JP3079835B2 - Cylinder block structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder block structure, and more particularly to a cylinder block structure provided with a water pump mounting first boss for mounting at least a water pump at one end surface of a cylinder block in a crankshaft direction. About.

[0002]

2. Description of the Related Art Motorcycles, outboard motors, and vehicle engines have cylinders arranged in series,
There are ones in which cylinders are arranged to face each other, and a V-type engine in which each cylinder bank is arranged in a V-shape.

[0003] The V-type engine is constructed by mounting first and second cylinder heads on first and second cylinder banks of a cylinder block. The first and second cylinder heads are provided with first and second cylinder head covers.

A crankshaft extending in the longitudinal direction of the engine is rotatably provided substantially at the center of the cylinder block. Auxiliary devices such as a camshaft of a valve train and a water pump are driven by the crankshaft.

[0005] As a cooling device for a V-type engine,
As disclosed in Japanese Utility Model Laid-Open No. 1-95529, a water pump is disposed at a position above the output shaft at an intermediate portion between two banks arranged in a V-shape around the output shaft,
In one of the banks, a suction port communicating with the impeller shaft center of the water pump is formed, and the outlet opening of the delivery port is a cooling device for a V-type engine provided above the lowermost end of the pump chamber of the water pump. The suction port is provided so as to overlap the lowermost end of the pump chamber when viewed in the axial direction of the water pump and to be inclined obliquely downward from the overlap portion toward the inlet side. In some cases, a communication path for communicating the lowermost end of the chamber with the suction port is formed.

[0006]

By the way, conventionally, FIG.
As shown in the figure, a water pump (not shown) is provided at an upper part on one end surface of the cylinder block 104 in the crankshaft direction.
First boss 154 for mounting a water pump
A second boss portion 158 for attaching a chain tensioner adjuster (not shown) is provided diagonally below the first boss portion 154.

The water pump is connected to an auxiliary pulley fixed to the crankshaft by an auxiliary belt,
Since the rotational motion is performed in synchronization with the crankshaft by the rotational force from the crankshaft, it is considered that the water pump also generates rotational vibration and rotational fluctuation.

Therefore, it is necessary to ensure that the first boss to which the water pump is attached has sufficient strength and rigidity. However, there are cases where the thickness of the first boss portion cannot be made sufficient due to restrictions on the shape and layout of the water pump. In such a case, there is a fear that the first boss portion may be damaged when the engine rotates at a high speed, which is disadvantageous in practical use.

Further, the chain tensioner adjuster has a large influence of vibration generated by the timing chain. For this reason, when the strength and rigidity of the second boss portion cannot be sufficiently increased due to layout restrictions or the like, the second boss portion may be damaged by the behavior of the timing chain, similarly to the first boss portion described above. However, there is a disadvantage that it is disadvantageous in practical use.

[0010]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides a water pump mounting first boss for mounting a water pump on one end surface of a cylinder block in a crankshaft direction. And a joint portion having a joint surface parallel to the crankshaft direction for attaching other parts, wherein the first boss is provided at one end surface of the cylinder block in the crankshaft direction. In order to improve the strength and rigidity of the portion, a reinforcing rib for the first boss portion communicating from the first boss portion to the joining portion is provided in a substantially straight line.

A first boss portion for mounting a water pump for mounting a water pump and a second boss portion for mounting a chain tensioner adjuster for mounting a chain pump adjuster are provided at one end surface of the cylinder block in the crankshaft direction. In the cylinder block structure described above, the cylinder block is provided with a first reinforcing rib communicating with the first boss portion, and a second reinforcing rib connected to the first reinforcing rib and communicating with the second boss portion. It is characterized by having been provided.

[0012]

According to the invention described above, the strength and rigidity of the first boss portion are enhanced by the first boss portion reinforcing rib communicating from the first boss portion to the joining portion at one end surface of the cylinder block in the crankshaft direction. Have improved.

Further, at one end surface of the cylinder block in the crankshaft direction, a first reinforcing rib connected to the first boss portion improves the strength and rigidity of the first boss portion.
The second reinforcing rib connected to the reinforcing rib and connected to the second boss improves the strength and rigidity of the second boss.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. In FIG. 3, 2 is an engine, for example, a V-type engine, 4 is a cylinder block, 6-1 and 6-2 are first,
The second cylinder heads 8-1 and 8-2 are first and second cylinder banks.

In the V-type engine 2, first and second cylinder heads 6-1 and 6-2 are mounted on a cylinder block 4, and the first and second cylinder banks 8-1 and 8- are formed in a substantially V shape.
2 are arranged.

The cylinder block 4 is provided with a single crankshaft 10 supported in the longitudinal direction in cooperation with the bearing cap 9. The bearing cap 9 is another part of the cylinder block 4,
Joint portion 11 of the lower surface portion forming a joint surface 11A parallel to the crankshaft direction (the axial direction of the crankshaft 10)
Attached to. An oil pan (not shown) is attached to a lower portion of the bearing cap 9. The cylinder block 4 is provided with first and second cylinders (not shown), and first and second pistons (not shown) are mounted respectively. The first and second pistons are first and second pistons (not shown).
It is connected to the crankshaft 10 by connecting.

At one end of the crankshaft 10, for example, a sprocket 12 for the crankshaft 10 is mounted.

Further, two first camshafts 16 for the intake valve and the first camshaft 18 for the exhaust valve are respectively disposed in the first head cover 14-1 of the first cylinder head 6-1. Head cover 1 of second cylinder head 6-2
In 4-2, two intake valve second camshafts 20 and exhaust valve second camshafts 22 are respectively disposed.

The first and second cylinder heads 6
The first and second intake valve camshafts 16 and 20 are located on the space portion 24 side sandwiched between -1 and 6-2.

Further, small-diameter sprockets 26, 2 are attached to one ends of the first intake camshaft 16 and the first exhaust camshaft 18, respectively.
8 are arranged respectively.

A large-diameter sprocket 30 and a small-diameter sprocket 32 having the same shape as the small-diameter sprockets 26 and 28 are provided at one end of the second cam shaft 20 for the intake valve, and at one end of the second cam shaft 22 for the exhaust valve. Is a small diameter sprocket 2
A small diameter sprocket 34 having the same shape as 6, 28, 30 is provided.

An intermediate shaft 36 is provided between the crankshaft 10 and the two intake valve first camshafts 16 and exhaust valve first camshafts 18 of the first cylinder head 6-1. A large diameter sprocket 38 and a small diameter sprocket 40 are provided at one end of the shaft 36, respectively.

The large sprocket 30 of the second camshaft 20 for the intake valve, the large sprocket 38 of the intermediate shaft 36, and the sprocket 12 of the crankshaft 10 of the second cylinder head 6-2 are connected to the first timing chain. The communication is provided by 42.

The two small diameter sprockets 26 and 28 of the first camshaft 16 for the intake valve and the first camshaft 18 for the exhaust valve of the first cylinder head 6-1 and the small diameter sprocket 40 of the intermediate shaft 36 are combined. The second timing chain 44 is provided in communication therewith.

The small-diameter sprockets 32 and 34 of the two intake valve second camshafts 20 and the exhaust valve second camshafts 22 provided on the second cylinder head 6-2 are connected to a third timing chain 46. Will be provided by contact.

Further, the crankshaft 10 and the oil pump 48 are connected by a fourth timing chain 50.

The first to fourth timing chains 42, 44, 46 and 50 are covered with a timing chain cover (not shown).

A first boss portion 54 for mounting a water pump 52 is provided at one end surface of the cylinder block 4 in the direction of the crankshaft, at which the water pump 52 is mounted at a position slightly deviated toward the second cylinder head 6-2. And the second cylinder bank 8 of the first boss portion 54.
A second boss portion 58 for attaching the chain tensioner adjuster 56 is provided diagonally downward on the -2 side.

A water pump pulley (not shown) of the water pump 52 is connected to a crank pulley (not shown) fixed to the crankshaft 10 by a drive belt (not shown).

The chain tensioner adjuster 56 includes:
As shown in FIGS. 2A, 2B and 2C, the main body 60
And a rotating shaft 62 provided in the main body 60, and a contact surface 64 provided at one end of the rotating shaft 62. Reference numeral 66 denotes a ratchet.

Further, the cylinder block 4 has first reinforcing ribs 68 serving as reinforcing ribs for the first boss portions 54 connected to the first boss portions 54 in order to improve the strength and rigidity of the first boss portions 54. And the first reinforcing rib 6
8 and a second reinforcing rib 70 connected to the second boss portion 58 is provided.

More specifically, as shown in FIG. 1, the first reinforcing rib 68 is substantially straight from the first boss 54 to the joint 11 on the lower surface of the cylinder block 4, and has a gradually increasing width. That is, the upper width W on the first boss portion 54 side
1 and a lower width W2 larger than the above upper width W1 at the joint portion 11 side.

The second reinforcing ribs 70 extend substantially parallel to the rotation axis 62 of the chain tensioner adjuster 56 and are formed to stop the contact surface 64 of the chain tensioner adjuster 56 from rotating. Member 7
2-1 and 72-2. As shown in FIG. 2B, the end portions of the rib members 72-1 and 72-2 are provided on the contact surface 64 of the chain tensioner adjuster 56.
Plays the detent.

Next, the operation will be described.

The strength and rigidity of the first boss portion 54 are improved by the first reinforcing rib 68 connected to the first boss portion 54 for mounting the water pump provided at one end surface of the cylinder block 4 in the crankshaft direction. Further, the strength and rigidity of the second boss portion 58 are improved by the second reinforcing rib 70 which is connected to the first reinforcing rib 68 and communicates with the second boss portion 58 for mounting the chain tensioner adjuster 56 for mounting the chain tensioner adjuster 56. doing.

As a result, the strength and rigidity of the first boss portion 54 can be improved, and the first boss portion 54 can be prevented from being damaged due to rotational vibration or rotation fluctuation when the water pump 54 is driven.
In addition to being practically advantageous, the second boss portion 58 can be prevented from being damaged by the behavior of the first timing chain 42 when the engine 2 is driven, which is practically advantageous.

Further, the second reinforcement rib 70 is formed so as to extend substantially parallel to the rotation axis 62 of the chain tensioner adjuster 56 and to stop the rotation at the contact surface 64 of the chain tensioner adjuster 56, so that the chain tensioner adjuster can be improved. The contact surface 64 of the chain 56 can be prevented from rotating, and the chain tensioner adjuster 56 can be used.
Can be prevented from burning, which is practically advantageous,
The detent member provided in the conventional chain tensioner adjuster can be omitted.

[0039]

According to the present invention, as described in detail above, the first boss portion is provided on one end surface of the cylinder block in the crankshaft direction so as to improve the strength and rigidity of the first boss portion.
By providing the reinforcing ribs for the first boss portion communicating from the boss portion to the joint portion in a substantially linear shape, the strength and rigidity of the first boss portion can be improved, and the vibration and rotation fluctuation at the time of driving the water pump can be improved. This is practically advantageous because damage to the first boss can be prevented.

Further, the first reinforcing rib connected to the first boss portion is provided on the cylinder block, and the second reinforcing rib connected to the first reinforcing rib and connected to the second boss portion is provided. (1) The strength and rigidity of the boss portion can be improved, and the first boss portion can be prevented from being damaged due to rotational vibration or rotation fluctuation when the water pump is driven, which is practically advantageous and, at the same time, the behavior of the chain when the engine is driven. This can prevent breakage of the second boss due to the above, which is practically advantageous.

[Brief description of the drawings]

FIG. 1 is a front view of a cylinder block showing an embodiment of the present invention.

FIG. 2A is a front view of a chain tensioner adjuster. (B) It is a right side view of a chain tensioner adjuster. (C) It is a bottom view of a chain tensioner adjuster.

FIG. 3 is a front view of a V-type engine when a timing chain is provided.

FIG. 4 is a front view of a cylinder block showing a conventional technique of the present invention.

[Explanation of symbols]

 2 V-type engine 4 Cylinder block 6 Cylinder head 10 Crankshaft 52 Water pump 54 First boss portion 56 Chain tensioner adjuster 58 Second boss portion 60 Main body portion 62 Rotation shaft 64 Contact surface 66 Ratchet 68 First reinforcement rib 70 Second reinforcement Rib 72 Rib member

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-249944 (JP, A) JP-A-61-132465 (JP, U) JP-A-3-127040 (JP, U) JP-A-2-127 52945 (JP, U) Japanese Utility Model 1-173334 (JP, U) Japanese Utility Model 3-95035 (JP, U) Japanese Utility Model 1-95529 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) F02F 1/00-7/00 F01P 5/10 F02B 67/06

Claims (3)

(57) [Claims] 1. A one end face portion of the crankshaft direction of the cylinder block, click to attach the first boss portion of the water pump attached to attach the water pump, and other components
In a cylinder block structure in which a joint portion to form a parallel joint surfaces relative rank axis provided, in the crankshaft direction of the silicon <br/> Sunda block on one end surface portion of the first boss portion In order to improve strength and rigidity , the first
A cylinder block structure, wherein a reinforcing rib for the first boss portion communicating from a boss portion to the joining portion is provided in a substantially linear shape . To 2. A one end surface portion of the crankshaft direction of the cylinder block, a first boss portion of the water pump attached to attach the water pump, the second delay tensioner adjuster attachment for attaching the chain tensioner adjuster
In the cylinder block structure provided with the boss portion,
A first reinforcing rib connected to the first boss is provided at one end surface of the cylinder block , and a second reinforcing rib connected to the first reinforcing rib and connected to the second boss is provided. A cylinder block structure characterized by the following. Wherein the second reinforcing rib, two formed so as to perform detent on the contact surfaces of and the <br/> thien tensioner adjuster extends substantially parallel to the axis of rotation of the chain tensioner adjuster The cylinder block structure according to claim 2, wherein the second reinforcing rib is a second reinforcing rib made of a rib member.