JP2501663Y2 - Oil pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an oil pump that is rotationally driven by a crankshaft of an engine through a chain, and facilitates attachment of a sprocket to a rotational drive shaft of the oil pump. It is a thing.

<Prior Art> An oil pump is used as a pumping means for the lubricating oil in each part of the engine. There are various types of oil pumps such as a trochoid type and a gear type, and all of these are directly connected to the crankshaft of the engine and driven, or the crankshaft and the drive shaft of the oil pump are connected to a sprocket and It was driven by connecting it with a power transmission mechanism such as a chain.

As shown in FIG. 3 as an example of such a conventional oil pump and its mounting structure, a crankshaft 12 arranged in the cylinder block 11 in a penetrating state on the left and right in the drawing is rotatable via a bearing 13. Supported by. A lower case 14 is fixedly mounted on the lower end surface of the cylinder block 11 as a reinforcing member of the cylinder block 11, and a trochoidal type oil pump 15 is provided on the lower end surface of the lower case 14 front end portion (right end portion in the figure). Is fixed.

At the right end of the oil pump 15 in the figure, suction oil,
One end of a rotary drive shaft 16 for rotationally driving a pressurizing rotor portion (not shown) for pressurizing and discharging projects. A fitting portion 18 into which a sprocket 17 is fitted is formed at one end of the rotary drive shaft 16. Meanwhile, the cylinder block 11
At the right end in the figure of the crankshaft 12 that protrudes more,
While the sprocket 19 is fitted, between the sprocket 19 and the sprocket 17 fitted to the fitting portion 18 of the oil pump 15, a chain 20 is wound.
Therefore, the rotation of the crankshaft 12 causes the oil pump 15
The rotary drive shaft 16 rotates to operate the oil pump 15.

The structure of the fitting portion 18 for fixing the sprocket 17 to the fitting portion 18 of the oil pump 15 is as follows. That is, as shown in the perspective view of only the fitting portion 18 in FIG. 4, the shape of the fitting portion 18 is rotated so that the sprocket 17 is fixed to the fitting portion 18 in a non-rotatable state. An asymmetrical locking portion 21, that is, a so-called D cut portion formed by cutting a part of a disc-shaped fitting portion 18 in this embodiment is provided. Therefore, in the fitting insertion hole 22 of the sprocket 17 into which the fitting portion 18 is fitted, the engaging portion 23 that fits the already-described engaging portion 21 is also formed so that they do not rotate relative to each other. ing.

Further, the fitting portion 18 of the oil pump 15 is formed with female screw portions 24 on the left and right in the drawing, and therefore the sprocket 17 is fitted to the fitting portion 18 of the oil pump while fitting the mutual locking portions, Fitting part 18 with bolt 26 already mentioned via washer 25
The sprocket 17 is fixed to the fitting portion 18 of the oil pump 15 by being screwed into the female screw portion 24 and tightened.

<Problems to be Solved by the Invention> Conventional oil pump 15 as already described with reference to FIG.
When installing the chain, first wind the chain 20 around the sprocket 19 fitted to the crankshaft 12, and then attach another chain to the lower end of the chain 20 in the figure.
While holding 17, keep the sprocket 17
The drive shaft 16 is fitted into the fitting portion 18 of the drive shaft 16 and is fixed by tightening the bolt 25 or the like.

By the way, each of the sprocket 17 and the fitting portion 18 is formed with locking portions 23 and 21 for preventing mutual rotation, so that fine adjustment to adjust the positions of these locking portions to each other is required. The sprocket 17 must be mounted on the fitting portion 18 while performing. However, since a relatively large force is required to rotate the sprocket 19 fitted to the crankshaft 12 at the time of this fine adjustment, the fitting portion 18 of the oil pump 15 is usually rotated to rotate the locking portion 21. However, since the fitting portion 18 is located on the back side of the sprocket 17 and the chain 20, there is a problem that it is extremely difficult to rotate the fitting portion 18 and the chain 20.

<Means for Solving the Problems> An oil pump according to the present invention is an oil pump that is rotationally driven via a chain by the rotation of a crankshaft of an engine, in which the chain is wound around a rotational drive shaft of the oil pump. A locking portion is formed which enables the rotation drive shaft and the sprocket to be fitted together with the matching of the direction of the sprocket in the circumferential direction, and which locks the sprocket non-rotatably with this fitting. At the same time, an end of the rotary drive shaft on the side where the sprocket is mounted is engaged with a rotatable rotating means, and the rotary drive shaft is rotated with the rotation of the rotating means. It is characterized in that an engaging portion is formed which matches the circumferential direction of the engaging portion of the rotary drive shaft with the sprocket.

<Operation> The rotation means is engaged with the engagement portion of the rotation drive shaft, and the rotation drive shaft is rotated by the rotation means such that the engagement portion of the rotation drive shaft and the sprocket are aligned in the circumferential direction. As a result, the rotation drive shaft and the sprocket can be fitted to each other, and by fitting the rotation drive shaft and the sprocket to each other, the locking portion of the rotation drive shaft and the sprocket can be locked.

Embodiment An embodiment of the oil pump according to the present invention will be described in detail below with reference to the drawings. The same members as those of the conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, an embodiment of this oil pump
A fitting portion 18 to which a sprocket 17 is fitted is formed at an end portion of the rotary drive shaft 16 protruding to the right side of the drawing in FIG. Further, as shown in FIG. 2 which is an enlarged perspective view showing only the fitting portion 18, a locking for fixing the sprocket 17 to the fitting portion 18 in a non-rotatable manner. The part 21 is formed. At the right end of the fitting portion 18 in the figure, a rod-shaped adjusting member 31 is provided so as to be concentric with the rotary drive shaft 16 and integrally with the fitting portion 18. Further, a male screw portion 32 is formed on the outer peripheral surface of the adjusting member 31, and a rotating means such as a driver is engaged with and rotates the rotating means at the right end of the adjusting member 31 in the drawing. An engaging portion that can rotate the rotary drive shaft 16 by moving it, that is, a minus driver 33 in this embodiment.
An elongated rectangular groove 34 that can be engaged with is formed.

Therefore, on such a rotary drive shaft 16 of the oil pump 15,
The work of fitting the sprocket 17 around which the chain 20 is wound is performed as follows. That is, the crankshaft
The chain 20 is wound around the sprocket 19 fitted to 12, and the sprocket 17 fitted and held at the lower end side of the chain 20 in the figure is fitted to the rotary drive shaft 16 of the oil pump 15 already fixed. Insert into the part 18. On this occasion,
The engagement portion 21 formed in the fitting portion 18 and the engagement portion 21 formed in the fitting insertion hole 22 of the sprocket 17 overlap each other, so that the sprocket 17 can be inserted and fitted in the fitting portion 18, The fitting part
A slotted screwdriver 33 is engaged with and rotated in the groove 34 of the adjusting member 31 formed in 18. Thus the sprocket
The sprocket 17 is fixed to the fitting portion 18 by fitting the 17 into the fitting portion 18 of the oil pump 15 and screwing a nut (not shown) into the male screw portion 32 of the adjusting member 31.

In other words, the fitting portion 18 is provided with an engaging portion that engages with the rotating means such as the minus driver 33 on the protruding adjusting member 31, that is, the groove portion 34 is formed in the present embodiment. By engaging the driver 33 and rotating the fitting portion 18 together with the rotary drive shaft 16, the fitting portion 18 and the sprocket 17 are rotated.
It is possible to mount the sprocket 17 on the fitting portion 18 while superposing the respective locking portions 21 and 23 with each other very easily.

By the way, in this embodiment, the rotation drive shaft of the oil pump 15 is
An adjusting member 31 is projectingly provided on the fitting portion 18 of 16 and the adjusting member 31
The elongated rectangular groove 34 is formed at the end of the adjustment member 31.
The groove portion 34 may be formed at the end of the fitting portion 18 by omitting, and the shape of the groove portion 34 may be various other shapes according to the tip shapes of various rotating means such as the driver 33. Well, in short, it suffices that the end portion of the rotary drive shaft 16 on the side where the sprocket 17 is mounted has an engaging portion with which the rotating means such as the driver 33 can engage.

<Effect of the Invention> According to the oil pump of the present invention, an engaging portion that engages with the rotating means is formed at the end of the rotary drive shaft, and the rotating means is engaged with the engaging portion to drive the rotation. By rotating the shaft,
Since the circumferential direction of the engaging portion formed on the rotary drive shaft and the sprocket can be matched, the engaging portion of the rotary drive shaft and the sprocket can be engaged by fitting the rotary drive shaft and the sprocket. can do. For this reason, the sprocket with the chain already wound can be extremely easily fitted to the rotary drive shaft of the oil pump, and the work efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a wheel pump according to the present invention, and FIG. 2 is a perspective view of a main part of the embodiment.
FIG. 3 is a schematic sectional view of an example of a conventional oil pump, and FIG. 4 is a perspective view of a main part in this example. In the drawing, 11 is a cylinder block, 12 is a crankshaft, 14 is a lower case, 15 is an oil pump, 16 is a rotary drive shaft, 17, 19
Is a sprocket, 18 is a fitting part, 20 is a chain, 21 and 23 are locking parts, 22 is a fitting hole, 31 is an adjusting member, 32 is a male screw part, 33
Is a flathead screwdriver, and 34 is a groove.

Claims (1)

(57) [Scope of utility model registration request] 1. An oil pump rotatably driven through a chain by the rotation of a crankshaft of an engine, when the rotational drive shaft of the oil pump is aligned with the sprocket around which the chain is wound in the circumferential direction. The rotation drive shaft and the sprocket to each other, and a locking portion that locks the sprocket in a non-rotatable manner is formed along with the fitting, and the rotation on the side on which the sprocket is mounted. An end portion of the drive shaft is engaged with a rotatable rotating means, and the rotary drive shaft is rotated in accordance with the rotation of the rotary means, so that the locking portion of the rotary drive shaft and the sprocket. An oil pump is characterized in that an engagement portion is formed so as to match the circumferential direction with the oil pump.