JP4768462B2 - Rotary damper - Google Patents

Description

  The present invention relates to a rotary damper, and more particularly to an improvement of a vane type rotary damper suitable for use in a steering mechanism of a two-wheeled vehicle.

  For example, a steering mechanism in a motorcycle in recent years has a rotary damper, and the front wheel in a running motorcycle, for example, the acceleration of the front wheel caused by the motorcycle overcoming a road surface protrusion, etc. The proposal which suppresses a shake with a rotary damper is disclosed by patent document 1, for example.

  Incidentally, the rotary damper disclosed in Patent Document 1 is referred to as a vane type in which a vane is accommodated in a chamber formed in a substantially fan shape in the housing, and the base portion of the vane accommodated in the housing is the housing. The two oil chambers are defined in the housing while the main body of the vane is pivotably supported in the vane so as to be swingable in the housing. It is assumed that a predetermined damping force is generated in the damping portion through which the hydraulic oil passes when the hydraulic fluid flows into and out of the vane when the main body portion of the vane swings.

Therefore, in this rotary damper, for example, by connecting the housing to the handle side of the motorcycle and connecting the vane to the vehicle body side of the motorcycle, the head between the handle side and the vehicle body side of the motorcycle is provided. It becomes possible to suppress mutual oscillation through the pipe.
JP-A-2001-99208 (paragraphs 0002, 0007, 0008, 0009, 0028, FIGS. 1 and 5 in the specification)

  However, the rotary damper disclosed in Patent Document 1 described above exhibits its original function of suppressing mutual swinging between the handle side and the vehicle body side of the motorcycle via the head pipe. However, there is no special problem, but it may be pointed out that there is a risk that it will take time to assemble it.

  That is, the rotary damper disclosed in the above-mentioned Patent Document 1 is also the same, but in the rotary damper of the kind, the main body portion of the vane, that is, the vane that swings in the housing, has the sealing member. While the sealing performance between the housing and the housing is ensured by sliding contact with the housing, the base portion of the vane pivotally supported by the housing with the output shaft penetrating the shaft core portion while continuously connecting the main body portion, The axial end face, that is, the front end face facing the inner surface of the housing is slidably contacted with a thrust washer disposed between the housing while having a seal member, thereby ensuring slidability with respect to the housing. Sometimes.

  At this time, the thrust washer has an outer diameter that is the same as the outer diameter of the base portion of the vane and has a hole that penetrates the pivot portion that is the tip portion of the output shaft that penetrates the shaft core portion of the base portion of the vane at the center portion. It is said to have.

  Therefore, when the pivot portion of the output shaft passing through the base portion of the vane passes through the central hole of the thrust washer and is fitted into the pivot portion formed in the housing, the thrust washer is arranged at a predetermined position. It is important not to move.

  Nevertheless, the predetermined position, which is the part where the thrust washer is disposed in the housing, has a circumferential portion having the same curvature as the circumferential surface as the side surface of the base portion of the vane, and a pair of extending portions extending tangentially from the circumferential portion. The thrust washer that has been dropped to the bottom of the housing is slid at the bottom and moved to a predetermined position, so the output shaft is attached to the base of the vane. The thrust washer may slide out from a predetermined position during assembly so as to penetrate the thrust washer while penetrating, and there is a concern that the assembly cannot be effectively performed.

  As a result, when connecting the output shaft penetrating the base portion of the vane to the housing, it is required to perform the work while considering that the thrust washer does not slide out of the predetermined position and move. Assembling takes time and there is a risk that productivity will be reduced.

  The present invention was devised in view of the above-described circumstances, and its purpose is not only to exhibit a predetermined damper function, but also to improve productivity without making the assembly work cumbersome. It is to provide a rotary damper that is optimal for expecting an improvement in its versatility without deteriorating.

In order to achieve the above-described object, the rotary damper according to the present invention basically has a configuration in which a vane of an accommodation is connected to a base portion pivotally supported in the housing so as to be swingable in the housing. The main body portion defines two oil chambers in the housing, and the two oil chambers allow the hydraulic oil to pass through when the hydraulic oil flows into and out of each other by swinging the main body portion. In the rotary damper in which a thrust washer formed in an annular shape is disposed between the axial end surface of the base portion of the vane and the inner surface of the housing, the thrust washer is positioned at a predetermined position in the housing. A pair of circumferential portions having the same curvature as the circumferential surface of the side surface of the base portion of the vane and a pair of tangentially extending from the circumferential portion. It formed substantially U-shape in plan view and a length portion, a stopper portion for preventing movement from the predetermined position in the thrust washer at least one extension comprising a pair is partially raised Suppose.

  Therefore, according to the present invention, when the output shaft that penetrates the base portion of the vane is pivotally supported by the housing, that is, the pivot portion that is the tip portion of the output shaft penetrates the central portion of the thrust washer. Then, the thrust washer cannot be moved from a predetermined position at the time of assembly to be fitted into the pivot portion which is a recess formed in the housing, so that the pivot portion of the output shaft is fitted into the pivot portion of the housing without being disturbed by the thrust washer. The assembly work can be performed quickly and reliably.

  As a result, according to the present invention, it is not necessary to unnecessarily work time when assembling the rotary damper, and the productivity of the rotary damper can be prevented from being lowered.

  In the following, the present invention will be described based on the illustrated embodiment. Even in the rotary damper according to the present invention, for example, it is disposed on the front wheel side in a motorcycle as a motorcycle, and the handle and the vehicle body in the motorcycle are arranged. It is used to suppress the mutual oscillation through the head pipe between the two.

  And even if it is in the rotary damper by this invention, when this is seen with the circuit diagram shown in FIG. 1, the right and left defined by the vane 2 accommodated in the chamber formed in the substantially fan shape in the housing 1 will be said. The two oil chambers R1 and R2 are formed.

  Incidentally, the vane 2 is in the housing 1, and as shown in FIG. 2 and FIG. 3, the base portion 21 is pivotally supported by the housing 1 so that the main body portion 22 can be swung. In addition to the damping valve V, which will be described later, a gap that appears between the housing 1 and the vane 2 may correspond to the damping portion, that is, the configuration that generates the damping force.

  1, reference numerals C1, C2, C3, and C4 indicate that the hydraulic oil from the two oil chambers R1 and R2 is arranged in parallel with the single damping valve V and the damping valve V through the flow paths L1 and L2. The so-called flow direction is adjusted so as to pass through the relief valve Vr, and an oil temperature compensating accumulator A is connected to the flow paths L1 and L2.

  Therefore, as is apparent from this circuit configuration, even in the rotary damper according to the present invention, the two oil chambers R1 and R2 defined by the vane 2 in the housing 1 are operated with each other when the vane 2 swings. A predetermined damping force is generated by the damping portion through which the hydraulic oil passes when it is made to flow in and out, that is, the damping valve V.

  In the rotary damper, the housing 1 is connected to, for example, the handle side of the motorcycle and the vane 2 is connected to the vehicle body side of the motorcycle. It becomes possible to suppress mutual swinging through the head pipe.

  Incidentally, even in the rotary damper according to the present invention, as shown in FIGS. 2 and 3, the vane 2 accommodated in the housing 1 can be swung by pivotally supporting the base 21 on the housing 1. When the main body portion 22 defines two oil chambers R1 and R2 in the housing 1, the two oil chamber oil chambers R1 and R2 are made to flow into and out of each other by the swinging of the main body portion 22. It is assumed that a predetermined damping force is generated in the damping part through which the hydraulic oil passes, that is, the damping valve V (see FIG. 1).

  At this time, as shown in FIG. 3, the base portion 21 in the vane 2 is configured to allow the output shaft 3 to pass through the shaft core portion, and the tip end portion that is the upper end portion in the drawing of the output shaft 3 is the pivot portion 31. Thus, it is fitted into the pivot 11 which is a recess formed in the housing 1, that is, the base 21 in the vane 2 can be pivotally supported with respect to the housing 1, thereby ensuring the swinging of the main body 22 in the housing 2 in the vane 2. If so.

  In addition, the vane 2 is configured such that the seal member 4 is disposed on the end surface facing the so-called inner surface of the housing 1, that is, the end surface of the base portion 21 and the main body portion 22. It is assumed that no leakage of the hydraulic fluid between the housing 1 and the sealing performance is ensured.

  By the way, as described above, in this type of rotary damper, the damping part that generates a damping force when the vane 2 swings in the housing 1 may be formed of a gap that appears between the housing 1 and the vane 2. As described above, in the rotary damper according to the present invention, the vane 2 includes the seal member 4 that is in sliding contact with the inner surface of the housing 1 as described above. Will not exist.

  Further, the output shaft 3 penetrating the shaft core portion of the base portion 21 in the vane 2 is configured such that the main body portion 32 is connected to the shaft core portion of the base portion 21 in the vane 2 under a serration structure. This is because it is possible to remove the vane 2 from the shaft 3, that is, to replace the seal member 4 interposed in the vane 2.

  Therefore, as for the connection between the output shaft 3 and the vane 2, as long as the vane 2 can be removed from the output shaft 3, a connection method other than the above serration structure may be selected. is there.

  On the contrary, when it is impossible to replace the seal member 4 or the like, the main body 32 of the output shaft 3 may be fixedly connected to the base 21 of the vane 2. is there.

  The main body 32 of the output shaft 3 includes a part of the housing 1, that is, a connecting portion 33 formed in a bolt shape by penetrating the lid 12 under the arrangement of the bearing member 13 and the seal member 14. It is supposed to protrude outside.

  Incidentally, when the housing 1 is connected to the handle side of a motorcycle, for example, the connecting portion 33 in the output shaft 3 is a motorcycle that can swing relative to the handle side via a head pipe. It will be connected to the vehicle body side.

  On the other hand, even in the rotary damper according to the present invention, the axially formed thrust surface of the base 21 of the vane 2, that is, the thrust formed in an annular shape between the one end surface serving as the upper end surface in FIG. 3 and the inner surface of the housing 1. The washer 5 is distributed.

  Therefore, in the rotary damper according to the present invention, not only the end surface of the base 21 in the vane 2 but also one end surface of the output shaft 3 that is pivotally supported by the housing 2 through the shaft core portion of the base 21. That is, since the thrust washer 5 is provided even when one end surface of the main body portion 32 of the output shaft 3 is pressed against the inner surface of the housing 1, the base end portion 21 of the vane and the housing 1 of the main body portion 32 of the output shaft 3 are provided. Therefore, the slidability of the main body 22 in the vane 2 within the housing 1 is ensured.

  Incidentally, in the illustrated embodiment, the thrust washer 5 is formed thin like a shim, while the base 21 has the same outer diameter as the upper end surface of the base 21 in the vane 2. It is supposed that it is formed in the annular | circular shape which has the internal diameter same as the pivot part 31 in the output shaft 3 which penetrates this axial center part.

  This is because the thrust washer 5 is in a predetermined position to ensure the slidability of the base 21 in the vane 2 with respect to the housing 1, so that it is not necessary to form the vane 2 with a larger diameter than the base 21. This is because the possibility of movement with respect to the base 21 in the vane 2 remains unfavorable because the diameter is smaller than that of the base 21 in 2.

  That is, the present invention is intended to prevent the thrust washer 5 disposed at a predetermined position from moving from the predetermined position, as will be described later. In many cases, it is considered that the size of the base 21 in the vane 2 is the same as that of the base 21.

  At this time, the fact that the predetermined position is formed larger than the base portion 21 in the vane means that the thrust washer 5 is also formed in a larger diameter than the base portion 21 in the vane 2. It is no exaggeration to say that the washer 5 is formed to have a diameter larger than that of the base portion 21 in the vane 2 as a normal state.

  On the other hand, it cannot be said that the thrust washer 5 has a smaller diameter than the base 21 in the vane 2, but if the thrust washer 5 is formed in a smaller diameter than the base 21 in the vane 2, this thrust washer Considering that 5 is disposed at a predetermined position, it is important that the predetermined position is also formed to have the same diameter as the thrust washer 5.

  If so, the predetermined position where the thrust washer 5 formed with a smaller diameter than the base 21 in the vane 2 is required to be separately formed in the housing 1, that is, the housing 1 is different from the vane 2 in the vane 2. In addition to forming a space for the base portion 21, it is necessary to further form a space for disposing the thrust washer 5, which is not preferable because it requires labor for so-called component processing.

  From this, it can be said that only the thrust washer 5 is not formed with a small diameter while the predetermined position where the thrust washer 5 is disposed is formed with the same diameter as the base 21 in the vane 2.

  By the way, in the rotary damper according to the present invention, the following consideration is given to disposing the thrust washer 5 at a predetermined position, but this will be described a little.

  That is, first, the thrust washer 5 is disposed at a predetermined position in the housing 1, but in the present invention, the thrust washer 5 is disposed so as not to move from the predetermined position. Assembling work when the output shaft 3 connected to the shaft core portion of the base 21 of the vane 2 is pivotally supported by the housing 1 is smoothly realized.

  This is because, as described above, the output shaft 3 is pivotally supported by the housing 1 by inserting the pivot portion 31 which is the tip of the output shaft 3 into the pivot portion 11 formed in the housing 1. The pivot 31 is inserted into the pivot 11 through a hole 51 (see FIG. 2) opened in the center of the thrust washer 5.

  Accordingly, when the thrust washer 5 is moved from a predetermined position and the central hole 51 is so-called shifted, the pivot portion 31 of the output shaft 3 cannot be fitted into the pivot portion 11 of the housing. The operation of pivotally supporting the housing 1 on the housing 1 is not realized smoothly.

  Therefore, according to the present invention, the thrust washer 5 disposed at a predetermined position does not freely move after the dredging. Therefore, when the output shaft 3 is pivotally supported on the housing 1, the thrust washer 5 performs the so-called hindrance. Therefore, the operation of pivoting the output shaft 3 as a desired operation on the housing 1 can be smoothly realized.

  Specifically, as shown in FIG. 2, in the rotary damper, the housing 1 has a stopper portion 15 that prevents the thrust washer 5 disposed at a predetermined position in the housing 1 from moving from the predetermined position. To do.

  At this time, with respect to a predetermined position set in the housing 1, as shown in FIG. 2, basically, it is in the housing 1 and is a circle on the side surface of the base 21 (see FIG. 3) in the vane 2. A circumferential portion 16 having the same curvature as the peripheral surface, and a pair of extending portions 17 and 18 extending in parallel with the tangential direction indicated by reference numerals a and b in FIG. 2 from the maximum diameter portion of the circumferential portion 16. And having a substantially U shape in plan view.

  Incidentally, the reason why the circumferential portion 16 has the same curvature as the circumferential surface that is the side surface of the base portion 21 in the vane 2 is that the thrust washer 5 is formed in an annular shape having the same outer diameter as the upper end surface of the base portion 21. Because it becomes.

  On the other hand, the stopper portion 15 may be embodied in a free form as long as it can prevent the free movement of the thrust washer 5 as a result. However, in the drawing, the extension portion 17 is partially raised. It is supposed to become.

  At this time, the stopper portion 15 is formed so as to have the same height as the thickness of the thrust washer 5, but instead, the stopper portion 15 has the same height as the base portion 21 in the vane 2. It may be formed.

  And when making the height of the stopper part 15 the same as the thickness of the thrust washer 5, the number of processing is larger compared with the case where it is formed so as to be the same as the height of the base part 21 in the vane 2. Therefore, it can be said that there is a disadvantage of increasing the so-called component cost.

  Further, when the height of the stopper portion 15 is made equal to the thickness of the thrust washer 5, the operation of arranging the thrust washer 5 at a predetermined position where the stopper portion 15 is defined as it is defined. Therefore, it can be said that it is advantageous from the viewpoint of assembly work as compared with the case where the height of the stopper portion 15 is formed to be the same as the height of the base portion 21 in the vane 2.

  In view of the above, it goes without saying that the stopper portion 15 may be formed on both the extension portions 17 and 18 instead of being formed only on the one extension portion 17.

  Since the thrust washer 5 does not easily move from a predetermined position due to the formation of the stopper portion 15, the thrust washer 5 does not interfere with the operation when the output shaft 3 is pivotally supported on the housing 1. Therefore, the operation of pivoting the output shaft 3 as a desired operation on the housing 1 can be realized smoothly.

  In particular, in the present invention, as shown in FIG. 4, there is a problem that the thrust washer 5 enters the groove 34 formed between the pivot 31 and the main body 32 as the tip of the output shaft 3. Invitation can be avoided.

  That is, in the output shaft 3, when the pivot portion 31 is formed by cutting at a so-called tip portion of the main body portion 32, the end face of the main body portion 32 is made adjacent to the thrust washer 5 through the seal member 4. It is necessary to finish so-called polishing.

  At this time, the jig polishes the end surface of the main body 32 in a so-called unpolished state by biting into the root of the pivot 31, that is, by forming a groove 34 at the root of the pivot 31. It becomes possible to raise.

  For this reason, in the output shaft 3, a groove 34 appears between the pivot portion 31 and the main body portion 32. Therefore, the output shaft, that is, the pivot portion 31 is formed in the housing 1. If the thrust washer 5 is moved during the work of fitting into the pivot part 11, the inner peripheral part of the thrust washer 5 enters the groove 34, and therefore the work of fitting the pivot part 31 into the pivot part 11. Cannot continue.

  Therefore, the stopper portion 15 prevents the free movement of the thrust washer 5 due to the formation of the stopper portion 15. Therefore, the insertion of the thrust washer 5 into the groove 34 prevents the pivot portion 31 from being inserted into the pivot portion 11. Don't be afraid.

  As described above, the housing 1 is formed in a so-called independent form, but it is needless to say that the housing 1 may be formed integrally with a bracket for holding a handle in a motorcycle.

  In the above description, the vane 2 does not have an orifice as an attenuation portion. Instead, the vane 2 may have an orifice. In this case, the vane 2 may be provided between the vane 2 and the housing 1. Of course, the appearing gap may be the attenuation part.

  In the above description, the case where the rotary damper according to the present invention is used for a steering structure in a motorcycle has been described as an example. However, from the point of view of the present invention, the rotary damper according to the present invention is used for steering in a bicycle. Of course, it may be used for the structure.

It is a principle figure which shows the rotary damper by this invention with a circuit. It is a cross-sectional view shown in a plan view of a state in which a thrust washer is arranged at a predetermined position in the housing of the rotary damper according to the present invention. It is a longitudinal cross-sectional view which shows the rotary damper by this invention partially in front view. It is the elements on larger scale which show the positioning of an output shaft and a thrust washer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Vane 3 Output shaft 4 Seal member 5 Thrust washer 11 Pivoting part 15 Stopper part 16 Circumferential part 17,18 Extension part 21 Base part 22 Main body part 31 Pivot part R1, R2 Oil chamber V Damping valve as damping part

Claims (4)

Two oil chambers are defined in the housing by a body portion in which a housing vane is connected to a base portion pivotally supported by the housing and is swingable in the housing. When the main body part is swung out by flowing the working oil into and out of the main body part, the damping part that allows the working oil to pass therethrough generates a predetermined damping force, while the axial end surface of the base part of the vane and the inner surface of the housing The thrust washer is disposed at a predetermined position in the housing, and this predetermined position has the same curvature as the circumferential surface of the side surface of the base portion of the vane. And a pair of extensions extending in a tangential direction from the circumference, and formed in a substantially U shape in plan view, and at least one of the pair of extensions is Is divided manner uplifted rotary damper characterized by comprising a stopper portion for preventing movement from the predetermined position in the thrust washer. The thrust washer has an outer diameter that is the same as the outer diameter of the base portion of the vane, and has a hole that penetrates the pivot portion of the output shaft that penetrates the shaft core portion of the base portion of the vane at the center portion. Rotary damper. The rotary damper according to claim 1, wherein a base portion of the vane is slidably contacted with a thrust washer while having a seal member on an end surface in the axial direction. The rotary damper according to claim 1, wherein a main body portion of the vane swinging in the housing has a seal member that is slidably in contact with an inner surface of the housing while being integrally connected to a base portion of the vane.

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