JP3221229U - Spring unit - Google Patents

Abstract

The present invention provides a spring unit which makes it easy to select an optimum spring unit and which does not require adjustment of the entire length. A spring unit includes a first member (10), a second member (20), a spring (30), and a bolt (40). The first member has a hole (13) and a first surface (15) with which one end of the spring contacts. The second member has a female screw portion 23 and a second surface 25 with which the other end of the spring is in contact, and the bolt has a male screw portion 43 coupled to the female screw portion and a shaft 42 inserted into the hole The shaft portion abuts on the second member, and in the initial state, the length from the first surface to the second surface is shorter than the free length of the spring. [Selected figure] Figure 1

Description

  The present invention relates to a spring unit, and more particularly to a spring unit suitable as a spring used for a press die.

  Conventionally, a first member, a second member, a spring, and a bolt are provided, and the first member has a hole and a first surface with which one end of the spring contacts, and the second member is a female screw, There is known a spring unit having a second surface in contact with the other end of the spring, and the bolt having an external thread portion coupled to the internal thread portion, and a shaft portion inserted into the hole portion Reference 1).

  However, since the conventional spring unit is configured to adjust the initial load (the amount of deflection of the spring) by rotating the bolt, in the initial state (that is, in a state where no external force is applied to the spring unit). The amount of deflection of the spring may change. In addition, the overall length of the spring unit also changes with the adjustment of the initial load. Therefore, for example, in the design of a press die, in the case where a spring having a predetermined deflection amount is to be disposed in a space having a predetermined height, selection of a spring unit tends to be difficult. In addition, it is inconvenient because the entire length of the spring unit must be adjusted before the spring unit is installed in a press die or the like.

Japanese Patent Laid-Open No. 2000-000700

  The problem to be solved by the present invention is to make it easy to select an optimum spring unit and to provide a spring unit that does not require adjustment of the overall length.

  In order to solve the above problems, the present invention includes a first member, a second member, a spring, and a bolt, and the first member has a hole and a first surface with which one end of the spring contacts. The second member has a female screw portion and a second surface in contact with the other end of the spring, and the bolt has a male screw portion coupled to the female screw portion and a shaft portion inserted into the hole. The shaft portion is in contact with the second member, whereby in an initial state, a length from the first surface to the second surface is shorter than a free length of the spring. Provide a spring unit.

  In the spring unit of the present invention, the shaft portion of the bolt abuts on the second member, whereby in the initial state, the length from the first surface of the first member to the second surface of the second member is the spring Shorter than free length. Therefore, in the initial state, the spring is configured to be bent by a predetermined amount. Since the amount of deflection of the spring in the initial state depends on the length of the shaft of the bolt, it is possible to provide the spring set to a constant amount of deflection by setting the length of the shaft of the bolt constant. It is possible. Therefore, when designing a press die or the like, the deflection amount of the spring can be known in advance, so that an optimum spring unit can be selected. Further, since the entire length of the spring unit in the initial state does not change, it is not necessary to adjust the length of the spring unit before installation.

FIG. 1 is a cross-sectional view of a spring unit according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a spring unit according to an embodiment of the present invention attached to a press die. FIG. 3 is a cross-sectional view showing a state in which the spring is compressed.

  Hereinafter, although the form for carrying out the present invention is explained more concretely based on the example of the present invention, the technical scope of the present invention is not limited to the contents of the following explanation.

  As shown in FIG. 1, the spring unit according to the embodiment includes a first member 10, a second member 20, a spring 30, and a bolt 40.

  The first member 10 includes a cylindrical portion 11 and a flange 12 projecting outward from the cylindrical portion 11. The hole 13 formed in the first member 10 is a hole which penetrates the center of the cylindrical portion 11 in the axial direction. The outer end surface of the flange 12 functions as a first abutment surface 14 (ie, the surface in contact with the installation subject of the spring unit), and the inner end surface of the flange 12 forms a first surface 15 (ie, one end of the spring 30). Function as a supporting surface).

  The second member 20 includes a cylindrical portion 21 and a flange 22 protruding outward from the cylindrical portion 21. The female screw portion 23 formed in the second member 20 is a portion in which a female screw is formed in a hole which penetrates the center of the cylindrical portion 21 in the axial direction. The outer end surface of the flange 22 functions as a second contact surface 24 (that is, the surface that contacts the installation subject of the spring unit), and the inner end surface of the flange 22 is a second surface 25 (that is, the other end of the spring 30). Function as a supporting surface).

  The spring 30 is a compression coil spring. One end of the spring 30 is in contact with the first surface 15 and supported by the first surface 15. The other end of the spring 30 is in contact with the second surface 25 and supported by the second surface 25. In order to apply an initial load to the spring 30, a spring 30 having a free length (i.e., a length with no load applied) longer than the initial length L2 (see FIG. 1) is used.

  The bolt 40 is configured to have a head 41, a shaft 42 extending from the head 41, and an external thread 43 extending from the shaft 42. The outer diameter of the shaft portion 42 is larger than the outer diameter of the male screw portion 43. The male screw portion 43 is a portion in which a male screw is formed on a shaft having a diameter smaller than that of the shaft portion 42. The shaft portion 42 is inserted into the hole portion 13, and the male screw portion 43 is coupled to the female screw portion 23. In an initial state (that is, a state in which no external force is applied to the spring unit), the shaft portion 42 is in contact with the second member 20 (the cylindrical portion 21).

  The spring unit according to the embodiment is in an initial state by connecting the male screw 43 of the bolt 40 to the female screw 23 of the second member 20 until the shaft 42 of the bolt 40 abuts on the cylinder 21 of the second member 20. The length L 2 from the first surface 15 to the second surface 25 is shorter than the free length of the spring 30. Therefore, in the initial state, the spring 30 is bent by a predetermined amount (for example, 2 mm). Since the amount of deflection of the spring 30 in the initial state depends on the length L3 of the shaft portion 42 of the bolt 40, the constant amount of deflection is set by setting the length of the shaft portion 42 of the bolt 40 constant. It is possible to provide a spring 30.

  In the spring unit according to the embodiment, the length L1 from the first contact surface 14 of the first member 10 to the second contact surface 24 of the second member 20 is the length L3 of the shaft 42 of the bolt 40. And the axial length L4 of the second member 20. Therefore, the entire length of the spring unit in the initial state (that is, the length L1 from the first contact surface 14 to the second contact surface 24) does not change constantly.

  According to the spring unit according to the embodiment, as described above, since the entire length of the spring unit is constant and a constant initial load is applied in the initial state, it is optimal in designing a press die or the like. Spring unit can be selected. In addition, it is not necessary to adjust the length of the spring unit before installation.

  The application of the spring unit according to the embodiment is not limited in any way, but the spring unit according to the embodiment is suitable, for example, as a spring used for a press die.

  As shown in FIG. 2, when the spring unit according to the embodiment is assembled into a press die, the first contact surface 14 is brought into contact with the upper plate 51 constituting the press die, and the second contact surface 24 is It abuts on the lower plate 52 constituting the press die.

  The head 41 of the bolt 40 is disposed in a hole 53 formed in the top plate 51 to allow the top plate 51 to move up and down.

  In order to prevent the spring unit from falling down, the first member 10 is disposed in a hole 55 formed in a packing plate 54 which is guided by a guide member (not shown) and moves up and down together with the upper plate 51; The second member 20 is preferably disposed in a hole 57 formed in a fixing plate 56 fixed to the lower plate 52.

  When a plurality of spring units are disposed under the upper plate 51, the total length in the initial state of each spring unit (the length L1 from the first abutment surface 14 to the second abutment surface 24) is different. In order to adjust the height, it is necessary to make the upper plate 51 or the lower plate 52 counterbored or provide a spacer. However, since the length L1 from the 1st contact surface 14 to the 2nd contact surface 24 is constant in the initial state in the spring unit which concerns on an Example, height adjustment is unnecessary. Therefore, as described above, the spring unit can be effectively prevented from falling simply by providing the through holes 55 and 57 in the packing plate 54 and the fixing plate 56, respectively. The processing of the through holes can be carried out at low cost as compared with the case of providing a counterbore, providing a spacer, or fixing using a screw. Therefore, the spring unit according to the embodiment has an advantage of low installation cost.

  In the spring unit according to the embodiment, the male screw portion 43 of the bolt 40 is coupled only to the female screw portion 23 of the second member 20 and is not coupled to the lower plate 52. Therefore, since it is easy to attach and remove, there is also an advantage that disassembly and assembly of the press die at the time of maintenance can be easily performed.

  In order to prevent breakage of the bolt 40, the spring unit according to the embodiment is preferably installed so that the first member 10 does not contact the head 41 of the bolt 40 when the upper plate 51 moves up and down.

  In the spring unit installed as described above, the spring 30 is compressed as the upper plate 51 descends, as shown in FIG.

  In the progressive type press die, the pressure of the press is adjusted using the springs 30 having different elastic forces. In this case, the elastic force of the springs 30 causes the first contact surface 14 in the initial state to be second If the length L1 to the abutment surface 24 and the amount of deflection of the spring 30 in the initial state are different, it is necessary to adjust the individual spring units, which takes time and effort. Therefore, it is preferable that the length L1 from the first contact surface 14 to the second contact surface 24 in the initial state be constant regardless of the elastic force of the spring 30. Moreover, it is preferable that the deflection amount of the spring 30 in the initial state is also constant regardless of the elastic force of the spring 30. According to such a configuration, adjustment for each spring unit is not necessary, and installation becomes easy.

DESCRIPTION OF SYMBOLS 10 1st member 11 cylinder part 12 flange 13 hole part 14 1st contact surface 15 1st surface 20 2nd member 21 cylinder part 22 flange 23 female screw part 24 2nd contact surface 25 2nd surface 30 spring 40 bolt 41 head 42 shaft portion 43 male screw portion 51 upper plate 52 lower plate 53 hole 54 packing plate 55 hole 56 fixing plate 57 hole

Claims (1)

  A first member includes a first member, a second member, a spring, and a bolt, and the first member has a hole and a first surface with which one end of the spring contacts, and the second member includes an internal thread portion, and The bolt has a second surface in contact with the other end of the spring, the bolt has an external thread portion coupled to the internal thread portion, and a shaft portion inserted into the hole, and the shaft portion is attached to the second member A spring unit characterized in that it abuts, whereby in the initial state the length from the first surface to the second surface is less than the free length of the spring.

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