JP5793481B2 - engine - Google Patents

Description

  The present invention relates to an engine, and more particularly to an engine that can enhance the durability of an oil seal.

Conventionally, a timing transmission case attached to a crankcase, a crankshaft through hole provided in an end wall of the timing transmission case, a crankshaft penetrating the crankshaft throughhole, and an inner peripheral surface of the crankshaft throughhole And an oil seal provided between the outer peripheral surface of the crankshaft (see, for example, Patent Document 1).
According to this type of engine, there is an advantage that oil leakage from the crankshaft through hole can be prevented by the oil seal.
However, this conventional technique has a problem because there is no means for suppressing the approach of oil to the oil seal.

Japanese Patent Laying-Open No. 2008-32228 (see FIG. 2)

<Problem> The durability of the oil seal tends to decrease.
Since there is no means for suppressing the approach of oil to the oil seal, a large amount of oil scattered in the timing transmission case comes into contact with the oil seal, and the durability of the oil seal is likely to deteriorate.

  The subject of this invention is providing the engine which can improve durability of an oil seal.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, a timing transmission case (2) attached to the crankcase (1), and a crankshaft through hole (4) provided in an end wall (3) of the timing transmission case (2). And an oil seal (6) provided between the crankshaft (5) penetrating the crankshaft through hole (4) and the inner peripheral surface of the crankshaft through hole (4) and the outer peripheral surface of the crankshaft (5). )
As shown in FIG. 1, a crank angle detection rotor (7) attached to the crankshaft (5) is provided, and the outer diameter of the crank angle detection rotor (7) is larger than the outer diameter of the oil seal (6). An engine characterized in that the crank angle detection rotor (7) is formed and faces the oil seal (4) on the inner space (2a) side of the timing transmission case (2). Opposite,
As illustrated in FIGS. 1 and 2, the end wall (3) of the timing transmission case (2) includes a rotor housing case (13), and a crank angle is detected in the internal space (13a) of the rotor housing case (13). The rotor (7) is housed,
An engine characterized in that an outer peripheral portion (7a) of a crank angle detection rotor (7) is close to a peripheral wall (13b) of a rotor housing case (13).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> The durability of the oil seal can be enhanced.
As shown in FIG. 1, a crank angle detection rotor (7) attached to the crankshaft (5) is provided, and the outer diameter of the crank angle detection rotor (7) is larger than the outer diameter of the oil seal (6). Since the crank angle detection rotor (7) is formed and faces the oil seal (4) on the inner space (2a) side of the timing transmission case (2), the inner space of the timing transmission case I (2) ( The oil scattered in 2a) is blocked by the crank angle detection rotor (7). The oil adhering to the crank angle detection rotor (7) is splashed around by the centrifugal force generated by the rotation of the crank angle detection rotor (7). For this reason, the contact of oil with the oil seal (6) is suppressed, and the durability of the oil seal (6) can be enhanced.
<Effect> The function to improve the durability of the oil seal is high.
As illustrated in FIGS. 1 and 2, the outer peripheral portion (7a) of the crank angle detection rotor (7) is close to the peripheral wall (13b) of the rotor housing case (13), so that the timing transmission case (2) If the oil scattered in the internal space (2a) does not pass through the gap between the outer peripheral portion (7a) of the crank angle detection rotor (7) and the peripheral wall (13b) of the rotor housing case (13), an oil seal ( 6) Cannot approach. For this reason, the oil contact with the oil seal (6) is suppressed, and the function of enhancing the durability of the oil seal (6) is high.

(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> The function to improve the durability of the oil seal is high.
As illustrated in FIG. 1, the oil pump (9) is driven by a crankshaft (5) via a transmission (12) having oil pump driving wheels (8) and oil pump input wheels (11) as constituent elements. Therefore, the crankshaft (5) does not penetrate the oil pump (9). For this reason, there is no possibility that the oil leaked from the oil pump (9) will approach the oil seal (6) along the crankshaft (5), the oil contact with the oil seal (6) is suppressed, and the oil seal ( 6) High durability function.

(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 2.
<Effect> The function to improve the durability of the oil seal is high.
As illustrated in FIG. 1, a crank angle detection rotor (7) is disposed on the rear side of the oil seal (6), and the oil pump drive wheel (8) is disposed on the rear side of the crank angle detection rotor (7). Since it is adjacent to the detection rotor (7), the oil scattered in the timing transmission case (2) adheres to the oil pump drive wheel (11) just before it approaches the crank angle detection rotor (7). The pump drive wheel (11) is spun off by the centrifugal force generated by the rotation of the pump drive wheel (11). For this reason, the oil contact with the oil seal (6) is suppressed, and the function of enhancing the durability of the oil seal (6) is high.

(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> The function to improve the durability of the oil seal is high.
As illustrated in FIGS. 1 and 2, the lower part of the inner space (13 a) of the rotor housing case (13) is an oil flow port (13 c) without a peripheral wall and the inner space (2 a) of the timing transmission case (2). Because of the communication, the oil adhering to the inner peripheral surface of the peripheral wall (13b) of the rotor housing case (13) flows down from the oil flow port (13c) to the internal space (2a) of the timing transmission case (2), Cannot approach the oil seal (6). For this reason, the oil contact with the oil seal (6) is suppressed, and the function of enhancing the durability of the oil seal (6) is high.

It is a vertical side view of the engine timing transmission case and its peripheral part according to an embodiment of the present invention. It is the II-II sectional view taken on the line of FIG.

  FIG. 1 and FIG. 2 are diagrams illustrating an engine according to an embodiment of the present invention. In this embodiment, a vertical multi-cylinder spark ignition engine will be described.

  As shown in FIG. 1, a timing transmission case (2) attached to the crankcase (1), a crankshaft through hole (4) provided in an end wall (3) of the timing transmission case (2), , An oil seal (6) provided between the crankshaft (5) penetrating the crankshaft through hole (4) and the inner peripheral surface of the crankshaft through hole (4) and the outer peripheral surface of the crankshaft (5) And.

As shown in FIG. 1, a crank angle detection rotor (7) attached to a crankshaft (5) is provided, and the crank angle detection rotor (7) has an outer diameter larger than that of the oil seal (6). The crank angle detection rotor (7) faces the oil seal (4) on the inner space (2a) side of the timing transmission case (2).
A gear train (20) comprising a crank gear (18), an idle gear (19), a valve gear cam (not shown) and the like attached to the crank gear (5) is accommodated in the timing transmission case (2). Yes.

As shown in FIG. 1, a seat (24) is provided on the crankshaft (5), a crank gear (18) is contacted to the seat, and an oil pump drive wheel (on the front side of the crank gear (18)). 8) are adjacent to each other and are fixed to the crankshaft (5) with a key (25).
The crank angle detection rotor (7) is adjacent to the front side of the oil pump drive wheel (8), the annular plate (26) is adjacent to the front side of the crank angle detection rotor (7), and the front side of the annular plate (26). The sleeve (21) is adjacent, and the crank pulley (22) is adjacent to the front side of the sleeve (21). The crank pulley (22) is fixed to the crankshaft (5) with a key (28).

As shown in FIG. 1, a crank gear (18), an oil pump drive wheel (8), a crank angle detection rotor (7), an annular plate (26), a sleeve (21), and a crank pulley (22) The nut (23) screwed to the shaft (5) is fixed between the seat (24) and the nut (23) by the fastening force.
The oil seal (6) has an annular shape and is fitted and fixed in the crankshaft through hole (4) of the end wall (3) of the timing transmission case (2). The seal lip on the inner periphery of the oil seal (6) is in contact with the outer peripheral surface of the sleeve (21). The annular plate (26) receives an O-ring (27) fitted in the rear inner peripheral surface of the sleeve (21) from the rear side.

As shown in FIG. 1, the oil pump drive wheel (8) attached to the crankshaft (5) in the internal space (2a) of the timing transmission case (2) and the internal space of the timing transmission case (2) ( 2a), an oil pump (9), an oil pump input shaft (10), and an oil pump input wheel (11) attached to the oil pump input shaft (10).
The oil pump (9) is driven by the crankshaft (5) through a transmission (12) having oil pump drive wheels (8) and oil pump input wheels (11) as constituent elements.
As shown in FIG. 1, a crank angle detection rotor (7) is disposed on the rear side of the oil seal (6), and on the rear side of the crank angle detection rotor (7), the oil pump drive wheel (8) detects the crank angle. Adjacent to the rotor (7).

  As shown in FIG. 1, the oil pump (9) is a trochoid pump, and an inner rotor (16) and an outer rotor (17) are accommodated in a pump case (15), and the inner rotor (16) is an oil pump input shaft. It is fixed to (8). The oil pump drive wheel (8) and the oil pump input wheel (11) are gears engaged with each other.

As shown in FIGS. 1 and 2, the end wall (3) of the timing transmission case (2) includes a rotor housing case (13), and a crank angle detection rotor is provided in the internal space (13a) of the rotor housing case (13). (7) is housed.
The outer peripheral portion (7a) of the crank angle detection rotor (7) is approaching the peripheral wall (13b) of the rotor housing case (13).
As shown in FIGS. 1 and 2, the lower part of the inner space (13a) of the rotor housing case (13) communicates with the inner space (2a) of the timing transmission case (2) through an oil flow outlet (13c) having no peripheral wall. Has been.

  As shown in FIG. 2, a crank angle detection means (14) is attached to the peripheral wall (13b) of the rotor housing case (13). This crank angle detecting means (14) also serves as an engine speed detecting means. The crank angle detecting means (14) is a pickup coil facing the outer peripheral portion (7a) of the crank angle detecting rotor (7), and a plurality of teeth provided at a constant interval on the outer peripheral portion (7a) of the crank angle detecting rotor (7). The number that (7b) passes is detected, and the crank angle and the engine speed are detected. The crank angle and engine speed detected by the crank angle detection means (14) are used for controlling the ignition timing.

(1) Crank case
(2) Timing transmission case
(2a) Internal space
(3) End wall
(4) Crankshaft through hole
(5) Crankshaft
(6) Oil seal
(7) Crank angle detection rotor
(7a) Outer periphery
(8) Oil pump drive wheel
(9) Oil pump
(10) Oil pump input shaft
(11) Oil pump input wheel
(12) Transmission device
(13) Rotor housing case
(13a) Internal space
(13b) Perimeter wall
(13c) Oil outlet

Claims (4)

The timing transmission case (2) attached to the crankcase (1), the crankshaft through hole (4) provided in the end wall (3) of the timing transmission case (2), and the crankshaft through hole (4 ), And an oil seal (6) provided between the inner peripheral surface of the crankshaft through hole (4) and the outer peripheral surface of the crankshaft (5).
A crank angle detection rotor (7) attached to the crankshaft (5) is provided. The crank angle detection rotor (7) has an outer diameter larger than the outer diameter of the oil seal (6). 7) faces the oil seal (4) on the inner space (2a) side of the timing transmission case (2) ,
The end wall (3) of the timing transmission case (2) includes a rotor housing case (13), and the crank angle detection rotor (7) is housed in the internal space (13a) of the rotor housing case (13).
An engine characterized in that an outer peripheral portion (7a) of a crank angle detection rotor (7) is close to a peripheral wall (13b) of a rotor housing case (13). The engine according to claim 1,
Oil pump drive wheel (8) attached to the crankshaft (5) in the internal space (2a) of the timing transmission case (2) and oil disposed in the internal space (2a) of the timing transmission case (2) A pump (9), an oil pump input shaft (10), and an oil pump input wheel (11) attached to the oil pump input shaft (10);
The oil pump (9) is driven by a crankshaft (5) through a transmission (12) having oil pump driving wheels (8) and oil pump input wheels (11) as constituent elements. To engine. The engine according to claim 2,
A crank angle detection rotor (7) is disposed on the rear side of the oil seal (6), and an oil pump drive wheel (8) is adjacent to the crank angle detection rotor (7) on the rear side of the crank angle detection rotor (7). An engine characterized by that. The engine according to any one of claims 1 to 3 ,
The engine is characterized in that the lower part of the inner space (13a) of the rotor housing case (13) communicates with the inner space (2a) of the timing transmission case (2) through an oil flow outlet (13c) having no peripheral wall. .

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