JP3214806B2 - Engine balancer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine for reducing the vibration of an engine by rotatably supporting a balancer shaft provided with a balancer weight on an engine block and rotating the balancer shaft in conjunction with a crankshaft. It relates to a balancer device.

[0002]

2. Description of the Related Art Conventionally, a balancer shaft of a balancer device of an engine is housed inside an engine block and connected to a crankshaft of the engine via a timing belt or a gear (for example, Japanese Utility Model Publication No. Sho 63-163).
No. 23624).

[0003]

However, when the balancer shaft is housed inside the engine block,
There was a problem that the engine block became large and the weight increased. In the case of a primary balancer, the weight of the balancer weight can be reduced as the distance between the two balancer weights provided at both ends of the balancer shaft is increased. Since they are provided integrally, the degree of freedom in designing the mounting position of the balancer weight is low, and it is difficult to arrange the balancer weight at the optimum position.

[0004] The present invention has been made in view of the above circumstances, by appropriately supporting the balancer shaft,
The purpose is to reduce the weight of engine blocks and balancer weights.

[0005]

According to one aspect of the present invention, a balancer shaft having a balancer weight is rotatably supported on an engine block, and the balancer shaft is connected to a crankshaft. In a balancer device for an engine, which reduces the vibration of the engine by rotating in synchronism with the engine block, at least a part of the balancer shaft is disposed outside the side wall of the engine block, and the outer periphery of the balancer shaft is supported by the engine block. Stored inside the member ,
Balancer weights at both ends of the balancer shaft
And journals.
Attached to both ends of the engine block separately from the lock
Supported through a shaft holder
At least one shaft holder and engine block
Between the flanges formed in the pipe member,
The pipe member is positioned in the axial direction .

According to a second aspect of the present invention, there is provided a balun.
Use the balancer shaft with sur
The balancer shaft is rotatably supported by a lock.
By rotating in synchronization with the crankshaft,
Engine balancer device that reduces gin vibration
To at least part of the balancer shaft.
This balancer shuffle is placed outside the side wall of the
Of the pipe member whose outer periphery is supported by the engine block
And the engine block and the block
To form a space between the mounting bracket
Place the balancer shaft and pipe member in the space
Characterized in that was.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 8 show an embodiment of the present invention. FIG. 1 is a front view of a vertical V-type engine, FIG. FIG.
FIG. 5 is a cross-sectional view taken along line 4-4 of FIG.
7 is a sectional view taken along line 6-6 of FIG. 4, FIG. 7 is a sectional view taken along line 7-7 of FIG. 2, and FIG. 8 is a view showing an assembling procedure of the balancer device.

As shown in FIG. 1, an engine block 2 of a vertical V-type six-cylinder engine E in which a crankshaft 1 is arranged in the front-rear direction of the vehicle body has a left bank 3 _L extending leftward on the vehicle body and a right bank extending rightward. A right bank _3R is provided. A camshaft driven pulley 5 _L provided on the cam shaft 4 _L which is supported on the left bank 3 _L, and a cam shaft driven pulley 5 _R provided on the cam shaft 4 _R which is supported on the right bank 3 _R, provided in the crankshaft 1 Camshaft drive pulleys 6 and 2
The timing belt 9 is wound around the tension pulleys 7 and 8.

[0010] The cam shaft driven pulley of the left bank 3 _L 5
Front of the _L and the right bank 3 _R camshaft driven pulley 5 _R are left timings belt upper cover 10 _L
And covered by the right timing belt upper cover 10 _R. The front of the two tension pulleys 7 and 8
The upper and lower timing belt covers 10 _L and 10 _R are covered by a lower timing belt cover 11.

As is apparent from FIG.
Balancer shaft 12 below the right bank 3 _R are supported parallel to the crankshaft 1, the balancer shaft 12 is driven by the crankshaft 1 via the intermediate shaft 13 to be described later. That is, a balancer shaft drive pulley 14 provided on the crankshaft 1,
A timing belt 17 is wound around a balancer shaft driven pulley 15 provided on the intermediate shaft 13 and a tension pulley 16, and the driving force of the crankshaft 1 is transmitted to the balancer shaft 12.

A first oil passage 19 extends from the oil pump 18 driven by the crankshaft 1 to the right of the vehicle body, and a second oil passage 20 extending upward from the end of the first oil passage 19 is connected to the balancer shaft 12. And intermediate shaft 1
3 is connected. The radiator R disposed in front of the engine E has left and right fan openings 21 _L and 21 _R , and the first and second oil passages 19 and 2 are located within the rear projection area of the fan opening 21 _R on the right side of the vehicle body. 20 are located. Thus, it is possible to cool the lubricating oil in the cooling air passing through the fan opening 21 _R.

[0013] FIGS As shown in, the engine right front block 2 are superposed oil pump body 25 and the gear case 26 is a further timing belt cover 2 on the mating surface 26 ₄ formed on the front surface of the gear case 26
7 are superimposed. Said first, second oil passage 19 is formed inside the rib 26 _2, 26 ₃ projecting from the front surface of the gear case 26, the downstream end of the first oil passage 19 and a second
The upstream end of the oil passage 20 is closed by blind plugs 28 and 29, respectively (see FIG. 3). When the timing belt cover 27 is overlaid on the front surface of the gear case 26, the gear case 2
Some of 6 is exposed to the vehicle body front side, a first on the exposed portion, by for exposing a portion of the second oil passage 19 (see FIG. 1), also ribs 26 _2, 26 ₃ The first inside,
By forming the second oil passages 19 and 20, cooling of the lubricating oil by the cooling air is promoted.

The balancer shaft 12 has an engine block.
The vehicle 2 is disposed in the vehicle front-rear direction along the right outer surface. Ba
On the front side (right side in FIG. 4) of the lancer shaft 12,
1st journal 12₁And the second journal 12_TwoFormed
At the same time, on the rear side (the left side in FIG. 4),
Journal 12_ThreeIs formed. 1st journal 12₁Is
Formed in the gear case 26 as a shaft holder
Journal bearing 26 ₁Supported by the second journal
Le 12_TwoIs the oil pump as a shaft holder
Journal bearing 25 formed on body 25₁Supported by
You. Shaft holder 3 at the rear end of engine block 2
0 is fixed with a bolt 31 via a seal member 22.
And a journal shaft formed on the shaft holder 30.
Receiving 30₁The third journal 12_ThreeIs supported.

Intermediate shaft 1 supported on gear case 26
Drive gear 32 formed integrally with the rear end of the 3, meshing with the first driven gear 33 press-fitted on the rear side of the journal 12 _first balancer shaft 12. The tooth ratio between the balancer shaft drive pulley 14 and the balancer shaft driven pulley 15 and the tooth ratio between the drive gear 32 and the driven gear 33 are as follows:
The balancer shaft 12 is set to rotate at the same speed as the crankshaft 1. The rotation direction of the balancer shaft 12 is opposite to the rotation direction of the crankshaft 1 due to the engagement of the drive gear 32 and the driven gear 33.

[0016] Figure 4 and is apparent from FIG. 5, the second journal 12 ₂ and the driven gear 3 of the balancer shaft 12
3, a first fan-shaped balancer weight 34 having a substantially fan shape is connected by press-fitting. Drive gear 32, driven gear 3
3 and the first balancer weight 34 is accommodated in the recess 25 ₂ which opens in front of the oil pump body 25. The front end of the balancer shaft 12, the tool is a hexagonal-shaped head engageable 12 ₄ are formed integrally.

As is apparent from FIGS. 4 and 6, a substantially fan-shaped second balancer weight 35 is fitted to the rear end of the balancer shaft 12 and connected by bolts 36. The second balancer weights 35 are accommodated in the recesses 30 ₂ formed on the shaft holder 30, it is covered by a cover 24 which is fastened by the bolt 31. The bolt 36 is reverse-threaded so as not to be loosened with the rotation of the balancer shaft 12. Moreover, the inner surface of the cover 24 has bolts 36
With a slight gap α at the head of
If the bolt 6 is loosened, the bolt 36 is prevented from falling off, and the balancer shaft 12 of the second balancer weight 35 can be prevented.
From falling off is prevented.

The center portion (the fitting portion with the balancer shaft 12) of the second balancer weight 35 is formed to be relatively thin, but the outer peripheral portion protrudes toward the front side in the axial direction and the rear side in the axial direction, and is relatively formed. In particular, the thick portion that protrudes forward in the axial direction is the shaft holder 30.
Covers the radially outer journal bearing 30 ₁ (see FIG. 4). This makes it possible to reduce the size of the radial dimension to the second balancer weights 35 by effectively utilizing the internal space of the recess 30 ₂ formed on the shaft holder 30.

[0019] As is apparent from FIG. 4, fitting the front and rear ends of the pipe member 37 to the front support hole 2 ₄ and the rear support hole 2 ₅ formed in the engine block 2 through a seal member 38, 39 engages and, the intermediate portion 12 ₅ of the balancer shaft 12 is housed inside of the pipe member 37. The front end of the diameter of the pipe member 37 (i.e., the diameter of the front support hole 2 ₄₎ the rear end of the diameter (i.e., the diameter of the rear support hole 2 ₅₎ is formed smaller than, also the intermediate portion of the pipe member 37 Is formed smaller than the diameter of the front end and the diameter of the rear end.

As is clear from FIGS. 2 and 7, a mounting bracket 42 is connected to the right side surface of the engine block 2 by four bolts 40,. A flange 43 projecting from the differential D is fastened between the mounting bracket 42 and the mounting bracket 42. The mount bracket 42 is supported on a vehicle body frame (not shown) via an engine mount 44. In this way, by disposing the balancer shaft 12 and the pipe member 37 in the space 45 formed between the engine block 2 and the mount bracket 42, the mount bracket 42 covers the outside of the balancer shaft 12 and the pipe member 37. Can be protected.

As it is apparent from FIG. 4, in order to perform the phasing of the balancer shaft 12 when assembling the balancer apparatus, the tool insertion hole 2 ₆ facing the tool insertion hole 12 ₆ formed on the balancer shaft 12 of the engine block 2 Drilled in front. The accessory mounting bracket 47 (or the cover of the exhaust manifold) and the like are fastened together by the sealing bolt 46 that closes the tool insertion hole ₂₆ of the engine block 2. The accessory mounting bracket 47 functions as a protection member that covers the balancer shaft 12 and the pipe member 37.

The assembly of the balancer device is performed in the following procedure.

FIG. 4 and 8, the pipe member 3 to the front support hole 2 ₄ and the rear support hole 2 ₅ of the cylinder block 2
7 is inserted in the direction of arrow A. In this case, first, the seal member 38 mounted on the small diameter side of the front end of the pipe member 37 is fitted to the inner periphery of the front support hole 2 _4, followed by sealing member attached to the rear end of the large-diameter side of the pipe member 37 39 fits inside the rear support hole ₂₅ . Thus, the two seal members 38, 3
9 by inserting with a front support hole 2 ₄ and the rear support hole 2 ₅ two hours difference, it is possible to facilitate the assembly by reducing the insertion load.

Subsequently, the oil pump body 25 is connected to the front end face of the cylinder block 2, and the balancer shaft 12 into which the first balancer weight 34 and the driven gear 33 are press-fitted in advance is inserted in the direction of arrow B. Subsequently, after the shaft holder 30 is coupled to the rear end surface of the cylinder block 2, the second balancer weight 35 is fixed to the rear end of the balancer shaft 12 with bolts 36, and the cover 24 is fixed to the rear portion. In combining the shaft holder 30 to the rear end surface of the cylinder block 2, a flange 37 ₁ formed on the rear end of the pipe member 37 is sandwiched between the front end of the stepped portion and the shaft holder 30 of the engine block 2, thereby The pipe member 37 can be positioned in the axial direction without using a special positioning member (see FIG. 4). In order to support the tightening torque of the bolt 36 when fixing the second balancer weights 35, a hexagonal shaped head 12 ₄ of the front balancer shaft 12 to prevent rotation and fixed with a wrench S.
The chamfering of the hexagonal-shaped head 12 _4, the flow path cross-sectional area of the lubricating oil flowing therethrough can be sufficiently secured.

[0025] followed by the engine block 2 and the tool insertion hole 2 _6, 12 ₆ by inserting the pin-like tool to determine the phase of the balancer shaft 12, the drive gear 32 and the driven gear 33 in this state of the balancer shaft 12 After the engagement, the gear case 26 is connected to the front surface of the oil pump body 25. And the balancer shaft drive pulley 14,
After wound a timing belt 17 to the balancer shaft driven pulley 15 and tension pulley 16, the tool insertion hole 2 _6, 12 ₆ to removing the tool from the balancer device screwed the tool insertion hole 2 ₆ sealing bolts 46 Complete the assembly.

Next, lubrication of the balancer device will be described.

As is apparent from FIG. 4, a third oil passage 50 extends through the inside of the balancer shaft 12 in the axial direction, and the front end of the third oil passage 50 is formed by the second oil passage formed in the gear case 26. Connect to 20. Balancer shaft 1
The second front with oil hole 51 communicating with the second outer periphery of the journal 12 ₂ extending radially is formed from the third oil passage 50, the rear portion of the balancer shaft 12 radially from the third oil passage 50 oil hole 52 communicating with the third outer circumference of the journal 12 ₃ extending in direction is formed.

A fourth oil passage 53 is formed between the outer periphery of the balancer shaft 12 and the inner periphery of the pipe member 37, and the front end of the fourth oil passage 53 has a concave portion 2 formed at the front end of the cylinder block 2. ₇ series through the rear end communicates with the recess 30 ₂ formed on the shaft holder 30.

[0029] In Thus, the lubricating oil discharged from the oil pump 18 flows into the second oil passage 20 via the first oil passage 19 of the gear case 26, lubricating the outer peripheral surface of the first journal 12 _first balancer shaft 12 And the intermediate shaft 13
Lubricate the outer peripheral surface of. Part of the lubricating oil flowing through the second oil passage 20 flows into the third oil passage 50 of the balancer shaft 12,
Thereby lubricate the outer peripheral surface of the second journal 12 _second balancer shaft 12 via the oil hole 51, to lubricate the outer peripheral surface of the third journal 12 ₃ of the balancer shaft 12 via the oil hole 52. First and second journals 12 ₁ , 12
The lubricating oil that has leaked from the ₂ in the recess 25 ₂ of the oil pump body 25 is scraped up by the first balancer weight 34 is rotated in the arrow direction in FIG. 5, oil holes 25 ₃ and the engine block formed in the lower portion of the concave portion 25 ₂ The oil is returned to the oil pan through an oil passage (not shown) formed in the inside 2.

The lubricating oil that has flowed into the third journal 12 ₃ pipe member 37 leaks to the front from reaching concave portion 2 ₇ of the cylinder block 2 through a fourth oil passage 53 is returned therefrom to the oil pan. The lubricating oil that has flowed from the third journal 12 ₃ in the recess 30 _{and second} shaft holder 30 leaks to the rear, or the lubricating oil flowing from the fourth oil passage 53 into the recess 30 _{and second} shaft holder 30 via the oil hole 54 , scooped up by the second balancer weights 35 rotating in the arrow direction in FIG. 6, it is returned to the oil pan through the oil hole 30 ₃ formed at the bottom of the recess 30 _2.

As described above, the balancer shaft 12
Since the third oil passage 50 opening at the front end of the second oil passage 50 is communicated with the second oil passage 20 that supplies the lubricating oil to the intermediate shaft 13, a special oil guiding the third oil passage 50 to the third oil passage 50 of the balancer shaft 12. Not only is the oil passage unnecessary, but also the balancer shaft 12
The lubricating oil can be smoothly supplied to the third oil passage 50 of the balancer shaft 12 without being affected by the centrifugal force caused by the rotation of the shaft. In addition, since the first and second oil passages 19 and 20 are formed in the gear case 26, machining is easier than when the first and second oil passages 19 and 20 are formed in the cylinder block 2.

When the crankshaft 1 is rotated by the operation of the engine E, the rotation is driven by the drive pulley 14,
The timing belt 17, the driven pulley 15, the intermediate shaft 13, the driving gear 32, and the driven gear 33 are transmitted to the balancer shaft 12 via the balancer shaft 12.
Is driven in the opposite direction at the same speed as the crankshaft 1 to suppress the primary vibration of the engine E.

The middle part 1 of the balancer shaft 12
Since ₂₅ is arranged outside the engine block 2, the size and weight of the engine block 2 are reduced as compared with the case where the entire balancer shaft 12 is housed inside the engine block 2. Further, the front end of the balancer shaft 12 is supported separately from the engine block 2 via an oil pump body 25 and a gear case 26 attached to the front end surface of the engine block 2, and the rear end of the balancer shaft 12 is mounted on the engine block 2. Since it is supported separately from the block 2 via the shaft holder 30 attached to the rear end face of the engine block 2, the journals 12 ₁ , 12, at both ends of the balancer shaft 12 can be formed without largely changing the shape of the engine block 2. 12 _2, 12 sufficiently to ensure the distance between the _3, both the balancer weights 34 and 35 can be easily supported in position. As a result, a sufficient distance between the balancer weights 34 and 35 can be ensured to reduce the weight of the balancer weights 34 and 35, and the balancer weights 34 and 35 can be connected to the journals 12 ₁ , 12 ₂ and 12 _3. , The balancer weights 34, 35 can be stably supported.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the primary balancer device that suppresses the primary vibration of the engine E is illustrated, but the present invention can be applied to a secondary balancer device that suppresses the secondary vibration of the engine E.

[0036]

According to the first aspect of the present invention, at least a part of the balancer shaft having the balancer weight and rotating in synchronization with the crankshaft is disposed outside the side wall of the engine block. Since the outer periphery of the balancer shaft is housed inside the pipe member supported by the engine block, the engine block can be made smaller and lighter than when the entire balancer shaft is arranged inside the engine block. Can protect the balancer shaft. Also, balancer wafers are attached to both ends of the balancer shaft.
Sites and journals, and manage these journals.
Separate from the engine block on both end faces of the engine block.
Since it is supported via the attached shaft holder,
Most of the distance between the ends of the lancer shaft is
The engine block is smaller because it is located outside the side wall of the engine
In addition to being able to reduce the weight, both balancer ways
To ensure the maximum distance between the balancer weights
The weight can be reduced. And in the engine block
On the other hand, balancer shaft with separate shaft holder
Supports, drastically changes the shape of the engine block
Balancer shaft and balancer weight without
Can be easily supported in the proper position,
The degree of freedom is greatly improved. In particular, at least one
Pipe section between the shaft holder and the engine block
Sandwich the flange formed on the material, and
Use a special positioning member.
It is possible to position the pipe member in the axial direction
The number of parts is reduced.

According to the second aspect of the present invention,
With balancer weights and synchronized with the crankshaft
At least part of the rotating balancer shaft.
This balancer shaft is located outside the side wall of the gin block.
Of the pipe member supporting the outer periphery of the shaft to the engine block
The entire balancer shaft was engineered because it was stored inside.
Engine block compared to the case where it is
Can be made smaller and lighter, and with pipe members
The balancer shaft can be protected. Especially
Engine block and mount coupled to the block
A space is formed between the bracket and the bracket.
Since the lancer shaft and pipe members are located,
Bracket for balancer shaft and pipe members
They can be covered to protect them.

[Brief description of the drawings]

FIG. 1 is a front view of a vertical V-type engine.

FIG. 2 is a view in the direction of arrows in FIG. 1;

FIG. 3 is a view in the direction of arrows in FIG. 2;

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

FIG. 5 is a view taken along line 5-5 in FIG. 4;

FIG. 6 is a view taken along line 6-6 of FIG. 4;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 2;

FIG. 8 is a diagram showing an assembling procedure of the balancer device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crankshaft 2 Engine block 12 Balancer shaft 12 ₁ 1st journal (journal) 12 ₂ 2nd journal (journal) 12 ₃ 3rd journal (journal) 25 Oil pump body (shaft holder) 26 Gear case (shaft holder) 30 Shaft holder 34 1st balancer weight (balancer weight) 35 2nd balancer weight (balancer weight) 37 Pipe member E engine

Continuation of the front page (56) References JP-A-2-217644 (JP, A) Japanese Utility Model Application Sho 60-127146 (JP, U) French Patent Application Publication 2619881 (FR, A1) (58) Fields investigated ( Int.Cl. ⁷ , DB name) F16F 15/26 F02B 77/00

Claims (2)

(57) [Claims] 1. A balancer shaft (12) having balancer weights (34, 35) is rotatably supported on an engine block (2), and the balancer shaft (12) rotates in synchronization with the crankshaft (1). An engine balancer device that reduces vibration of the engine (E) by disposing at least a part of the balancer shaft (12) outside a side wall of the engine block (2), and an outer periphery of the balancer shaft (12). To the engine block (2)
Stored inside the pipe member (37) supported by the
Balancer way on both ends of lancer shaft (12)
(34, 35) and journals (12 ₁ , 12 ₂ , 1)
2 ₃ ), and these journals (12 ₁ , 12 ₂ , 1)
2 ₃₎ The engine blanking separately from the engine block (2)
Shaft holder attached to both ends of lock (2)
-(25, 26, 30)
At least one shaft holder (30) and engine
Formed on the pipe member (37) between the lock and the lock (2)
Holding the flange (37 ₁ ), the pipe member (37)
A balancer device for an engine, characterized in that the engine is positioned in the axial direction . 2. A balancer weight (34, 35) is provided.
Set the balancer shaft (12) to the engine block
This balancer shaft is rotatably supported on (2).
Rotate (12) in synchronization with crankshaft (1)
Engine that reduces vibration of the engine (E)
In the balancer device of (1), at least a part of the balancer shaft (12) is
This balun is placed outside the side wall of the engine block (2).
The outer periphery of the surf shaft (12) is mounted on the engine block (2).
Stored inside the pipe member (37) supported by the
Block (2) and a matrix connected to the block (2).
Form space (45) between und bracket (42)
Then, the balancer shaft (1) is inserted into this space (45).
2) and it is characterized in that a pipe member (37), engine balancer apparatus.