JP4511402B2 - Stabilizer bush for vehicle - Google Patents

Description

  The present invention relates to a vehicle stabilizer bush, and more particularly to an improved structure of a vehicle stabilizer bush in which a stabilizer bar is inserted into an inner hole, and the stabilizer bar is elastically supported on a vehicle body.

  As is well known, a stabilizer bush used in a vehicle such as an automobile to improve steering stability, ride comfort, etc., is formed between an intermediate portion of a stabilizer bar that connects suspension arms on the left and right sides of the vehicle and a vehicle body. It is inserted between them to elastically support the stabilizer bar on the vehicle body, and is usually composed of a cylindrical rubber elastic body provided with an axially extending inner hole, and the stabilizer is provided in the inner hole. While the bar is inserted, the outer peripheral surface of the bar is attached to the body by an appropriate mounting bracket.

  By the way, in such a stabilizer bush, as is well known, when the stabilizer bar is twisted (rotated around its axis) under the condition that the stabilizer bar is inserted into the inner hole, When the torsional friction generated between the inner peripheral surface of the inner hole and the outer peripheral surface of the stabilizer bar is large, not only abnormal noise is generated but also the riding comfort performance is deteriorated.

  Therefore, conventionally, various structures for reducing torsional friction generated between the stabilizer bush and the stabilizer bar have been proposed. For example, in Patent Documents 1 and 2 below, the cylindrical rubber elastic body constituting the stabilizer bush is formed of self-lubricating rubber, thereby reducing the friction coefficient of the cylindrical rubber elastic body. A structure that reduces torsional friction between the two is clarified.

  Further, in Patent Document 3 below, a large number of small holes filled with grease are provided on the inner peripheral surface of the cylindrical rubber elastic body, and the outer peripheral surface of the stabilizer bar and the cylinder are rotated as the stabilizer bar is turned. Grease is supplied from the inside of each small hole between the inner peripheral surface of the rubber elastic body and a grease film is formed, whereby the stabilizer bar slides on the cylindrical rubber elastic body. A structure is disclosed in which the resistance is reduced, and thus the torsional friction between the stabilizer bar and the cylindrical rubber elastic body is reduced. Furthermore, since grease is accommodated in a large number of small holes provided on the inner peripheral surface of the cylindrical rubber elastic body, even if the stabilizer bar is repeatedly rotated, the grease is not separated from the stabilizer bar and the cylinder. As a result, it is said that the effect of reducing torsional friction can be stably maintained.

  However, according to the research by the present inventors, in order to further improve the riding comfort performance of the vehicle, the torsional friction in the stabilizer bush is further reduced and the effect of reducing the torsional friction is maintained for a longer period of time. It has been found that it is necessary to maintain a stable and stable structure. In addition, a cylindrical rubber elastic body is simply formed by self-lubricating rubber, or the inner peripheral surface of the cylindrical rubber elastic body is filled with grease. It was concluded that it is difficult to secure a sufficient reduction width of torsional friction to obtain a desired riding comfort performance simply by providing a large number of small holes.

JP-A-8-270728 Japanese Patent Laid-Open No. 10-60179 Japanese Utility Model Publication No. 6-67118

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the torsional friction generated between the stabilizer bar and the stabilizer bar is more sufficiently reduced. Improved stabilizer bushing that can reduce the torsional friction and maintain it stably over a longer period of time, so that noise generation prevention performance and riding comfort can be improved even more effectively. To provide a structure.

  And, as a result of earnest research to solve the above-mentioned problems, the present inventors have not only simply formed the cylindrical rubber elastic body with self-lubricating rubber, but also on the inner peripheral surface of the cylindrical rubber elastic body. The present inventors have found that the above-mentioned problem can be solved by providing a plurality of protrusions in a special form and allowing a lubricant to exist on such an inner peripheral surface. Then, the present invention has been completed by further specifying the shape and size of the plurality of protrusions provided on the inner peripheral surface of such a cylindrical rubber elastic body.

That is, this invention is comprised from the following invention.
(1) It has a cylindrical rubber elastic body provided with an axially extending inner hole, and a stabilizer bar is inserted into the inner hole of the cylindrical rubber elastic body, while the outer peripheral surface of the cylindrical rubber elastic body In the vehicle stabilizer bush for elastically supporting the stabilizer bar to the body by being attached to the body of the vehicle, the cylindrical rubber elastic body is formed of self-lubricating rubber, while the cylindrical rubber elastic body A plurality of first ridges extending continuously in the axial direction and a plurality of second ridges extending continuously across each of the plurality of first protrusions are integrally formed on the entire circumferential surface. A plurality of recesses surrounded by the first protrusion and the second protrusion, and a state in which a predetermined lubricant is accommodated in the multiple recesses. And including the respective surfaces of the plurality of first protrusions and the plurality of second protrusions. The inner peripheral surface of the tubular elastic body, perpendicular Rutotomoni allowed to exist a lubricant, each of the plurality of first protrusions and said plurality of second protrusions, with respect to the extending direction In the cross-sectional shape, the cylindrical rubber elastic body is formed in a triangular shape with the inner peripheral surface side as the base, and the adjacent ones of the plurality of first protrusions are connected to the first protrusions. While the inner peripheral surface portion where the ridge is not formed is continuously positioned, the second ridge is formed between adjacent ones of the plurality of second ridges. A cross section formed by the side surface of the first ridge and the side surface of the second ridge where the recess intersects each other, with the inner peripheral surface portion not being sandwiched between them being continuously positioned A stabilizer bush for a vehicle having an inner surface having a V-shape and formed .
(2) Each of the plurality of first protrusions and the plurality of second protrusions has a height in the range of 0.4 to 1.0 mm and a pitch in the range of 0.5 to 2.0 mm. the vehicle stabilizer bushing according to the above (1) having a.
(3) The plurality of first protrusions are provided on the entire inner peripheral surface of the cylindrical rubber elastic body so as to extend continuously in the axial direction in a spiral form. the vehicle stabilizer bushings push from according to (2).

  That is, in the vehicle stabilizer bush according to the present invention, a plurality of first protrusions extending continuously in the axial direction on the entire inner peripheral surface of the cylindrical rubber elastic body, and continuously intersecting with the first protrusions. A plurality of extending second protrusions are respectively formed, and in such a state that the surface area of the inner peripheral surface is advantageously increased, a lubricant is present on such an inner peripheral surface. . Therefore, the amount of the lubricant present on the inner peripheral surface is sufficiently larger than, for example, a case where a small number of holes provided on the inner peripheral surface are simply filled with a lubricant such as grease. More lubricant is interposed between the outer peripheral surface of the stabilizer bar inserted into the inner hole and the inner peripheral surface of the cylindrical rubber elastic body, thereby forming a cylindrical shape of the stabilizer bar. The sliding resistance against the rubber elastic body can be further reliably and stably reduced. Further, since the cylindrical rubber elastic body is formed of self-lubricating rubber, the friction coefficient of the cylindrical rubber elastic body can be advantageously reduced.

  Therefore, in such a stabilizer bush for a vehicle, when the rotation of the stabilizer bar inserted through the inner hole of the cylindrical rubber elastic body is caused by torsion, the cylindrical rubber elastic body and the stabilizer bar The torsional friction that occurs in between can be reliably reduced in a more sufficient amount.

  Moreover, in the vehicle stabilizer bush according to the present invention, a large number of recesses are formed on the inner peripheral surface of the cylindrical rubber elastic body and surrounded by the first protrusion and the second protrusion. In addition, since a large number of the recesses contain a part of the lubricant present on the inner peripheral surface of the cylindrical rubber elastic body, such a large number of the recesses can store the lubricant. It is made to function reliably as a part, and the retention of the lubricant on the inner peripheral surface of the cylindrical rubber elastic body is advantageously enhanced, whereby the inner peripheral surface of the cylindrical rubber elastic body and the outer peripheral surface of the stabilizer bar It can be effectively prevented that the lubricant interposed between the two leaks out of the space between the cylindrical rubber elastic body and the stabilizer bar as the stabilizer bar is turned by twisting. As a result, the effect of reducing the torsional friction generated between the cylindrical rubber elastic body and the stabilizer bar, which is obtained by the presence of the lubricant on the inner peripheral surface of the cylindrical rubber elastic body as described above, is longer. It can be maintained stably over time.

  Therefore, in the vehicle stabilizer bush according to the present invention as described above, the noise prevention performance and riding comfort performance can be further effectively improved.

  Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 schematically shows an automotive stabilizer bush for reference to understanding a vehicle stabilizer bush according to the present invention in a cross-sectional direction perpendicular to the axis in a state of being attached to the automobile. As is clear from FIG. 1, the stabilizer bush 10 is mounted on a stabilizer bar 12 of an automobile and elastically supports the stabilizer bar 12 with respect to the body 14 of the automobile. It has a main rubber elastic body 18 as a cylindrical rubber elastic body having a cylindrical shape and provided with a hole 16.

  More specifically, as shown in FIGS. 2 and 3, the main rubber elastic body 18 has a substantially ½ circumferential portion on the lower side of the outer periphery in an axially perpendicular cross section, while the outer peripheral The remaining upper half portion of the upper side has an inverted saddle shape or an inverted saddle-like outer peripheral shape that is substantially U-shaped. An upper surface of the main rubber elastic body 18 is integrally formed with a mountain-shaped protrusion 19 that protrudes a predetermined height and extends continuously in the axial direction. In addition, outer flange portions 20 and 20 each having a substantially U-shaped flat plate shape are integrally provided on the outer peripheral surface excluding the upper surface at both ends in the axial direction of the main rubber elastic body 18. Yes. Further, in the axially intermediate portion of the main rubber elastic body 18, the stepped portion 22 that is one step higher than the portion where the outer flange portion 20 is not formed on each of the axially opposite end portions on the outer peripheral surface excluding the upper surface. In addition, an engaging protrusion 24 that protrudes with a substantially semicircular cross section and continuously extends in the circumferential direction is integrally formed at the center of the step portion 22 in the axial direction.

  Further, in the main rubber elastic body 18, a slit portion 26 reaching the inner hole 16 is provided at one place on the circumference so as to extend over the entire length. Thereby, as indicated by a two-dot chain line in FIG. 2, the inner hole 16 can be rotated so as to expand toward the side with the portion on the opposite side to the cut portion 26 as the center.

Here, in particular, the main rubber elastic body 18 is made of self-lubricating rubber. As is well known, this self-lubricating rubber is made by adding a lubricant to a predetermined rubber base material, and the self-lubricating property is permanently secured by the leaching of the lubricant on the rubber surface. It is configured to obtain. That is, in the stabilizer bush 10 of the present form state, the main rubber elastic body 18, by being configured in such a self-lubricating rubber Thus, the inner peripheral surface of the inner hole 16, the lubricant from the inside rubber As a result, the friction coefficient of the inner peripheral surface is advantageously reduced.

  As such a self-lubricating rubber, any conventionally known rubber can be adopted. For example, as disclosed in Japanese Patent Laid-Open No. 63-179842, rubbers conventionally used as anti-vibration rubbers such as NR, BR, IR, SBR, CR, NBR, EPDM, IIR, and blended polymers thereof. A material (base rubber) that contains silicone oil as a lubricant, or a material that contains silicone oil in a thermosetting polyurethane elastomer as described in JP-A-1-255719, Alternatively, the known rubber material as disclosed in JP-A-8-270728 is made to contain an unsaturated fatty acid amide, and further as disclosed in JP-A-10-60179, A known rubber material containing a polyethylene glycol type surfactant is appropriately used. A.

Further, in the present form status, body inner peripheral surface entire of the inner hole 16 of the rubber elastic body 18, a plurality and a plurality of first protrusion 28 second protrusion 30 consisting of such as self-lubricating rubber of the Are integrally formed so as to cross each other and continuously extend in the axial direction.

  That is, as is clear from FIG. 4 showing a part of the inner peripheral surface of the main rubber elastic body 18 in an expanded manner and FIG. 5 showing the end face shape in the cross section, here, a plurality of first protrusions 28 are used. Are formed so as to extend continuously in a spiral manner in parallel to each other and in the axial direction of the main rubber elastic body 18 in a state where the main rubber elastic body 18 is positioned at a certain distance in the circumferential direction. That is, the plurality of first protrusions 28 are adjacent to each other in the circumferential direction and are positioned so as to sandwich the inner peripheral surface portion where the first protrusions 28 are not formed between the adjacent ones. It is provided. Each of the first protrusions 28 has a substantially U-shaped cross section perpendicular to the extending direction.

  Also, the second ridge 30 is similar to the first ridge 28 in that a plurality of ridges 30 are spaced apart from each other at a certain interval in the circumferential direction of the main rubber elastic body 18, that is, between those adjacent in the circumferential direction. Between them, the first protrusion 28 is not formed, and the inner peripheral surface portion is sandwiched between them so as to extend parallel to each other and spirally in the axial direction of the main rubber elastic body 18. Is formed. The direction in which the second protrusion 30 extends in a spiral manner is symmetric with respect to the extending direction of the first protrusion 28 with respect to the central axis of the main rubber elastic body 18. The first protrusion 28 extends in a crossing manner. Although not shown, the second ridge 30 also has a substantially U-shaped cross section perpendicular to the extending direction, which is the same as the cross section of the first ridge 28.

  Then, a plurality of first protrusions 28 and a plurality of second protrusions 30 are formed on the inner peripheral surface of the main rubber elastic body 18 so as to intersect with each other. A large number of recesses 32 that are surrounded by 28 and the second protrusion 30 are formed. That is, the recess 32 is formed by the respective side surfaces of the first protrusion 28 and the second protrusion 30 intersecting each other, and the inner peripheral surface portion of the rubber elastic body 18 positioned between the side surfaces. It has a rhombus shape in plan view and has a configured inner surface. Then, on the inner peripheral surface of the rubber elastic body 18, the opposite corners of the rhombus shape (intersection of the first protrusion 28 and the second protrusion 30) are arranged in the circumferential direction of the main rubber elastic body 18. Are arranged so as to be spirally arranged along the extending directions of the first protrusion 28 and the second protrusion 30 in a state where they are positioned adjacent to each other in the axial direction. .

  Note that the main rubber elastic body 18 provided with the plurality of first protrusions 28 and the plurality of second protrusions 30 on the inner peripheral surface has the first and second protrusions in the manufacturing process. It can be easily obtained by performing a vulcanization molding operation using a mold in which a core in which a concave groove corresponding to the strips 28 and 30 is provided on the outer peripheral surface is accommodated.

  A lubricant 34 is present on the inner peripheral surface of the main rubber elastic body 18 having such a configuration. The type of the lubricant 34 is not particularly limited. For example, a dry coat film containing fine particles or powder having lubricity such as silicone grease, fluorine grease, or molybdenum particles is appropriately used. Used for.

  Such a lubricant 34 is accommodated in a plurality of recesses 32 provided on the inner peripheral surface of the main rubber elastic body 18 at a predetermined depth, and the plurality of first protrusions 28 and the plurality of first protrusions 28 and the plurality of recesses 32 are accommodated. For example, it is applied or coated so as to cover the entire surface of each of the second protrusions 30, and is present in a layered or film-like form on the entire inner peripheral surface of the main rubber elastic body 18. It is being crushed.

Thus, in this form status, body inner peripheral surface entire of the rubber elastic body 18, by a plurality of first projections 28 and a plurality of second protrusions 30 are integrally formed, the inner circumferential surface The surface area of the inner peripheral surface is sufficiently large as compared with the case where is a smooth cylindrical surface. Since the lubricant 34 is present on the entire inner peripheral surface having such a large surface area, the amount of the lubricant 34 existing on the inner peripheral surface is advantageously increased. In addition, a large number of recesses 32 are provided on the inner peripheral surface of the main rubber elastic body 18, and the lubricant 34 is accommodated in each of the recesses 32. This effectively functions as a reservoir for the lubricant 34, and the retention of the lubricant 34 is effectively enhanced.

In order to secure such an excellent feature, the height of each of the first protrusion 28 and the second protrusion 30 (the dimension indicated by h _{1 in} FIG. 5) is 0.1. It is desirable that the size is in the range of -1.0 mm, and each pitch (the dimension indicated by P _{1 in} FIG. 5) is a value in the range of 0.5-2.0 mm. .

This is because when the height of each protrusion 28, 30: h ₁ is less than 0.1 mm, it is too low, so that the formation of each protrusion 28, 30 is difficult, and the recess 32 The depth becomes too small, and the amount of the lubricant 34 accommodated inside becomes extremely small. And if it becomes so, it cannot fully fulfill | perform the function as a storage part of the lubricant 34, As a result, the retainability of the lubricant 34 in the internal peripheral surface of the main body rubber elastic body 18 will become inadequate. is there. The height of each protrusion 28, 30: If h ₁ is higher height exceeding 1.0 mm, as will be described later, when the stabilizer bar 12 to be inserted into the bore 16 has been caused to rotate by a torsion In addition, not only is the wear of the protrusions 28 and 30 more prominent, but, for example, when the lubricant 34 is applied to the inner peripheral surface of the main rubber elastic body 18 to be present, the protrusions 28 and 30 are provided. This is because the lubricant 34 may be left uncoated on the side surfaces 28 and 30.

On the other hand, when the pitch: P ₁ of each ridge 28, 30 is less than 0.5 mm, each recess 32 becomes smaller. Therefore, the height: h ₁ of each ridge 28, 30 is 0.1 mm. As in the case of the lower limit, the amount of the lubricant 34 accommodated in each recess 32 is extremely reduced. As a result, there is a problem that the retaining property of the lubricant 34 on the inner peripheral surface of the main rubber elastic body 18 becomes insufficient. The pitch of the ridges 28, 30: If P ₁ exceeds 2.0mm, the number of first and second protrusions 28, 30 formed on the inner peripheral surface becomes too small, their impact There arises a problem that the effect of increasing the amount of the lubricant 34 accompanying the increase in the surface area of the inner peripheral surface obtained by forming the strips 28 and 30 cannot be sufficiently obtained.

  Thus, as shown in FIG. 1, the main rubber elastic body 18 having such a structure is assembled to the bracket 36 with the stabilizer bar 12 inserted into the inner hole 16, and The bracket 36 is attached to the body 14 of the automobile through the bracket 36. As a result, the stabilizer bar 12 is supported to be vibration-proof with respect to the body 14 via the stabilizer bush 10.

  Here, as shown by a two-dot chain line in FIG. 2, the main rubber elastic body 18 expands the inner hole 16 toward the side centering on the portion opposite to the cut portion 26. Thus, the stabilizer bar 12 can be easily inserted into the inner hole 16. Further, in a state where the main rubber elastic body 18 is attached to the body 14 via the bracket 36, the outer flange portions 20 respectively provided at both end portions in the axial direction of the main rubber elastic body 18 are opposed to each other. In FIG. 5, the angled protrusions 19 provided on the upper surface of the main rubber elastic body 18 and the stepped portions provided at the axially intermediate portion are respectively brought into contact with and engaged with both end surfaces of the bracket 36 in the axial direction. 22 is compressed (crushed) between the surface of the body 14 and the inner surface of the bracket 36, and the engagement protrusion 24 is fitted into an engagement recess 38 provided in the bracket 36. ing. This prevents the main rubber elastic body 18 from coming off from the bracket 36 in the axial direction.

Thus, in the stabilizer bush 10 of the present form state, by the main rubber elastic body 18 is formed in a self-lubricating rubber, the friction coefficient of the elastic body 18 is sufficiently low, Further, the stabilizer bar 12 is inserted into the inner hole 16 of the main rubber elastic body 18 in a state where more lubricant 34 is present on the inner peripheral surface of the main rubber elastic body 18. Therefore, the sliding resistance of the stabilizer bar 12 with respect to the main rubber elastic body 18 is extremely effectively reduced. In addition, in addition to the fact that a large number of recesses 32 functioning as a reservoir for the lubricant 34 are provided on the inner peripheral surface of the main rubber elastic body 18, the retention of the lubricant 34 is advantageously enhanced. The lubricant 34 interposed between the outer peripheral surface of the stabilizer bar 12 and the inner peripheral surface of the main rubber elastic body 18 leaks to the outside as the stabilizer bar 12 and the main rubber elastic body 18 slide. Thus, the effect of reducing the sliding resistance of the stabilizer bar 12 with respect to the main rubber elastic body 18 can be stably maintained for a longer period of time.

  Therefore, in such a stabilizer bush 10, when the stabilizer bar 12 is twisted and rotated with respect to the main rubber elastic body 18, it is generated between the stabilizer bar 12 and the main rubber elastic body 18. The torsional friction can be reliably reduced in a sufficient amount, and the effect of reducing such torsional friction can be stably maintained for a longer period of time.

Therefore, in the stabilizer bush 10 of 如-out shape state nuclear, prevention performance and ride comfort of the abnormal noise is more than a fact that may be more effectively improved.

  Further, in the stabilizer bush 10, the plurality of first protrusions 28 and the plurality of second protrusions 30 provided on the inner peripheral surface of the main rubber elastic body 18 are between the adjacent ones. The first protrusion 28 and the second protrusion 30 are positioned so as to sandwich the inner peripheral surface portion, so that a large number of lubricants 34 can be stored on the inner peripheral surface. The recess 32 is constituted by the respective side surfaces of the first and second protrusions 28 and 30 intersecting each other, and the inner peripheral surface portion of the rubber elastic body 18 positioned between the side surfaces. It has an inner surface and is formed with a sufficiently large volume. Therefore, the capacity of the lubricant 34 in each recess 32 is also advantageously increased, so that the torsional friction generated between the stabilizer bar 12 and the main rubber elastic body 18 can be further sufficiently reduced. The effect obtained by this can be maintained for a longer period of time.

Further, in the stabilizer bush 10 of the present form states a number of recesses 32, on the inner circumferential surface of the rubber elastic body 18, the circumferential direction and the axis of the corner portions facing each other of the diamond-shaped elastic body 18 The stabilizer bars are arranged so as to be spirally arranged along the extending directions of the first protrusions 28 and the second protrusions 30 while being positioned adjacent to each other. When 12 is rotated with respect to the main rubber elastic body 18, the lubricant 34 in each recess 32 is collected at the corner of the recess 32 along the side surface of each protrusion 28, 30, for example. Then, the lubricant 34 can be passed over the corner and penetrated into another adjacent recess 32 to achieve a good flow state of the lubricant 34, thereby stabilizing the stabilizer bar 12 and the main rubber elastic body 18. Torsional flicker that occurs between Such effect ® emissions can further be made to more fully reduce also be expected.

  In the stabilizer bush 10, the first and second protrusions 28, 30 are formed so as to extend spirally in the axial direction with respect to the inner peripheral surface of the main rubber elastic body 18. For example, the first and second ridges 28 and 30 used for manufacturing the main rubber elastic body 18 are compared with the case where the ridges 28 and 30 are provided so as to extend parallel to the axial direction. Thus, it is easy to manufacture a mold having a molding surface for molding the main body rubber, and thus there is an advantage that the productivity of the main rubber elastic body 18 and thus the stabilizer bush 10 can be improved.

The specific configuration of the reference example that is easy to understand the present invention has been described in detail above, but this is merely an example, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. Can be added.

For example, the first protrusion 28 and the second protrusion 30 are formed in a plurality of first protrusions with respect to the inner peripheral surface of the main rubber elastic body 18, as shown in FIG. 28 is formed so as to extend continuously in parallel to the axial direction, while the plurality of second protrusions 30 are continuously parallel to the circumferential direction so as to intersect the plurality of first protrusions 28. However, in the present invention, as described later, a device as shown in FIG. 7 is added . Note that in FIG. 7 to FIG. 6 and described below, the members and portions that are the pre-Symbol form on purpose same configuration shown in FIGS. 1 to 5 are identified by the same reference numerals, and a detailed description thereof will be It has been omitted.

  Of course, one of the first protrusion 28 and the second protrusion 30 is formed so as to continuously extend in a spiral shape in the axial direction, and the other of them is formed as described above. Further, it may be formed so as to continuously extend in parallel to the axial direction or parallel to the circumferential direction.

  Further, the shapes of the first and second protrusions 28 and 30 are not particularly limited to those shown as examples. For example, the cross-sectional shape perpendicular to the extending direction may be a semicircular shape, a polygonal shape, or an indefinite shape. Even if it is made into a shape, there is no problem.

Under such circumstances, according to an embodiment of the stabilizer bushing according to the present invention, as shown in FIG. 7, each of the plurality of first projections 28 and a plurality of second ridges 30, the extending direction in perpendicular cross-sectional shape, there is a triangular shape with the base of the inner peripheral surface of the main rubber elastic body 18. Along with that, adjacent ones of the plurality of first protrusions 28 do not sandwich the inner peripheral surface portion of the main rubber elastic body 18 where the first protrusions 28 are not formed. Each first protrusion 28 is integrally formed on the inner peripheral surface of the main rubber elastic body 18 so as to be positioned continuously. On the other hand, adjacent ones of the plurality of second protrusions 30 sandwich the inner peripheral surface portion of the main rubber elastic body 18 where the second protrusions 30 are not formed. Each of the second protrusions 30 is integrally formed on the inner peripheral surface of the main rubber elastic body 18 so that the second protrusions 30 can be positioned continuously. And thereby, many recessed parts 32 are formed so that it may have the inner surface which exhibits the cross-sectional V character shape comprised by the side surface of the 1st protrusion 28 and the 2nd protrusion 30 which mutually cross | intersect. It has been done . Here, in FIG. 7, it should be understood that the lubricant 34 present on the inner peripheral surface of the main rubber elastic body 18 is omitted for convenience.

  According to such a structure, the main rubber elastic body 18 in a state where the first protrusion 28 and the second protrusion 30 ensure the size of the recess 32 as large as possible. It is possible to form a larger number on the inner peripheral surface of the. Thereby, the surface area of the inner peripheral surface of the main rubber elastic body 18 can be made larger, and the amount of the lubricant 34 to be present on the inner peripheral surface can be further advantageously increased. As a result, the torsional friction generated between the stabilizer bar 12 and the main rubber elastic body 18 can be more reliably reduced, and this is the ability to prevent the generation of abnormal noise in the automobile on which the stabilizer bush 10 is mounted. And can greatly contribute to the improvement of ride comfort performance.

In order to secure such excellent features, the heights of the first protrusion 28 and the second protrusion 30 each having a triangular cross section (indicated by h _{2 in} FIG. 7). dimension) is determined as a value within the range of 0.4 to 1.0 mm, and in each of the pitch (Figure 7 of the first and second protrusions 28, 30, dimension indicated by P ₂₎ is 0.5 It is desirable that the value be in the range of -2.0 mm.

Because the height of each protrusion 28, 30: If h ₂ is below 0.4mm, since too low, the volume of the recess 32 having a V-shaped section of the inner surface becomes too small, concave This is because the location 32 cannot sufficiently function as a reservoir for the lubricant 34, and as a result, the retainability of the lubricant 34 on the inner peripheral surface of the main rubber elastic body 18 becomes insufficient. is there. The height of each protrusion 28, 30: If h ₂ is higher height exceeding 1.0 mm, by the rotation of the stabilizer bar 12, as well as wear of the ribs 28 and 30 becomes more significant, For example, when the lubricant 34 is applied to the inner peripheral surface of the main rubber elastic body 18 so as to be present, the lubricant 34 may be left uncoated on the side surfaces of the protrusions 28 and 30. Because.

The pitch of the ridges 28, 30: Why preferable range of P ₂ is a 0.5~2.0mm, in the first embodiment, the first protrusion 28 having a U-shaped section When the pitch of the second protrusion 30: a preferred range of P ₁ is the same as the reason for a 0.5 to 2.0 mm.

The present invention, in addition to the automotive stabilizer bushing, for any stabilizer bushing of a vehicle other than an automobile, as well as it is applicable, of course.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view in the direction perpendicular to the axis showing one form of a stabilizer bush for reference to understanding a stabilizer bush according to the present invention in a state where the stabilizer bush is attached to a stabilizer bar and attached to a vehicle body. It is front explanatory drawing which shows the cylindrical rubber elastic body of the stabilizer bush shown by FIG. FIG. 3 is an explanatory view taken along the line III-III in FIG. 2. FIG. 3 is a partially enlarged cross-sectional explanatory view showing an expanded inner peripheral surface of the cylindrical rubber elastic body shown in FIG. 2. It is an end surface explanatory view in the VV section of FIG. Figure 4 shows another reference example of the scan Tabi riser bush is a view corresponding. It is a partial expansion perspective explanatory view shown in the state where the inner peripheral surface of the cylindrical rubber elastic body in one embodiment of the stabilizer bush according to the present invention was developed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stabilizer bush 12 Stabilizer bar 14 Body 16 Inner hole 18 Main body rubber elastic body 28 First protrusion 30 Second protrusion 32 Recess 34 Lubricant

Claims (3)

It has a cylindrical rubber elastic body provided with an axially extending inner hole, and a stabilizer bar is inserted into the inner hole of the cylindrical rubber elastic body, while the outer periphery of the cylindrical rubber elastic body In the vehicle stabilizer bush for elastically supporting the stabilizer bar on the body by being attached to the body,
While the cylindrical rubber elastic body is formed of self-lubricating rubber, a plurality of first protrusions extending continuously in the axial direction over the entire inner peripheral surface of the cylindrical rubber elastic body, A plurality of second protrusions that extend continuously across each of the one protrusion are integrally provided, and the first protrusion and the second protrusion surround the periphery. A plurality of recesses, and further including respective surfaces of the plurality of first protrusions and the plurality of second protrusions in a state where a predetermined lubricant is accommodated in the plurality of recesses. the inner circumferential surface of the cylindrical elastic body, Rutotomoni allowed to be present a lubricant,
Each of the plurality of first protrusions and the plurality of second protrusions has a triangular shape with the inner peripheral surface side of the cylindrical rubber elastic body as a base in a cross-sectional shape perpendicular to the extending direction. While the adjacent ones of the plurality of first protrusions are continuously positioned without interposing the inner peripheral surface portion where the first protrusions are not formed. The adjacent ones of the plurality of second protrusions are continuously positioned without interposing an inner peripheral surface portion where the second protrusions are not formed, and the recess Is formed to have an inner surface having a V-shaped cross section composed of a side surface of the first ridge and a side surface of the second ridge that intersect each other. Stabilizer bush. Each of the plurality of first protrusions and the plurality of second protrusions has a height in the range of 0.4 to 1.0 mm and a pitch in the range of 0.5 to 2.0 mm. The vehicle stabilizer bush according to claim 1 . Wherein the plurality of first protrusions are on the entire surface of the inner peripheral surface of the tubular elastic body, with a helical form, to claim 1 or claim 2 is provided so as to extend continuously in the axial direction The stabilizer bush for vehicles as described.

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