opening 61 of the rear end plate 8 so as to face the bearing 3 from the rear, and the case cover 60 is configured as the oil seal supporting member 6, and the bearing case cover 60 has the oil seal 7. Is installed to prevent the oil in the crank chamber 14 from leaking out of the bearing case cover 60. A cell starter or the like can be attached to the rear end plate 8 of the diesel engine E, and a flywheel 15 is connected to the rear end portion 5 of the crankshaft 4.

[0004]

Since the rear end plate 8 and the bearing case cover 60 are separately fixed to the crankcase rear end wall 2 and the case cover 60 is configured as the oil seal supporting member 6, the structure is improved. Becomes complicated, the number of assembly steps increases, and the manufacturing cost rises. Further, in order to maintain high oil tightness with respect to the crankshaft 4, the bearing case cover 60 on which the oil seal 7 is mounted is accurately positioned on the crankcase 1 by a positioning and fixing structure such as a knock pin. Therefore, the structure of the oil seal device becomes more complicated due to the positioning and fixing structure in addition to the bearing case cover 60, and the manufacturing cost also increases. The present invention aims to simplify the structure of the oil seal at the rear end of the crankshaft.

[0005]

[Means for Solving the Problems]

 Means for achieving the above object will be described below with reference to the drawings illustrating an embodiment. That is, according to the present invention, in the oil seal device for the rear end portion of the crankshaft of the basic structure engine, the oil seal supporting member 6 is constituted by the inner peripheral wall portion 10 of the engine rear connecting member 8, and the engine rear connecting member 8 is provided. The oiltight support port 12 is opened in the inner peripheral wall portion 10 of the engine, the inner peripheral wall 13 of the oiltight support port 12 is exposed to the peripheral surface of the rear end portion 5 of the crankshaft 4, and the oil seal 7 is attached to the inner peripheral wall 13. It is characterized by wearing. Since the engine rear connecting member 8 is composed of either a rear end plate or a flywheel housing, the oil seal 7 is attached to either of them. The bearing support structure for the crankshaft 4 is a hanger type in which the crankshaft 4 is supported by the crankcase 1 from below with a bearing cap, or the crankshaft is inserted into a tunnel-shaped through hole formed in the crankcase 1. It does not matter whether it is a tunnel type or not.

[0006]

[Action]

 In the prior art, the oil seal 7 was attached to the bearing case cover 60, whereas in the present invention, the inner peripheral wall portion 10 of the engine rear connecting member 8 is used as the oil seal supporting member 6, and the oil seal 7 is attached to this. Then, the peripheral surface of the rear end portion 5 of the crankshaft 4 is contacted in an oiltight manner. Therefore, in the present invention, it is not necessary to dispose the bearing case cover 60 on the crankcase rear end wall 2 separately from the rear end plate. Further, since the engine rear connecting member 8 such as the rear end plate is normally positioned with respect to the crankcase 1 by a knock pin or the like, simply installing the oil seal 7 on the engine rear connecting member 8 prevents the oil tightness with respect to the crankshaft 4. The accuracy can be kept high. For this reason, in the prior art, a dedicated positioning and fixing structure for the bearing case cover 60, which is a member for mounting the oil seal 7, is required, but the rear engine connecting member 8 is not required to have such a structure.

[0007]

[Effect of the device]

 Since the oil seal supporting member is constituted by the inner peripheral wall portion of the engine rear connecting member, the conventional bearing case cover and its positioning and fixing structure can be omitted. Further, by omitting these, the structure of the oil seal device is simplified, the number of assembling steps is reduced, and the cost can be reduced.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a right side view in vertical section of the rear end wall of the crankcase of the vertical diesel engine showing the first embodiment, and FIG. 2 is an enlarged vertical right side view of the main part of the oil seal device at the rear end of the crankshaft of the engine. It is a side view. A crankshaft 4 is supported on a crankcase 1 of the diesel engine E via a plain bearing 3, an iron-made rear end plate 8 is attached to a rear end wall 2 of the crankcase 1, and an oil is attached to an inner peripheral wall portion 10 of the rear end plate 8. The airtight support port 12 is opened, the inner peripheral wall 13 of the oiltight support port 12 is made to face the rear end portion 5 of the crankshaft 4, and an annular oil seal 7 is attached to the inner peripheral wall 13 so that the oil seal 7 is brought into oil-tight contact with the peripheral surface of the rear end portion 5 of the crankshaft 4.

That is, as shown in FIG. 2, the front portion of the oil seal 7 is extended to the outer peripheral side to form a flange portion 18, and the flange portion 18 of the oil seal 7 is connected to the rear end plate 8 and the rear end of the crankcase. The packing 19 is squeezed against the wall 2 and the packing 19 that projects to the inner peripheral side of the oil seal 7 is brought into contact with the large-diameter rear end portion 5 of the crankshaft 4, and the flywheel 15 is attached to the rear portion of the rear end portion 5. Install. The oiltight support port 12 of the rear end plate 8 is bent into an L shape by burring to form the ear 16 on the oiltight support port 12 rearward, and the rear part of the oil seal 7 is placed on the outer peripheral side. The protrusions 17 are formed by projecting, and the ears 16 of the rear end plate 8 are engaged with the protrusions 17 of the oil seal 7 to give the oil seal 7 a function of preventing the oil seal 7 from slipping forward.

As a result, the peripheral surface of the rear end portion 5 of the crankshaft 4 is oil-tightly sealed to the rear end wall 2 of the crankcase and the rear end plate 8 via the oil seal 7, so that the oil in the crank chamber 14 is prevented. Can be prevented from leaking outside through the rear end 4 of the crankshaft 4. Further, by configuring the inner peripheral wall portion 10 of the rear end plate 8 as the oil seal supporting member 6, the bearing case cover 60 shown in the prior art described above can be omitted and the structure of the oil seal device can be simplified. When the flywheel 15 of the diesel engine E is covered with the flywheel housing, the flywheel housing may be replaced by the oil seal support member 6 instead of the rear end plate 8.

FIG. 3 shows a second embodiment of the present invention in which a smooth oil-tight support port 12 is opened in the rear end plate 8 and an inner peripheral wall 13 of the support port 12 is formed to have the same diameter in the front and rear. Thus, the shape is simplified by omitting the ear portion as in the first embodiment. FIG. 4 shows Embodiment 3 of the present invention, in which the inner peripheral wall 13 of the oiltight support opening 12 of the rear end plate 8 is formed into a tapered surface whose diameter becomes larger toward the rear side, and the inner peripheral wall 13 is pulled out toward the crankcase 1 side. It is designed to prevent disconnection.

FIG. 5 shows Embodiment 4 of the present invention, in which the inner peripheral wall 13 of the oiltight support opening 12 of the rear end plate 8 is projected in a mountain shape, and a valley-shaped recess 21 is formed on the outer wall of the oil seal 7. Then, the chevron-shaped inner peripheral wall 13 is fitted into the recess 21 of the oil seal 7, and the oil seal 7 is attached to the rear end plate 8 so as not to come off. FIG. 6 shows a fifth embodiment of the present invention. Contrary to the fourth embodiment, the inner peripheral wall 13 of the oiltight support opening 12 is recessed in a valley shape, and the outer wall of the oil seal 7 is formed in a mountain shape. The ridge portion 22 is formed, and the valley-shaped inner peripheral wall 13 is fitted to the ridge portion 22 of the oil seal 7.

FIG. 7 shows Embodiment 6 of the present invention, in which an annular projection 23 having a rectangular cross section is projected from an inner peripheral wall 13 of an oiltight support port 12 of a rear end plate 8 and an annular groove is formed in an outer wall of an oil seal 7. 24 is formed and the annular groove 23 of the oil seal 7 is fitted into the annular protrusion 23 of the inner peripheral wall 13. FIG. 8 shows Embodiment 7 of the present invention. Contrary to Embodiment 6 described above, an annular groove 25 having a triangular cross section is provided in the inner peripheral wall 13 of the oiltight support port 12 to form an oil seal 7 of the oil seal 7. A mountain-shaped annular projection 26 is formed on the outer side wall, and the annular projection 26 of the oil seal 7 is fitted in the annular groove 25 of the inner peripheral wall 13.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional right side view around a rear end wall of a crankcase of a vertical diesel engine showing a first embodiment.

FIG. 2 is an enlarged vertical sectional right side view of a main part of an oil seal device at a rear end portion of a crankshaft of the engine.

FIG. 3 is a view corresponding to FIG. 2 showing a second embodiment.

FIG. 4 is a view corresponding to FIG. 2 showing a third embodiment.

FIG. 5 is a view corresponding to FIG. 2 showing a fourth embodiment.

FIG. 6 is a view corresponding to FIG. 2 showing a fifth embodiment.

FIG. 7 is a view corresponding to FIG. 2 showing a sixth embodiment.

FIG. 8 is a view corresponding to FIG. 2 showing a seventh embodiment.

FIG. 9 is a view equivalent to FIG. 1 showing a conventional technique.

[Explanation of symbols]

 1 Crankcase 2 1 Rear end wall 3 Bearing 4 Crankshaft 5 4 Rear end 6 Oil seal supporting member 7 Oil seal 8 Engine rear connecting member 10 8 Inner peripheral wall part 12 10 Oiltight support port 13 12 Inner surface E engine

Claims (1)

[Scope of utility model registration request] 1. A crankshaft (4) is supported by a crankcase (1) of an engine (E) via a bearing (3), and an oil seal support member (2) is provided on a rear end wall (2) of the crankcase (1). 6) is attached, and the oil seal support member is attached to the peripheral surface of the rear end portion (5) of the crankshaft (4) protruding rearward from the rear bearing (3).
(6) is faced, the oil seal (7) mounted on the oil seal supporting member (6) is brought into oil-tight contact with the peripheral surface of the rear end portion (5) of the crankshaft (4), and the crankcase
(1) Rear engine connecting member consisting of rear end plate or flywheel housing on rear end wall (2)
In the oil seal device for the rear end of the engine crankshaft to which (8) is attached, the oil seal support member (6) is replaced with the engine rear connecting member.
The inner peripheral wall portion (10) of (8) is formed, and the oiltight support opening (12) is opened in the inner peripheral wall portion (10) of the engine rear connecting member (8) to connect the oiltight support opening (12). Inner wall (13) is crankshaft
(4) An oil seal device for the rear end of a crankshaft of an engine, characterized in that an oil seal (7) is attached to the inner peripheral wall (13) so as to face the peripheral surface of the rear end (5).