JP5936289B2 - Spring device and cylinder device using the same - Google Patents

Description

  The present invention relates to a spring device that can be effectively applied to a spring device that is unitized so that it can be handled independently, in particular, a cylinder device used in a hydraulic brake system of a vehicle.

  A conventional spring device includes a pair of retainer members that can be elastically deformed together, and a spring (compression coil spring) supported by the retainer members. Both retainer members are hollow hollow cylinders, and have a structure in which a retainer member having a large diameter (second retainer member) is fitted to an outer periphery of a retainer member having a smaller diameter (first retainer member). Therefore, the first retainer member and the second retainer member are coupled to each other as the male side and the female side. The relationship between the male side and the female side may be reversed, and is achieved by appropriately adjusting the dimensional relationship between both retainer members.

The first and second retainer members include a main body portion, a claw portion, and a spring receiving portion formed at an end portion. The spring receiving portion is provided with a flange-like projecting portion radially outward from the role of supporting the end of the spring.
The claw portions of the first and second retainer members are engaged with each other, and the springs are disposed on both spring receiving portions, thereby increasing the maximum length of the first and second retainer members. The regulation and the maximum length of the spring can be regulated. Thereby, it becomes a unit which can handle the spring apparatus of the state to which the desired spring force (preload) was given independently.
(See Patent Document 1).

Japanese Patent No. 4169214

In the conventional spring device, the following problems are assumed.
As described above, the spring device is in a state where a desired spring force is applied by assembling the first and second retainer members and the spring. At this time, the spring is supported by the spring receiving portion. ing. That is, the spring receiving portion receives the desired spring force.
As the spring receiving portion of the second retainer member disclosed in Patent Document 1, three spring receiving portions and three holes having the same shape, which are independent of each other, are arranged alternately and uniformly.

The spring having a desired spring force is used, and this spring force varies, and when the spring is assembled to the spring receiving portion, particularly where the end winding portion of the spring is located. Depending on whether or not the spring receiving part is attached, it is conceivable that a part or all of the spring receiving part bends slightly inward (axial core side) from the free state.
Thus, in a state where a part or all of the spring receiving portion is bent more than a predetermined amount, the spring receiving portion is used by being fitted into the opening formed at the end of the first retainer member or the second retainer member. For example, it is conceivable that the engagement with the piston becomes impossible.

  Then, this invention aims at providing the spring apparatus which solved the above-mentioned problem, and a cylinder apparatus using the same.

The spring device according to the present invention applies a spring force to a piston that is an internal part of a cylinder hole, and is supported by a pair of retainer members that engage with each other so that the length in the axial direction can be expanded and contracted. A spring device that is unitized so that it can be handled separately from the piston.
The pair of retainers have a cylindrical shape with a hollow portion therein, and a spring receiving portion that receives an end portion of the spring is formed. The spring receiving portion relatively sets a set load of the spring. The portions that receive strongly and the portions that receive relatively weakly as compared to the portion that receives strongly are alternately arranged, and the spring is set on the pair of retainer members, so that the set load is relatively A spring device characterized in that an inner diameter or an outer diameter of an opening end portion of the hollow portion of the strongly receiving portion approximates an inner diameter or an outer diameter of the opening end portion of the hollow portion of the relatively weakly receiving portion.

  Thus, after the pair of retainer members and the springs are assembled, the hollow end of the hollow portion of the portion that receives the set load relatively strongly and the set load are relatively weakly received. The inner diameter or outer diameter of the open end of the hollow portion of the portion is approximate, and a spring device having a desired diameter can be obtained.

  In addition, the spring receiving portion is formed to protrude radially outward from the main body portions of the pair of retainer members, and the portion that receives the set load of the spring relatively weakly is a thin portion having a desired thickness. And the part which receives the set load of the said spring relatively strongly is a thick part thicker than the said thin part, It is characterized by the above-mentioned.

  Thereby, the spring apparatus of a desired diameter dimension can be obtained by shape | molding the said thin part and the said thick part.

  Furthermore, the portion that receives the set load of the spring strongly is a portion that is difficult to be elastically deformed, and the portion that receives the set load of the spring weakly is more elastic than the portion that is difficult to elastically deform. It is an elastically deformable part.

  Thereby, the spring apparatus of a desired diameter dimension can be obtained by controlling the allowance of elastic deformation and performing desired dimension management.

  Further, the elastically deformable part is a thin part having a desired thickness, and the elastically difficult part is a thick part thicker than the thin part.

  Thereby, the spring apparatus of a desired diameter dimension can be obtained by shape | molding the said thin part and the said thick part.

Furthermore, the thin-walled portion is formed by cutting a part of the spring receiving portion, or the thick-walled portion is formed thickly with respect to a part of the spring receiving portion.

  Thereby, a spring device having a desired diameter can be obtained while easily obtaining the thin portion and the thick portion.

  Furthermore, the elastic deformation difficult portion is a high strength portion having a desired strength, and the elastic deformation easy portion is a low strength portion having a lower strength than the high strength portion.

  Thus, a spring device having a desired diameter can be obtained while easily obtaining the elastic deformation difficult portion and the elastic deformation easy portion.

  Furthermore, the high-strength portion and the low-strength portion are characterized by being formed of materials having different strengths.

  Thus, a spring device having a desired diameter can be obtained while easily obtaining the high strength portion and the low strength portion.

  Further, in a cylinder device comprising a cylinder body having a cylinder hole, a piston for partitioning a hydraulic pressure chamber in the cylinder hole of the cylinder body, and a spring device for applying a spring force to the piston, the piston end surface is fitted. As the possible spring device, any one of claims 1 to 7 is provided.

  As a result, the spring device can be fitted to the piston end face, so that the cylinder is not assembled poorly.

It is one Example of the cylinder apparatus (tandem master cylinder) to which the spring apparatus of this invention is applied. It is a cross section of the spring device of the present invention. It is a perspective view of the 1st retainer member. FIG. 4 is a view of the second retainer member as viewed from the direction of arrow A in FIG. 2, that is, the second retainer member after assembly. FIG. 5 is a view of the second retainer 70 in a free state, that is, a second retainer member before assembly viewed from the same direction as FIG.

  FIG. 1 shows an embodiment of a cylinder device to which spring devices 51 and 52 of the present invention are applied. The cylinder device 10 includes a primary portion 101 and a secondary portion 102 which are independent from each other. In the embodiment shown in the figure, the spring devices 51 and 52 of the present invention are incorporated in both the portions 101 and 102.

First, an overall configuration of the cylinder device 10 will be briefly described with reference to FIG. A cylinder device 10 shown in FIG. 1 includes a cylinder body 11 and a reservoir 20 connected to the cylinder body 11.
The primary piston 31 is located near the opening of the cylinder hole 12 of the cylinder body 11, and the secondary piston 32 is arranged in a straight line along the axis of the cylinder hole 12 in the back thereof. A part of the primary piston 31 enters the cylinder hole 12, and the remaining part protrudes outward from the opening of the cylinder hole 12. This protruding side enters the inside of a booster (not shown). In addition, about a booster, it is a well-known thing, The description is abbreviate | omitted about a structure, an action | operation, etc.

  The secondary piston 32 and the primary piston 31 have recesses 13, 14, 15, 16 on both sides in the axial direction, and the recess 16 on the second end 11 b side of the secondary piston 32 is a part of the spring device 52 on the secondary side. The recess 15 on the first end 11a side on the opposite side is a space for receiving a part of the spring device 51 on the primary side. Similarly, the recess 14 on the second end 11b side of the primary piston 31 is a space for receiving a part of the spring device 51 on the primary side, but the recess 13 of the first end 11a of the primary piston 31 is It becomes a space for receiving an output rod (not shown) of a booster (not shown) different from the spring device.

  Next, the structure of the spring devices 51 and 52 will be described with reference to FIG. FIG. 2 is a cross-sectional view of a state in which a first retainer 60, a second retainer 70, and a spring 80, which will be described later, are combined (that is, before being assembled into the cylinder hole 12). The first claw part 62 and the second claw part 72 are in contact with each other by the force of the spring 80 supported between the first claw part 62 and the second claw part 72. Thereby, the spring devices 51 and 52 can be handled independently as one unit.

  In the spring devices 51 and 52 before the assembly, since the first claw portion 62 and the second claw portion 72 are in contact with each other, the spring force of the spring 80 passes through the first claw portion 62 and the second claw portion 72. Join each retainer member 60, 70. For this reason, the retainer members 60 and 70 are required to have a material strength in consideration thereof. From this viewpoint, the material of the retainer members 60 and 70 is preferably a resin mixed with a reinforcing agent. However, as shown in FIG. 1, in the spring devices 51 and 52 after being assembled in the cylinder hole 12, a preload is applied to the spring 80, and the first claw portion 62 and the second claw portion 72 are in the axial direction. Away. Therefore, the force of the spring 80 is only applied to the spring receiving portions 63 and 73 and is not applied to the cylindrical main bodies 61 and 71 of the retainer members 60 and 70. Therefore, it is not necessary to increase the material strength of the retainer members 60 and 70 more than necessary.

FIG. 3 is a perspective view of the first retainer member 60 and basically has the same configuration as that corresponding to the prior art of the present application.
The first retainer member 60 includes a main body 61 having both ends opened in the axial direction. The outer diameter of the main body 61 is smaller than the outer diameter of a main body 71 of a second retainer member 70 described later. A first claw portion 62 is formed at a tip portion that fits against 71, and a slit 64 is formed from the side where the first claw portion 62 is located to the vicinity of the root on the side where the spring receiving portion 63 is located. ing. The slits 64 are formed at two places 180 degrees apart in the circumferential direction. The thickness of the main body 61 of the first retainer member 60 is generally thicker than the thickness of the main body 71 of the second retainer member 70, and the side on which the first claw portion 62 is located is a spring support. It is thicker than the part 63 side.

4 is a view of the second retainer member 70 as viewed from the direction of arrow A in FIG. 2, that is, the second retainer member 70 after assembly, and FIG. 5 is a diagram showing a free state of the second retainer 70, that is, It is the figure which looked at the 2nd retainer member 70 before an assembly | attachment from the same direction as FIG.
In FIG. 4, the elastic retainer portions 76 and the elastic deformable portions 75 are alternately arranged on the second retainer 70 with the slits 74 interposed therebetween.

The configuration of the elastic deformation easy portion 76 and the elastic deformation difficult portion 75 can be achieved, for example, by the following configuration.
The elastic deformation easy part 76 is a thin part having a desired thickness, and the elastic deformation difficult part 75 is a thick part thicker than the thin part. For example, the thin part cuts a part of the spring receiving part. In addition, the thick portion may be formed by forming a thick portion on a part of the spring receiving portion, and this configuration can be easily obtained.

The elastically deformable portions 76 and the elastically deformable portions 75 shown in FIG. 4 are provided two by two, and are disposed in portions facing each other. Three elastic deformation difficult portions 75 may be provided, and may be arranged in portions facing each other.
Further, in FIG. 4, the spring devices 51 and 52 are completed, and a set load is applied to the spring receiving portions 63 and 73, so that the elastically deformable portion 76 is bent, and in this state The inner diameter X of the elastic deformation difficult portion 75 and the inner diameter Y of the elastic deformation easy portion 76 are substantially equal.

  FIG. 5 is a view seen from the same direction as FIG. 4 when the second retainer member 70 shown in FIG. 4 is in a free state. As can be seen from the figure, when the second retainer member 70 is in a free state, the elastically deformable portion 76 is arranged in a state shifted radially outward from the elastically deformable portion 75. That is, the relationship of radius X <radius Y is established, and the slit 74 is disposed in the vicinity of the elastically deformable portion 76 by applying the set load as in the state of FIG. 4 described above. In some cases, the elastically deformable portion 76 is easily bent toward the axial center side, and as a result, the inner diameter X and the inner diameter Y are made substantially equal.

  As a result, as disclosed in FIG. 4, an inner cylinder portion in which the inner diameter X and the inner diameter Y approximate is secured, and the outer diameters of the primary piston 31 and the secondary piston 32 are set to the inner diameter X or the inner diameter Y. By designing, fitting with the spring devices 51 and 52 becomes possible, and assembly failure of the cylinder device 10 and the like are reduced.

In the embodiment for carrying out the invention, the second retainer 70 using the elastically deformable portion 76 and the elastically deformable portion 75 has been described. However, the present invention is not limited to this, and various things can be considered.
For example, the first retainer 60 may also have a configuration corresponding to the elastic deformation easy portion 76 and the elastic deformation difficult portion 75, and the cylinder device 10 is a single master cylinder (clutch master cylinder). You may employ | adopt the spring apparatus of this invention.

Further, the configuration of the elastic deformation difficult portion 75 and the elastic deformation easy portion 76 is not limited to being formed in the thick portion and the thin portion. For example, the elastic deformation difficult portion 75 has a desired strength. The elastically deformable portion 76 may be a low-strength portion having lower strength than the high-strength portion.
In this case, for example, the high strength portion and the low strength portion may be made of materials having different strengths.

  Further, for convenience of explanation, reference numeral 76 is described as an elastically deformable part, and reference numeral 75 is an elastically difficult part. However, reference numeral 76 is replaced with a part not receiving a spring set load, and reference numeral 75 is replaced with a part receiving a spring set load. However, the same effect can be obtained.

Claims (7)

A spring force is applied to a piston that is an internal part of the cylinder hole, and includes a pair of retainer members that engage with each other in a manner that the length in the axial direction can be expanded and contracted, and a spring that is supported by the retainer members, In the spring device unitized separately from the piston so that it can be handled independently,
The pair of retainers have a cylindrical shape with a hollow portion therein, and a spring receiving portion that receives an end portion of the spring is formed. The spring receiving portion relatively sets a set load of the spring. The portions that receive strongly and the portions that receive relatively weakly as compared to the portion that receives strongly are alternately arranged, and the spring is set on the pair of retainer members, so that the set load is relatively A spring device characterized in that an inner diameter or an outer diameter of an opening end portion of the hollow portion of the strongly receiving portion approximates an inner diameter or an outer diameter of the opening end portion of the hollow portion of the relatively weakly receiving portion. The spring receiving part is formed to project radially outward from the main body part of the pair of retainer members, and the part that receives the set load of the spring relatively weakly is a thin part having a desired thickness, The spring device according to claim 1, wherein the portion that receives the set load of the spring relatively strongly is a thick portion that is thicker than the thin portion. The portion that receives the set load of the spring strongly is a portion that is difficult to be elastically deformed, and the portion that receives the set load of the spring weakly is more elastic than the portion that is difficult to elastically deform. The spring device according to claim 2, wherein the spring device is an easily deformable portion. The spring device according to claim 3, wherein the elastically deformable part is a thin part having a desired thickness, and the elastically deformable part is a thick part thicker than the thin part. The elastic deformation difficult portion is a high strength portion having a desired strength, and the elastic deformation easy portion is a low strength portion having a lower strength than the high strength portion. The spring device as described. The spring device according to claim 5 , wherein the high-strength portion and the low-strength portion are formed of materials having different strengths. In a cylinder device comprising a cylinder body having a cylinder hole, a piston that partitions a hydraulic pressure chamber in the cylinder hole of the cylinder body, and a spring device that applies a spring force to the piston,
A cylinder device comprising the spring device according to any one of claims 1 to 6 as the spring device that can be fitted to the piston end face.

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