JPH063153Y2 - Engine belt cover seal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is, for example, a belt cover for an engine in which an auxiliary machine is arranged on one side of a crankshaft core and a water pump is arranged on the other side of the crankshaft core when viewed from the crankshaft direction. Regarding the seal structure.

(Prior Art) Conventionally, as an engine of the above-mentioned example, for example, JP-A-63-6
There is an engine described in Japanese Patent No. 8723.

That is, when viewed from the crankshaft direction, an auxiliary machine such as an alternator is arranged on one side of the crankshaft core, and a water pump is arranged on the other side of the crankshaft, and the above-mentioned auxiliary machine is driven by the crankshaft via the water pump. Is.

In this conventional structure, a V belt is stretched between the crank pulley on the crankshaft, the pulley of the water pump, and the alternator pulley, and the water pump and the alternator are driven by the crankshaft, respectively.
The above-mentioned water pump casing is urged by the tension of the V-belt, and there is a problem that the rigidity of the water pump casing against this belt tension is not sufficient.

Further, since the outer circumference of the bearing boss of the water pump casing has a curved surface shape, for example, when the outer circumference of the bearing boss is sealed using two belt covers, a timing belt upper cover and a timing belt lower cover, a curved surface seal structure is used. Therefore, there is a problem that good sealing property cannot be obtained.

(Object of the Invention) The present invention aims to improve the rigidity of the casing of the water pump casing against the belt tension applied to the casing, and to improve the sealing performance of the mating portions of the upper and lower belt covers. It is intended to provide a belt cover seal structure.

(Structure of the Invention) According to the present invention, an auxiliary machine is arranged on one side of the crankshaft core and a water pump is arranged on the other side of the crankshaft core as viewed from the crankshaft direction, and the auxiliary machine is arranged by the crankshaft via the water pump. In an engine to be driven, a belt cover seal edge portion is formed on the outer periphery of a bearing boss of a water pump casing with a right angle on the one side above the outer periphery of the boss, and a belt cover upper portion and a lower portion are formed on the right angle belt cover edge portion. It is characterized in that it has a belt cover seal structure of an engine in which both seal portions of the belt cover of the engine are adjacent to each other.

(Effect of the Invention) According to this invention, since the above-mentioned right-angled belt cover seal edge portion is formed on the outer periphery of the bearing boss of the water pump casing, the expansion of the seal edge portion against the belt tension applied to the water pump casing. The protruding reinforcement structure can effectively improve the rigidity of the water pump casing.

In addition, since the mating portion of the upper and lower belt covers can be linearly sealed by the straight line on the upper surface and the straight line on the one side surface of the above-mentioned right-angled belt cover seal edge, the sealing performance can be improved. effective.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The drawing shows the engine belt cover seal structure,
In FIG. 2 and FIG. 2, a cylinder head 2 is fixed on a cylinder block 1, while a crankshaft 3 has a camshaft pulley 4 and a timing pulley 5 having a small diameter for driving 4.
A water pump 6 and a large-diameter crankshaft pulley 7 for driving an auxiliary machine are fitted together.

Further, when viewed from the direction of the crankshaft 3, an auxiliary machine such as a power steering pump 8 is arranged on one side of the shaft center of the crankshaft 3, and the water pump 6 described above is arranged on the other side of the shaft center.
Are installed.

Further, while the water pump pulley 12 is attached to the pump shaft 9 of the water pump 6 via the pulley hub 10 and the set bolts 11 ..., The power steering pump pulley 13 is attached to the pump shaft (not shown) of the power steering pump 8. Is mounted between the power steering pump pulley 13, the water pump pulley 12 described above, and the crankshaft pulley 7 described above.
The belt 14 is stretched so that the power steering pump 8 is driven by the crankshaft 3 via the water pump 6.

Here, the above-mentioned water pump 6 is provided with a water pump casing 16 in which a volute-shaped (spiral-shaped) cooling water passage 15 is formed on the end surface on the cylinder block 1 side,
The pump shaft 9 is rotatably mounted in the water pump casing 16 via a bearing 17, and
A mechanical seal 18 for preventing cooling water intrusion is attached near the inner end of the pump shaft 9, and an iron plate impeller 19 is attached to the inner end 9a of the pump shaft 9 to rotate the water pump pulley 12 described above. The cooling water is circulated between the water jacket and the radiator.

In addition, the outer periphery of the bearing boss 16a protruding into the timing belt chamber of the water pump casing 16 has the first
As shown in the drawing, a belt cover seal edge portion 20 having a right angle on the one side above the outer periphery of the boss 16a is formed, and a so-called right angle edge is formed, and at the same time, the water pump casing 1 is formed.
One of the ribs 16b radially provided on the outer surface of the six ribs 16b is connected to this right-angled edge.

By the way, a timing belt 22 is stretched between the timing pulley 5 fitted to the crankshaft 3 and the camshaft pulleys 4 and 4 fitted to the camshafts 21 and 21. It is configured to drive the cam shafts 21 and 21.

Then, a timing belt upper cover 23 that covers the upper area of the traveling path of the timing belt 22 and a timing belt lower cover 24 that covers the lower area of the traveling path are provided, and the upper timing belt upper cover 23 is set bolt 25.
, And the lower timing belt lower cover 24 is attached to the cylinder block 1 using set bolts 26.

The tensioner storage pocket portion 2 is provided on the timing belt upper cover 23 immediately above the water pump 6.
7 is formed, and the timing belt tensioner 28 is disposed in the tensioner storage pocket portion 27, so that the above-mentioned timing belt 22 is attached to the water pump casing 1.
6 is run inside the bearing boss 16a that does not interfere with the bearing boss 16a, the lower end of the timing belt upper cover 23 is located inside the water pump 6, and the water pump 6 is used as much as possible. The layout is arranged in the central direction, and the timing belt lower cover 24 is also made compact.

Further, an inverted L-shaped engine mount bracket 29 is attached to a predetermined position of the cylinder block 1 so as to be located on one side with respect to the timing belt tensioner 28 described above, and the engine mount bracket 29 travels on the timing belt 22. These covers 23, 2 are provided at the substantially central portion of the road and between the upper and lower timing belt covers 23, 24.
4 Out to the outside.

Here, the engine mount bracket 29 described above has a stay 29a and mount member mounting bolts 30 and 30 at the lead-out end. For example, when the engine is mounted horizontally and mounted on the vehicle body, a plate (not shown) on the vehicle body side is shown. No)
And an engine mount is performed by interposing a mount member between this and the engine mount bracket 29.

Sealing members 31 and 32 are attached to the lower portion of the timing belt upper cover 23 and the upper end of the timing belt lower cover 24 in the vertically opposed portions of the engine mount bracket 29, and these upper and lower sealing members 31 and 32 are mounted. The upper and lower surfaces of the engine mount bracket 29 and the fitting portion between the upper and lower covers 23 and 24 are sealed by.

Further, the lower end of the tensioner storage pocket portion 27 of the timing help upper cover 23 is adjacent to the above-mentioned right-angled belt cover seal edge portion 20, and the other side upper portion of the timing belt lower cover 24 is adjacent to the right-angled belt cover seal edge portion 20. Then, the seal members 33, 34 are attached to both the lower end of the timing belt upper cover 23 and the upper part of the timing belt lower cover 24 in the portion adjacent to the right-angled edge. Timing belt cover 2
The mating portion between 3, 24 and the outer peripheral portion of the bearing boss 16a of the water pump 6 are sealed.

In this way, since the belt cover seal edge portion 20 is formed on the outer periphery of the bearing boss 16a of the water pump casing 16 with the above-described specific direction being a right angle, the seal edge portion 20 is formed.
Due to the bulging reinforcement structure, the rigidity of the water pump casing 16 is effectively improved against the belt tension in the direction of arrow b applied to the water pump casing 16 when the V-belt 14 is driven in the direction of arrow a. There is an effect that can be achieved.

In addition, since the above-mentioned right and left timing belt covers 23, 24 are linearly sealed at the above-mentioned right-angled belt cover seal edge portion 20 and the straight portion on one side surface, the sealing performance of the portions is improved. There is an effect that can be improved.

Further, as shown in the embodiment, the timing belt tensioner 28 is arranged above the water pump 6, the engine mount bracket 29 is arranged on one side of the timing belt tensioner 28, and the timing belt tensioner 28 is arranged below the timing belt upper cover 24. When the pocket portion 27 for accommodating the tensioner 28 described above is formed in the
The layout of 8, 29 is simple, and the timing belt covers 23, 24 can be made compact.

In the correspondence between the configuration of the present invention and the above-described embodiment, the accessory of the present invention corresponds to the power steering pump 8 of the embodiment, and hereafter, the upper belt cover corresponds to the timing belt upper cover 23. The lower belt cover is the timing belt lower cover 2.
However, this invention is not limited to the configuration of the above-described embodiment.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a front view showing a belt cover seal structure of an engine, and FIG. 2 is an enlarged cross-sectional view of the main part taken along the line II-II of FIG. 3 ... Crankshaft, 6 ... Water pump 8 ... Power steering pump 16 ... Water pump casing 16a ... Bearing boss 20 ... Belt cover seal edge 23 ... Timing belt upper cover 24 ... Timing belt lower cover

Claims (1)

[Scope of utility model registration request] 1. An engine in which an auxiliary machine is arranged on one side of a crankshaft core and a water pump is arranged on the other side of the crankshaft core, and the auxiliary machine is driven by the crankshaft via the water pump. A belt cover seal edge portion is formed on the outer circumference of the bearing boss of the water pump casing so that one side of the outer circumference of the boss has a right angle, and the right belt cover edge portion has an upper belt cover and a lower belt cover. The engine belt cover seal structure in which both seal parts are adjacent.