KR100385262B1 - Lubricating device for crankshaft - Google Patents

Abstract

In the crankshaft with a centrifugal filter, this invention prevents the rolling surface misalignment of a bearing by the plate thickness tolerance of the filter plate which comprises a centrifugal filter. The inner race 22 of the ball bearing 12 is made into the web (3). The position in contact with the bearing contact portion 25 formed on the side surface of the backsheet), and the filter plate 11 between the ball bearing 12 and the base receiving portion 26 formed on the side surface of the web 3. A groove is formed to accommodate the base, which has a width d slightly wider than the plate thickness t of the base 20. The filter plate 11 forms a plate spring shape and protrudes on the coarse diameter end part 24 in the free state before contacting the base 20 with the ball bearing 12.

Description

Crankshaft Lubricator {Lubricating device for crankshaft}

TECHNICAL FIELD The present invention relates to a crankshaft with a centrifugal filter, and more particularly, to a bearing that can maintain bearing accuracy with high accuracy.

Fig. 3 shows the structure of the crankshaft with centrifugal filter described in laboratory 60-6577, wherein the crankshaft 1 consists of a journal 2, a web 3 and a crank pin 4, and a journal 2 ) And forming a forced flow passage consisting of flow passages 5 and 6 formed in the crankshaft 4 and flow passages 7 formed in the crank pins 4, forcibly supplying oil from the oil pump P, and forming the oil formed on the crank pins 4. The hole 4a is lubricated by the bearing portion 9 of the connecting rod 8 or the like.

In addition, a centrifugal filter 10 communicating with a forced flow path is formed between the side surface of the web 3 and the journal wall 14 facing the web 3, and a part of the wall portion forming the centrifugal filter 10 is formed in a substantially cone shape. It consists of the filter plate 11. The base 20 of the filter plate 11 is press-supported between the web 3 and the ball bearing 12, and the outer circumferential side end portion covers the opening of the flow path 7 and is provided on the outer circumferential side surface of the web 3. Closely The ball bearing 12 is pressed into both the outer circumferential surface of the journal 2 and the journal wall 14. In the drawing, reference numeral 13 denotes the bearing on the other side in which the web 3 is fitted, 15 cylinder block, 16 cylinder liner, and 17 piston.

As described above, in the form of fixing the base of the filter plate 11 between the web 3 and the ball bearing 12, the ball bearing 12 may be caused by variations in the plate thickness of the filter plate 11. The raceway gap of the will occur. The principle of the occurrence of this raceway cross is shown in FIG. FIG. 4 shows an enlarged support structure for the base of the filter plate 11, and FIG. 4A shows the case where the plate thickness of the filter plate 11 is thick and the case B of FIG. do.

That is, the ball bearing 12 consists of the outer race 21 press-fitted on the journal wall 14 side, the inner race 22 press-fitted on the journal 2, and the ball 23, and the When press-fitting the base 20 of the filter plate 11 between the bearing position regulating portion 3a and the inner race 22, the fixed position of the inner race 22 relative to the journal 2 is determined by the filter plate ( 11) is affected by the deviation of the plate thickness. On the other hand, the fixing position with respect to the journal wall 14 of the outer race 21 is constant.

Therefore, as shown in Fig. 4A, when the plate thickness of the filter plate 11 is thicker than the reference value, the inner race 22 is pushed in the direction of the arrow, that is, the right direction of the drawing, and the inner race 22 and the outer race A gap between the center lines is a between each center line, and this causes a raceway gap, which is a shift between raceways inside and outside the ball 23. On the other hand, even when the plate thickness is thinner than the reference value as shown in Fig. 4B, since the inner race 22 is pushed in the direction of the arrow, that is, to the left in the drawing, the inner race 22 and the outer race 21 As for the center line, each center line shifts | deviates like dimension b, but a raceway gap arises.

Therefore, in the support structure for the base 20 of the filter plate 11, in addition to the tolerance of the centrifugal filter 10 itself, the plate thickness tolerance of the filter plate 11 also adds up, and also the JIS standard of plate thickness Since the tolerance is set relatively large, it is difficult to maintain the transmission surface of the ball bearing 12 with high precision as long as the structure which fixes the base 20 of the filter plate 11 using the ball bearing 12 is employ | adopted. It became. However, the bearing of the crankshaft rotating at high speed is inherently required to maintain the transmission surface with high precision. Therefore, an object of the present invention is to provide a crankshaft lubrication apparatus capable of maintaining a high precision of a raceway of a bearing despite the formation of a centrifugal filter.

1 is an enlarged cross-sectional view of a crankshaft according to an embodiment;

2 is a partially enlarged sectional view showing a state before fixing the centrifugal filter plate;

3 is a sectional view showing a crankshaft portion of a conventional example;

Fig. 4 is an explanatory view of the principle of occurrence of raceway displacement of the bearing.

<Explanation of symbols for the main parts of the drawings>

1: crankshaft 2: journal

3: web 4: crank pin

5: Euro 6: Euro

7: Euro 9: connecting rod bearing

10 centrifugal filter 11 filter plate

12 ball bearing 14 journal wall

20: Donation 21: Outer Race

23 ball 25 bearing contact

26: donation unit

In order to solve the above problems, the crankshaft lubricator according to the present invention forms a centrifugal filter between the web side of the crankshaft and the journal wall facing the crankshaft to communicate with a forced flow path formed in the crankshaft, A crankshaft lubricator in which a base outer side of a filter plate forming a filter is brought into close contact with a bearing inner side of a crank shaft.

The inner circumferential portion of the bearing inner surface is brought into direct contact with the bearing contact portion formed on the web side, and the base of the filter plate is closer to the outer circumferential side than the bearing contact portion, and the base of the filter plate and the web side The clearance is formed between.

Hereinafter, an embodiment will be described based on the drawings. 1 is a view corresponding to FIG. 3 showing an enlarged bearing contact portion of the crankshaft, and FIG. 2 is a partially enlarged cross-sectional view showing a state before the filter plate is in close contact with the bearing. In addition, since this embodiment changes a support structure of a filter plate with respect to the said prior art example, since it uses a code | symbol in common, and abbreviate | omits description as a principle about parts other than a filter plate and a bearing structure, The description of the conventional example is used.

In Fig. 1, the ball bearing 12 presses the outer race 21 into the journal wall 14, while the inner race 22 is loosely supported on the coarse diameter end 24 formed on the journal 2; do. Positioning of this ball bearing 12 is performed by washer 30 and web 3 by fastening nut 33 to screw portion 32 at the shaft end via washer 30 and gear 31 on journal 2. It is done between the side of.

The filter plate 11 covers the open end of the flow path 7 and partitions the centrifugal filter 10 between the side of the web 3 and the journal wall 14 and the ball bearing 12 facing it. In addition, the detail of the filter plate 11 is mentioned later.

The ball bearing 13 of the journal 2 on which the web 3 is fitted and presses the outer race 34 into the journal wall 14, and the inner race 35 the coarse diameter of the journal 2. It press-fits on the edge part 37. Reference numeral 36 is a ball.

Fig. 2 shows the details of the filter plate 11 and its installation structure, wherein the filter plate 11 is made of a suitable metal having elasticity such as iron, and the center of the ball bearing 12 by an appropriate method such as press molding. It is formed so that it may become substantially cone shape which becomes convex in a direction.

The base 20 protrudes above the coarse diameter end portion 24 in a free state in which the base portion 20 is bent in a stepped manner and does not contact the ball bearing 12, and the inner race of the ball bearing 12 is formed at the coarse diameter end portion 24. In the attached state in which 22 is inserted, the inner surface of the ball bearing 12 is elastically deformed and pushed in the lateral direction of the web 3.

An annular recessed portion accommodating portion 26 is formed in a portion of the web 3 facing the inner surface of the inner race 22, and the base accommodating portion 26 and the inner surface of the inner race 22 are formed. The groove | channel which receives the base 20 is formed in between, and the base 20 pushed in by the inner surface of the inner race 22 is accommodated in this groove | channel.

The bearing contact part 25 is formed in the inner peripheral side rather than the base accommodating part 26 in the side surface of the web 3. The bearing contact portion 25 is formed by cutting as an annular recess formed at a position outside the base accommodating portion 26 toward the coarse diameter end portion 24 direction. The bearing contact part 25 is a part which positions the inner surface of the inner race 22 by direct contact.

The bearing contact portion 25 and the base receiving portion 26 are continuous in a stepped manner, and the distance between the bearing contact portion 25 and the base receiving portion 26 is that of the base receiving portion 26 and the inner portion accommodating the base 20. The width d of the groove formed between the race 22 is formed, and the width d is slightly larger than the plate thickness t of the filter plate 11. Therefore, when the base 20 enters into the groove formed between this base receiving part 26 and the inner race 22, a slight clearance will generate | occur | produce on the crank pin 4 side.

The outer circumferential portion of the filter plate 11 forms a curl portion 27 and is in close contact with the annular concave curved surface portion 28 formed on the lateral outer circumferential side of the web 3. Between the curl portion 27 and the annular concave curved portion 28, the inner race 22 of the ball bearing 12 becomes liquid-tight by elastically deforming the base 20 and pushing it to the web 3 side. The oil in the filter 10 is prevented from leaking.

The centrifugal filter 10 covered by the filter plate 11 communicates with the flow paths 6 and 7 and the crankshaft 1 rotates at high speed, so that the N impurity such as metal debris mixed in the oil is outwardly centrifugally. To be separated. The oil from which such impurities have been removed is sent from the centrifugal filter 10 to the flow path 7 and is further lubricated from the oil hole 4a to the bearing portion 9.

Next, the operation of the present embodiment will be described. In FIG. 2, the filter plate 11 is inserted over the journal 2 and covered on the side of the web 3, and then the journal 2 is mounted on a ball bearing 12 which is press-fitted to the journal wall 14 of the crankcase in advance. One end of the ball bearing 12, the inner race 22 of the ball bearing 12 is fitted on the coarse diameter end 24, and then the washer 30 and the gear 31 are inserted into the journal 2, and the shaft end The nut 33 to the screw portion 32.

In this way, the inner race 22 is in direct contact with the bearing contact portion 25 and is positioned and fixed between the washer 30 and the bearing contact portion 25. Moreover, the base 20 which protruded by the dimension (c) slightly from the bearing contact part 25 on the coarse diameter end part 24 in the state before inserting the inner race 22 into the inner race of the ball bearing 12 is carried out. (22) By contacting the inner surface, it is elastically deformed by the dimension (c) and pushed into the groove formed between the inner race 22 and the base receiving portion 26 of the ball bearing 12.

At this time, since the plate thickness t of the base 20 is smaller than the groove width d formed between the inner race 22 and the base accommodating portion 26, the base 20 is the base accommodating portion 26. Is accommodated with some clearance to. At the same time, the ball bearing 12 is brought into liquid contact with the self-resilient elasticity. At this time, the outer peripheral portion of the filter plate 11 is in close contact with the curl portion 27 in the concave curved portion 28, the filter plate 11 can hermetically seal the centrifugal filter 10.

Therefore, since the positioning of the inner race 22 is performed by direct contact with the bearing contact part 25 without interposing the base 20 as in the related art, the influence by the variation of the plate thickness of the filter plate 11 is excluded. The positioning of the inner race 22 can be determined by its own precision and the machining precision of the bearing contact portion 25. In addition, since the bearing contact portion 25 can be formed by cutting with high machining accuracy, the positioning of the inner race 22 can be accurately made, and the bearing precision of the ball bearing 12 can be prevented from being shifted, so that the bearing precision can be precisely adjusted. It can be maintained.

Moreover, since the filter plate 11 is made into a plate spring, and the base 20 is fixed while elastically deforming using the inner surface of the inner race 22, the base 20 is restrained by the restoring elasticity of the filter plate 11. To the inner surface of the inner race 22 in a liquid tight manner, and the curled portion 27 on the outer circumferential side can be in a liquid tight contact with the concave curved portion 28, and as a result, the centrifugal filter 10 is hermetically sealed. can do.

According to the present invention, the inner circumferential portion of the bearing inner surface is brought into direct contact with the bearing contact portion formed on the web side, and the base of the filter plate is brought closer to the bearing inner surface on the outer circumferential side than the bearing contact portion, and also between the web side. Since the clearance is formed in the bearing, positioning of the bearing is performed by the bearing contact portion of the web, so that the plate thickness of the base of the filter plate may not be involved in the positioning accuracy of the bearing. Therefore, even if the plate thickness of the filter plate is different, it does not affect the raceway of the bearing, and as a result, even if the centrifugal filter is formed adjacent to the bearing, the raceway of the bearing can be prevented and the raceway can be maintained with high accuracy.

In addition, when the filter plate is in the form of a plate spring, the base can be brought into close contact with the bearing by the self-resilience elasticity, so that the centrifugal filter, which is part of the forced flow path, can be covered with the filter plate.

Claims (2)

A centrifugal filter is provided between one side of the web of the crankshaft and the journal wall facing the crankshaft to communicate with a forced flow path formed in the crankshaft. In the crankshaft lubricator closely attached to the inner surface, The inner circumferential portion of the bearing inner surface is brought into direct contact with a bearing contact portion formed on the side of the web, thereby making the base of the filter plate closer to the outer circumferential side than the bearing contact portion, and the base of the filter plate and the web side. Crankshaft lubricator, characterized in that the clearance is formed between. 2. The crankshaft lubricator according to claim 1, wherein the filter plate is formed in a disc spring, and the base is brought into close contact with the bearing inner surface by self-healing elasticity.