JP2000310189A - Oil pump device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange an oil pump and a driven gear in a narrow transmission chamber even if the diameter of a mounting hole to be provided in a bulkhead between the transmission chamber and auxiliary machine chamber adjacent to each other in a crankcase is made smaller than that of the driven gear connected to a pump shaft. SOLUTION: In a device wherein an oil pump 32 is attached to the inner wall of a transmission chamber 18, and a driven gear 48 with a diameter larger than that of the oil pump 32 to be connected to a pump shaft 46, is arranged in the transmission chamber 18, and a mounting hole 50 allowing the attaching and detaching of the pump 32 from the side of an auxiliary machine chamber 19 is provided in a bulkhead between the transmission chamber 18 and the auxiliary machine chamber 19, the pump shaft 46 is constituted so as to be able to be inserted into and pulled out from the pump housing 40 and pump rotor 41 of the oil pump 32 and the driven gear 48, on the other hand, the diameter of the mounting hole 50 is made smaller than the that of the driven gear 48 to restrain the axial movement of the pump shaft 46 by a lid body 52 for closing the mounting hole 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump device for an engine, and more particularly, to a crankcase of an engine in which a transmission chamber is formed on one side and an auxiliary equipment chamber adjacent to the outside of the transmission chamber. An oil pump is mounted on the inner wall of the transmission chamber, and a driven gear connected to a pump shaft of the oil pump and having a larger diameter than the oil pump and a drive gear fixed to a crankshaft for driving the driven gear are transmitted. A mounting hole provided in the partition between the power transmission chamber and the auxiliary equipment room to enable the oil pump to be attached / detached from the auxiliary equipment room side, and the mounting hole is closed by a lid. Regarding improvement.

[0002]

2. Description of the Related Art An oil pump device for such an engine is
For example, it is already known as disclosed in Japanese Utility Model Laid-Open No. 63-49292.

[0003]

In such an oil pump device, the installation of the oil pump and its drive system in the narrow transmission chamber is facilitated from the auxiliary machinery room side by opening the mounting hole. Can be.

However, in the conventional apparatus, as described in the above-mentioned publication, the oil pump and the driven gear are all mounted from the auxiliary machine room side, so that the mounting hole is formed to have a larger diameter than the driven gear. Forced to do that. Care must be taken to compensate for a decrease in the strength of the partition wall between the transmission chamber and the auxiliary equipment chamber due to the large diameter of the mounting hole.

[0005] The present invention has been made in view of such circumstances, and even if the mounting hole provided in the partition between the transmission chamber and the auxiliary equipment chamber has a smaller diameter than the driven gear, the oil pump and the oil pump for the narrow transmission chamber are provided. It is an object of the present invention to provide an oil pump device for the engine, wherein a driven gear can be provided.

[0006]

In order to achieve the above object, according to the present invention, a transmission chamber is formed on one side of a crankcase of an engine, and an auxiliary equipment chamber is formed outside the transmission chamber. An oil pump is mounted on the inner wall of the transmission chamber, and a driven gear having a larger diameter than the oil pump connected to a pump shaft of the oil pump and a drive gear fixed to a crankshaft for driving the driven gear are provided. A mounting hole is provided in the power transmission chamber, and a mounting hole is provided in the partition between the power transmission chamber and the auxiliary equipment room so that the oil pump can be attached and detached from the auxiliary equipment room side, and the mounting hole is closed with a lid. In an oil pump device for an engine, the pump shaft is configured to be able to be inserted into and removed from a pump housing and a pump rotor of the oil pump and the driven gear, while the mounting hole is formed by the driven gear. And a smaller diameter, and the first, characterized in that to regulate the axial movement of the pump shaft by a lid for closing the same.

According to the first feature, first, the operation of mounting the oil pump inserted into the transmission chamber is performed through the mounting hole from the auxiliary machine room side, and then the driven gear is inserted into the transmission chamber to be adjacent to the oil pump. Then, by inserting the pump shaft into the driven gear, the pump housing and the pump rotor sequentially from the auxiliary equipment room through the mounting hole, even if the mounting hole is smaller in diameter than the driven gear, the transmission shaft can be narrowed. The installation of the oil pump and the connection of the driven gear to the pump shaft can be easily performed. Therefore, the strength of the partition is secured by reducing the diameter of the mounting hole, and the weight of the partition can be reduced.

Further, since the axial movement of the pump shaft inserted through the driven gear, the pump housing and the pump rotor is regulated by the lid, a member dedicated to preventing the pump shaft from coming off is not required, and the structure can be simplified. Can be.

The present invention is characterized in that, in addition to the first feature, the lid is provided with a bearing hole for rotatably supporting the pump shaft.

According to the second feature, the bearing hole of the lid, together with the bearing hole of the pump housing, supports the pump shaft on both sides of the driven gear.
This can contribute to improvement in durability of the oil pump.

Further, in the present invention, in addition to the first or second feature, detachment of the lid from the mounting hole is prevented by an auxiliary machine fixed to the auxiliary machine room. This is the third feature.

According to the third feature, since the auxiliary device fixed to the auxiliary machine room is used for preventing the detachment from the mounting hole of the cover, a dedicated holding member for the cover is not required. In addition, the holding structure can be simplified.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIG. 1 is a rear side view of a motorcycle to which the present invention is applied, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG.
3 is a sectional view taken along the line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along the line 5-5 in FIG. 3, FIG. 6 is a sectional view taken along the line 6-6 in FIG. 8 is an enlarged view around the oil pump, and FIG.
FIG. 9 is an exploded perspective view of the crankshaft,
FIG. 10 is a perspective view of the lid.

First, in FIG. 1, a motorcycle 1 is of a scooter type, and a power unit P for driving a rear wheel Wr is mounted on a rear portion of a body frame 2 via a link 9 so as to be vertically swingable. At the same time, a rear cushion 3 is interposed between the power unit P and the body frame 2.

As shown in FIG. 2, the power unit P includes a water-cooled four-stroke engine 4 and a belt-type continuously variable transmission 5 coupled to the left side of the engine 4. A rear wheel Wr located immediately after the engine 4 is mounted on one side of the rear end.

2 to 4, an engine 4 includes a crankcase 6, a cylinder block 7 connected to a front surface of the crankcase 6 and arranged substantially horizontally, and a cylinder joined to an upper surface of the cylinder block 7. The head 8 is the engine body, and the crankshaft 10 housed and supported in the crankcase 6 is a cylinder block 7.
Is connected via a connecting rod 12 to a piston 11 which moves up and down in the cylinder bore 7a.

The cylinder head 8 is provided with a known valve mechanism 74 including a camshaft 14 driven from the crankshaft 10 via a timing transmission 13, and an intake valve 72 and an exhaust valve 73 which are opened and closed by the mechanism. (See FIG. 4).

The crankcase 6 comprises a cylinder block 7
And a rear case half 6b bolted to the front case half 6a. The left and right crankshafts of the crankshaft 10 are interposed between the case halves 6a and 6b. Journal 10j ₁ , 10
j ₂ is clamped via ball bearings 15 ₁ and 15 ₂ , respectively. Of the crank shaft 10, the journal outer shaft portion 10e extending outwardly from the left crank journal 10j ₁ driven pulley 16 of the continuously variable transmission 5 is mounted, the transmission case 17 is a crank case 6
Bolted to the left end face of

At the right end of the crankcase 6 on the side opposite to the continuously variable transmission 5, a transmission chamber 18 in which the timing transmission device 13 is disposed, and a cylindrical auxiliary equipment chamber 1 adjacent to the outside thereof.
An oil seal 21 that is in close contact with the outer peripheral surface of the crankshaft 10 is mounted on a partition wall 20 between the transmission chamber 18 and the auxiliary equipment chamber 19.

As shown in FIGS. 3 and 5, in the accessory room 19, a plurality of bosses 19a protruding from the inner wall of the accessory room 19 are provided with a stator 22s of a generator 22 (auxiliary machine).
3 (see FIG. 5), and the rotor 22r is fixed to the right end of the crankshaft 10 with bolts 24.

An accessory room cover 25 and a fan cover 26 are sequentially joined to the right end of the crankcase 6, and a radiator 28 for cooling the engine is attached to the outer end of the fan cover 26. Machine 22
A cooling fan 27 for cooling the fan is provided in the fan cover 26. This cooling fan 27 is
Thus, the rotor 22r and the rotor 22r are fixed to the crankshaft 10.

As shown in FIGS. 3 and 4, the lower part of the crankcase 6 is formed in an oil reservoir 29, and the lubricating oil 30 stored therein is sucked into an oil pump 32 through an oil filter 31. The pressure is fed to the crankshaft 10 and other parts of the engine.

A lower part of the front case half 6a is formed with a cylindrical filter chamber 33 which is open at the front surface thereof.
The oil filter 31 in a cup shape and a holding spring 35 for pressing a sealing member 34 attached to the open end of the oil filter 31 against the inner wall of the chamber 33 are accommodated in the opening 3. The cap 36 is screwed.

The filter chamber 33 is divided by the oil filter 31 into an unpurified chamber corresponding to the inside of the oil filter 31 and an outer purifying chamber, and an inlet oil passage 37 connected to the oil reservoir 29 is connected to the unpurified chamber. The suction port 32i of the oil pump 32 communicates with the purification chamber via an outlet oil passage 38.

When the cap 36 is removed, the oil filter 31 can be taken out and cleaned, and the lubricating oil 30 in the oil reservoir 29 can be discharged through the filter chamber 33 to the outside. . Therefore, the cap 36 also serves as a drain bolt.

In FIG. 7, an oil pump 32 is mounted on the inner wall of the transmission chamber 18 on the side opposite to the partition wall 20. The oil pump 32 includes a pump housing 40
A pump rotor 41 housed therein, and a pump cover 42 joined to an open surface of the pump housing 40.
The pump cover 42 has the suction port 3
2i and a discharge port 32o are provided. And
The pump housing 40 and the pump cover 42 are provided with bolts 4 on the inner wall of the transmission chamber 18 with the cover 42 inside.
3 fixed. The bearing hole 4 of the pump housing 40 is provided in the oval connection hole 44 of the pump rotor 41.
The pump shaft 46 penetrating through 5 is fitted and connected so as to be removable.

The boss 4 of the driven gear 48 is mounted on the pump shaft 46.
8a are fitted and connected via a joint pin 68. That is, as shown in FIG. 8, the joint pin 68 is attached to the pump shaft 46 so as to cross the pump shaft 46. The joint pin 68 engages with the key groove 69 on the end face of the boss 48a of the driven gear 48, so that the pump The shaft 46 and the driven gear 48 are connected.

The driven gear 48 is driven by the drive gear 47 fixed to the crankshaft 10 in the transmission chamber 18 in a reduced speed, and has a much larger diameter than the oil pump 32. The drive sprocket 49 of the timing transmission 13 is formed integrally with the drive gear 47.

The partition wall 20 is provided with a circular mounting hole 50 having a diameter substantially the same as that of the oil pump 32, that is, a diameter much smaller than that of the driven gear 48, at a portion facing the oil pump 32. Through this mounting hole 50, the oil pump 32 can be attached and detached, in particular, the bolt 43 can be attached and detached.

A lid 52 is fitted into the mounting hole 50 via a seal member 53. A bag-shaped bearing hole 51 for rotatably supporting the outer end of the pump shaft 46 and restricting its axial movement is provided on the inner surface of the lid 52.
Is provided. As shown in FIG. 10, the lid 52 is integrally formed with a fan-shaped flange 54 protruding radially from the outer peripheral edge and a support 55 protruding from the outer surface. Is brought into contact with the partition wall 20 on the auxiliary equipment room 19 side, and the inner surface of the stator 22s is pressed against the tip of the support column 55 via the elastic cap 56 so that the lid 52 is positioned at the fixed position of the mounting hole 50. Will be retained.

The discharge port 32o of the oil pump 32 is
The supply oil passage 58 formed in the front case half 6a is
Rank Journal 10j₁Bearing ball bearing
Fifteen ₁Oil chamber 60 facing the outside surface of the left crank journal
Le 10j₁Oil groove 59 formed on the outer peripheral surface of the
Journal 10j₁Web 1
0w, oil reservoir 61 and crank pin 10p
And the radius provided on the crankpin 10p
Through the oil hole 63 in the direction
Communicate with the surrounding surface. The crankshaft in which the above-mentioned oil hole 63 is opened
The outer peripheral surface of the connecting rod 10p is the large end 12b of the connecting rod 12.
Is supported via a needle bearing 64 (see FIG. 4).
You.

The oil passage structure will be described in more detail.

The crankcase 6, the outer wall 65 of the continuously variable transmission 5 side, with the outer race of the ball bearing 15 ₁ which supports the left crank journal 10j ₁ are fitted closely to the journal outer shaft portion 10e The outer wall 65 and the oil seal 6 are attached.
The oil chamber 60 of the annular facing outer surface of the ball bearing 15 ₁ is defined by 6.

Left crank journal 10j₁Is that
The outer diameter of the journal extending outwardly is larger than that of the
Therefore, these left crank journals 1
0j ₁And the oil chamber between the journal outer shaft 10e.
An annular step 67 facing 60 is formed. This left crank
Journal 10j₁On the outer peripheral surface of the
Crank journal 10j₁The oil groove 5 reaching the root of
9 are provided, and these oil grooves 59 are opened to the step 67.
The mouth end is the entrance.

The oil groove 59 is formed when the crankshaft 10 is forged.
As is apparent from FIG. 9, the left crank journal ₁ is located at two places where the phase of the left crank rank journal 10j1 is shifted by about 90 ° with respect to the rotation center of the left crank rank journal 10j1.
It arranged parallel to the axis of 0j _1.

[0037] In addition, in the crank shaft 10, of the left crank journal 10j ₁ the same side crank web 1
The outer surface of 0w is formed a circular recess 70, this recess 70, is press-fitted an annular side plate 71 surrounding the left crank journal 10j _1, an annular between the the side plate 71 crank webs 10w The flat oil sump 61 is defined, the outlet of the oil groove 59 opens radially inward of the oil sump 61, and the hollow portion 62 of the crankpin 10p opens at an intermediate portion.

As shown in FIG. 6, the front case half 6a,
The cylinder block 7 and the cylinder head 8 are provided with a second oil supply passage 58 ′ branched from the oil supply passage 58, and the valve mechanism 74 is provided through the second oil supply passage 58.
Is to be refueled.

Next, the operation of this embodiment will be described.

In mounting the oil pump 32 and its drive system, first, in the front case half 6a before the rear case half 6b is connected, the oil pump 32 is inserted into the transmission chamber 18 and the auxiliary machine 19 The oil pump 32 is mounted at a predetermined position on the inner wall of the transmission chamber 18 by a bolt 43 inserted into the transmission chamber 18 through the mounting hole 50 from the bottom.

Next, a large-diameter driven gear 48 is inserted into the transmission chamber 18 of the front case half 6a so as to be adjacent to the oil pump 32. Then, the pump shaft 46 provided with the joint pin 68 is passed through the mounting hole 50 from the auxiliary machine room 19 side.
The boss 48a of the driven gear 48, the bearing hole 45 of the pump housing 40, and the connecting hole 44 of the pump rotor 41 are sequentially inserted into the boss 48a.
With the key groove 69 of the first embodiment.

Finally, a cover 52 having a seal member 53 mounted on the outer periphery thereof is fitted into the mounting hole 50 of the partition wall 20 so that the bearing hole 51 is fitted to the outer end of the pump shaft 46 and the flange 52 is provided. 54 is brought into contact with the outer surface of the partition wall 20. In this state, the elastic cap 5 is attached to the tip of the support 55 of the lid 52.
Put 6 on.

Thus, even if the diameter of the mounting hole 50 of the partition wall 20 is smaller than that of the driven gear 48, the mounting of the oil pump 32 on the inner wall of the narrow transmission chamber 18 and the connection of the driven gear 48 to the pump shaft 46. Easy to do. Therefore, depending on the mounting hole 50 having a smaller diameter than the driven gear 48,
Since the strength of the partition wall 20 hardly decreases, it is advantageous for weight reduction.

Further, the axial movement of the pump shaft 46 inserted through the driven gear 48, the pump housing 40 and the pump rotor 41 is regulated by the bag-shaped bearing hole 51 of the lid 52 fitted in the mounting hole 50. A member such as a clip dedicated to retaining the shaft 46 is not required, and the structure can be simplified.

Since the bearing hole 51 of the lid 52 and the bearing hole 45 of the pump housing 40 support the pump shaft 46 on both sides of the driven gear 48, the support is strengthened and the durability of the oil pump 32 is improved. Can be improved.

Thereafter, when the entire engine is assembled, the generator 2 fixed to the inner wall of the auxiliary machine room 19 of the crankcase 6
The second stator 22 s has its inner end face facing the support 55 of the lid 52.
Of the partition 52 through the elastic cap 56 so that the lid 52 separates the flange 54 from the partition 2.
Since the holding member is held at a fixed position in contact with the outer surface, no dedicated holding member such as a bolt is required, and the holding structure can be simplified. On the other hand, the drive gear 47 fixed to the crankshaft 10 meshes with the driven gear 48 to make the oil pump 32 drivable.

During operation of the engine 4, the crankshaft 1
The drive gear 47 rotating together with the zero drives the driven gear 48 in a reduced speed, so that the rotor 41 of the oil pump 32 is driven at an appropriate speed. Oil pump 32 operated in this manner
The lubricating oil 30 in the oil reservoir 29 is
And a supply oil passage 58, an oil chamber 60, an oil groove 59, a hollow portion 62 of a crank pin 10p, and an oil injection hole 63.
Because pumped into the ball bearing 15 ₁ which supports the left crank journal 10j ₁ in the oil chamber 60 to lubricate,
In the crank pin 10p, the outer peripheral surface, the needle bearing 64, and the inner peripheral surface of the large end 12b of the connecting rod 12 can be lubricated.

[0048] At that time, the inlet of the oil groove 59, because they open the annular step 67 between the left crank journal 10j ₁ and a small-diameter journal outer shaft portion 10e of the large diameter of the oil chamber 60 The lubricating oil can pass straight through the oil groove 59 without opposing the centrifugal force, and the crankpin 10p
Refueling can be performed smoothly.

[0049] By the way, the ball bearing 15 ₁ outside of the oil chamber 60, the oil reservoir of the crank web 10w outside 61
To pass communication between the oil grooves 59 formed on the outer peripheral surface of the left crank journal 10j ₁ can be easily processed it. Particularly, in the case of arranging the oil groove 59 parallel to the axis of the left crank journal 10j _1, since this can be simultaneously formed during the forging of the crank shaft 10, so eliminating the need for special grooving step, The productivity of the crankshaft 10 can be increased, and the cost can be reduced.

[0050] Also, oil grooves 59 of the left crank journal 10j ₁ outer circumference, since the crank pin 10p with respect to the rotational center of the left crank journals 10j ₁ are positioned at locations phase-shifted substantially 90 °, the piston 11 When reaching the top dead center and the bottom dead center, the oil groove 59 is inserted into the cylinder bore 7a.
Will be located on a plane perpendicular to the axis, thus, to avoid to join large becomes vertical load from the piston 11 in the vicinity of the oil groove 59 of the left crank journals 10j _1, left Clan journal by the oil groove 59 it is possible to prevent the reduction in strength of 10j _1.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, in order to prevent the lid 52 from coming off from the mounting hole 50, an electric motor or other auxiliary equipment can be used instead of the stator 22s of the generator 22.

[0052]

As described above, according to the first aspect of the present invention, a transmission chamber is formed on one side of a crankcase of an engine, and an auxiliary equipment chamber adjacent to the outside of the transmission chamber is formed. An oil pump is mounted on the inner wall of the transmission chamber, and a driven gear connected to a pump shaft of the oil pump and having a larger diameter than the oil pump and a drive gear fixed to a crankshaft for driving the driven gear are transmitted. A mounting hole is provided in the partition between the transmission chamber and the auxiliary equipment room to allow the oil pump to be attached and detached from the auxiliary equipment room side, and the mounting hole is closed by a lid. In the oil pump device described above, the pump shaft is configured to be able to be inserted into and removed from a pump housing and a pump rotor of the oil pump and the driven gear, while the mounting hole is formed to have a smaller diameter than the driven gear. Since the axial movement of the pump shaft is restricted by the lid that closes the oil pump, even if the mounting hole formed in the lid is smaller in diameter than the driven gear, the oil pump can be mounted in a narrow transmission chamber. In addition, the driven gear can be easily connected to the pump shaft. Therefore, by reducing the diameter of the mounting hole, the strength of the partition wall can be secured and the weight of the partition wall can be reduced. In addition, since the axial movement of the pump shaft is regulated by the lid, a member dedicated to preventing the pump shaft from coming off is not required, and the structure can be simplified.

According to a second feature of the present invention, since the cover is provided with a bearing hole for rotatably supporting the pump shaft, the bearing hole of the cover is formed in the bearing hole of the pump housing. At the same time, the pump shaft is supported on both sides of the driven gear, and the support is strengthened, which can contribute to the improvement of the durability of the oil pump.

Further, according to a third feature of the present invention,
Since the detachment of the lid from the mounting hole is prevented by the auxiliary equipment fixed to the auxiliary machine room, the detachment of the lid from the mounting hole is prevented without providing a dedicated holding member. Therefore, the structure can be further simplified.

[Brief description of the drawings]

FIG. 1 is a rear side view of a motorcycle to which the present invention is applied.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 3;

FIG. 7 is an enlarged view around the oil pump of FIG. 3;

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is an exploded perspective view of a crankshaft.

FIG. 10 is a perspective view of a lid.

[Explanation of symbols]

 4 Engine 6 Crankcase 10 Crankshaft 18 Power transmission chamber 19 Auxiliary equipment chamber 20 Partition wall 22 .... Generator 32 as an auxiliary machine ... Oil pump 40 ... Pump housing 41 ... Pump rotor 45 ... Bearing hole in pump housing 46 ... ··· Pump shaft 47 ····· Drive gear 48 ···· Driving gear 50 ····· Mounting hole 51 ···· Lithium bearing hole 52 ···· Lid

Claims (3)

[Claims] 1. A crankcase (6) for an engine (4).
A transmission chamber (18) and an auxiliary equipment room (19) adjacent to the outside of the transmission chamber (18) are formed on one side of the transmission chamber, and an oil pump (32) is mounted on the inner wall of the transmission chamber (18). A driven gear (48) connected to a pump shaft (46) of the oil pump (32) and having a larger diameter than the oil pump (32);
And a drive gear (47) fixed to the crankshaft (10) for driving the driven gear (48) are disposed in the transmission chamber (18), and the transmission chamber (18) and the auxiliary equipment chamber ( 19), the oil pump (3)
A mounting hole (50) is provided for enabling the attachment / detachment work of (2) from the auxiliary equipment room (19) side.
In the engine oil pump device closed in 2), the pump shaft (46) is connected to the oil pump (3).
2) Pump housing (40) and pump rotor (4)
1) and a structure in which the driven gear (48) can be inserted into and removed from the driven gear (48), while the mounting hole (50) is formed smaller in diameter than the driven gear (48), and a cover (52) for closing the mounting hole. An oil pump device for an engine, wherein the axial movement of the pump shaft (46) is restricted. 2. An oil pump device for an engine according to claim 1, wherein said lid (52) is provided with a bearing hole (51) for rotatably supporting said pump shaft (46). The engine oil pump device. 3. The accessory oil pump device according to claim 1, wherein the detachment of said lid (52) from said mounting hole (50) is performed by an auxiliary machine fixed to said auxiliary machine room (19). An oil pump device for an engine, wherein the oil pump device is prevented by (22).