JPH0734229U - Layered leaf springs such as elastic joints - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent fretting. [Structure] The leaf spring 4 is sandwiched between the intermediate pieces 2 and 2, and the outer end portion is fixed to the intermediate piece 2. A gap G is formed between the spacer shim 6 and the spring plate 5 at the outer end portion of the leaf spring 4 where fretting occurs. Since the gap G prevents the spring plate 5 and the spacer shim 6 from rubbing against each other when the elastic joint or the like is operated, fretting is prevented.
The gap G can be formed by providing a groove 6a in the spacer shim 6 or by forming another spacer between the spring plate 5 and the spacer shim 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a leaf spring used in elastic joints and dynamic dampers.

[0002]

[Prior art]

 As an elastic joint for transmitting torque or a damper for absorbing torsional vibration, an inner star is rotatably fitted relative to the substrate in the center of the substrate on which a large number of intermediate pieces are radially arranged. It is known that a leaf spring is sandwiched between each intermediate piece to fix the outer end portion of the leaf spring, and the inner end portion of the leaf spring is fixed to the groove of the inner star (actual fair 2). -32911). The above-mentioned conventional leaf springs radially provided between the substrate and the inner star have a structure in which a spacer shim made of a metal different from the spring leaf is closely contacted and sandwiched between a pair of metal spring leafs. The elastic joint bends in the stacking direction of the spring plate and the spacer shim to transmit torque, and the damper absorbs torsional vibration.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional leaf springs such as elastic joints, the spring leaf and the spacer shim rub each time they are bent, so that the contact surfaces of each other gradually become rough and fretting that causes minute cracks occurs, and finally the cracks occur. There is an inconvenience of cutting off at the starting point. Although lubricating oil is supplied to the leaf springs, fretting occurs at the outer end portion of the leaf springs where the leaf spring is fixed to the intermediate piece and lubrication is difficult.

An object of the present invention is to provide a leaf spring such as an elastic joint that can prevent fretting from occurring.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a leaf spring such as an elastic joint according to claim 1 is sandwiched between intermediate pieces radially provided on a base plate, and its outer end is fixed to the intermediate piece. In a leaf spring, such as an elastic joint, whose inner end is attached to an inner star that is rotatably provided in the center of the board, the spacer shim and the spacer shim are sandwiched. A gap is formed between the outer end portions of the spring plate that constitutes the leaf spring.

Further, in the leaf spring such as the elastic joint according to the second aspect, in the invention according to the first aspect, the gap is formed by the groove provided in the spacer shim.

Further, in the laminated leaf spring such as the elastic joint according to the third aspect, in the invention according to the first aspect, the gap is formed by the spacer sandwiched between the spring plate and the spacer shim.

[0008]

[Action]

 During operation of the leaf spring, the spring plate and the outer end portion of the spacer shim do not rub against each other due to the gap, so fretting is prevented.

[0009]

【Example】

 1 to 3 show an embodiment of the present invention. In these figures, reference numeral 1 is a substrate. The substrate 1 has a circular shape, and a large number of intermediate pieces 2 are radially fixed to the outer peripheral portion of the substrate 1. A circular inner star 3 is provided in the center of the substrate 1 by being fitted to the intermediate piece 2. The substrate 1 and the inner star 3 are concentric with each other, and the inner star 3 is rotatable relative to the substrate 1 in the circumferential direction. Note that, in FIG. 1, the substrate 1 and the like are depicted only in a range of 90 degrees, and other portions are omitted.

Reference numeral 4 is a leaf spring. Each leaf spring 4 is composed of a pair of spring plates 5 and 5 and a spacer shim 6 sandwiched between the spring plates 5 and 5. The portion is fixed to the intermediate piece 2 and the inner end portion is engaged with the groove 3a formed on the outer peripheral surface of the inner star 3. Each of the leaf springs 4 bends in the stacking direction of the spring plates 5, 5 and the spacer shim 6 to transmit torque or absorb torsional vibration by relative rotation of the inner star 3 with respect to the substrate 1.

Both the spring plate 5 and the spacer shim 6 are made of metal, but their materials are usually different from each other. Grooves 6a, 6a are provided in the spacer shim 6 at the outer end portion of the leaf spring 4 where fretting occurs, and a gap G is formed between the spring leaf 5 and the spacer shim 6 in this portion by the groove 6a.

Since the gap G is for avoiding contact between the spring plate 5 and the spacer shim 6, its size may be several microns, but in actuality it is 0.1 to 0.5 due to machining. It is about mm. Further, since the width in the lengthwise direction of the leaf spring 4 in which fretting occurs depends on the contact pressure between the spring plate 5 and the spacer shim 6 and the amount of bending, the gap G is empirically determined by its elastic joint or the like. Form within the range that causes fretting computationally.

The inner star 3 is radially provided with a large number of circulation holes 3b for supplying lubricating oil to the portion of the leaf spring 4, and an oil pipe 7 is fitted in each circulation hole 3b. The oil pipe 7 prevents the sludge S 1 accumulated by the centrifugal force near the inner peripheral surface of the inner star 3 from flowing to the portion of the leaf spring 4.

The laminated leaf spring such as the elastic joint according to the present invention having the above-described structure is bent during operation of the elastic joint and transmits torque, or absorbs torsional vibration. However, at this time, the portions where the gap G is formed between the mesh plate 5 and the spacer shim 6 do not rub against each other, so that fretting is prevented, and the service life of the elastic joint or the like increases accordingly. Since the gap G improves the flow of the lubricating oil and allows the lubricating oil to permeate the peripheral portion of the gap G, the occurrence of fretting is also prevented in this respect.

FIG. 4 shows another embodiment of the present invention. In this embodiment, a spacer 8 is inserted between the spring plate 5 and the spacer shim 6 to form a gap G. The size and width of the gap G are almost the same as above, but the strength of the spacer 8 itself is also taken into consideration. The operation of the leaf spring 4 and the overall structure of the elastic joint and the like are the same as those in the above-mentioned embodiment. The material of the spacer 8 may be the same as that of the spring plate 5 or the spacer shim 6, or may be different from that of both members 5, 6.

[0016]

[Effect of device]

 As described above, the leaf springs such as the elastic joint according to the present invention are sandwiched between the intermediate pieces radially provided on the substrate and the outer ends are fixed to the intermediate piece, and the central portion of the substrate is fixed to the substrate. In a laminated leaf spring such as an elastic joint having an inner end portion engaged with an inner star that is relatively rotatable with respect to each other, a spring leaf that constitutes a laminated leaf spring by sandwiching a spacer shim and the spacer shim. Since a gap is formed between the outer end parts of the spring plate, the spring plate and the spacer shim do not rub against each other in the part where the gap is formed, and therefore fretting is prevented from occurring. You can

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a leaf spring such as an elastic joint according to the present invention.

FIG. 2 is a detailed sectional view of a portion II of FIG.

FIG. 3 is a sectional view of an oil pipe portion of an inner star.

FIG. 4 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Substrate 2 Intermediate Piece 3 Inner Star 3a Groove 3b Circulation Hole 4 Stacked Leaf Spring 5 Spring Plate 6 Spacer Shim 7 Oil Pipe 8 Spacer G Gap

Front page continuation (72) Jiro Maehara 1-1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo MHI Diesel Service Co., Ltd. Kamito branch office (72) Kotaro Kishimoto Wadazaki, Hyogo-ku, Kobe-shi, Kobe 1-1-1 Machi MHI Diesel Service Co., Ltd. Kamido Branch

Claims (3)

[Scope of utility model registration request] 1. An inner star which is sandwiched between intermediate pieces radially provided on a substrate and whose outer end is fixed to the intermediate piece, and which is provided at the center of the substrate so as to be rotatable relative to the substrate. In a laminated leaf spring such as an elastic joint provided with its inner end fastened to, a gap is formed between a spacer shim and an outer end portion of a spring plate that constitutes the laminated leaf spring by sandwiching the spacer shim. Laminated leaf springs such as elastic joints. 2. A leaf spring such as an elastic joint according to claim 1, wherein the gap is formed by a groove provided in the spacer shim. 3. A leaf spring such as an elastic joint according to claim 1, wherein the gap is formed by a spacer sandwiched between the spring plate and the spacer shim.