JP2009030666A - Split bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To temporarily assemble a split bearing into a bearing part irremovably by incorporating a groove-like integrating means using a rib of the outer ring even when a rolling bearing is used as the split bearing. <P>SOLUTION: This split bearing 20 divided into two parts is formed of a rolling bearing, and its outer ring 22 is provided with ribs at both side parts thereof in an axial direction. An integrating means is provided at a position within a range in the axial direction where this rib is formed. The integrating means includes an annular concave groove formed in the side surface of the rib, and a C-shaped ring is engaged with the concave groove, whereby the split outer ring pieces 22a, 22b of the outer ring 22 are integrated with each other in a temporarily assembled state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a split bearing. In particular, the present invention relates to a split bearing applied to a crank journal and a connecting rod large end of a crankshaft of an internal combustion engine (engine).

A crankshaft of an internal combustion engine mounted on a vehicle such as an automobile is usually formed as a crank-shaped integral type. The crank journal crank journal and the connecting end of the connecting rod at the large end cannot use an integral bearing because of the characteristics of the crank shape, and a split bearing divided into two in the circumferential direction is used.
Conventionally, a sliding bearing has been used as the split bearing. The sliding bearing formed as the split bearing is temporarily assembled and attached to the bearing portion of the crankshaft, and in this temporarily assembled state, conveyance or the like is performed to assemble the internal combustion engine. In this case, the sliding means of the split bearing is provided with an integration means so as not to be separated in a temporarily assembled state to the bearing portion of the crankshaft. This prevents the split bearings from being removed when transported from the temporarily assembled state to the crankshaft to the assembly location of the internal combustion engine.
As the integration means, for example, as shown in Patent Documents 1 and 2, etc., an annular groove is formed on the outer peripheral surface of the divided slide bearing across the divided portion, and a connecting member such as a retaining ring is formed in the groove. There is a configuration in which the two are integrated. As a result, the divided slide bearings are integrated in a state where they are temporarily assembled to the bearing portion of the crankshaft so that they do not come off during transportation or the like.
JP-A-6-81846 JP-A-6-109025

Recently, from the viewpoint of improving the performance of the internal combustion engine, such as fuel efficiency, it has been required to reduce the bearing resistance of the above-mentioned crankshaft bearing portion of the internal combustion engine as much as possible. It has been considered to use.
In the case of using this rolling bearing, if it is intended to be formed within the same width as the radial thickness of the conventional sliding bearing, the outer ring cannot be formed with a very large thickness. There is a problem that it is very difficult to apply to the outer ring.
That is, the rolling bearing includes an outer ring, an inner ring, a rolling element interposed between the inner and outer rings, and a holding inner ring that holds the rolling element as necessary. Even when the outer peripheral surface of the bearing portion is used as the inner ring, the constituent members of the outer ring and the rolling element are required. Accordingly, the thickness width for forming the outer ring is inevitably thinner than the thickness width of the conventional sliding bearing, and it is difficult to incorporate an integrated means for forming a groove or the like in this thin outer ring. Even if incorporated, it may affect the rolling performance.

In view of this, the present inventor has paid attention to a collar of an outer ring that can ensure the same level of thickness as a conventional sliding bearing as an outer ring of a rolling bearing.
Thus, the problem to be solved by the present invention is that, even when a rolling bearing is used as a split bearing, it is possible to incorporate a groove-shaped integration means using a flange of the outer ring, and the split bearing is It is to be able to be temporarily assembled so as not to come off.

In order to achieve the above object, the split bearing according to the present invention takes the following means.
First, according to a first aspect of the present invention, an outer ring having flanges on both sides in the axial direction is formed by being divided into two in the circumferential direction, and the two divided outer rings are temporarily assembled to a shaft to be assembled. A split bearing provided with an outer ring having an integration means for making it into an integrated state, wherein the integration means is provided within an axial range position where a flange of the outer ring is formed.
According to the first aspect of the present invention, the integration means for integrating the outer ring divided into two is provided in the axial range range position of the flange formed thick in the radial direction. For this reason, even when the rolling bearing is a split bearing, the integration means can be easily and reliably incorporated without affecting the rolling performance of the rolling bearing itself, and the split bearing can be detached from the bearing portion. Can be temporarily assembled so that there is no.

Next, a second invention of the present invention is the split bearing according to the first invention, wherein the integration means forms an annular groove on the side surface of the collar of the outer ring, and the annular groove is engaged with the annular groove. A connecting member such as a C-shaped ring to be joined is engaged with the concave groove so that the outer ring divided in two is integrated.
According to the second aspect of the invention, the integration means is provided on the side surface of the outer ring collar. As a result, the outer peripheral surface of the outer ring is not subjected to any processing such as a groove, so that the outer ring can be accurately incorporated into the bearing portion. Further, since the integration means has a simple configuration of a groove shape and a connecting member such as a C-shaped ring that engages with the groove shape, it has high reliability.

Next, a third invention of the present invention is the split bearing according to the first invention, wherein the integration means is arranged around the outer peripheral surface of the collar portion straddling the two split positions of the outer ring. A concave groove is partially formed in the direction, and a split pin-shaped connecting member is inserted into the concave groove so that the outer ring divided in two is integrated.
According to the third aspect of the invention, the integration means is provided on the outer peripheral surface of the outer ring collar. Thereby, since the formation of the groove for mounting the integration means is the outer peripheral surface, the processing can be easily performed. Further, since the concave groove of the integration means is formed partially in the circumferential direction of the outer peripheral surface, the processing is less.

Next, a fourth invention of the present invention is any one of the split bearings described in the first to third inventions, wherein the shaft on which the outer ring is to be assembled is a crank journal or a connecting rod large in the crankshaft of the internal combustion engine. It is an end bearing part.
According to the fourth aspect of the invention, the split bearing can be suitably applied to the crank journal of the crankshaft of the internal combustion engine or the bearing portion of the connecting rod large end as in the prior art.

The divided bearing of the present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, since the integrated means of the split bearing is mounted on the flange of the outer ring, even if the rolling bearing is a split bearing, the rolling performance of the rolling bearing itself is improved. The integration means can be easily and reliably assembled without affecting the divided bearing, and the split bearing can be temporarily assembled so as not to be detached from the bearing portion.
Next, according to the second invention described above, since the means for integrating the split bearing is provided on the side surface of the flange, the outer peripheral surface of the outer ring can be flush with the outer ring. Incorporation into the bearing portion can be performed with high accuracy. In addition, since the integration means has a simple configuration of a connecting member having a concave groove and a split pin shape, the reliability is high.
Next, according to the above-described third invention, since the formation of the concave groove for mounting the integration means is the outer peripheral surface, it can be easily processed. Further, since the concave groove of the integration means is formed partially in the circumferential direction of the outer peripheral surface, there is an advantage that less processing is required.
Next, according to the fourth invention described above, the split bearing of the rolling bearing can be suitably applied to the crank journal of the crankshaft of the internal combustion engine or the large-end bearing portion of the connecting rod.

Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings. The split bearing of this embodiment is a roller bearing in the form of a needle roller bearing, and is applied to a crank journal of a crankshaft of an internal combustion engine (engine) or a bearing portion at the connecting rod large end.
FIG. 1 shows a partial perspective view of a conventional crankshaft incorporated in an internal combustion engine. As shown in FIG. 1, the crankshaft 10 is integrally formed in a crank shape. The crankshaft 10 is rotatably supported on an internal combustion engine main body (not shown) via a rolling bearing 20. As the rolling bearing 20, a ring-shaped integral rolling bearing cannot be used because of the characteristic of the shape in which the crankshaft 10 is integrally formed in the crank shape, and a divided bearing having a structure divided into two in the circumferential direction is used. In FIG. 1, reference numeral 14 denotes a connecting rod large end bearing portion. Although not shown in the connecting rod large end bearing portion 14, a split bearing is used.

As the rolling bearing 20 used in the crank journal 12 of this embodiment, a needle roller bearing type is used. The roller bearing 20 of the needle roller bearing type includes an outer ring 22, a needle roller 30 as a rolling element, and a cage 32 that holds the needle roller 30. In this embodiment, the inner ring has a structure in which the outer peripheral surface of the crank journal 12 is assigned the function. However, an inner ring may be provided separately.
The outer ring 22 constituting the rolling bearing 20 and the cage 26 for holding the needle rollers 24 are divided into two in the circumferential direction. As will be described in detail later, the outer ring 22 has a hooked type.
In order to incorporate the crankshaft 10 into the main body of the internal combustion engine, a split bearing is assembled to the crank journal 12 or the connecting end 14 of the connecting rod, which is the bearing, and the outer ring is provided with an integration means. The split bearing 20 is prevented from being detached from the crankshaft 10 during conveyance for assembling the shaft 10. In FIG. 1, the integration means is not shown.

Next, a description will be given of a first embodiment of integration means for integrating the split bearings. 2 to 4 show the integration means of the first embodiment. 2 and 3 show the outer ring 22, FIG. 2 is a front view, and FIG. 3 is a side view. FIG. 4 shows a front view of the C-shaped ring 28 as a connecting member.
As well shown in FIG. 2, the outer ring 22 is provided with flanges 24 having a constant width on both sides in the axial direction (left-right direction as viewed in FIG. 2). The flange 24 is formed as a width dimension X and a radial thickness dimension Y on both sides. The thickness dimension Y is about twice as thin as the thickness of the central position where the cage for holding the needle rollers is disposed on the inner peripheral surface.
Further, the outer ring 22 is formed by being divided into two in the circumferential direction, and includes an upper upper outer ring 22a and a lower lower outer ring 22b as viewed in FIGS. The division position of the two divisions is a position separated by approximately 180 degrees, and the shape of the division surface 36 is a V shape as well shown in FIG. This is because the axial positioning is reliably performed when the upper outer ring and the lower outer ring are integrated.
The integration means of the first embodiment is provided on the side surface of the flange 24. More specifically, it is provided on the left side surface of the left ridge 24 as seen in FIG. An annular groove 26 is formed on this side as well shown in FIG. The depth of the groove 26 is smaller than the width dimension X of the flange 24 described above.

Corresponding to the annular concave groove 26, a C-shaped ring 28 as a connecting member shown in FIG. 4 is prepared. The C-shaped ring 28 is made of an elastic body made of resin and can be elastically deformed. The C-shaped ring 28 has a ring shape slightly smaller in diameter than the annular shape of the annular groove 26, and the upper and lower outer rings 22 a and 22 b divided into two when being engaged with the groove 26 are integrated by elastic deformation force. It acts to keep it in a state.
The cage 32 that holds the needle rollers is also divided into two parts corresponding to the outer ring 22 divided into two parts.

Next, an operation procedure for assembling and assembling the split bearing 20 in the above-described first embodiment integrally with the crank journal 12 of the crankshaft 10 will be described.
In this embodiment, the outer peripheral surface of the crank journal 12 is formed in advance so as to have the function of an inner ring. Therefore, a two-divided cage 32 holding the needle roller 30 on the crank journal 12 is sandwiched between the crank journal 12. Directly arranged, and further arranged so as to sandwich the two upper and lower outer rings 22a, 22b from the outside. In this case, the cage 32 and the upper and lower outer rings 22a and 22b are sandwiched by the crank journal 12 together with the cage 32 divided in two holding the needle rollers 30 in advance inside the upper and lower outer rings 22a and 22b. You may arrange | position like this.
In any case, when the upper and lower outer rings 22a and 22b are disposed with the crank journal 12 interposed therebetween, the shape of the dividing surface 36 of the upper and lower outer rings 22a and 22b is V-shaped. 22b are positioned and arranged in both the axial direction and the circumferential direction. For this reason, the annular groove 26 formed on the side surface of the flange 24 is also aligned in the axial direction and the circumferential direction. In this state, a C-shaped ring 28 as a connecting member is fitted into the annular concave groove 26 and engaged and locked. As a result, the upper and lower outer rings 22a and 22b are held in an integrated state by the elastic force of the C-shaped ring 28 to reduce the diameter and are temporarily assembled.
In this case, if the engagement state of the C-shaped ring 28 with the annular concave groove 26 is in the engagement state across at least one split surface of the upper and lower outer rings 22a and 22b divided into two, the upper and lower outer rings 22a and 22b. Can be held in an integrated state by the holding action of the C-shaped ring 28. In addition, if the C-shaped ring 28 is in the engaged state across both the divided surfaces, the holding action is more reliably performed.
As described above, the upper and lower outer rings 22a and 22b divided into two parts are temporarily assembled and attached to the crank journal 12 of the crankshaft 10 in an integrated state. For this reason, even if it conveys in order to incorporate the split bearing 20 in the main-body part of an internal combustion engine in the state attached to the crankshaft 10, it does not remove | deviate.

According to the integration means of the first embodiment described above, the annular concave groove 26 as the integration means is formed of a flange 24 that can be formed to have a thickness substantially the same as the radial thickness of a conventional slide bearing. Since it is provided on the side surface, even when the rolling bearing is the split bearing 20, it can be easily formed without affecting the rolling performance of the rolling bearing itself.
Further, according to the first embodiment, since the integration means is provided on the side surface of the flange 24, the outer peripheral surface of the outer ring can be flush with the outer ring bearing portion. Integration can be performed with high accuracy. Furthermore, since the integration means has a simple configuration of the concave groove 26 and the C-shaped link 28, the reliability is high.

Next, a description will be given of a second embodiment of the integration means for integrating the split bearings. 5 to 7 show the integration means of the second embodiment. 5 and 6 show the outer ring 22, FIG. 5 is a front view, and FIG. 6 is a side view. FIG. 7 shows a front view of the split pin 29 as a connecting member. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 5, the integration means of the second embodiment is formed by notching a groove 27 in a straight line on the outer peripheral surface of the flange 24 on both sides of the outer ring 22. The concave groove 27 is formed in a part of the outer peripheral surface in the circumferential direction, and is formed across the V-shaped dividing surface 36 of the upper and lower outer rings 22a and 22b. In this embodiment, the concave groove 27 is formed only on the left dividing surface 36 as viewed in FIG. 6, and the concave groove 27 is provided at two locations on the outer peripheral surface of the left and right flanges 24 as shown in FIG. Is provided. The axial position where the concave groove 27 is formed is within the range of the width dimension X where the flange 24 is formed.

Corresponding to the concave groove 26, a split pin 29 as a connecting member shown in FIG. 7 is prepared. The split pin 29 is formed of an elastic body made of resin, and is formed to be larger than the groove width of the concave groove 27 in a free state, and is elastically deformed to reduce the diameter so as to be fitted into the concave groove 27 and inserted. . In the inserted state, the split pin 29 is completely immersed in the concave groove 27, and does not protrude from the outer peripheral surface of the outer ring 22.
The split bearing 20 divided into two is held in an integrated state by inserting a split pin 29 as a connecting member into a concave groove 27 formed across the split surface 36 by elastic deformation.
The work procedure for assembling and assembling the split bearing 20 in the case of the second embodiment integrally with the crank journal 12 of the crankshaft 10 is the same as in the case of the first embodiment described above, although the configuration of the integration means is different. Is called. That is, although there is a difference between engaging the C-shaped ring 28 in the annular groove 26 or inserting the split pin 29 in the groove 27 partially formed on the outer peripheral surface, the same is performed. .

  Since the integration means of the second embodiment described above is also formed on the ridge 4 that is formed to be relatively thick, the concave groove 29 as the integration means can be easily formed. In addition, since the concave groove 29 of this 2nd Example is formed in an outer peripheral surface, the process can be performed easily. Further, since the concave groove 29 of the integrating means is formed partially in the circumferential direction of the outer peripheral surface, there is also an advantage that less processing is required.

As mentioned above, although one Example of this invention was described, this invention can consider various other embodiment.
For example, in the first embodiment of the integration means described above, the case where the annular groove 26 for forming the integration means is formed only on one side of the ridges on both sides has been described. It is good also as a structure which forms this ditch | groove. In this case, the divided rolling bearings can be integrated more reliably.
Further, in the second embodiment of the integration means described above, a case where a total of two concave grooves 27 for forming the integration means are formed corresponding to the flanges 24 on both sides of one dividing surface 36. As described above, the integrated holding action can be performed if it is formed at either one of the locations. On the contrary, it may be provided on all of the left and right dividing surfaces 36, and when all are provided, the holding action is more reliably performed.

1 is a perspective view partially showing a crankshaft to which a split bearing according to the present invention is applied. It is a front view which shows the outer ring | wheel of the integration means of 1st Example. It is a side view which shows the same outer ring. It is a front view which shows the C-shaped ring of the integration means of 1st Example. It is a front view which shows the outer ring | wheel of the integration means of 2nd Example. It is a side view which shows the same outer ring. It is a front view which shows the cotter pin of the integration means of 1st Example.

Explanation of symbols

10 Crankshaft 12 Crank Journal 14 Connecting Rod Large End Bearing 20 Rolling Bearing (Split Bearing)
22 outer ring 22a upper outer ring 22b lower outer ring 24 鍔 26 concave groove 27 concave groove 28 C-shaped ring (connection member)
29 Split pin (connecting member)
30 Needle rollers (rolling elements)
32 Cage 36 Split surface

Claims (4)

An outer ring having ridges on both sides in the axial direction is formed by dividing the outer ring into two in the circumferential direction, and an integration means for integrating the two divided outer rings into a shaft to be assembled to the shaft to be assembled to the outer ring. A split bearing with
2. The split bearing according to claim 1, wherein the integration means is provided in an axial range position where a collar of the outer ring is formed. The split bearing according to claim 1,
The integration means is divided into two by forming an annular groove on the side surface of the collar of the outer ring and engaging a connecting member such as a C-shaped ring that engages with the annular groove in the groove. A split bearing in which the outer ring is integrated. The split bearing according to claim 1,
The integration means forms a concave groove partially in the circumferential direction on the outer peripheral surface of the flange position across the split position of the outer ring divided into two, and a connecting member such as a split pin shape is formed in the concave groove. A split bearing characterized in that an outer ring split into two by insertion is integrated. The split bearing according to any one of claims 1 to 3,
2. A split bearing according to claim 1, wherein the shaft to which the outer ring is to be assembled is a crank journal of a crankshaft of an internal combustion engine or a bearing portion of a connecting rod large end.

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