JP2008267551A - Cylinder housing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem possibly caused by continuously integrating a tank body in a cylinder body as much as possible. <P>SOLUTION: This cylinder housing has a cylinder body 1 forming a single tube type buffer body, a tank body 2 the inside of which is in communication with the inside of the cylinder body 1, and a connecting part 4 to continuously integrate the tank body 2 in the cylinder body 1. On the other hand, this cylinder housing has a reinforcement part 6 continuously integrated on the periphery of the cylinder body 1 and the tank body 2 so as to fill up a hollow part 5 appearing on the periphery of the cylinder body 1 and the tank body 2 by formation of the connecting part 4, and a missing part 7 to make the thickness of the reinforcement part 6 equal or almost equal to the thickness of either one of the cylinder body 1 or the tank body 2 on the inner periphery of the tank part 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylinder housing, and more particularly to an improvement in a cylinder housing that forms a hydraulic shock absorber that is mounted on the rear wheel side of a motorcycle and absorbs road surface vibrations that are input to the rear wheel of the motorcycle.

  There have been various proposals for a hydraulic shock absorber that is mounted on the rear wheel side of a motorcycle and absorbs road surface vibrations that are input to the rear wheel of the motorcycle. Discloses a proposal that a so-called external tank body is integrally connected to the shock absorber body.

  That is, in the hydraulic shock absorber disclosed in Patent Document 1, the shock absorber body is formed in a single cylinder type, and an external tank body is integrated with the bottom portion of the cylinder body forming the shock absorber body. To connect to.

  At this time, in the hydraulic shock absorber described above, the cylinder housing forming the cylinder body in the shock absorber body is integrally provided with a bracket portion at a portion corresponding to the bottom portion of the cylinder body, and the tank body is attached to the bracket portion. It is going to be connected.

  Incidentally, the bracket portion is a valve housing, and a damping force generating portion is accommodated in the valve housing. The damping force generating portion is a shock absorber main body in which the piston body moves up and down in the cylinder body. The hydraulic oil is allowed to reciprocate with the tank body during the expansion / contraction operation, and has a predetermined damping action.

Therefore, according to the hydraulic shock absorber disclosed in Patent Document 1 described above, since the tank body is integrally connected to the shock absorber body, this hydraulic shock absorber is mounted on the rear wheel side of the motorcycle. When compared with the case where the tank body is connected to the shock absorber main body by a hose body, so-called mountability is improved.
Japanese Patent Laid-Open No. 11-311288 (see paragraph 0003 and FIG. 3 in the specification)

  However, in the proposal disclosed in the above-mentioned Patent Document 1, there is no problem in improving the mountability when mounting the hydraulic shock absorber on the rear wheel side of the motorcycle. It may be pointed out that there is a slight problem in expecting a favorable heat dissipation effect in the main body.

  That is, the heat dissipation in the hydraulic shock absorber having this type of tank body is not only the heat dissipation of the cylinder body itself, but in addition to this, the tank body through the bracket portion of the cylinder housing forming the cylinder body The heat dissipation in this will also affect its efficiency.

  Nevertheless, in the hydraulic shock absorber described above, the tank body is connected to the cylinder body via the bracket portion, that is, the tank body is in a state of being separated from the cylinder body. It may be pointed out that a favorable result cannot be obtained when the heat radiation area is reduced and viewed as a heat radiation effect in a hydraulic shock absorber.

  Therefore, in a hydraulic shock absorber having this type of tank body, in order to improve the heat dissipation effect in the hydraulic shock absorber, it can be proposed that the tank body is integrally connected to the cylinder body. When the tank body is integrally connected to the cylinder body, it may be pointed out that various problems occur.

  The present invention was devised in view of such a current situation, and an object of the present invention is to cause problems that may be caused by integrally connecting a tank body to a cylinder body. The present invention provides a cylinder housing that is suitable for use in a hydraulic shock absorber having a tank body and is optimal for expecting an improvement in versatility of the hydraulic shock absorber as much as possible.

  In order to achieve the above object, the structure of the cylinder housing according to the present invention basically includes a cylinder body that forms a single-cylinder shock absorber body, and a tank body that communicates with the inside of the cylinder body. The cylinder body and the tank body have a connecting portion integrally connected to the cylinder body and the outer periphery of the cylinder body and the tank body so as to fill the valleys exposed on the outer periphery of the cylinder body and the tank body by forming the connecting portion. It has a reinforcing part that is integrally connected, and has a missing part on the inner periphery of the tank body that makes the thickness of the reinforcing part the same or almost the same as the thickness of either the cylinder body or the tank body. Suppose.

  Therefore, in the present invention, the cylinder housing that forms the cylinder body in the single-cylinder shock absorber main body has a connecting portion, and the tank body is integrally connected to the cylinder body. Compared to the case where the cylinder body is separated from the cylinder body, the occupied volume at the time of attachment to the vehicle body can be made smaller. For example, a hydraulic shock absorber having a tank body is used as the rear of the motorcycle. The tank body can receive heat from the cylinder body directly and dissipate heat as well as improve the mountability when it is mounted on the wheel side. Can be obtained.

  And in this invention, the reinforcement part integrally connected by the outer periphery of a cylinder body and a tank body so that the trough part exposed to the outer periphery of a cylinder body and a tank body may be filled by formation of said connection part. Since it has, the mechanical strength which maintains the connection state of a cylinder body and a tank body is ensured.

  Further, in the present invention, the inner portion of the tank body has a missing portion that makes the thickness of the reinforcing portion the same as or substantially the same as the thickness of either the cylinder body or the tank body. Therefore, the so-called thick-walled portion disappears, and it is possible to prevent the occurrence of a nest that becomes a fragile portion, as well as to prevent the undesirably increased overall weight, and the inner volume in the tank body Can be increased.

  As a result, according to the present invention, it is suitable for use in a hydraulic shock absorber having a tank body, and is optimal for expecting improvement in versatility of the hydraulic shock absorber.

  Hereinafter, the present invention will be described based on the illustrated embodiment. A cylinder housing according to the present invention absorbs road surface vibrations that are mounted on the rear wheel side of a motorcycle and input to the rear wheel of the motorcycle. It is supposed to be used when forming a hydraulic shock absorber.

  As shown in FIG. 1, the cylinder housing according to the present invention includes a cylinder body 1 that forms a single-cylinder shock absorber body, and a tank body 2 that communicates with the inside of the cylinder body 1. In the figure, the valve housing 3 is formed integrally so as to be bridged between the cylinder body 1 and the tank body 2, that is, to be bridged between the bottom portions 1a and 2a of both.

  By the way, the hydraulic shock absorber formed using this cylinder housing is, for example, called a rear cushion unit and is mounted at the center on the rear wheel side of the motorcycle. The rod body (not shown) inserted into the cylinder body 1 so as to be able to project and retract is connected to the vehicle body side as a lower end side member and is set to a so-called inverted type connected to the wheel side as a lower end side member. However, if the present invention intends, it is a matter of course that the hydraulic shock absorber formed using this cylinder housing may be set upright upside down.

  Even in this hydraulic shock absorber, although not shown, a suspension spring is interposed, and the shock absorber main body extends in the direction in which the rod body 2 protrudes from the cylinder body 1 by the urging force of the suspension spring. In addition, the connecting position of the lower end of the suspension spring with respect to the cylinder body 1 is variable in the vertical direction that is the axial direction of the cylinder body 1.

  Therefore, in the illustrated cylinder housing, the so-called body portion of the cylinder body 1 has a built-up portion 1b that is thicker than the other portions. Although not shown, for example, it is disclosed in Patent Document 1 described above. As described above, a thread is formed in the build-up portion 1b in the shape of a ring nut so as to allow a spring receiver that carries the lower end of the suspension spring to be screwed by post-processing.

  Further, even in this hydraulic shock absorber, although not shown, a piston body is slidably accommodated in the cylinder body 1, and a rod side chamber and a piston side chamber are defined in the cylinder body 1 by the piston body. The rod side chamber and the piston side chamber communicate with each other via a damping valve disposed in the piston body, and the piston side chamber communicates with a tank body 2 described later.

  Although not shown, a female thread is formed on the inner periphery of the opening end 1c, which is the upper end in the drawing of the cylinder body 1, and a bearing member for the female thread, that is, an axial core A bearing member that closes the upper end opening of the cylinder body 1 is screwed together while passing the rod body through the portion.

  On the other hand, the tank body 2 has a so-called surplus inflow of hydraulic oil in the cylinder body 1 during the expansion and contraction operation in which the piston body moves up and down in the cylinder body 1, as is the case with the tank body 2 of almost all kinds. In addition, it is assumed that the so-called shortage of hydraulic oil can be discharged in the cylinder body 1.

  Although not shown, this tank body 2 has an oil-liquid chamber that stores hydraulic oil and a gas chamber that generates a rod reaction force, as is the case with this type of tank body 2 as described above. In many cases, so-called external replenishment is possible for the gas pressure in the gas chamber.

  For example, as disclosed in Patent Document 1 described above, the valve housing 3 is subjected to a hole punching process, and a damping force generating portion (not shown) is accommodated inside the hole. The damping force generator allows the hydraulic oil to reciprocate between the cylinder body 1 and the tank body 2 during the expansion and contraction operation of the shock absorber body in which the piston body moves up and down in the cylinder body 1. It is supposed to work.

  At this time, as shown in the drawing, the valve housing 3 is integrally formed so as to be bridged between the bottom portion 1a of the cylinder body 1 and the bottom portion 2a of the tank body 2, but is set in this way. Thus, as compared with a case where the valve housing 3 is formed in a mode in which the valve housing 3 is integrally connected to the bottom portion 1a of the cylinder body 1 as disclosed in Patent Document 1, for example, This is advantageous in that a so-called material amount for forming the housing 3 can be reduced and the degree of protrusion of the valve housing 3 can be suppressed to be small.

  Incidentally, the cylinder housing according to the present invention is basically formed as described above. On the other hand, the present invention is characterized in that it is formed as follows.

  That is, in the cylinder housing according to the present invention, as shown in FIG. 2 (A), the cylinder body 1 has the connecting portion 4 for integrally connecting the tank body 2 to the cylinder body 1. As shown in FIG. 2 (B), the reinforcing portion 6 integrally connected to the outer peripheries of the cylinder body 1 and the tank body 2 so as to fill the valleys 5 exposed on the outer peripheries of the cylinder body 1 and the tank body 2. In addition, as shown in FIG. 2 (C), it is assumed that a missing portion 7 that makes the thickness of the reinforcing portion 6 the same as the thickness of the tank body 2 is provided on the inner periphery of the tank body 2.

  To explain a little, first, the connecting portion 4 has a configuration that is indispensable for integrally connecting the cylinder body 1 and the tank body 2, but that is why the connecting portion 4 is thickly thick. It is obvious that forming the cylinder housing is disadvantageous in terms of reducing the amount of material when forming the cylinder housing, or disadvantageous in terms of reducing the weight of the components after the operation.

  Therefore, when the cylinder body 1 and the tank body 2 are formed integrally, the minimum thickness of the connecting portion 4 is the same as or substantially the same as the thickness of either the cylinder body 1 or the tank body 2. Preferably it will be set.

  Incidentally, since the so-called internal pressure acts equally in the cylinder body 1 or in the tank body 2, the thickness of the connecting portion 4 is assumed to follow the thickness of either the cylinder body 1 or the tank body 2. Of course, the required durability will be guaranteed.

  Next, even if the cylinder body 1 and the tank body 2 are integrally connected by the connecting portion 4, the cylinder body 1 or the tank body 2 is kept in a fixed state, and an excessive external force acts on the other side. In such a case, for example, the experience side indicates that deformation or breakage occurs between the connecting portions 4 and the both.

  Therefore, in order to avoid the occurrence of deformation or breakage with the connecting portion 4 sandwiched as described above, it is assumed that the reinforcing portion 6 is formed between them, that is, the cylinder body is formed by forming the connecting portion 4. 1 and a reinforcing portion 6 integrally provided on the outer periphery of the tank body 2 is provided so as to fill the valley portion 5 exposed on the outer periphery of the tank body 2.

  And by providing this reinforcement part 6, it becomes possible to form the thick part which eliminates the appearance of the part which pinches | interposes the above-mentioned connection part 4, ie, the trough part 5, Therefore, the connection by this thick part field The part 4 can be reinforced.

  However, the formation of the thick portion that eliminates the appearance of the valley portion 5 forms a so-called thick portion, and as described above, the formation of the thick portion is the amount of material at the time of forming the cylinder housing. This is disadvantageous in terms of reduction of the weight, or disadvantageous in terms of weight reduction in the subsequent parts.

  Therefore, in the present invention, the missing portion 7 is formed on the inner periphery of the tank body 2 so that the thickness of the reinforcing portion 6 is the same as the thickness of the tank body 2. Since the thickness at 6 is reduced, this contributes to a reduction in the amount of material when forming this cylinder housing, and also contributes to a reduction in the weight of the parts after the dredging, and also increases the inner volume in the tank body 2. Will be able to.

  In the above description, it is assumed that the thickness left in the reinforcing portion 6 by the formation of the missing portion 7 is the same as the thickness of the tank body 2, but as described above, from the viewpoint of so-called internal pressure action. Further, the thickness remaining in the reinforcing portion 6 may be the same as the thickness of the cylinder body 1, and further, may be substantially the same as the thickness of either the cylinder body 1 or the tank body 2. Of course it is good.

  The cylinder housing according to the present invention is formed as described above. Further, it is preferable that the cylinder housing is cast from an aluminum material, and the axis line of the tank body 2 is aligned with the axis line of the cylinder body 1. It is good to be inclined.

  That is, first, when aluminum material is selected as the material for forming the cylinder housing, it contributes to reducing the weight of the cylinder housing and also makes it easier to cut compared to a harder material such as steel. It could be said that it would be advantageous.

  In addition, when casting is selected as a method for forming the cylinder housing, the cylinder housing can be formed at a lower cost than when the cylinder housing is formed by forging. It can be said that it will be advantageous.

  When the cylinder housing is cast from an aluminum material, when a so-called thick part is formed, there is a risk that a nest that is a fragile part may easily appear in the thick part. In this case, as described above, the thickness of the portion that becomes thick due to the formation of the reinforcing portion 6 is reduced by forming the missing portion 7 on the inner periphery of the tank body 2, and as a result, the thick portion is reduced. Since it does not appear more than necessary, it can be said that casting using an aluminum material as a raw material is preferable in consideration of the above-described weight reduction and workability.

  Next, in the cylinder housing according to the present invention, as shown in FIG. 1, the axis of the tank body 2 is inclined with respect to the axis of the cylinder body 1 even if it is slight. good.

  That is, in the cylinder housing according to the present invention, as described above, the minimum thickness of the connecting portion 4 for integrally connecting the tank body 2 to the cylinder body 1 is set to one of the cylinder body 1 and the tank body 2. It is preferable that the thickness is the same as or substantially the same as the thickness.

  This allows the minimum thickness of the connecting portion 4 to be arbitrary, that is, it cannot be thinner than the thickness of either the cylinder body 1 or the tank body 2, but in particular the cylinder body 1 or the tank body. In the case where the thickness is much thicker than any one of the thicknesses of 2, this leads to a problem due to the formation of the thick portion described above. Therefore, in order to avoid this, the cylinder body 1 or the tank body 2 It is preferable that the thickness is the same as or substantially the same as any one of the thicknesses.

  However, if that is the case, if the minimum thickness of the connecting portion 4 is maintained along the axial direction of the cylinder body 1 and the tank body 2, the axial line of the cylinder body 1 and the axial line of the tank body 2 are In particular, although not shown in the drawing, it is possible to avoid obstructing various operations such as machining of the internal thread and attachment of the cap member to the open end 2b as the upper end in the drawing of the tank body 2. There will be no.

  Not only the connecting portion 4 that integrally connects the tank body 2 to the cylinder body 1, the part that minimizes the thickness is one place, and the other parts are less than the minimum thickness. Since it is formed thick, it is possible to further ensure the connection state between the cylinder body 1 and the tank body 2.

  Therefore, in the present invention, the axis of the tank body 2 is inclined with respect to the axis of the cylinder 1, that is, the axis of the tank 2 is inclined away from the axis of the cylinder 1 as it goes to the upper end side. It can be said that it is good to do.

It is a front view which shows the cylinder housing by this invention in a partial cross section. It is sectional drawing of the cylinder housing shown in the XX line position in FIG. 1, (A) shows a basic structure, (B) shows an improved structure, (C) shows a final structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder body 2 Tank body 3 Valve housing 4 Connection part 5 Valley part 6 Reinforcement part 7 Missing part

Claims (5)

While having a cylinder body that forms a single-cylinder shock absorber body and a tank body that communicates with the inside of the cylinder body, the cylinder body has a connecting portion that integrally connects the tank body. It has a reinforcing part integrally connected to the outer periphery of the cylinder body and the tank body so as to fill the valleys exposed on the outer periphery of the cylinder body and the tank body, and the thickness of the reinforcing part is changed to the cylinder body or the tank. A cylinder housing characterized in that it has a missing portion on the inner periphery of the tank body that is the same or substantially the same as the thickness of one of the bodies. 2. The cylinder housing according to claim 1, wherein the minimum thickness of the connecting portion is the same as or substantially the same as the thickness of either the cylinder body or the tank body. A valve housing is integrally formed so as to be bridged between the cylinder body and the tank body, and a damping force generation part is accommodated in the valve housing, and the damping force generation part is disposed in the cylinder body. The cylinder housing according to claim 1, wherein the cylinder housing has a predetermined damping action by allowing the hydraulic oil to reciprocate between the tank body during expansion and contraction of the shock absorber body that moves up and down. The cylinder housing according to claim 1, wherein the cylinder housing is cast from an aluminum material. The cylinder housing according to claim 1, wherein the axis of the tank body is inclined with respect to the axis of the cylinder body.

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