JP2008309320A - Axle spring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a further improved desirable axle spring device, by realizing a spring constant change by an angle in the horizontal direction by an inexpensive and rational means, by reducing or eliminating a large increase in mold cost and an increase in manufacturing man-hours. <P>SOLUTION: This axle spring device is formed by interposing an elastic part 3 formed by alternately laminating intermediate hard cylinders 9 and 10 and elastic layers 11-13 in the radial inner-outer direction in a concentric or substantially concentric state with the axis P, between a main shaft 1 and an outer cylinder 2 having mutually the same or substantially same axis P as this main shaft, and is equipped with an elastic regulating mechanism 4 formed by loosely fitting an outer cylinder side member 14 fixed and supported by the outer cylinder 2 and the main shaft 1 via an elastic material D in a state of having the fitting axis X along the axis P. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shaft spring device that can be used in large construction machines, large ships, and the like and is mainly used in railway vehicles. More specifically, the present invention relates to a main shaft and an outer cylinder having the same or substantially the same axis as each other. The present invention relates to an axial spring device in which an intermediate cylindrical tube and an elastic layer are alternately stacked in the inner and outer directions concentrically or substantially concentrically with the shaft center.

  As this type of shaft spring device, as disclosed in Patent Document 1, for example, a shaft spring device used for a carriage as a suspension of a railway vehicle is known. This is because by providing an auxiliary spring on the main shaft, it exhibits excellent followability when the vehicle weight is small, such as when the vehicle is empty, while cracking or creeping rubber when the vehicle weight exceeds the capacity. It is described that durability can be improved by reducing the above.

  In such a shaft spring device, regarding the requirements for different spring constants in the horizontal direction, for example, a three-layer rubber constituting the elastic portion 3 as in the shaft spring device A shown in the plan view shown in FIG. Of the layers 11, 12, and 13, for example, the outermost rubber layer 13 may be provided with a thinned portion n or n. In the example of FIG. 7, since the thinned portions n are provided at both ends in the direction of arrow A, the spring constant is relatively soft in the direction of arrow A in the horizontal direction, and relatively small in the direction of arrow B in the horizontal direction. It is possible to make a difference such as a hard spring constant. In FIG. 7, 9 and 10 are hard plates, and 2Z is a flange fitted and connected to the outer cylinder 2.

For example, an impact during acceleration / deceleration (especially during sudden acceleration or braking), that is, a shock mainly occurs in the front-rear direction. Therefore, when the shaft spring device having the configuration shown in FIG. By arranging and setting the direction so as to face the traveling direction of the railway vehicle (rail direction), it is possible to provide an axial spring device that meets the characteristics.
JP2003-40107

  However, there are some problems with the means for providing a thinned portion in the rubber layer. Since it is a means for providing a lightening, it is first impossible to divert the existing shaft spring device (it is difficult to form a lightening part in the rubber layer after completion and the cost becomes high). , There is an inconvenience that there is no choice but to make a new work (cannot divert existing products) In that case, in order to make a hollow part when molding the mold, it is necessary to add a nested mold and eventually create a new mold, resulting in a new expensive mold cost and an increase in man-hours. Invite. In addition, depending on the shape of the thinned portion (diameter thin and flat shape, etc.), there is a problem that the nesting mold is easily distorted.

  The purpose of the present invention is to make it possible to realize a change in the spring constant according to the angle in the horizontal direction by an inexpensive and rational means with little or no increase in mold costs and production man-hours by further structural improvements. It is in providing a more improved and desirable shaft spring device.

According to the first aspect of the present invention, the intermediate hard cylinders 9 and 10 and the elastic layers 11 to 13 are arranged between the main shaft 1 and the outer cylinder 2 having the same or substantially the same axis P as the axis P. In an axial spring device in which elastic portions 3 are alternately stacked in the inner and outer diameter directions concentrically or substantially concentrically with each other,
An elastic restriction formed by loosely fitting an outer cylinder side member 14 fixedly supported by the outer cylinder 2 and the main shaft 1 through an elastic material D with a fitting axis X along the axis P. The mechanism 4 is equipped.

  According to a second aspect of the present invention, in the shaft spring device according to the first aspect, the elastic regulation mechanism 4 is configured such that the fitting axis X coincides with the axis P and the outer periphery is made of the elastic material D. The rod-like portion 14A in the outer cylinder side member 14 having the rod-like portion 14A that is integrally equipped with the elastic layer 15 is formed in the main shaft 1 in which the fitting hole 5 with the axis P as the center is formed. It is configured by being loosely fitted in the fitting hole 5.

  According to a third aspect of the present invention, in the shaft spring device according to the first aspect, the elastic regulating mechanism 4 includes a rod-shaped portion 14A in which the fitting shaft center X coincides with the shaft center P. In the main shaft 1, the rod-like portion 14 </ b> A in the member 14 is formed in the main shaft 1 in which the fitting hole 5 is integrally formed with the elastic layer 16 made of the elastic material D centered on the shaft center P. It is configured by being loosely fitted in the fitting hole 5.

In the invention according to claim 4, the intermediate hard cylinders 9 and 10 and the elastic layers 11 to 13 are arranged between the main shaft 1 and the outer cylinder 2 having the same or substantially the same axis P as the axis P. In an axial spring device in which elastic portions 3 are alternately stacked in the inner and outer diameter directions concentrically or substantially concentrically with each other,
A support member 14 that is integrally stacked on the outer cylinder 2 via an elastic member 17, and is integrally projected on the support member 14 so as to be directed to the main shaft 1 along the axis P direction. When a force in a direction intersecting the axis P is applied between the support member 14 and the main shaft 1, the rod-shaped portion 14A and the outer cylinder 2 come into contact with each other. A displacement difference contact mechanism B for loosely fitting each of the rod-shaped portion 14A, the outer cylinder 2 and the main shaft 1 is provided so that the rod-shaped portion 14A and the main shaft 1 are in contact with each other. It is characterized by.

  According to a fifth aspect of the present invention, in the shaft spring device according to any one of the first to fourth aspects of the present invention, the relative movement of both the rod-like portion 14A and the main shaft 1 in the loosely fitting structure portion is provided. A compressible elastic member 18 is provided, and the compression of the elastic member 18 starts after the rod-like portion 14A and the main shaft 1 move relative to each other by a predetermined amount due to compressive deformation of the elastic portion 3 in the axis P direction. The auxiliary elastic mechanism C configured as described above is equipped.

  According to the first aspect of the present invention, the elastic regulation is formed by loosely fitting the outer cylinder side member fixed to the outer cylinder and the main shaft via the elastic member in a state having the fitting axis along the axis. Since the mechanism is provided, flexible initial and medium-term operation and end-operation with tension, as well as horizontal movement beyond a certain level, are prevented against impact during braking, excessive input, or roll regulation during curve driving. This is a shaft spring device that exhibits the characteristics and can improve the suspension performance in the horizontal direction and prolong the life of the product (improvement of durability). In addition, there is no cutout in the rubber layer and there is no remodeling of mold costs or the establishment of a nested mold. As a result, it is possible to realize a change in the spring constant according to the angle in the horizontal direction by an inexpensive and rational means with little or no increase in mold costs and production man-hours. Can be provided.

  In this case, as in the second aspect, in the elastic regulation mechanism that loosely fits the rod-shaped portion with the elastic layer sheathed in the fitting hole of the main shaft, it is more elastic than the case where the elastic layer is provided on the inner peripheral surface of the hole. In the elastic regulation mechanism in which the rod-like portion is loosely fitted in the fitting hole provided on the inner peripheral surface as in claim 3, the layer is easily equipped and processed, which is advantageous in terms of workability and cost. Further, it is possible to adopt a processing means (such as vulcanization adhesion) for attaching the elastic layer to the main shaft together with the elastic portion, and there is an advantage that the processing cost and productivity at that point are excellent.

  According to the invention of claim 4, which will be described in detail in the embodiment, the horizontal suspension characteristics equivalent to those in the embodiment 1 can be obtained, and the vertical suspension characteristics can be improved, that is, the ride comfort can be improved. A shaft spring device that can achieve both good and more striking non-linear characteristics in the vertical direction can be realized.

  According to the invention of claim 5, since the auxiliary elastic mechanism is provided in which the elastic member starts to be compressed after the rod-like portion and the main shaft move relative to each other by a predetermined amount, not only the horizontal direction but also the vertical suspension characteristics are clearly non-linear. It is possible to provide a shaft spring device that can have characteristics and is more excellent overall.

  Hereinafter, an embodiment of a shaft spring device according to the present invention will be described with reference to the drawings as being used for a bogie of a railway vehicle. 1, 3, 4, and 6 are partially cutaway side views of shaft spring devices according to the first, second, third, and fourth embodiments, respectively, and FIGS. 2 and 5 illustrate nonlinear characteristics of the shaft spring device according to the first and third embodiments. It is a graph to show.

[Example 1]
As shown in FIG. 1, a shaft spring device A for a railway vehicle according to the first embodiment includes a main shaft 1, an outer cylinder 2, an elastic portion 3 interposed between the main shaft 1 and the outer cylinder 2, Although not shown in the figure, the elastic regulating mechanism 4 is provided at each of the front and rear sides of the center of the axle of the railway vehicle. The shaft spring device A is often used in an upright posture in which the main shaft 1 is positioned below the outer cylinder 2 as shown.

  The circular main shaft 1 as viewed in the vertical direction is supported from the lower end support portion 1A supported on the cart side, the upper body portion 1B, the flange portion 1C between the upper and lower portions of the support portion 1A and the body portion 1B, and the upper end. It is formed to have a fitting hole 5 having a circular shape in plan view, which is formed so as to hang over substantially the center of the part 1A. The outer peripheral surface 6 of the main body 1 </ b> B is formed in a conical surface (tapered outer peripheral surface) whose diameter with respect to the vertical axis P increases toward the lower side.

  The cylindrical outer cylinder 2 has a conical surface whose diameter increases with respect to the vertical axis P toward the lower side, that is, a tapered inner peripheral surface 7 and a fitting inner peripheral portion 8 on the upper portion thereof. The taper inner peripheral surface 7 is set to have the same inclination angle and direction as the outer peripheral surface 6. In addition, a flange disk portion 14B of the outer cylinder side member 14 described later is supported in the fitting inner peripheral portion 8 by fitting. The outer cylinder 2 is set to have a relative height with respect to the main shaft 1 such that the lower end portion thereof is at a height level positioned at the upper end portion of the main shaft 1.

  The elastic part 3 has inner and outer first and second intermediate rigid cylinders 9 and 10 and rubber elastic layers 11, 12, and 13 alternately in the inner and outer directions in a state of being concentric (or almost concentric) with the axis P. It is configured by laminating. Each of the intermediate rigid cylinders 9 and 10 and each of the elastic layers 11 to 13 are formed in a tapered cylindrical shape inclined at the same angle in the same direction as the outer peripheral surface 6, and the inner peripheral surface of the innermost first elastic layer 11 is The outer peripheral surface 6 of the main shaft 1 is integrated by means such as vulcanization adhesion, and the outer peripheral surface of the outermost third elastic layer 13 is integrated with the tapered inner peripheral surface 7 of the outer cylinder 2 by means such as vulcanization adhesion. It has become.

  The elastic regulating mechanism 4 is an elastic material in a state in which the outer cylinder side member 14 having a substantially T-shape in a side view fixedly supported by the outer cylinder and the main shaft 1 have a fitting axis X along the axis P. It is configured by loosely fitting via D. Specifically, the elastic regulation mechanism 4 has an integrated elastic layer 15 (an example of the elastic material D) made of an elastic material such as rubber on the outer periphery, with the fitting axis X coinciding with the axis P. The fitting hole 5 with the axis P as the center is provided on the rod-like portion 14A of the outer cylinder side member 14 having the rod-like portion 14A having a circular section and the flange disc portion 14B fitted inside the outer cylinder 2. It is comprised by loosely fitting in the fitting hole 5 in the main shaft 1 to be formed. The elastic layer 15 can have various configurations such as a configuration in which the elastic layer 15 is intermittently present in the circumferential direction and the axis P direction, or a net-like configuration, in addition to the configuration covering the entire circumference of the rod-shaped portion 14A as illustrated. .

  That is, normally (when no horizontal force is acting), as shown in FIG. 1, the axis P of the main shaft 1 and the axis W of the outer cylinder 2 coincide (the fitting axis X). And the axial centers of the fitting hole 5 and the rod-shaped portion 14A are also coincident with each other, and a slight gap d in the radial direction, that is, an annular gap is formed between the elastic layer 15 and the fitting hole 5. It is in the loose fitting state that exists. Accordingly, in the horizontal direction, the main shaft 1 and the outer cylinder 2 are suspended by the elasticity of only the elastic portion 3, that is, the first spring constant K1, until the main shaft 1 and the outer cylinder 2 move by a distance d in any direction regardless of front, rear, left and right. It becomes a state. When the main shaft 1 and the outer cylinder 2 move relatively in the horizontal direction by a distance d or more, the inner peripheral portion of the fitting hole 5 and the elastic layer 15 come into contact with each other, and this time, both the elastic portion 3 and the elastic layer 15 are in contact with each other. The state is suspended by the second spring constant k2 which is elastic, that is, higher than the first spring constant K1.

  That is, as in the horizontal suspension characteristic graph of the axial spring device A of Example 1 shown in FIG. 2, the displacement (deflection) with respect to the load in the horizontal direction is the first spring constant K1 up to the distance d, and more than that A non-linear characteristic having the second spring constant K2 is obtained. When the elastic layer 15 is compressed to some extent, the stopper function by the rod-like portion 14A is exhibited. This prevents flexible initial and mid-term operation, final operation with tension, and more than a certain level of horizontal movement against impacts during braking, excessive input, or lateral displacement control (roll control) during curve driving. Thus, the shaft spring device is capable of improving the suspension performance in the horizontal direction and extending the life of the product (improving durability). Further, a communication hole 5a having a small diameter is formed at the lower end of the fitting hole 5, and the space S surrounded by the elastic part 3 and the outer cylinder side member 14 by the fitting hole 5 and the communication hole 5a. The function as an air supply / exhaust part for communicating with the outside can be exhibited.

[Example 2]
As shown in FIG. 3, the shaft spring device A for railway vehicles according to the second embodiment is basically the same as the shaft spring device of the first embodiment shown in FIG. 1, except that the elastic regulation mechanism 4 is slightly different. is there. That is, the elastic regulating mechanism 4 is configured such that the rod-like portion 14A in the outer cylinder side member 14 having the rod-like portion 14A in which the fitting axis X coincides with the axis P is centered on the axis P and has rubber on the inner periphery. The elastic layer 16 (an example of the elastic material D) made of an elastic material such as the above is integrally fitted into the fitting hole 5 in the main shaft 1 in which the fitting hole 5 is integrally provided. The operations and effects of the shaft spring device A of the second embodiment are the same as those of the shaft spring device of the first embodiment.

  In the shaft spring device A according to the second embodiment, the elastic layer 16 is fitted on the inner periphery of the fitting hole 5, so that the elastic layer 16 can be vulcanized and bonded at the same time when the elastic portion 3 is vulcanized and bonded. There is an advantage to become. On the other hand, in the shaft spring device A of the first embodiment, the elastic layer 15 is externally fitted to the rod-like portion 14A, so that there is an advantage that the processing is easier than when the fitting hole 5 is provided.

Example 3
As shown in FIG. 4, the shaft spring device A for a railway vehicle according to the third embodiment includes an intermediate rigid cylinder 9, between the main shaft 1 and an outer cylinder 2 having the same or substantially the same axis P. 10 is an axial spring device in which an elastic portion 3 formed by alternately laminating 10 and elastic layers 11 to 13 in the inner and outer directions concentrically or substantially concentrically with the shaft center P is provided. A support member 14 that is integrally stacked via an elastic member 17 and a rod-like portion 14A that protrudes integrally to the support member 14 along the axis P direction toward the main shaft 1 are provided. When a force in a direction intersecting the axis P is applied between the support member 14 and the main shaft 1, the rod-shaped portion 14 </ b> A contacts the outer cylinder 2 and then the rod-shaped portion 14 </ b> A contacts the main shaft 1. Thus, the displacement difference contact mechanism B for loosely fitting each of the rod-shaped portion 14A, the outer cylinder 2 and the main shaft 1 is It is Bei.

  Specifically, a plate-like lid member 19 that covers the upper surface of the outer cylinder 2 is fitted and attached to the upper end of the outer cylinder 2, and a side surface is provided on the lid member 19 via an elastic material 17 having a laminated rubber structure. A support member 14 having a substantially T-shaped view is provided in a stacked manner. The elastic member 17 has a three-layer structure composed of two upper and lower rubber layers 20 and 20 and a hard plate 21 made of a single metal plate or the like interposed between the upper and lower rubber layers. The upper surface of the lid member 19 and the bottom surface of the support member 14 are integrated. The lid member 19 and the elastic member 17 are both formed in an annular shape as viewed in the vertical direction having the center holes 19a and 17a, and have a structure through which the rod-like portion 14A passes.

  The support member 14 includes an upper wall portion 14B mounted on the elastic member 17 and a rod-shaped portion 14A suspended from the center thereof, and the lower end portion of the rod-shaped portion 14A extends to the upper portion of the fitting hole 5 of the main shaft 1. It extends. The outer cylinder 2, the elastic portion 3, and the main shaft 1 are the same as those of the shaft spring device of the first and second embodiments, and the description thereof is omitted here. Thereby, the rod-shaped portion 14 </ b> A (support member 14) is mounted on the main shaft 1 via the elastic portion 3 and the elastic material 17. In this case, the railway vehicle is connected to the support member 14 instead of the outer cylinder 2.

  The displacement difference contact mechanism B has a larger diameter difference d2 between the fitting hole 5 of the spindle 1 and the rod-shaped portion 14A than the diameter difference d1 between the center hole 19a of the lid member 19 and the rod-shaped portion 14A (d1 <d2). Is to set. However, the horizontal force over the main shaft 1 and the support member 14 from the overall conditions such as the horizontal spring constant of the elastic portion 3, the horizontal spring constant of the elastic member 17, and the initial load such as pre-compression thereof. Thus, the values of d1 and d2 are determined so that the center hole 19a of the lid member 19 first comes into contact with the rod-shaped portion 14A, and then the fitting hole 5 and the rod-shaped portion 14A come into contact with each other.

  Therefore, as shown in FIG. 5, the horizontal suspension characteristic graph of the shaft spring device A of Example 3 shows the elastic portion 3 until the relative horizontal displacement between the main shaft 1 and the support member 14 is d1. The first spring constant k1 is soft due to both the elastic member 17 and the elastic member 17, and when the amount of displacement is not less than d1 and less than d2, the hard second spring constant k2 is obtained only by the elastic portion 3. When the amount of displacement reaches d2, a rigid state in which the main shaft 1 and the rod-like portion 14A are in direct contact is brought about. When the relative movement amount between the rod-shaped portion 14A and the center hole 19a is d1, the relative movement amount between the rod-shaped portion 14A and the fitting hole 5 is d1 '(d1 <d1' <d2: see FIG. 5). The action and effect concerning the horizontal direction of the shaft spring device A according to the third embodiment is considered to be substantially the same as that of the shaft spring device according to the first embodiment.

  With respect to the vertical direction, both the elastic portion 3 and the elastic material 17 resist the load in the vertical direction, so that the cushion stroke can be increased without difficulty compared to the case where only the elastic portion 3 is used. And the advantage that a softer ride is possible. Further, depending on the setting of rubber hardness, the elastic portion 3 may be in charge of a soft spring constant, and the elastic member 17 may be in charge of a hard spring constant to constitute a suspension characteristic having a more ideal non-linear characteristic. Is possible.

Example 4
As shown in FIG. 6, the shaft spring device A for railway vehicles according to the fourth embodiment basically uses the shaft spring device of the first embodiment, and is a loose fit between the rod-like portion 14 </ b> A and the main shaft 1. An elastic member 18 that can be compressed by the relative movement of the two parts 14A, 1 is provided in the structural portion, and the rod-like part 14A and the main shaft 1 are elastically moved relative to each other by a predetermined amount due to the compressive deformation of the elastic part 3 in the axis P direction. The auxiliary elastic mechanism C configured to start the compression of the member 18 is equipped. In FIG. 6, the fitting hole 5 in the shaft spring device according to the first embodiment is provided with a rod-like rubber 18 that is circular as viewed in the vertical direction as the elastic member 18.

  The rod-shaped rubber 18 has a slightly smaller diameter than the inner diameter of the fitting hole 5, but a flange portion 18 a that is substantially equal to the inner diameter of the fitting hole 5 is formed so that only the upper end portion has a guide function. The bar-shaped rubber 18 is arranged so as to be mounted on the bottom surface 5b having a V-shaped cross section of the fitting hole 5 by gravity, and the vertical distance h between the upper end of the bar-shaped rubber 18 and the lower end of the bar-shaped portion 14A is the predetermined amount described above. (Predetermined amount h). That is, with respect to the load in the vertical direction, in the range until the rod-shaped portion 14A comes into contact with the rod-shaped rubber 18, only the elastic portion 3 is suspended with a relatively soft spring constant, and a large load such as when a passenger gets in a full load. When the rod-like portion 14 </ b> A comes into contact with the rod-like rubber 18 by acting, a suspended state with a relatively hard spring constant due to the elasticity of both the elastic portion 3 and the rod-like rubber 18 is obtained.

  Therefore, the shaft spring device A of the fourth embodiment exhibits a suspension characteristic with a non-linear spring constant both in the horizontal direction and in the vertical direction, and the ride comfort is emphasized in the first half of the cushion stroke in either direction. A soft suspension state is obtained, and in the latter half of the cushion stroke, it has improved high performance so that a suspended state with a waist can be obtained with a high spring constant so that it can stand and stand under a heavy load.

[Another Example]
The elastic regulation mechanism 4 uses a structure in which, for example, the lower end portion of the rod-like portion 14A in the first embodiment is cylindrical, and the upper end portion of the main shaft 1 is fitted into the lower end portion of the cylindrical rod-like portion 14A. Can be configured. Similarly, the displacement difference contact mechanism B and the auxiliary elastic mechanism C can be variously modified.

The side view of the notch which shows the shaft spring apparatus by Example 1 The figure which shows the nonlinear characteristic graph of the axial spring apparatus of FIG. The side view of the notch which shows the axial spring apparatus by Example 2 The side view of the notch which shows the axial spring apparatus by Example 3 The figure which shows the nonlinear characteristic graph of the axial spring apparatus of FIG. The side view of the notch which shows the axial spring apparatus by Example 4 Plan view showing a conventional shaft spring device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main axis | shaft 2 Outer cylinder 3 Elastic part 4 Elastic regulation mechanism 5 Fitting hole 9,10 Intermediate | middle rigid cylinder 11-13 Elastic layer 14 Outer cylinder side member 14A Rod-like part 15 Elastic layer 16 Elastic layer 17 Elastic material 18 Elastic member A Axial spring Device B Displacement differential contact mechanism C Auxiliary elastic mechanism D Elastic material P Shaft center X Fitting shaft center

Claims (5)

Elasticity formed by alternately laminating intermediate hard cylinders and elastic layers concentrically or substantially concentrically with the axis in the inner and outer directions between the main shaft and an outer cylinder having the same or substantially the same axis. A shaft spring device having a portion interposed therein,
Equipped with an elastic regulating mechanism formed by loosely fitting an outer cylinder side member fixed to and supported by the outer cylinder and the main shaft through an elastic material in a state having a fitting axis along the axis. Axial spring device.   The rod-shaped portion in the outer cylinder side member, wherein the elastic regulation mechanism has a rod-shaped portion in which the fitting axis coincides with the shaft center and an elastic layer made of the elastic material is integrally provided on the outer periphery. The shaft spring device according to claim 1, wherein the shaft spring device is loosely fitted into the fitting hole in the main shaft in which a fitting hole having the shaft center as a center is formed.   The elastic restricting mechanism has the rod-shaped portion of the outer cylinder side member having a rod-shaped portion whose fitting axis is aligned with the shaft center, and the elastic material is formed on the inner periphery of the rod-shaped portion. The shaft spring device according to claim 1, wherein the shaft spring device is configured to be loosely fitted into the fitting hole in the main shaft formed with a fitting hole integrally provided with an elastic layer. Elasticity formed by alternately laminating intermediate hard cylinders and elastic layers concentrically or substantially concentrically with the axis in the inner and outer directions between the main shaft and an outer cylinder having the same or substantially the same axis. A shaft spring device having a portion interposed therein,
A support member that is integrally stacked on the outer cylinder via an elastic material, and a rod-like portion that integrally protrudes from the support member toward the main shaft along the axial direction. When the force in the direction intersecting the axis acts between the support member and the main shaft, the rod-shaped portion and the main shaft come into contact with each other after the rod-shaped portion and the outer cylinder come into contact with each other. Thus, a shaft spring device equipped with a displacement difference contact mechanism for loosely fitting each of the rod-shaped portion, the outer cylinder, and the main shaft.   An elastic member that can be compressed by relative movement between the rod-like portion and the main shaft is provided in the loosely fitting structure portion, and the rod-like portion and the main shaft are located by compressive deformation of the elastic portion in the axial direction. The shaft spring device according to any one of claims 1 to 4, further comprising an auxiliary elastic mechanism configured to start compression of the elastic member after a fixed relative movement.

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