Dry friction base material, dry friction material, torque limiting device, and fixing structure of dry friction base material

Abstract

The present invention aims to provide a dry friction base material, a dry friction material, a torque limiter, and a fixing structure for a dry friction base material, which can ensure a stable friction coefficient. The dry friction base material 1 is fixed to the surface of a plate 6 for a torque limiter, and has a fixed shape portion 2 for fixation. The shape of the fixed shape portion is preferably concave, convex, or notched. Furthermore, the shape of the dry friction base material in plan view is preferably circular, elliptical, polygonal, or arcuate.

Description

Technical Field

[0001] This invention relates to a dry friction substrate, a dry friction material, a torque limiting device, and a fixing structure for the dry friction substrate. Background Technology

[0002] Previously, torque limiting devices are commonly known to be installed in vehicles such as hybrid vehicles. These devices provide stable torque transmission and torque suppression when excessive torque is generated (i.e., protection of the unit). Therefore, the dry friction material used in the torque limiting device needs to ensure a stable coefficient of friction. As a dry friction material, products comprising an annular plate and an annular dry friction substrate fixed to the plate are generally known (see, for example, Patent Document 1, etc.). To further reduce costs, a technique is currently being researched that arranges multiple segmented dry friction substrates along the circumference of the plate.

[0003] Here, Patent Documents 2-6 disclose a technique for arranging multiple segmented dry friction substrates along the circumferential direction of a plate. Specifically, they disclose a technique of forming multiple arc-shaped through holes on the outer periphery of an annular plate, and pressing the arc-shaped ends of a dry friction substrate, which is thicker than the plate, into each through hole. Furthermore, Patent Documents 2-5 also propose a method that simplifies the process and allows for cost-effectiveness by eliminating the need to fix the dry friction substrate to the plate with rivets or to bond it to the plate.

[0004] Patent documents Patent Document 1: Japanese Patent Application Publication No. 2020-148335; Patent Document 2: Japanese Patent Application Publication No. 2011-027122; Patent document 3: Japanese Patent Application Publication No. 2010-286044; Patent document 4: Japanese Patent Application Publication No. 2010-286043; Patent document 5: Japanese Patent Application Publication No. 2011-047470; Patent document 6: DE102020126855A1. Summary of the Invention

[0005] However, in the technologies disclosed in Patent Documents 2-6, in order to fix the segmented dry friction substrate to the plate, the two ends of the arc-shaped dry friction substrate, which is thicker than the plate, are pressed into the through holes of the plate and fitted together. Therefore, the through holes and the dry friction substrate need to be machined into the same arc shape, requiring highly precise and costly processing. In particular, high machining precision is required for the two ends of the arc-shaped dry friction substrate and the through holes. That is, if the machining precision of the two ends of the arc-shaped dry friction substrate and the through holes is low, high pressure will be applied to the end face of the dry friction substrate in the arc direction when fixing it to the plate, posing a risk of damage to the end face. As a result, it is difficult to ensure a stable coefficient of friction, and the torque limiting device cannot perform its proper torque transmission and torque suppression functions.

[0006] The present invention was made in view of the above-mentioned actual situation, and its purpose is to provide a dry friction substrate, a dry friction material, a torque limiting device, and a fixing structure for the dry friction substrate that can ensure a stable coefficient of friction when the dry friction substrate is segmented.

[0007] This invention includes the following inventions.

[0008] (1) A dry friction substrate, which is a dry friction substrate fixed on the surface of a plate for a torque limiting device, characterized in that it has a fixed shape portion for performing the above-mentioned fixing.

[0009] (2) The dry friction substrate as described in (1) above, wherein the shape of the fixed shape portion is concave, convex or slit.

[0010] (3) The dry friction substrate as described in (1) or (2) above, wherein the shape of the dry friction substrate when viewed from above is circular, elliptical, polygonal or arc-shaped.

[0011] (4) The dry friction substrate described in any one of (1) to (3) above, wherein the dry friction substrate is button-shaped and has the fixed shape portion provided at the center.

[0012] (5) The dry friction substrate as described in (1) or (2) above, wherein the dry friction substrate is fan-shaped and has the fixed shape portion provided at both ends.

[0013] (6) A dry friction material, characterized in that it comprises a plate for a torque limiting device and a dry friction substrate fixed on the surface of the plate, wherein the plate has a fixing shape portion on the surface for fixing, and the dry friction substrate has a fixing shape portion that engages with the fixing shape portion.

[0014] (7) The dry friction material as described in (6) above, wherein the shape of the fixed shape portion is convex or concave.

[0015] (8) The dry friction material as described in (6) or (7) above, wherein the shape of the plate when viewed from above is annular, and a plurality of the dry friction substrates are provided in a manner parallel to the inner or outer periphery of the plate.

[0016] (9) The dry friction material as described in (8) above, wherein the dry friction substrates are arranged at equal intervals.

[0017] (10) The dry friction material described in any one of (6) to (8) above, wherein one of the above-mentioned dry friction substrates is fixed in one of the above-mentioned fixed shape portions.

[0018] (11) The dry friction material described in any one of (6) to (8) above, wherein one of the dry friction substrates is fixed to the plurality of fixed shapes by the fixed shape portion.

[0019] (12) A torque limiting device comprising a dry friction material, characterized in that the dry friction material comprises a plate having an annular shape when viewed from above, and a dry friction substrate fixed to the surface of the plate, the plate having a fixing shape portion for fixing on the surface, and the dry friction substrate having a fixed shape portion engaging with the fixing shape portion.

[0020] (13) The torque limiting device as described in (12) above, wherein the dry friction substrate is provided in a plurality of such a manner parallel to the inner or outer periphery of the plate.

[0021] (14) The torque limiting device as described in (13) above, wherein the dry friction substrates are arranged at equal intervals.

[0022] (15) The torque limiting device as described in any of (12) to (14) above, wherein the plate is a cover plate or a push plate.

[0023] (16) The torque limiting device as described in (15) above, wherein the cover plate and the push plate are arranged such that the surfaces on which the dry friction substrate is fixed are facing each other, and the friction plate is disposed between the cover plate and the push plate in a state of contact with the dry friction substrate.

[0024] (17) A fixing structure for a dry friction substrate, wherein the dry friction substrate is fixed to the surface of a plate for a torque limiting device, characterized in that a fixing shape portion formed in a convex or concave shape is provided on the surface of the plate for fixing, and a fixed shape portion in a shape that engages with the fixing shape portion is provided on the dry friction substrate, wherein the dry friction substrate is fixed to the surface of the plate by the engagement relationship between the fixing shape portion and the fixed shape portion.

[0025] (18) The fixing structure of the dry friction substrate as described in (17) above, wherein the dry friction substrate is not joined to the plate, but is fixed only by the above-mentioned interlocking relationship.

[0026] (19) The fixing structure of the dry friction substrate as described in (17) or (18) above, wherein the dry friction substrate is formed in the shape of a button and has the fixing shape portion provided in the center, and one of the dry friction substrates is fixed to one of the fixing shape portions by means of the fixing shape portion.

[0027] (20) The fixing structure of the dry friction substrate as described in any of (17) to (19) above, wherein the dry friction substrate is formed in the shape of a fan and has the fixing shape portion provided at both ends, and the dry friction substrate is fixed to a plurality of the fixing shape portions by means of the fixing shape portion.

[0028] According to the present invention, a stable coefficient of friction can be ensured when the dry friction substrate is segmented. Attached Figure Description

[0029] [ Figure 1 [A schematic diagram illustrating the dry friction substrate of Example 1, (a) represents a top view, (b) represents a cross-sectional view along line b–b, and (c) represents a perspective view.]

[0030] [ Figure 2 [A schematic diagram illustrating a molding die used to form a dry friction substrate is shown. (a) represents a top view, and (b) represents a cross-sectional view along line b–b.]

[0031] [ Figure 3 [Schematic diagrams illustrating other forms of dry friction substrates, (a) shows an elliptical shape when viewed from above, and (b) to (d) show polygonal shapes when viewed from above.]

[0032] [ Figure 4 [ ] is a schematic diagram further illustrating other forms of dry friction substrate, (a) showing the form of the fixed shape portion having a through hole, and (b) and (c) showing the form of the fixed shape portion having a convex shape.

[0033] [ Figure 5 [A schematic diagram illustrating the dry friction material of Example 1, (a) represents a top view and (b) represents a cross-sectional view along line b–b.]

[0034] [ Figure 6 [A schematic diagram illustrating the dry friction material of Example 1, (a) represents a top view and (b) represents a cross-sectional view along line b–b.]

[0035] [ Figure 7 [Schematic diagrams illustrating other forms of dry friction materials, (a) and (b) show the configuration of dry friction substrates arranged on multiple circumferences of a plate, (c) shows the configuration of a portion of the dry friction substrates offset from the circumference, and (d) shows the configuration of a portion of the dry friction substrates arranged at unequal intervals in the circumferential direction.]

[0036] [ Figure 8 This is a schematic diagram illustrating the torque limiting device of Embodiment 1 (exploded perspective view).

[0037] [ Figure 9 This is a schematic diagram illustrating the torque limiting device (longitudinal sectional view in the assembled state).

[0038] [ Figure 10 [A schematic diagram illustrating the dry friction substrate of Example 2, (a) represents a top view, (b) represents a cross-sectional view along line b–b, and (c) represents a perspective view.]

[0039] [ Figure 11 [A schematic diagram illustrating a molding die used to form a dry friction substrate is shown. (a) represents a top view, and (b) represents a cross-sectional view along line b–b.]

[0040] [ Figure 12 [Schematic diagrams illustrating other forms of dry friction substrates, (a) shows a form with a concave fixed shape, (b) shows a form with a through hole, (c) and (d) show forms with a convex fixed shape, and (e) shows a form with fixed shapes at both ends and in the middle in the arc direction.]

[0041] [ Figure 13 [A schematic diagram illustrating the dry friction material of Example 2, (a) represents a top view and (b) represents a cross-sectional view along line b–b.]

[0042] [ Figure 14 [A schematic diagram illustrating the dry friction material of Example 2, (a) represents a top view and (b) represents a cross-sectional view along line b–b.]

[0043] [ Figure 15[Schematic diagrams illustrating other forms of dry friction materials, (a) and (b) show the configuration of dry friction substrates arranged on multiple circumferences of a plate, (c) shows the configuration of a portion of the dry friction substrates deviating from the circumference, and (d) shows the configuration of all dry friction substrates arranged at unequal intervals in the circumferential direction.]

[0044] [ Figure 16 This is a schematic diagram illustrating the torque limiting device of Embodiment 2 (exploded perspective view).

[0045] [ Figure 17 This is a schematic diagram illustrating the torque limiting device (longitudinal sectional view in the assembled state). Detailed Implementation

[0046] The present invention will now be described with reference to the accompanying drawings. The items shown herein are exemplary and intended to illustrate embodiments of the invention. The purpose of these descriptions is to provide a description that is considered most effective and readily understood of the principles and conceptual features of the invention. In this regard, these descriptions are necessary for a fundamental understanding of the invention and are not intended to depict excessive structural details, but rather to clarify, through description in conjunction with the accompanying drawings, how several embodiments of the invention are actually implemented.

[0047] [1] Dry friction substrate In this embodiment, the dry friction substrates 1 and 21 are, for example, as shown in... Figure 1 as well as Figure 10 As shown, the dry friction substrates 1 and 21 are fixed on the surfaces of plates 6 and 26 for torque limiting devices, characterized in that they have fixed shape portions 2 and 22 for fixing.

[0048] There are no particular limitations on the shape and material of the dry friction substrates 1 and 21. The shape of the dry friction substrates 1 and 21 in top view can be, for example, circular, elliptical, polygonal, or arc-shaped (see...). Figure 1 , Figure 3 as well as Figure 10 Furthermore, there is no particular limitation on the thickness t of the dry friction substrates 1 and 21, and for example, 2.0 to 2.6 mm (preferably 2.3 to 2.5 mm) can be used. Additionally, the dry friction substrates 1 and 21 can be made of rubber containing heat-resistant reinforcing fibers such as glass fiber. Furthermore, the dry friction substrates 1 and 21 can also be rovings (dry friction substrates made of glass roving), and from the viewpoint of shape freedom and strength, molded products are preferred.

[0049] As a dry friction substrate 1, it can, for example, take the form of a button with a fixed shape portion 2 provided in the center (see...). Figure 1 as well as Figure 4 The dry friction substrate 1 can be obtained by molding using a molding die 16. Specifically, the molding die 16 includes a preparatory cavity 17 for receiving the compound M, a molding cavity 18 for molding the precursor (pre-vulcanization excipient) that will form the dry friction substrate 1, and a flow channel 19 connecting the preparatory cavity 17 and the molding cavity 18 (see [link to documentation]). Figure 2 The compound M (a compound containing uncured rubber, heat-resistant reinforcing fibers, friction modifiers, etc.) is housed in the preparation cavity 17, and by molding, the compound M is moved from the preparation cavity 17 to the molding cavity 18 via the flow channel 19, forming the precursor and vulcanizing the precursor, thereby obtaining the dry friction substrate 1. It should be noted that "button shape" refers to a small sheet-like shape with a specified thickness. More specifically, it is the ratio of the maximum length in top view to the thickness t in side view (see...). Figure 1 (b) Larger shapes. For example, with a thickness t of 2.4 mm, the maximum diameter can be between 8 mm and 30 mm. There are no limitations on the shape when viewed from above; for example, circles, ellipses, polygons, arcs, etc., can be used (see [reference]). Figure 1 as well as Figure 3 ).

[0050] There are no particular limitations on the number or arrangement of the cavities 17 and 18 and the runners 19 in the molding die 16. For example, one molding cavity 18 can be connected to one runner 19, or multiple runners 19 can be connected. In addition, adjacent molding cavities 18 can be connected to each other. Furthermore, the molding cavities 18 can be located not only on one side of the preparatory cavity 17, but also on both sides.

[0051] As a dry friction substrate 21, it can be, for example, fan-shaped when viewed from above and with fixed shape portions 22 at both ends (see...). Figure 10 as well as Figure 12 This dry friction substrate 21 can be obtained, for example, by molding using a molding die 36. Specifically, a compound (containing unvulcanized rubber, heat-resistant reinforcing fibers, friction modifiers, etc.) that has been extruded using an extruder or the like is housed in the molding cavity 38 of the molding die 36 (see [link to mold cavity]). Figure 11 The precursor (excipient before vulcanization) that will become the dry friction substrate 21 is formed by molding and then vulcanizing the precursor to obtain the dry friction substrate 21. However, a ring-shaped dry friction substrate can also be formed by impregnating glass roving (glass fiber bundles) with resin and applying a rubber coating, and the ring-shaped dry friction substrate is cut to obtain the dry friction substrate 21. The cutting of the ring-shaped dry friction substrate 21 can be performed after molding using a molding die and before heat treatment, or it can be performed after heat treatment.

[0052] There are no particular limitations on the shape and size of the fan-shaped dry friction substrate 21. The fan-shaped angle θ can be, for example, 15 to 180 degrees (preferably 30 to 90 degrees) (see...). Figure 10 (a)).

[0053] There are no particular limitations on the shape of the fixed shape parts 2 and 22; for example, a concave shape can be used (see...). Figure 1 , Figure 12 (a)), convex (see also) Figure 4 (b) Figure 4 (c) Figure 12 (c) Figure 12 (d)), cut shape (see Figure 10 , Figure 4 (c) Figure 12 (e) , Through-hole shape (see Figure 4 (a) Figure 12 (b) etc. (see Figure 1 , Figure 4 , Figure 10 as well as Figure 12 The depth d1 of the concave shape is not particularly limited, and for example, it can be 1.2 mm or more (preferably 1.5 to 1.7 mm). Furthermore, the depth d1 of the concave shape can be less than or equal to the thickness t of the dry friction substrates 1 and 21. When the depth d1 of the concave shape is the same as the thickness t of the dry friction substrates 1 and 21, the fixed shape portions 2 and 22 are typically through holes. The height h1 of the convex shape is not particularly limited, and for example, it can be 1.0 to 2.0 mm (preferably 1.1 to 1.3 mm). Furthermore, the shape of the fixed shape portions 2 and 22 when viewed from above can be, for example, circular, elliptical, polygonal, or arc-shaped.

[0054] For a button-shaped dry friction substrate 1, a recessed, through-hole-shaped, or convex fixed shape portion 2 may be provided at the center of the bottom surface (see...). Figure 1 as well as Figure 4 From the perspective of stability, concave or convex shapes are preferred.

[0055] For a fan-shaped dry friction substrate 21, for example, slit-shaped fixed-shape portions 22 may be provided on both ends in the arc direction (see...). Figure 10 Furthermore, concave shapes can be provided on the bottom surfaces at both ends in the arc direction (see...). Figure 12 (a)) Through-hole shape (see Figure 12 (b) convex fixed shape portion 22 (see Figure 12 (c) and Figure 12 (d))(See also Figure 12 From the perspective of stability, the preferred shape is a cut-out shape, a concave shape, or a convex shape.

[0056] The fan-shaped dry friction substrate 21 may have a fixed shape portion 22 only at both ends in the arc direction, or it may have one or more fixed shape portions 22 in the middle part of the arc direction on the bottom surface in addition to the two ends (see...). Figure 12 (e)).

[0057] [2] Dry friction materials In this embodiment, the dry friction materials 5 and 25 are, for example, as... Figure 5 , Figure 6 , Figure 13 as well as Figure 14 As shown, the feature is that it includes plates 6 and 26 for torque limiting devices, and dry friction substrates 1 and 21 fixed on the surfaces of plates 6 and 26. Plates 6 and 26 have fixing shapes 7 and 27 on their surfaces for fixing, and dry friction substrates 1 and 21 have fixing shapes 2 and 22 that engage with fixing shapes 7 and 27.

[0058] It should be noted that the dry friction substrates 1 and 21 constituting the dry friction materials 5 and 25 may, for example, be the dry friction substrates 1 and 21 described in [1] above.

[0059] There are no particular limitations on the shape of the fixed shape parts 7 and 27; for example, they can be convex, concave, or through-hole shaped (see [reference]). Figure 1 , Figure 4 , Figure 10 as well as Figure 12 The height h2 of the convex shape is not particularly limited, and can be, for example, 1.0 to 2.0 mm (preferably 1.1 to 1.3 mm). Similarly, the depth d2 of the concave shape is not particularly limited, and can be, for example, 1.2 mm or more (preferably 1.5 to 1.7 mm). Furthermore, the depth d2 of the concave shape can be less than or equal to the thickness of plates 6 and 26. When the depth d2 of the concave shape is the same as the thickness of plates 6 and 26, the fixing parts 7 and 27 are typically through holes. Moreover, the shape of the fixing parts 7 and 27 when viewed from above can be, for example, circular, elliptical, polygonal, or arc-shaped.

[0060] As dry friction materials 5 and 25, for example, plates 6 and 26 are annular in plan view, and dry friction substrates 1 and 21 can be arranged in multiple ways parallel to the inner or outer periphery of plates 6 and 26. It should be noted that "parallel" means that in dry friction material 5, the imaginary line connecting the centers of the multiple dry friction substrates 1 is substantially circular, forming concentric circles with the inner and outer peripheries of plate 6. Similarly, in dry friction material 25, the imaginary line connecting the centers of the multiple dry friction substrates 21 is substantially circular, forming concentric circles with the inner and outer peripheries of plate 26. Furthermore, since the dry friction substrate 21 is fan-shaped, its inner and outer peripheries typically form concentric circles with the inner and outer peripheries of plate 26.

[0061] In the above configurations, for example, multiple dry friction substrates 1 and 21 may be disposed on either the inner or outer periphery side of the surface of plates 6 and 26. Furthermore, multiple dry friction substrates 1 and 21 may be disposed at the midpoint between the inner and outer peripheries of the surface of plates 6 and 26. Furthermore, combinations of two or more of the above-described configurations are also possible.

[0062] In the above configuration, for example, the dry friction substrates 1 and 21 can all be disposed on one circumference of the surface of plates 6 and 26 (see...). Figure 5 as well as Figure 13 Additionally, the dry friction substrates 1 and 21 can be configured with multiple circumferences of different diameters on the surfaces of plates 6 and 26 (see [reference]). Figure 7 (a), (b) and Figure 15 (a), (b)). However, depending on the design conditions of plates 6 and 26 (e.g., the location of mounting holes), some dry friction substrates 1 and 21 can also be configured off-circumference (see...). Figure 7 (c) and Figure 15 (c)).

[0063] In the above configuration, for example, the dry friction substrates 1 and 21 can be arranged at equal intervals. However, depending on the design conditions of the plates 6 and 26 (e.g., the location of the mounting holes), some or all of the dry friction substrates 1 and 21 can also be arranged at unequal intervals in the circumferential direction of the plates 6 and 26 (see [reference]). Figure 7 (d) and Figure 15 (d)).

[0064] In the above configuration, for example, a dry friction substrate 1 may be fixed on a fixed shape portion 7 (see...). Figure 1 as well as Figure 4Specifically, one dry friction substrate 1 can be fixed on one fixing shape portion 7 by fitting the fixed shape portion 2, which is located at the center of the bottom surface of the button-shaped dry friction substrate 1, with the fixing shape portion 7, which is located on the surface of the plate 6. In this configuration, when the dry friction substrates 1 are arranged at equal intervals in the circumferential direction of the plate 6, the fixing shape portions 7 are also typically arranged at equal intervals.

[0065] In the above configuration, for example, a dry friction substrate 21 can be fixed to multiple fixed shape portions 27 by the fixed shape portion 22 (see...). Figure 10 as well as Figure 12 Specifically, by engaging the fixed shape portions 22 at both ends of the arcuate direction of the fan-shaped dry friction substrate 21 with the fixed shape portions 27 provided on the surface of the plate 26, one dry friction substrate 21 can be locked (clamped) among multiple fixed shape portions 27. In this configuration, when the dry friction substrates 21 are arranged at equal intervals in the circumferential direction of the plate 26, the pairs of fixed shape portions 27 corresponding to the two ends of one dry friction substrate 21 are also typically arranged at equal intervals.

[0066] In this dry friction material 5, 25, for example, the dry friction substrate 1, 21 can be bonded to the surface of the plate 6, 26 by an adhesive material or the like. From the viewpoint of processability, the dry friction substrate 1, 21 is preferably not bonded to the surface of the plate 6, 26, but is fixed by the engagement relationship between the fixed shape part 2, 22 and the fixed shape part 7, 27.

[0067] In this dry friction material 5, 25, for example, the bottom surface of the dry friction substrate 1, 21 can abut against the surface of the plate 6, 26, and the bottom surface of the dry friction shape 1, 21 can also be separated from the surface of the plate 6, 26.

[0068] In this dry friction material 5, 25, for example, dry friction substrates 1, 21 of the same shape and / or size can be fixed on the surface of plates 6, 26, or dry friction substrates 1, 21 of different shapes and / or sizes can be fixed.

[0069] [3][Torque Limiting Device] The torque limiting devices 11 and 31 in this embodiment are, for example, as follows: Figure 8 , Figure 9 , Figure 16 as well as Figure 17As shown, the torque limiting devices 11 and 31 with dry friction materials 5 and 25 are characterized in that the dry friction materials 5 and 25 have plates 6 and 26 that are annular in shape when viewed from above, and dry friction substrates 1 and 21 fixed on the surface of the plates 6 and 26. The plates 6 and 26 have fixing shape portions 7 and 27 on their surfaces for fixing, and the dry friction substrates 1 and 21 have fixing shape portions 2 and 22 that engage with the fixing shape portions 7 and 27.

[0070] It should be noted that the dry friction materials 5 and 25 used to constitute the torque limiting devices 11 and 31 may be, for example, the dry friction materials 5 and 25 described in [2] above.

[0071] As the torque limiting devices 11 and 31, plates 6 and 26 can be in the form of cover plates 6A and 26A or push plates 6B and 26B. In this case, the cover plates 6A and 26A and the push plates 6B and 26B are arranged such that the surfaces on which the dry friction substrates 1 and 21 are fixed are facing each other, and the friction plates 12 and 32 are disposed between the cover plates 6A and 26A and the push plates 6B and 26B in a state that allows them to contact the dry friction substrates 1 and 21.

[0072] As the torque limiting devices 11 and 31, plates 6 and 26 can be used as intermediate plates, for example. In this case, dry friction substrates 1 and 21 are fixed on the surface and back of the intermediate plate, and the intermediate plate is arranged between the cover plate 6A and 26A and the push plate 6B and 26B in a state where the dry friction substrates 1 and 21 are in contact with each plate 6A, 26A, 6B and 26B.

[0073] In these torque limiting devices 11 and 31, for example, the positions of the dry friction substrates 1 and 21 of the cover plates 6A and 26A around the axis C can be the same as the positions of the dry friction substrates 1 and 21 of the push plates 6B and 26B around the axis C. However, the positions of the dry friction substrates 1 and 21 of each plate 6A and 26A around the axis C can also be staggered.

[0074] [4] Fixing structure of dry friction substrate The fixing structure of the dry friction substrates 1 and 21 in this embodiment is, for example, as follows: Figure 1 , Figure 4 , Figure 10 as well as Figure 12As shown, a fixing structure for fixing dry friction substrates 1 and 21 on the surface of a plate 6 for a torque limiting device is characterized in that a fixing shape portion 7 or 27 with a convex or concave shape is provided on the surface of the plate 6 for fixing, and a fixing shape portion 2 or 22 with a shape that engages with the fixing shape portion 7 or 27 is provided on the dry friction substrate 1 or 21. The dry friction substrate 1 or 21 is fixed to the surface of the plate 6 or 26 by the engagement relationship between the fixing shape portion 7 or 27 and the fixing shape portion 2 or 22.

[0075] It should be noted that the dry friction substrates 1 and 21 that constitute the fixed structure of the dry friction substrates 1 and 21 can be, for example, the dry friction substrates 1 and 21 described in [1] above.

[0076] As a fixing structure for the dry friction base materials 1 and 21, for example, the dry friction base materials 1 and 21 may be fixed to the plates 6 and 26 by means of an interlocking relationship without being joined. However, the dry friction base materials 1 and 21 may also be fixed by means of an interlocking relationship between the fixing shape parts 7 and 27 and the fixed shape parts 2 and 22 while being joined to the plates 6 and 26 by means of an adhesive or the like.

[0077] As a fixing structure for the dry friction substrate 1, for example, the dry friction substrate 1 can be formed into a button shape, with a fixing shape portion 2 provided in the center, and one dry friction substrate 1 is fixed to one fixing shape portion 7 by the fixing shape portion 2 (see embodiment). Figure 1 as well as Figure 4 ).

[0078] As a fixing structure for the dry friction substrate 21, for example, the dry friction substrate 21 can be formed into a fan shape, with fixed shape portions 22 provided at both ends, and the dry friction substrate 21 is fixed to a plurality of fixed shape portions 27 by the fixed shape portions 22. Figure 10 as well as Figure 12 ).

[0079] [5] Other The dry friction substrates 1 and 21, dry friction materials 5 and 25, torque limiting devices 11 and 31, and the fixing structure of the dry friction substrates 1 and 21 in this embodiment are widely used in various fields such as automobiles, railway vehicles (various types of vehicles), aircraft bodies (various types of aircraft bodies), ships and hulls (various types of hulls), machine tools, industrial machinery, and product manufacturing.

[0080] The present invention will be described below through Examples 1 and 2.

[0081] <Example 1> like Figure 1As shown, in this embodiment, the dry friction substrate 1 is fixed to the surface of the plate 6 used for the torque limiting device 11 described later. The dry friction substrate 1 has a fixed shape portion 2 for fixing. Furthermore, the shape of the dry friction substrate 1 when viewed from above is circular. Additionally, the thickness t of the dry friction substrate 1 is 2.4 mm. Moreover, the dry friction substrate 1 is a rubber molded product containing heat-resistant reinforcing fibers such as glass fiber.

[0082] The dry friction substrate 1 is button-shaped, with a fixed shape portion 2 at the center of its bottom surface. The fixed shape portion 2 is concave. The depth d1 of the concave shape is 1.6 mm. Furthermore, the fixed shape portion 2 is circular when viewed from above.

[0083] like Figure 5 and Figure 6 As shown, the dry friction material 5 of this embodiment includes a plate 6 for the torque limiting device 11 described later, and the aforementioned dry friction substrate 1 fixed to the surface of the plate 6. The plate 6 has a fixing shape portion 7 on its surface for fixing. The fixing shape portion 7 is convex (see [link to documentation]). Figure 1 The height h2 of the convex shape is 1.2 mm. Furthermore, the shape of the fixed shape part 7 when viewed from above is circular.

[0084] The shape of plate 6 when viewed from above is annular. Multiple (six in the figure) fixing parts 7 and dry friction substrates 1 are provided parallel to the inner or outer periphery of plate 6. Furthermore, all fixing parts 7 and dry friction substrates 1 are arranged on the same circumference of the surface of plate 6. Moreover, the fixing parts 7 and dry friction substrates 1 are arranged at equal intervals.

[0085] In the dry friction material 5, a dry friction substrate 1 is fixed in a fixed shape portion 7. Specifically, the dry friction substrate 1 is fixed in a fixed shape portion 7 by fitting the fixed shape portion 2 of the dry friction substrate 1 into the fixed shape portion 7 of the plate 6.

[0086] like Figure 8 as well as Figure 9 As shown, the torque limiting device 11 of this embodiment includes the aforementioned dry friction substrate 1. Furthermore, the torque limiting device 11 includes a cover plate 6A and a push plate 6B as the aforementioned plate 6. These plates 6A and 6B are arranged such that the surfaces to which the dry friction substrate 1 is fixed are opposite each other. Furthermore, the friction plate 12 is disposed between the plates 6A and 6B in a state of contact with the dry friction substrate 1.

[0087] The push plate 6B has a locking portion 13 extending along the axis C. The cover plate 6A has a locked portion 14 (specifically, a hole 14) that engages with the locking portion 13. Through the engagement of these locking portions 13 and locked portions 14, the cover plate 6A and the push plate 6B are configured to be unable to rotate relative to each other around the axis C but can move relative to each other along the axis. Furthermore, the push plate 6B is subjected to force on the cover plate 6A by a force-applying mechanism (not shown).

[0088] Each plate 6A, 6B, and the rubbed plate 12 is made of a metal such as stainless steel. The surfaces of each plate 6A, 6B to which the dry friction substrate 1 is fixed are surface-treated by coating or the like to ensure that they have a higher coefficient of friction than the surface of the rubbed plate 12. This suppresses the aggression on the fixed shape portion 7 of the dry friction substrate 1.

[0089] As described above, the dry friction substrate 1 according to this embodiment has a fixed shape portion 2 for fixing. Therefore, by engaging the fixed shape portion 2 with the fixing shape portion 7 provided on the surface of the plate 6, the segmented dry friction substrate 1 can be easily fixed to the surface of the plate 6 while suppressing damage. Thus, compared to the conventional method of pressing a dry friction substrate thicker than the plate into a through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 11 can perform both appropriate torque transmission and torque suppression functions.

[0090] Furthermore, because the dry friction substrate 1 is segmented, compared to the conventional annular dry friction substrate, it can achieve increased yield (due to reduced material costs from the smaller friction area and increased production from increased heat treatment input), while also increasing design freedom (miniaturization, weight reduction, and rationalization of required values ​​(flatness deviation, cracking, etc.)). In particular, due to the smaller friction area and increased surface pressure, a more stable coefficient of friction can be ensured (specifically, reducing the rate of decrease in the coefficient of friction during thermally degraded sliding).

[0091] Furthermore, in the dry friction substrate 1 of this embodiment, the shape of the fixed portion 2 is concave. This allows the dry friction substrate 1 to be easily fixed to the plate 6 while further suppressing damage.

[0092] Furthermore, in this embodiment, the dry friction substrate 1 is button-shaped, with a fixed shape portion 2 at its center. This allows the dry friction substrate 1 to be easily fixed to the plate 6 while further suppressing damage. Moreover, by adjusting the fixing position and number of the dry friction substrates 1 according to the size of the plate 6, dry friction substrates 1 of the same shape can be used to accommodate plates 6 of different sizes. Furthermore, in conventional annular dry friction substrates, it is necessary to manufacture and manage molding dies to match the dimensions; however, with the button-shaped dry friction substrate 1, all substrates can be manufactured to the same size, thus enabling low-cost and efficient manufacturing.

[0093] The dry friction material 5 according to this embodiment includes a plate 6 for a torque limiting device 11 and a dry friction substrate 1 fixed to the surface of the plate 6. The plate 6 has a fixing shape portion 7 for fixing on its surface, and the dry friction substrate 1 has a fixing shape portion 2 that engages with the fixing shape portion 7. Thus, the segmented dry friction substrate 1 is fixed to the surface of the plate 6 while suppressing damage. Therefore, compared to the conventional method of pressing a dry friction substrate thicker than the plate into a through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 11 can perform both appropriate torque transmission and torque suppression functions.

[0094] Furthermore, in the dry friction material 5 of this embodiment, a dry friction substrate 1 is fixed on a fixed shape portion 7. Thus, the segmented dry friction substrate 1 is fixed to the surface of the plate 6 while further suppressing damage.

[0095] According to the torque limiting device 11 of this embodiment, the dry friction material 5 includes a plate 6 with an annular shape when viewed from above, and a dry friction substrate 1 fixed to the surface of the plate 6. The plate 6 has a fixing shape portion 7 on its surface for fixing, and the dry friction substrate 1 has a fixing shape portion 2 that engages with the fixing shape portion 7. Thus, the segmented dry friction substrate 1 is fixed to the surface of the plate 6 while suppressing damage. Therefore, compared to the conventional method of pressing a dry friction substrate thicker than the plate into a through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 11 can perform both appropriate torque transmission and torque suppression functions.

[0096] Furthermore, in the torque limiting device 11 of this embodiment, the cover plate 6A and the push plate 6B are arranged such that the surfaces to which the dry friction substrate 1 is fixed are facing each other, and the rubbed plate 12 is disposed between the cover plate 6A and the push plate 6B in a state of contact with the dry friction substrate 1. As a result, by rotating (slipping) each plate 6A, 6B relative to the rubbed plate 12, the transmitted torque transmitted between each plate 6A, 6B and the rubbed plate 12 is suppressed to below a predetermined specified value.

[0097] According to the fixing structure of the dry friction substrate 1 in this embodiment, a convex fixing shape portion 7 is provided on the surface of the plate 6 for fixing, and a fixing shape portion 2 that engages with the fixing shape portion 7 is provided on the dry friction substrate 1. The dry friction substrate 1 is fixed to the surface of the plate 6 by the engagement relationship between the fixing shape portion 7 and the fixing shape portion 2. As a result, the segmented dry friction substrate 1 can be easily fixed to the surface of the plate 6 while suppressing damage. Therefore, compared with the conventional case of pressing a dry friction substrate thicker than the plate into the through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 11 can perform appropriate torque transmission and torque suppression functions.

[0098] Furthermore, in the fixing structure of the dry friction substrate 1 in this embodiment, the dry friction substrate 1 is not joined to the plate 6, but is fixed only by a snap-fit ​​relationship. Therefore, the dry friction substrate 1 can be fixed to the plate 6 without the need for an adhesive coating process, thus achieving cost reduction.

[0099] Furthermore, in the fixing structure of the dry friction substrate 1 in this embodiment, the dry friction substrate 1 is formed in the shape of a button, and a fixing shape part 2 is provided in the center. One dry friction substrate 1 is fixed to one fixing shape part 7 by the fixing shape part 2. Thus, the dry friction substrate 1 can be easily fixed to the plate 6 while further suppressing damage.

[0100] <Example 2> like Figure 10 As shown, in this embodiment, the dry friction substrate 21 is fixed to the surface of the plate 26 used in the torque limiting device 31, which will be described later. The dry friction substrate 21 has a fixed shape portion 22 for fixing. In addition, the shape of the dry friction substrate 21 when viewed from above is arc-shaped. Furthermore, the dry friction substrate 21 is a rubber molded article containing heat-resistant reinforcing fibers such as glass fiber.

[0101] The dry friction substrate 21 is fan-shaped, with fixed-shape portions 22 at both ends in the arc direction. The inner diameter R1 of the dry friction substrate 21 is 95 mm, and its outer diameter R2 is 110 mm. Furthermore, the fan-shaped angle θ of the dry friction substrate 21 is 60 degrees. The thickness t of the dry friction substrate 21 is 2.4 mm. The fixed-shape portions 22 are slit-shaped. The slit-shaped fixed-shape portions 22 are portions where an arc-shaped cut is formed inward from the arc-shaped end face of the dry friction substrate 21.

[0102] like Figure 13 as well as Figure 14As shown, the dry friction material 25 of this embodiment includes a plate 26 for the torque limiting device 31 and the aforementioned dry friction substrate 21 fixed to the surface of the plate 26. The plate 26 has a fixing shape portion 27 on its surface for fixing. The fixing shape portion 27 is convex (see [reference]). Figure 10 The height h2 of the convex shape is 1.2 mm. In addition, the shape of the fixed shape part 27 when viewed from above is circular.

[0103] The plate 26 has a ring-shaped shape when viewed from above. Multiple (three in the figure) fixing parts 27 and dry friction substrates 21 are provided parallel to the inner or outer periphery of the plate 26. Furthermore, all fixing parts 27 and dry friction substrates 21 are arranged on the same circumference of the surface of the plate 26. Moreover, the dry friction substrates 21 are arranged at equal intervals. Furthermore, pairs of fixing parts 27 corresponding to the fixing parts 22 at both ends of the dry friction substrates 21 are also arranged at equal intervals.

[0104] In the dry friction material 25, a dry friction substrate 21 is secured to multiple (two in the figure) fixed shape portions 27 by a fixed shape portion 22. Specifically, by engaging the fixed shape portion 22 of the dry friction substrate 21 with the fixed shape portion 27 of the plate 26, a dry friction substrate 21 is secured (clamped) between the multiple fixed shape portions 27.

[0105] like Figure 16 as well as Figure 17 As shown, the torque limiting device 31 of this embodiment includes the aforementioned dry friction material 25. Furthermore, the torque limiting device 31 includes a cover plate 26A and a push plate 26B as the aforementioned plate 26. These plates 26A and 26B are arranged such that the surfaces to which the dry friction substrate 21 is fixed are opposite each other. Furthermore, the friction plate 32 is disposed between the plates 26A and 26B in a state of contact with the dry friction substrate 21.

[0106] The push plate 26B has a locking portion 33 extending along the axis C. The cover plate 26A has a locked portion 34 (specifically, a hole 34) that engages with the locking portion 33. Through the engagement of these locking portions 33 and locked portions 34, the cover plate 26A and the push plate 26B are configured to be unable to rotate relative to each other around the axis C but can move relative to each other along the axis. In addition, the push plate 26B applies force toward the cover plate 6A via a force-applying mechanism (not shown).

[0107] Each plate 26A, 26B, and the rubbed plate 32 is made of a metal such as stainless steel. The surfaces of each plate 26A, 26B to which the dry friction substrate 21 is fixed are surface treated by coating or the like to ensure that they have a higher coefficient of friction than the surface of the rubbed plate 32. This suppresses the aggression on the fixed shape portion 22 of the dry friction substrate 21.

[0108] As can be seen from the above, the dry friction substrate 21 according to this embodiment has a fixed shape portion 22 for fixing. Therefore, by engaging the fixed shape portion 22 with the fixing shape portion 27 provided on the surface of the plate 26, the segmented dry friction substrate 21 can be easily fixed to the surface of the plate 26 while suppressing damage. Therefore, compared to the conventional method of pressing a dry friction substrate thicker than the plate into a through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 31 can perform appropriate torque transmission and torque suppression functions.

[0109] Furthermore, because the dry friction substrate 21 is segmented, compared to conventional annular dry friction substrates, it is possible to increase the yield (due to reduced material costs from the smaller friction area and increased production from increased heat treatment input), while simultaneously improving design freedom (miniaturization, weight reduction, and rationalization of required values ​​(flatness deviation, cracking, etc.)). In particular, due to the smaller friction area and increased surface pressure, a more stable coefficient of friction can be ensured (reducing the rate of decrease in the coefficient of friction during thermally degraded sliding).

[0110] Furthermore, in the dry friction substrate 21 of this embodiment, the shape of the fixed shape portion 22 is slit-shaped. This allows the dry friction substrate 21 to be easily fixed to the plate 26 while further suppressing damage.

[0111] Furthermore, in this embodiment, the dry friction substrate 21 is fan-shaped, with fixed shape portions 22 at both ends. This allows the dry friction substrate 21 to be easily fixed to the plate 26 while further suppressing damage.

[0112] The dry friction material 25 according to this embodiment includes a plate 26 for a torque limiting device 31 and a dry friction substrate 21 fixed to the surface of the plate 26. The plate 26 has a fixing shape portion 27 for fixing on its surface, and the dry friction substrate 21 has a fixing shape portion 22 that engages with the fixing shape portion 27. Thus, the segmented dry friction substrate 21 is fixed to the surface of the plate 26 while suppressing damage. Therefore, compared to the conventional method of pressing a dry friction substrate thicker than the plate into a through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 31 can perform appropriate torque transmission and torque suppression functions.

[0113] Furthermore, in the dry friction material 25 of this embodiment, one dry friction substrate 21 is secured to multiple fixed shape portions 27 by the fixed shape portion 22. Thus, the dry friction substrate 21 is fixed to the plate 26 while further suppressing damage.

[0114] According to the torque limiting device 31 of this embodiment, the dry friction material 25 includes a plate 26 with an annular shape when viewed from above, and a dry friction substrate 21 fixed to the surface of the plate 26. The plate 26 has a fixing shape portion 27 for fixing on its surface, and the dry friction substrate 21 has a fixing shape portion 22 that engages with the fixing shape portion 27. Thus, the segmented dry friction substrate 21 is fixed to the surface of the plate 26 while suppressing damage. Therefore, compared to the conventional method of embedding a dry friction substrate thicker than the plate into a through hole of the plate, a stable coefficient of friction can be ensured. As a result, the torque limiting device 31 can perform both appropriate torque transmission and torque suppression functions.

[0115] Furthermore, in the torque limiting device 31 of this embodiment, the cover plate 26A and the push plate 26B are arranged such that the surfaces to which the dry friction substrate 21 is fixed are facing each other, and the friction plate 32 is disposed between the cover plate 26A and the push plate 26B in a state of contact with the dry friction substrate 21. As a result, through the relative rotation (slippage) of each plate 26A, 26B and the friction plate 32, the transmitted torque transmitted between each plate 26A, 26B and the friction plate 32 is suppressed to below a predetermined specified value.

[0116] According to the fixing structure of the dry friction substrate 21 in this embodiment, a fixing shape portion 27 with a convex shape is provided on the surface of the plate 26 for fixing, and a fixing shape portion 22 with a shape that engages with the fixing shape portion 27 is provided on the dry friction substrate 21. The dry friction substrate 21 is fixed to the surface of the plate 26 by the engagement relationship between the fixing shape portion 27 and the fixing shape portion 22. As a result, the segmented dry friction substrate 21 can be easily fixed to the surface of the plate 26 while suppressing damage. Therefore, compared with the conventional case of pressing a dry friction substrate thicker than the plate into the through hole of the plate and embedding it, a stable coefficient of friction can be ensured. As a result, the torque limiting device 31 can perform appropriate torque transmission and torque suppression functions.

[0117] Furthermore, in the fixing structure of the dry friction substrate 21 in this embodiment, the dry friction substrate 21 is not joined to the plate 26, but is fixed only by a snap-fit ​​relationship. Therefore, the dry friction substrate 21 can be fixed to the plate 26 without the need for an adhesive coating process, thus achieving cost reduction.

[0118] Furthermore, in the fixing structure of the dry friction substrate 21 in this embodiment, the dry friction substrate 21 is formed in a fan shape, and fixed shape portions 22 are provided at both ends. The dry friction substrate 21 is fixed to a plurality of fixed shape portions 27 by the fixed shape portions 22. Thus, the dry friction substrate 21 can be easily fixed to the plate 26 while further suppressing damage.

[0119] Symbol Explanation 1,21: Dry friction substrate, 2,22: Fixed shape part, 5.25: Dry friction materials 6, 26: Board, 6A, 26A: Cover plate, 6B, 26B: Push plate, 7.27: Fixed shape part, 11, 31: Torque limiting device, 12, 32: The friction plate.

Claims

1. A dry friction substrate, which is a dry friction substrate fixed to the surface of a plate for a torque limiting device, characterized in that, It has a fixed shape portion for performing the fixing.

2. The dry friction substrate as described in claim 1, wherein, The shape of the fixed part is concave, convex, or slit-shaped.

3. The dry friction substrate as described in claim 1 or 2, wherein, The shape of the dry friction substrate when viewed from above is circular, elliptical, polygonal, or arc-shaped.

4. The dry friction substrate as described in claim 1 or 2, wherein, The dry friction substrate is button-shaped, with the fixed shape portion located at the center.

5. The dry friction substrate as described in claim 1 or 2, wherein, The dry friction substrate is fan-shaped, with the fixed shape portion provided at both ends.

6. A dry friction material, characterized in that, have: A plate for a torque limiting device, and a dry friction substrate fixed to the surface of the plate. The plate has a fixing shape portion on the surface for fixing. The dry friction substrate has a fixed shape portion that engages with the fixed shape portion.

7. The dry friction material as described in claim 6, wherein, The shape of the fixed shape part is convex or concave.

8. The dry friction material as described in claim 6 or 7, wherein, The plate has a ring-shaped form when viewed from above. The dry friction substrate is provided in a plurality of manner parallel to the inner or outer periphery of the plate.

9. The dry friction material as described in claim 8, wherein, The dry friction substrates are arranged at equal intervals.

10. The dry friction material as described in claim 8, wherein, One dry friction substrate is fixed on one of the fixed shape portions.

11. The dry friction material as described in claim 8, wherein, One of the dry friction substrates is secured to a plurality of fixed shapes by the fixed shape portion.

12. A torque limiting device, which is a torque limiting device incorporating a dry friction material, characterized in that, The dry friction material comprises a plate that is ring-shaped when viewed from above, and a dry friction substrate fixed to the surface of the plate. The plate has a fixing shape portion on the surface for fixing. The dry friction substrate has a fixed shape portion that engages with the fixed shape portion.

13. The torque limiting device as claimed in claim 12, wherein, The dry friction substrate is provided in a plurality of manner parallel to the inner or outer periphery of the plate.

14. The torque limiting device as claimed in claim 13, wherein, The dry friction substrates are arranged at equal intervals.

15. The torque limiting device as claimed in claim 12, wherein, The plate is a cover plate or a push plate.

16. The torque limiting device as claimed in claim 15, wherein, The cover plate and the push plate are configured such that the surfaces to which the dry friction substrate is fixed are opposite each other. The friction plate is disposed between the cover plate and the push plate in a state of contact with the dry friction substrate.

17. A fixing structure for a dry friction substrate, characterized in that it fixes the dry friction substrate to the surface of a plate used for a torque limiting device. On the surface of the plate, a fixing shape portion formed in a convex or concave shape is provided for fixing. The dry friction substrate has a fixed shape portion that engages with the fixed shape portion. The dry friction substrate is fixed to the surface of the plate by the engagement relationship between the fixed shape part and the fixed shape part.

18. The fixing structure of the dry friction substrate as described in claim 17, wherein, For the plate, the dry friction substrate is not joined, but fixed only by the interlocking relationship.

19. The fixing structure of the dry friction substrate as described in claim 17 or 18, wherein, The dry friction substrate is formed in the shape of a button, with the fixed shape portion located at the center. One of the dry friction substrates is fixed to one of the fixed shape portions by means of the fixed shape portion.

20. The fixing structure of the dry friction substrate as described in claim 17 or 18, wherein, The dry friction substrate is formed in a fan shape, with the fixed shape portion provided at both ends. The dry friction substrate is secured to a plurality of fixed shapes by means of the fixed shape portion.

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