JPH08338257A - Auxiliary machine driving device for engine - Google Patents

Abstract

PURPOSE: To prevent the generation of noise by backlash by providing a first auxiliary machine to which the driving force is transmitted through a crank gear and an idle gear, mounting a second auxiliary machine and a third auxiliary machine on an engine body and a gear case, respectively, and gearing each auxiliary machine gear of the second and third auxiliary machines with the idle gear. CONSTITUTION: A right balancer shaft 21 as a second auxiliary machine and a left balancer shaft 24 are arranged on the right side and left side of a crankshaft 1a extending in the cylinder train direction of an engine, respectively, a fuel injection pump(FIP) 20 as a first auxiliary machine is mounted on the right-handed upper part of a gear case 2. A vacuum pump as a third auxiliary machine and a power steering hydraulic pump 23 as a fourth auxiliary machine are mounted on the right-handed lower part of the gear case 2, respectively. A FIP gear 20b and a right balancer gear 21b are provided on the pump shaft 20 and the right balancer shaft 21, respectively, and each gear 20b, 21b is geared with a second idle gear 12 which receives the power through a clank gear 1b fitted to the crankshaft 1a and a first idle gear 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary machine drive device for transmitting a driving force of a crankshaft to various auxiliary machines such as a fuel injection pump of an engine and a balancer shaft through a gear train.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. Hei 7-26980 discloses an auxiliary machine drive device for transmitting the driving force of a crankshaft of a diesel engine to a fuel injection pump (FIP) which is an auxiliary machine through an idle gear. As disclosed in the publication, gears of a balancer shaft and a vacuum pump, which are auxiliary machines other than the fuel injection pump, are meshed with the idle gear, and the driving force can be transmitted to these auxiliary machines. Are known.

In this case, when the rotary shaft of the vacuum pump is supported by the cylinder block of the engine,
Inner teeth are provided on the idle gear, and the inner teeth are engaged with the balancer gear and the outer teeth are engaged with the vacuum pump gear.

[0004]

By the way, when the auxiliary machine is attached to the gear case, the gear case is attached to the engine body after the auxiliary machine is attached. Therefore, in consideration of the mounting accuracy of such an accessory, it is necessary to widen the backlash between the accessory gear and the gear meshing with the accessory gear.

However, since the fuel injection pump has a large torque fluctuation due to rotation, if an auxiliary gear is made to mesh with the FIP gear, noise (toothing noise) generated by a large backlash is promoted. It will be.

The present invention has been made in view of the above problems, and its main purpose is to transmit a driving force of a crankshaft to an auxiliary machine such as a fuel injection pump having a large torque fluctuation through an idle gear. In the accessory drive device described above, by pushing the idea of the above-mentioned conventional example and further devising the use of the gear case, each accessory gear can be meshed with one gear, which causes a problem of noise. Without
It is possible to widen the backlash between the gear of the auxiliary machine mounted on the gear case side and the gear on the engine main body side that meshes with the auxiliary machine gear.

[0007]

In order to achieve the above object, in the invention of claim 1, the second auxiliary gear of the second auxiliary machine mounted on the engine body side and the third auxiliary gear mounted on the gear case side. By engaging the third auxiliary gear of the machine together with one idle gear, the backlash between the third auxiliary gear and the gear (idle gear) meshing with the third auxiliary gear can be expanded. I did it.

Specifically, according to the present invention, in a gear case attached to the engine body, a crank gear rotatably integrated with a crank shaft of the engine and a crank gear rotatably supported by the engine body are provided. An idle gear to which the driving force is transmitted, and a first auxiliary gear that is provided in the first auxiliary device in which the driving load changes with the rotation and to which the driving force of the crank gear is transmitted via the idle gear. It is premised on the accessory drive system of the engine.

A second auxiliary machine mounted on the engine body and provided with a second auxiliary machine gear, and a third auxiliary machine mounted on the gear case and provided with a third auxiliary machine gear are provided. To Then, the second and third
The auxiliary gears are respectively meshed with the idle gears.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, the second and third auxiliary gears are arranged so that at least a part thereof overlaps when viewed from one side in the axial direction of the crankshaft.

According to a third aspect of the present invention, in the second aspect of the invention, when the second auxiliary gear is fastened and fixed to the end of the rotary shaft of the second auxiliary machine by a fixing bolt, the fixing is performed. Between the head of the bolt and the end surface of the second auxiliary gear, there is provided a friction gear that meshes with the idle gear meshed with the second auxiliary gear and is slidable to the end surface of the second auxiliary gear. The fixing bolt is arranged so as to be pressed to the side of the second auxiliary gear.

[0012] In the invention of claim 4, the above-mentioned claim 1 or 2
In the invention of claim 3, the gear case is attached, and the third
When the fourth auxiliary machine is provided with the fourth auxiliary machine gear that meshes with the auxiliary machine gear, the fourth auxiliary machine is arranged on the opposite side of the gear case from the third auxiliary machine.

In a fifth aspect of the present invention, a crank gear provided integrally with the crank shaft of the engine in a gear case attached to the engine body and a driving force of the crank gear provided in the first auxiliary machine are provided. It is premised on an accessory drive device for an engine including a first accessory gear that is transmitted.

A second auxiliary machine mounted on the engine body and provided with a second auxiliary machine gear and a third auxiliary machine mounted on the gear case and provided with a third auxiliary machine gear are provided. To Then, the second and third auxiliary gears are respectively meshed with one of the gears from the crank gear to the first auxiliary gear in a state where at least a part of the second and third auxiliary gears overlap each other when viewed from one side in the axial direction of the crankshaft. .

According to a sixth aspect of the present invention, in the above-mentioned fifth aspect of the invention, when the second accessory gear is fastened and fixed to the end of the rotary shaft of the second accessory with a fixing bolt. Between the head of the bolt and the end surface of the second auxiliary gear, there is provided a friction gear that meshes with the gear that meshes with the second auxiliary gear and is slidable to the end surface of the second auxiliary gear. The fixing bolt is arranged so as to be pressed to the second auxiliary gear side.

[0016]

With the above structure, in the invention of claim 1, the driving force of the crankshaft of the engine is transmitted to the first auxiliary gear via the crank gear and the idle gear, so that the first auxiliary machine drives the above-mentioned driving device. Driven by force. On the other hand, the second and third
In the accessory, since the second and third accessory gears mesh with the idle gear, the driving force is transmitted through these gears and is driven in the same manner as in the case of the first accessory.

At this time, while the drive load of the first auxiliary machine changes with the rotation, the angular velocity fluctuation of the idle gear is small. Therefore, the backlash between the third auxiliary gear attached to the gear case and the gear (idle gear) that meshes with the third auxiliary gear can be expanded, and this backlash causes
The deviation between the axes caused by the mounting accuracy of the third auxiliary machine will be absorbed.

According to the second aspect of the invention, the second and third auxiliary gears are arranged so that at least a part thereof overlaps each other when viewed from one side in the axial direction of the crankshaft, so many auxiliary gears interfere with each other. It becomes possible to mesh with the idle gear without doing so, so that it becomes possible to drive many auxiliary machines via one idle gear.

According to the third aspect of the present invention, the second auxiliary gear is meshed with the idle gear together with the friction gear, so that the backlash between the second auxiliary gear and the idle gear is large. Noise is kept low.

At this time, the friction gear is
Since the head of the fixing bolt that fastens and fastens the auxiliary gear to the rotating shaft of the second auxiliary device is pressed toward the second auxiliary gear, the conventional bolt that is interposed between the auxiliary bolt and the head of the fixing bolt is used. No pressing member is required. Therefore, the protrusion amount of the head portion of the fixing bolt can be reduced by the amount of the pressing member, so that the second and third
When the auxiliary gears are arranged so as to overlap each other when viewed from one side in the axial direction of the crankshaft, it is possible to prevent the dimension in the axial direction from becoming long.

In a fourth aspect of the present invention, the fourth auxiliary gear is meshed with the third auxiliary gear, and the driving force of the crank gear is also applied to the fourth auxiliary gear via the third auxiliary gear. Then, the third auxiliary device is driven by the driving force. At this time, since the fourth auxiliary machine is located on the side opposite to the third auxiliary machine with respect to the gear case, it is possible to prevent the third and fourth auxiliary machines from interfering with each other. Therefore, it becomes possible to drive many auxiliary machines in a space-efficient manner.

In the fifth aspect of the invention, the driving force of the crankshaft of the engine is transmitted to the first auxiliary gear via the crank gear, so that the first auxiliary machine is driven. On the other hand, in the second and third auxiliary machines, the second and third auxiliary machine gears mesh with one of the gears from the crank gear to the first auxiliary machine gear. Is transmitted and is driven in the same manner as in the case of the first auxiliary machine.

At this time, since the second and third auxiliary gears are arranged so that at least a part thereof overlaps each other when viewed from one side in the axial direction of the crankshaft, many auxiliary gears do not interfere with each other. It becomes possible to mesh with one gear, and thus many auxiliary machines can be driven through one gear.

In the invention of claim 6, the second auxiliary gear is meshed with one gear together with the friction gear, so that the backlash between the second auxiliary gear and the gear is large. The noise generated is kept low.

At this time, the friction gear is
Since the fixing bolt head that fastens and fixes the auxiliary gear to the rotating shaft of the second auxiliary machine is pressed toward the second auxiliary machine gear side,
The conventional pressing member interposed between the fixing bolt and the head is not required. Therefore, since the protrusion amount of the head portion of the fixing bolt can be reduced by the amount of the pressing member, when the second and third auxiliary gears are arranged so as to overlap with each other when viewed from one side in the axial direction of the crankshaft, the axial direction of the crankshaft can be reduced. It is possible to suppress the length of the product from becoming long.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine drive device for an engine according to an embodiment of the present invention will be described below with reference to the drawings. 2 and 3 show
FIG. 2 is a front view of the entire configuration of the accessory drive device as viewed from the vehicle front side.

Although the engine is a vertical four-cylinder diesel engine for vertical installation, although not shown, a cylinder head is provided above the cylinder block 1 as an engine body, and an oil pan is provided below the cylinder block. It is joined to block 1. A rear case 2a (see FIG. 3) arranged on the rear side and a front case 2b (see FIG. 2) arranged on the front side of the rear case 2a are joined to each other on the front end surface of the cylinder block 1. The gear case 2 thus formed is attached by a plurality of fixing bolts (not shown).

The crankshaft 1a of the engine extends in the direction of the cylinder row (the front-rear direction in FIGS. 2 and 3), and as shown in FIG. 3, the crankshaft 1a is located on the right side of the vehicle (left side in the figure). Has a right balancer shaft 21 as a second auxiliary machine, and a left balancer shaft 24 on the left side of the vehicle (right side in the figure). The balancer shafts 21 and 24 are arranged in parallel with the crankshaft 1a. In this state, the cylinder block 1 is rotatably supported around the axis.

On the upper right side of the vehicle of the gear case 2,
A fuel injection pump 20 (FIP) as a first auxiliary machine is attached. That is, the rear case 2a includes
As shown by a broken line in FIG. 3, a mounting hole 40 for inserting the fuel injection pump 20 is provided.
Has a mounting plate portion 40a at its opening edge, and bolt holes 40b, 4 at two positions on the rear side of the mounting plate portion 40a.
0b are provided respectively. Although not shown, each of the fuel injection pumps 20 has a bolt insertion hole and can be joined to the mounting plate portion 40a.
A pair of mounting pieces is provided on the insertion end side, and is fixed by two fixing bolts while being inserted into the mounting hole 40 from the rear side.

Further, as shown in FIG. 2, a through hole 50 is provided at a position facing the mounting hole 40 of the front case 2b.
Is provided, and both the tip end portion of the pump shaft 20a and the boss portion of the FIP gear described later project through the through hole 50 toward the front side, and the drive pulley 6 is rotatably connected to the projecting end thereof. Has been done. This drive pulley 6
Although not shown, is used to rotationally drive the intake / exhaust valve driving cam shaft in the cylinder head, and a timing belt is provided between the cam shaft and a driven pulley that is rotatably connected to the cam shaft. It is wrapped around.

A vacuum pump 22 as a third auxiliary machine and a hydraulic pump 23 as a fourth auxiliary machine for a power steering device are mounted on the lower right side of the vehicle of the gear case 2.

As shown in FIG. 1, the vacuum pump 22 is arranged at a position (front side position) opposite to the cylinder block 1 of the gear case 2. That is, as shown in FIG. 2, the front case 2b is provided with a mounting hole 42 into which the vacuum pump 22 is inserted, and the mounting plate portion 42a is provided at the opening edge of the mounting hole 42.
However, bolt holes 42b, 42b are respectively provided at two positions on the rear side of the mounting plate portion 42a. Although not shown, each of the vacuum pumps 22 has a bolt insertion hole and the mounting plate portion 42a.
Is provided on the side of the insertion end, and is fixed by two fixing bolts while being inserted into the mounting hole 42 from the front side.

On the other hand, as shown in FIG. 1, the hydraulic pump 23 is arranged at a position on the cylinder block 1 side of the gear case 2 (position on the rear side), and the hydraulic pump gear 23b meshes with the vacuum pump gear 22b. Are arranged as follows. That is, in the rear case 2a, as shown in FIG.
As shown in FIG. 3, a mounting hole 43 for inserting the hydraulic pump 23 is provided, and bolt holes 43a and 43a are provided at two positions on the opening edge of the mounting hole 43, and these bolt holes 4
Bolt holes 43b and 43b are provided at two locations on the front case 2b corresponding to 3a and 43a, respectively. Although not shown, each of the hydraulic pumps 23 is provided with a pair of mounting pieces, which have bolt insertion holes and can be joined to the rear surface of the rear case 2a, on the insertion end side, 2 with the mounting hole 43 inserted from the rear side
The fixing bolts are used to fix the rear case 2a and the front case 2b together.

Next, the gear train in the gear case 2 for driving each of the above-mentioned auxiliary machines by the crankshaft 1a will be described.

The crank gear 1 is attached to the crank shaft 1a.
b is connected integrally in rotation. On the other hand, a FIP gear 20b serving as a first auxiliary gear is rotatably connected to the pump shaft 20a of the fuel injection pump 20. This F
The number of teeth of the IP gear 20b is twice as large as that of the crank gear 1b, whereby the pump shaft 20a is rotationally driven at a speed half that of the crank shaft 1a.

The crank gear 1b and the FIP gear 20
A first idle gear 11 that meshes with the crank gear 1b and a second idle gear 12 that meshes with the first idle gear 11 are disposed between b and the FIP gear 2
0b is arranged at a position meshing with the second idle gear 12. The first and second idle gears 11 and 12 are
Each is rotatably supported by a shaft 15 fixed to the cylinder block 1 by a fixing bolt 14 in an externally fitted state.

Further, the shaft portion 21a of the right balancer shaft 21.
A right balancer gear 21b as a second auxiliary gear is rotatably connected to the. On the other hand, a vacuum pump gear 22b as a third auxiliary gear is rotatably connected to the pump shaft 22a of the vacuum pump 22. The right balancer gear 21b and the vacuum pump gear 22b are arranged so as to mesh with the second idle gear 12, respectively, in a state where a part of the right balancer gear 21b and the vacuum pump gear 22b overlap when viewed from one side in the axial direction of the crankshaft 1a. At that time, the right balancer gear 21b is moved to the second
The idle gear 12 and the vacuum pump gear 22b mesh with the rear side portion and the front side portion, respectively. The number of teeth of the right balancer gear 21b is 1/2 of that of the crank gear 1b.
The right balancer shaft 21a is rotationally driven at a speed twice that of the crankshaft 1a and in a direction opposite to the rotation direction of the crankshaft 1a.

Further, the rotary shaft 23 of the hydraulic pump 23
A hydraulic pump gear 23b as a fourth auxiliary gear is rotatably connected to a. The hydraulic pump gear 23b is arranged at a position meshing with the vacuum pump gear 22b.

On the other hand, on the left side of the vehicle in the gear case 2, a third idle gear 13 meshing with the crank gear 1b and a shaft portion 24a of the left balancer shaft 24 are rotatably connected to each other, and A left balancer gear 24b meshing with the idle gear 13 is arranged. The number of teeth of the left balancer gear 24b is the same as that of the right balancer gear 21b. The third idle gear 13 is rotatably supported in the state of being externally fitted to the shaft portion 15 fixed to the cylinder block 1 by the fixing bolt 14 as in the case of the first and second idle gears 11 and 12. ing. As a result, the left balancer shaft 24 is rotationally driven at a speed twice that of the crankshaft 1a and in the same direction as the rotation direction of the crankshaft 1a.

The shaft portion 15 of the second idle gear 12 is
As shown in FIG. 3, the shaft portion 21a of the right balancer shaft 21 includes a right opening portion 7 provided on the right side of the rear case 2a in the vehicle.
In addition, the shaft portion 15 of the third idle gear 13 and the shaft portion 24a of the left balancer shaft 24 face the inside of the gear case 2 at the left opening 8. Further, below the crank gear 1b, an oil pump gear 25b that is rotatably connected to an oil pump shaft 25a of an oil pump (not shown) and meshes with the crank gear 1b is arranged.

The friction gears arranged on the crank gear 1b, the FIP gear 20b, and the left and right balancer gears 21b and 25b will be described below.

On the front side of the crank gear 1b,
A friction gear 16 having one tooth less than that of the crank gear 1b is arranged. This friction gear 16 is, as shown in FIG. 4, the first idle gear 1
In the state of meshing with 1, the baffle plate 17 and the spring 18 are pressed against the end surface of the crank gear 1b.
The friction gear 16 is the third idle gear 13
It is designed not to mesh with.

On the front side of the FIP gear 20b,
The friction gear 3 having one more tooth than the FIP gear 20b is arranged. This friction gear 3
Of the FIP gear 20b via a spring 5 by a holding portion 4 which is provided around the boss portion of the FIP gear 20b so as to rotate integrally therewith.
b It is pressed against the end surface of the main body.

A friction gear 31 having one more tooth than that of each balancer gear 21b, 24b is arranged on the front side of each balancer gear 21b, 24b. This friction gear 31 is the second or third. Each balancer gear 2 while meshing with the idle gears 12 and 13
It is pressed against the end faces of 1b and 24b. More specifically, as shown in FIGS. 1 and 4, each of the balancer gears 2
1b and 24b are respectively fixed to the shaft portions 21a and 24a by fixing bolts 32 screwed to the ends of the shaft portions 21a and 24a.
It is fastened and fixed to 4a. At that time, a step portion 32a is provided around the head of the fixing bolt 32, and the step portion 3a is provided.
Each friction gear 31 is pressed by the 2a through the spring washer 33 toward the balancer gears 21b and 24b.

Therefore, in the above embodiment, the driving force of the crankshaft 1a of the engine is transmitted to the FIP gear 20b via the crank gear 1b and the first and second idle gears 11 and 12, so that the fuel injection pump 20 is driven by the driving force. On the other hand, in the right balancer shaft 21 and the vacuum pump 22, since the right balancer gear 21b and the vacuum pump gear 22b mesh with the second idle gear 12, these gears 1b, 11, 12, 21b, 2
The driving force is transmitted via 2b and is driven in the same manner as in the case of the fuel injection pump 20.

At this time, since the right balancer shaft 21 is located on the rear side of the gear case 2 and the vacuum pump 22 is located on the front side of the gear case 2, a direction orthogonal to the axial direction of the crankshaft 1a is obtained. In the above, the right balancer shaft 21 and the vacuum pump 22 are prevented from interfering with each other. Therefore, the right balancer gear 21b and the vacuum pump gear 22b can be meshed with the second idle gear 12 without using a conventional idle gear having internal teeth.

While the drive load of the fuel injection pump 20 changes with the rotation, the angular velocity fluctuation of the second idle gear 12 is small. Therefore, the backlash between the vacuum pump gear 22b and the gear (the second idle gear 12) meshing with the vacuum pump gear 22b can be expanded, and the backlash causes the gear case 2 instead of the cylinder block 1. The displacement between the axes due to the mounting accuracy of the mounted vacuum pump 22 will be absorbed.

Further, since the right balancer gear 21b and the vacuum pump gear 22b are arranged so as to overlap each other when viewed from one side in the axial direction of the crankshaft 1a, many auxiliary gears can mesh with the idle gear without interfering with each other. Therefore, many auxiliary machines have the second idle gear 1
It becomes possible to be driven via 2.

Further, the vacuum pump gear 22b is meshed with the hydraulic pump gear 23b, and the driving force of the crankshaft 1a is also transmitted to the hydraulic pump gear 23b through the vacuum pump gear 22b, and the hydraulic pump 23 is driven by the driving force. To be done. At this time, since the hydraulic pump 23 is located on the rear side, which is the opposite side of the gear case 2 from the vacuum pump 22, it is possible to prevent the hydraulic pump 23 and the vacuum pump 22 from interfering with each other. . Therefore, many auxiliary machines can be efficiently driven.

Further, since the right balancer gear 21b meshes with the second idle gear 12 together with the friction gear 31, the noise caused by the backlash between the right balancer gear 21b and the second idle gear 12 can be kept low.

At this time, the friction gear 31 is
The right balancer gear 21b is connected to the shaft portion 21a of the right balancer shaft 21.
Since the step portion 32a of the head portion of the fixing bolt 32 connected to the head portion is pressed to the right balancer gear 21b side, the conventional pressing member interposed between the head portion of the fixing bolt 32 is unnecessary. Therefore, the amount of protrusion of the head portion of the fixing bolt 32 can be reduced by the amount of the pressing member, so that the right balancer gear 21b and the vacuum pump gear 22b are connected to the crankshaft 1a.
When they are arranged so as to overlap each other when viewed from one side in the axial direction, it is possible to prevent the dimension in the axial direction from becoming long.

In the above embodiment, the fuel injection pump 20
Although the first auxiliary machine is configured by, the auxiliary machine other than the above fuel injection pump may be used as long as the drive load changes with rotation.

Further, in the above embodiment, the right balancer shaft 21
The second auxiliary machine, the vacuum pump 22 constitutes the third auxiliary machine, and the hydraulic pump 23 constitutes the fourth auxiliary machine. Which of the engine main body and the gear case is attached? Except for this, the type of auxiliary equipment is not particularly limited.

Further, in the above embodiment, the crank gear 1b
And two idle gears 11, 1 between the FIP gear 20b and
2 is arranged and the right balancer gear 21b and the vacuum pump gear 22b are meshed with the second idle gear 12, but which idle gear is meshed when the number of idle gears or a plurality of idle gears are engaged. Is not particularly limited.

Further, in the above embodiment, the crank gear 1
Although the right balancer gear 21b and the vacuum pump gear 22b are meshed with the idle gear 12 between the b and FIP gears 20b, one of the intermediate gears such as auxiliary gears other than the idle gear from the crank gear to the first auxiliary gear is connected. You may make it mesh. Even in that case, the above right balancer gear 2
1b and the vacuum pump gear 22b can be arranged so as to overlap in the axial direction of the crankshaft 1a.

[0056]

As described above, according to the first aspect of the present invention, the crankcase provided integrally with the crankshaft of the engine in the gear case attached to the engine body is rotatable with respect to the engine body. An idle gear that is supported by and that transmits the driving force of the crank gear,
An auxiliary machine drive device for an engine, comprising: a first auxiliary machine machine having a first auxiliary machine whose drive load changes with rotation, and a first auxiliary machine gear to which a driving force of a crank gear is transmitted via the idle gear. A second accessory gear of a second accessory attached to the engine body, and a third accessory gear attached to the gear case.
Since the third auxiliary gear of the auxiliary machine is made to mesh with the idle gear, the backlash between the gear of the third auxiliary machine and the gear meshing with the third auxiliary machine gear is expanded to make the third auxiliary gear. It is possible to absorb the misalignment between the axes due to the mounting accuracy of the accessory.

According to the second aspect of the present invention, since the second and third auxiliary gears are arranged so that at least a part thereof overlaps each other when viewed from one side in the axial direction of the crankshaft, many auxiliary machines are provided. The gears can be meshed with the idle gear without interfering with each other, and many accessories can be efficiently driven through one idle gear.

According to the third aspect of the present invention, when the second accessory gear is fastened and fixed to the end of the rotary shaft of the second accessory with a fixing bolt, the head of the fixing bolt is A friction gear, which meshes with an idle gear meshed with the second auxiliary gear and is slidably in contact with the end surface of the second auxiliary gear, is provided between the end surface of the second auxiliary gear and the end bolt of the second auxiliary gear. Since it is arranged so as to be pressed to the side of the two auxiliary gears, it is possible to eliminate the conventional pressing member interposed between the fixing bolt and the head of the fixing bolt. When the third auxiliary gears are arranged so as to overlap with each other when viewed from one side of the crankshaft in the axial direction, the protrusion amount of the head portion of the fixing bolt is reduced by the amount of the pressing member, and the dimension in the axial direction becomes longer. Can be suppressed.

According to the fourth aspect of the invention, when the fourth accessory is attached to the gear case, the fourth accessory is arranged on the opposite side of the gear case from the third accessory, and the fourth accessory is arranged. Since the gear is arranged so as to mesh with the third auxiliary gear,
Many auxiliaries can be driven efficiently in space.

According to the fifth aspect of the present invention, a crank gear provided integrally with the crank shaft of the engine in a gear case attached to the engine body and a crank gear provided in the first auxiliary machine and driving the crank gear. 1st force is transmitted
In an accessory drive device of an engine including an accessory gear,
At least a part of the second accessory gear of the second accessory attached to the engine body and the third accessory gear of the third accessory attached to the gear case overlap each other when viewed from one side in the axial direction of the crankshaft. In this state, one of the gears from the crank gear to the first auxiliary gear is meshed with each other, so that many auxiliary gears can be connected without interfering with each other.
Can be engaged with one gear, and many accessories can
It can be efficiently driven through two gears.

According to the invention of claim 6, when the second accessory gear is fastened and fixed to the end of the rotary shaft of the second accessory with a fixing bolt, the head of the fixing bolt is A friction gear, which meshes with a meshing gear of the second auxiliary gear and is slidably in contact with the end surface of the second auxiliary gear, is provided between the end surface of the second auxiliary gear and the second end by the fixing bolt. Since it is arranged so as to be held down to the side of the accessory gear,
The same effect as the invention of claim 3 can be obtained.

[Brief description of drawings]

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

FIG. 2 is a front view showing the overall configuration of an accessory drive device according to an embodiment of the present invention.

FIG. 3 is a front view showing the accessory drive device with the front case removed.

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

[Explanation of symbols]

 1 Cylinder Block (Engine Body) 1a Crank Shaft 1b Crank Gear 2 Gear Case 12 Second Idle Gear (Idle Gear) 20 Fuel Injection Pump (1st Auxiliary Machine) 20b FIP Gear (Auxiliary Machine Gear) 21 Right Balancer Shaft (2nd Auxiliary Machine) 21b Right balancer gear (second auxiliary gear) 22 Vacuum pump (third auxiliary gear) 22b Vacuum pump gear (third auxiliary gear) 23 Hydraulic pump (fourth auxiliary gear) 23b Hydraulic pump gear (fourth auxiliary gear) 31 Friction Gear 32 Fixing Bolt 32a Step (Head)

Claims (6)

[Claims] 1. A crankcase rotatably integrated with a crankshaft of an engine in a gear case attached to an engine body, and an idler rotatably supported by the engine body and transmitting a driving force of the crank gear. Auxiliary machine drive device for an engine, which includes a gear and a first auxiliary machine gear that is provided in a first auxiliary machine whose drive load changes with rotation and to which a driving force of a crank gear is transmitted via the idle gear. A second auxiliary machine mounted on the engine body and provided with a second auxiliary gear; and a third auxiliary machine mounted on the gear case and provided with a third auxiliary gear, An auxiliary drive device for an engine, wherein the third auxiliary gear and the third auxiliary gear are respectively meshed with the idle gear. 2. The accessory drive device for an engine according to claim 1, wherein the second and third accessory gears are arranged so that at least a part thereof overlaps when viewed from one side in the axial direction of the crankshaft. Characteristic engine drive equipment. 3. The engine accessory drive system according to claim 2, wherein the second accessory gear is fastened and fixed to the end of the rotary shaft of the second accessory with a fixing bolt, and the head of the fixing bolt and the 2 Between the end face of the auxiliary gear,
In the state where the friction gear, which meshes with the idle gear meshed with the second auxiliary gear and is slidably in contact with the end surface of the second auxiliary gear, is pressed toward the second auxiliary gear by the fixing bolt. An auxiliary machine drive device for an engine, which is provided. 4. The engine accessory drive device according to claim 1, further comprising a fourth accessory equipped with a fourth accessory gear that is attached to the gear case and that meshes with the third accessory gear. An auxiliary machine drive device for an engine, wherein the fourth auxiliary machine is arranged on a side of the gear case opposite to the third auxiliary machine. 5. A crankcase, which is provided integrally with a crankshaft of an engine, in a gear case attached to an engine body, and a first auxiliary machine, wherein a driving force of the crank gear is transmitted. An accessory drive device for an engine, comprising: an accessory gear; a second accessory that is attached to the engine body and is provided with a second accessory gear; and a third accessory gear that is attached to the gear case. A second auxiliary gear and a second auxiliary gear, wherein the second and third auxiliary gears respectively extend from the crank gear to the first auxiliary gear in a state where at least a part of the second and third auxiliary gears overlap each other when viewed from one side in the axial direction of the crankshaft. An auxiliary drive device for an engine, characterized in that the auxiliary drive device for the engine is engaged. 6. The engine accessory drive system according to claim 5, wherein the second accessory gear is fastened and fixed to the end of the rotary shaft of the second accessory with a fixing bolt, and the head of the fixing bolt and the 2 Between the end face of the auxiliary gear,
A friction gear that meshes with a meshing gear of the second auxiliary gear and is slidably in contact with the end surface of the second auxiliary gear is arranged in a state of being held by the fixing bolt toward the second auxiliary gear. An auxiliary machine drive device for an engine, which is characterized by being installed.