Dry friction base material, dry friction material, torque limiter device, and fixation structure for dry friction base material

Abstract

The purpose of the present invention is to provide a dry friction base material, a dry friction material, a torque limiter device, and a fixation structure for the dry friction base material that can ensure a stable friction coefficient. This dry friction base material 1 is fixed onto a surface of a plate 6 for a torque limiter device, and has a portion 2 shaped for fixation. The shape of said portion is preferably a recessed shape, a protruding shape, or a notch shape. Further, the shape of the dry friction base material in a plan view is preferably circular, elliptical, polygonal, or arcuate.

Description

Dry friction base material, dry friction material, torque limiter device, and fixing structure for dry friction base material

[0001] The present invention relates to a dry friction base material, a dry friction material, a torque limiter device, and a fixing structure for the dry friction base material.

[0002] Torque limiter devices mounted on vehicles such as hybrid vehicles have been generally known. Torque limiter devices have a stable torque transmission function and a torque suppression function (i.e., a unit defense function) when excessive torque occurs. Therefore, the dry friction material used in the torque limiter device is required to have a stable friction coefficient. A commonly known dry friction material includes a ring-shaped plate and a ring-shaped dry friction substrate fixed to the plate (see, for example, Patent Document 1). In response to this, in order to further satisfy the demand for cost reduction, it has been considered to arrange a plurality of segmented dry friction substrates in the circumferential direction of the plate.

[0003] Here, Patent Documents 2 to 6 disclose techniques for arranging a plurality of segmented dry friction base materials in the circumferential direction of a plate. Specifically, they disclose a technique for forming a plurality of arc-shaped through holes on the outer periphery of a ring-shaped plate, and press-fitting both ends in the arc direction of an arc-shaped dry friction base material that is thicker than the plate into each through hole. Furthermore, Patent Documents 2 to 5 disclose that there is no need to fix or adhere the dry friction base material to the plate with rivets, which simplifies the process and enables implementation at low cost.

[0004] JP 2020-148335 A JP 2011-027122 A JP 2010-286044 A JP 2010-286043 A JP 2011-047470 A DE102020126855A1

[0005] However, in the technologies disclosed in Patent Documents 2 to 6, in order to fix a segmented dry friction substrate to a plate, both ends of the dry friction substrate in the arc direction, which is thicker than the plate, are press-fitted into the through-hole of the plate. Therefore, the through-hole and the dry friction substrate must be machined into the same arc shape, which requires high precision and high cost. High machining precision is particularly required for the through-hole and both ends of the dry friction substrate in the arc direction. In other words, if the machining precision of the through-hole and both ends of the dry friction substrate in the arc direction is low, high pressure is applied to the end faces of the dry friction substrate in the arc direction when fixing the dry friction substrate to the plate, which may damage the end faces. As a result, it becomes difficult to ensure a stable friction coefficient, and the torque limiter device cannot perform its appropriate torque transmission and torque suppression functions.

[0006] The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a dry friction base material, a dry friction material, a torque limiter device, and a fixing structure for the dry friction base material, which are capable of ensuring a stable friction coefficient when the dry friction base material is segmented.

[0007] The present invention includes the following inventions. [1] A dry friction base material fixed on the surface of a plate for a torque limiter device, characterized in that it has a fixed shaped portion for said fixing. [2] The dry friction base material according to the above [1], wherein the shape of the fixed shaped portion is concave, convex, or notched. [3] The dry friction base material according to the above [1] or [2], wherein the shape in a plan view is circular, elliptical, polygonal, or arcuate. [4] The dry friction base material according to any of the above [1] to [3], which is button-shaped and has the fixed shaped portion provided in the center. [5] The dry friction base material according to the above [1] or [2], which is sector-shaped and has the fixed shaped portions provided at both ends. [6] A dry friction material comprising a plate for a torque limiter device and a dry friction base material fixed on the surface of the plate, characterized in that the plate has a fixing shaped portion on the surface for said fixing, and the dry friction base material has a fixed shaped portion that engages with the fixing shaped portion. [7] The dry friction material according to [6] above, wherein the shape of the fixing shaped portion is convex or concave. [8] The dry friction material according to [6] or [7] above, wherein the plate has a ring shape in a plan view, and a plurality of the dry friction substrates are provided parallel to the inner circumferential edge or the outer circumferential edge of the plate. [9] The dry friction material according to [8] above, wherein the dry friction substrates are arranged at equal intervals.

[10] The dry friction material according to any one of [6] to [8] above, wherein one dry friction substrate is fixed to one fixing shaped portion.

[11] The dry friction material according to any one of [6] to [8] above, wherein one dry friction substrate is engaged with a plurality of the fixing shaped portions via the fixed shaped portions.

[12] A torque limiter device equipped with a dry friction material, wherein the dry friction material comprises a plate having a ring-shaped shape in a plan view and a dry friction substrate fixed on a 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 that engages with the fixing shape portion.

[13] The torque limiter device according to

[12] above, wherein a plurality of the dry friction substrates are provided parallel to an inner circumferential edge or an outer circumferential edge of the plate.

[14] The torque limiter device according to

[13] above, wherein the dry friction substrates are arranged at equal intervals.

[15] The torque limiter device according to any of

[12] to

[14] above, wherein the plate is a cover plate or a push plate.

[16] The torque limiter device according to

[15] above, wherein the cover plate and the push plate are arranged with their surfaces, to which the dry friction substrates are fixed, facing each other, and a 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 fixing a dry friction substrate on a surface of a plate for a torque limiter device, wherein a fixing shaped portion, the shape of which is convex or concave for the fixing, is provided on the surface of the plate, and the dry friction substrate is provided with a fixed shaped portion shaped to engage with the fixing shaped portion, and the dry friction substrate is fixed on the surface of the plate by the engaging relationship between the fixing shaped portion and the fixed shaped portion.

[18] The fixing structure for a dry friction substrate according to

[17] above, wherein the dry friction substrate is fixed to the plate only by the engagement relationship without being joined.

[19] The fixing structure for a dry friction material according to

[17] or

[18] above, wherein the dry friction substrate is formed in a button shape and the fixed shaped portion is provided in the center, and one dry friction substrate is fixed to one fixing shaped portion via the fixed shaped portion.

[20] The fixing structure for a dry friction material according to any of

[17] to

[19] above, wherein the dry friction substrate is formed in a fan shape and the fixed shaped portion is provided at both ends, and the dry friction substrate is engaged with a plurality of the fixing shaped portions via the fixed shaped portions.

[0008] According to the present invention, a stable coefficient of friction can be ensured when segmenting a dry friction base material.

[0009] 1A and 1B are schematic diagrams illustrating a dry friction base material of Example 1, where (a) is a plan view, (b) is a cross-sectional view taken along line b-b, and (c) is a perspective view.

[0023] FIG. 1A is a schematic diagram illustrating a molding die for molding the dry friction base material, where (a) is a plan view and (b) is a cross-sectional view taken along line b-b.

[0024] FIG. 1B is a schematic diagram illustrating a dry friction base material of another embodiment, where (a) is an elliptical shape in a plan view, and (b) to (d) are polygonal shapes in a plan view.

[0025] FIG. 1B is a schematic diagram illustrating a dry friction base material of yet another embodiment, where (a) is an embodiment having a through-hole-shaped fixed shaped portion, and (b) and (c) are embodiments having a convex-shaped fixed shaped portion.

[0026] FIG. 1C is a schematic diagram illustrating a dry friction material of Example 1, where (a) is a plan view and (b) is a cross-sectional view taken along line b-b.

[0027] FIG. 1D is a schematic diagram illustrating a dry friction material of Example 1, where (a) is a plan view and (b) is a cross-sectional view taken along line b-b. 1 is a schematic diagram illustrating another embodiment of a dry friction material, where (a) and (b) show an embodiment in which the dry friction base material is arranged on multiple circumferences of a plate, (c) shows an embodiment in which a portion of the dry friction base material is arranged off the circumference, and (d) shows an embodiment in which a portion of the dry friction base material is arranged at uneven intervals in the circumferential direction. A schematic diagram illustrating a torque limiter device of Example 1 (a perspective view in an exploded state). A schematic diagram illustrating a torque limiter device (a longitudinal sectional view in an assembled state). A schematic diagram illustrating a dry friction base material of Example 2, where (a) shows a plan view, (b) shows a cross-sectional view along line b-b, and (c) shows a perspective view. A schematic diagram illustrating a molding die for molding the dry friction base material, where (a) shows a plan view, and (b) shows a cross-sectional view along line b-b. 1A and 1B are schematic diagrams illustrating dry friction substrates of other embodiments, where (a) shows an embodiment having a concave fixed portion, (b) shows an embodiment having a through-hole fixed portion, (c) and (d) show embodiments having convex fixed portions, and (e) shows an embodiment having fixed portions at both ends and a middle portion in the arc direction.

[0023] Fig. 1B is a schematic diagram illustrating a dry friction material of Example 2, where (a) shows a plan view and (b) shows a cross-sectional view taken along line b-b.

[0024] Fig. 1B is a schematic diagram illustrating a dry friction material of Example 2, where (a) shows a plan view and (b) shows a cross-sectional view taken along line b-b.1 is a schematic diagram illustrating another embodiment of a dry friction material, in which (a) and (b) show a form in which dry friction substrates are arranged on multiple circumferences of a plate, (c) shows a form in which some of the dry friction substrates are arranged off the circumference, and (d) shows a form in which all of the dry friction substrates are arranged at unequal intervals in the circumferential direction.

[0023] FIG. 1 is a schematic diagram illustrating a torque limiter device of Example 2 (a perspective view in an exploded state).

[0024] FIG. 2 is a schematic diagram illustrating a torque limiter device of Example 2 (a longitudinal sectional view in an assembled state).

[0010] The present invention will be described below with reference to the drawings. The matters shown here are for illustrative purposes and are intended to exemplify embodiments of the present invention, and are set forth in order to provide what is believed to be the most effective and easily understandable explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to show structural details of the present invention beyond the extent necessary for a fundamental understanding of the present invention, and the description, taken together with the drawings, will make clear to those skilled in the art how some aspects of the present invention can be actually embodied.

[0011] [1] Dry Friction Base Material The dry friction base material 1, 21 of the present embodiment is, for example, as shown in FIG. 1 and FIG. 10 , a dry friction base material 1, 21 fixed onto the surface of a plate 6, 26 for a torque limiter device, and is characterized by having a fixed shape portion 2, 22 for fixing.

[0012] The shape, material, etc. of the dry friction substrate 1, 21 are not particularly limited. The planar shape of the dry friction substrate 1, 21 can be, for example, a circle, an ellipse, a polygon, an arc, etc. (see FIGS. 1, 3, and 10). The thickness t of the dry friction substrate 1, 21 is not particularly limited, but can be, for example, 2.0 to 2.6 mm (preferably 2.3 to 2.5 mm). The dry friction substrate 1, 21 can be made of rubber containing heat-resistant reinforcing fibers such as glass fibers. The dry friction substrate 1, 21 may be a roving product (a dry friction substrate made using glass roving), but is preferably a molded product from the viewpoints of shape freedom and strength.

[0013] The dry friction base material 1 may be, for example, button-shaped and have a fixed shape portion 2 in the center (see FIGS. 1 and 4 ). The dry friction base material 1 can be obtained by molding using a molding die 16. Specifically, the molding die 16 includes a preliminary cavity 17 for accommodating a kneaded material M, a molding cavity 18 for molding a precursor (a shaped material before vulcanization) that becomes the dry friction base material 1, and a runner 19 that connects the preliminary cavity 17 and the molding cavity 18 (see FIG. 2 ). The kneaded material M (a kneaded material containing unvulcanized rubber, heat-resistant reinforcing fibers, friction modifiers, etc.) is accommodated in the preliminary cavity 17, and the kneaded material M is moved from the preliminary cavity 17 to the molding cavity 18 via the runner 19 by pressing to form a precursor, and the precursor is vulcanized to obtain the dry friction base material 1. Note that the button shape refers to a small piece-like shape having a predetermined thickness. More specifically, the maximum length in plan view is greater than the thickness t in side view (see FIG. 1(b)). For example, if the thickness t is 2.4 mm, the maximum diameter can be 8 mm or more and 30 mm or less. The shape in plan view is not limited, but may be, for example, a circle, an ellipse, a polygon, an arc, or the like (see FIGS. 1 and 3).

[0014] The number and arrangement of the cavities 17, 18 and runners 19 of the mold 16 are not particularly limited. For example, one liner 19 may be connected to one molding cavity 18, or multiple liners 19 may be connected. Adjacent molding cavities 18 may also be connected to each other. Furthermore, molding cavities 18 may be located on both sides of the preliminary cavity 17, rather than just on one side.

[0015] The dry friction base material 21 may have, for example, a fan-shaped shape in a plan view, with fixed shaped portions 22 provided at both ends (see FIGS. 10 and 12 ). The dry friction base material 21 can be obtained, for example, by molding using a molding die 36. Specifically, a kneaded material (a kneaded material containing unvulcanized rubber, heat-resistant reinforcing fibers, a friction modifier, etc.) extruded by an extruder or the like is placed in a molding cavity 38 (see FIG. 11 ) of the molding die 36, and a precursor (a shaped material before vulcanization) that becomes the dry friction base material 21 is molded by pressing. The precursor is then vulcanized to obtain the dry friction base material 21. However, a ring-shaped dry friction base material may also be formed using a roving material obtained by impregnating glass roving (glass fiber bundles) with a resin and coating it with rubber, and the ring-shaped dry friction base material is then cut to obtain the dry friction base material 21. The cutting of the ring-shaped dry friction base material 21 may be performed after molding using the molding die and before or after heat treatment.

[0016] The shape, size, etc. of the sector-shaped dry friction substrate 21 are not particularly limited, but the sector angle θ can be, for example, 15 to 180 degrees (preferably 30 to 90 degrees) (see FIG. 10(a)).

[0017] The shape of the fixed shaped portion 2, 22 is not particularly limited, but for example, a concave shape (see FIGS. 1 and 12(a)), a convex shape (see FIGS. 4(b), 4(c), 12(c), and 12(d)), a notched shape (see FIGS. 10, 4(c), and 12(e)), and a through-hole shape (see FIGS. 4(a) and 12(b)) can be used (see FIGS. 1, 4, 10, and 12). The depth d1 of the concave shape is not particularly limited, but for example, 1.2 mm or more (preferably 1.5 to 1.7 mm) can be used. Furthermore, the depth d1 of the concave shape can be equal to or less than the thickness t of the dry friction base material 1, 21. When the depth d1 of the concave shape is the same as the thickness t of the dry friction base material 1, 21, the fixed shaped portion 2, 22 usually has a through-hole shape. Furthermore, the height h1 of the convex shape is not particularly limited, but for example, 1.0 to 2.0 mm (preferably 1.1 to 1.3 mm) can be used. Furthermore, the shape of the fixed shape portions 2, 22 in plan view may be, for example, a circle, an ellipse, a polygon, an arc, or the like.

[0018] The button-shaped dry friction base material 1 may have a fixed shape portion 2 in the center of the bottom surface, which may be concave, through-hole-shaped, or convex (see Figs. 1 and 4). Of these, a concave or convex shape is preferred from the viewpoint of fixation, etc.

[0019] The sector-shaped dry friction substrate 21 may have, for example, notched fixed shaped portions 22 on both end surfaces in the arc direction (see FIG. 10). Furthermore, the bottom surfaces of both end portions in the arc direction may have concave (see FIG. 12(a)), through-hole (see FIG. 12(b)), or convex fixed shaped portions 22 (see FIGS. 12(c) and 12(d)) (see FIG. 12). Of these, the notched, concave, or convex shapes are preferred from the viewpoint of fixability, etc.

[0020] The fan-shaped dry friction base material 21 may have the fixed shape portion 22 only at both ends in the arc direction, or may have one or more fixed shape portions 22 provided in the middle part of the bottom surface in the arc direction in addition to the both ends (see FIG. 12( e)).

[0021] [2] Dry Friction Material As shown in, for example, FIGS. 5 , 6 , 13 and 14 , the dry friction materials 5 and 25 of the present embodiment include plates 6 and 26 for a torque limiter device and dry friction substrates 1 and 21 fixed on the surfaces of the plates 6 and 26, and are characterized in that the plates 6 and 26 have fixing shapes 7 and 27 for fixing on the surfaces thereof, and the dry friction substrates 1 and 21 have fixing shapes 2 and 22 that engage with the fixing shapes 7 and 27.

[0022] As the dry friction base materials 1, 21 constituting the dry friction materials 5, 25, for example, the dry friction base materials 1, 21 described in [1] above can be used.

[0023] The shape of the fixed shape portion 7, 27 is not particularly limited, but may be, for example, a convex shape, a concave shape, a through-hole shape, or the like (see Figures 1, 4, 10, and 12). The height h2 of the convex shape is not particularly limited, but may be, for example, 1.0 to 2.0 mm (preferably 1.1 to 1.3 mm). The depth d2 of the concave shape is not particularly limited, but may be, for example, 1.2 mm or more (preferably 1.5 to 1.7 mm). The depth d2 of the concave shape may be equal to or less than the thickness of the plate 6, 26. When the depth d2 of the concave shape is equal to the thickness of the plate 6, 26, the fixed shape portion 7, 27 typically has a through-hole shape. Furthermore, the planar shape of the fixed shape portion 7, 27 may be, for example, a circle, an ellipse, a polygon, an arc, or the like.

[0024] The dry friction materials 5, 25 may have, for example, a configuration in which the plates 6, 26 have a ring-like shape in a plan view, and the dry friction substrates 1, 21 are provided in plurality parallel to the inner periphery or outer periphery of the plates 6, 26. Note that "parallel" means that, in the dry friction material 5, an imaginary line connecting the centers of the multiple arranged dry friction substrates 1 is substantially circular and is substantially concentric with the inner periphery and outer periphery of the plate 6. Also, in the dry friction material 25, an imaginary line connecting the centers of the multiple arranged dry friction substrates 21 is substantially circular and is substantially concentric with the inner periphery and outer periphery of the plate 26. Furthermore, since the dry friction substrate 21 is fan-shaped, the inner periphery and outer periphery of the dry friction substrate 21 itself usually become substantially concentric with the inner periphery and outer periphery of the plate 26.

[0025] In the above embodiment, for example, a plurality of dry friction substrates 1, 21 may be arranged on the side closer to the inner periphery or the side closer to the outer periphery on the surface of the plates 6, 26. Furthermore, a plurality of dry friction substrates 1, 21 may be arranged in the middle between the inner periphery and the outer periphery on the surface of the plates 6, 26. Furthermore, a combination of two or more of the above arrangements may be used.

[0026] In the above embodiment, for example, the dry friction substrates 1, 21 may all be arranged on one circumference on the surface of the plates 6, 26 (see FIGS. 5 and 13). Also, a plurality of dry friction substrates 1, 21 may be arranged on each of a plurality of circumferences having different diameters on the surface of the plates 6, 26 (see FIGS. 7(a) and 7(b) and 15(a) and 15(b)). However, depending on the design conditions of the plates 6, 26 (for example, the positions of the mounting holes), some of the dry friction substrates 1, 21 may be arranged off the circumference (see FIGS. 7(c) and 15(c)).

[0027] In the above embodiment, for example, the dry friction substrates 1, 21 may be arranged at equal intervals. However, depending on the design conditions of the plates 6, 26 (for example, the positions of the mounting holes), some or all of the dry friction substrates 1, 21 may be arranged at unequal intervals in the circumferential direction of the plates 6, 26 (see FIG. 7(d) and FIG. 15(d)).

[0028] In the above embodiment, for example, one dry friction substrate 1 can be fixed to one fixing shape portion 7 (see FIGS. 1 and 4). Specifically, the fixed shape portion 2 provided at the center of the bottom surface of the button-shaped dry friction substrate 1 is fitted into the fixing shape portion 7 provided on the surface of the plate 6, thereby fixing one dry friction substrate 1 to one fixing shape portion 7. In this embodiment, 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 usually arranged at equal intervals.

[0029] In the above embodiment, for example, one dry friction substrate 21 can be fixed to a plurality of fixing portions 27 via fixed portions 22 (see FIGS. 10 and 12 ). Specifically, the fixed portions 22 provided at both ends of the fan-shaped dry friction substrate 21 in the arc direction engage with the fixing portions 27 provided on the surface of the plate 26, thereby allowing one dry friction substrate 21 to be fixed (sandwiched) between the plurality of fixing portions 27. In this embodiment, when the dry friction substrates 21 are arranged at equal intervals in the circumferential direction of the plate 26, the pairs of fixing portions 27 corresponding to both ends of one dry friction substrate 21 are also usually arranged at equal intervals.

[0030] In the dry friction materials 5 and 25, for example, the dry friction base materials 1 and 21 may be bonded to the surfaces of the plates 6 and 26 with an adhesive or the like. However, from the viewpoint of processability and the like, it is preferable that the dry friction base materials 1 and 21 are not bonded to the surfaces of the plates 6 and 26, but are fixed by the engagement relationship between the fixed shape portions 2 and 22 and the fixing shape portions 7 and 27.

[0031] In the present dry friction materials 5, 25, for example, the bottom surfaces of the dry friction substrates 1, 21 may be in contact with the surfaces of the plates 6, 26, or the bottom surfaces of the dry friction shapes 1, 21 may be spaced apart from the surfaces of the plates 6, 26.

[0032] In the dry friction materials 5, 25, for example, the dry friction substrates 1, 21 of the same shape and / or size may be fixed on the surfaces of the plates 6, 26, or the dry friction substrates 1, 21 of different shapes and / or sizes may be fixed on the surfaces of the plates 6, 26.

[0033] [3] Torque Limiter Device The torque limiter devices 11, 31 of the present embodiment are torque limiter devices 11, 31 equipped with dry friction materials 5, 25, as shown in, for example, FIGS. 8 , 9 , 16 and 17 , and the dry friction materials 5, 25 are equipped with plates 6, 26 that are ring-shaped in a plan view and dry friction substrates 1, 21 fixed on the surfaces of the plates 6, 26, and the plates 6, 26 have fixing shaped portions 7, 27 on their surfaces for fixing, and the dry friction substrates 1, 21 have fixed shaped portions 2, 22 that engage with the fixing shaped portions 7, 27.

[0034] As the dry friction materials 5, 25 constituting the torque limiter devices 11, 31, for example, the dry friction materials 5, 25 described in [2] above can be used.

[0035] The torque limiter devices 11, 31 may employ, for example, a configuration in which the plates 6, 26 are cover plates 6A, 26A or push plates 6B, 26B. In this case, the cover plates 6A, 26A and the push plates 6B, 26B are arranged with their surfaces, to which the dry friction substrates 1, 21 are fixed, facing each other, and friction plates 12, 32 may be disposed between the cover plates 6A, 26A and the push plates 6B, 26B in a state in contact with the dry friction substrates 1, 21.

[0036] In the torque limiter devices 11 and 31, for example, the plates 6 and 26 may be intermediate plates. In this case, the dry friction substrates 1 and 21 may be fixed to the front and back surfaces of the intermediate plates, and the intermediate plates may be disposed between the cover plates 6A and 26A and the push plates 6B and 26B in a state where the dry friction substrates 1 and 21 are in contact with the respective plates 6A, 26A, 6B, and 26B.

[0037] In the torque limiter devices 11 and 31, for example, the position of the cover plates 6A and 26A about the axis C of the dry friction substrates 1 and 21 can be the same as the position of the push plates 6B and 26B about the axis C of the dry friction substrates 1 and 21. However, the positions of the dry friction substrates 1 and 21 of the plates 6A and 26A about the axis C may be misaligned.

[0038] [4] Fixing Structure of Dry Friction Base Material The fixing structure of the dry friction base material 1, 21 of this embodiment is a fixing structure for fixing the dry friction base material 1, 21 on the surface of a plate 6 for a torque limiter device, as shown in, for example, FIGS. 1 , 4 , 10 and 12 , and is characterized in that fixing shaped portions 7, 27 having a convex or concave shape for fixing are provided on the surface of the plate 6, and fixed shaped portions 2, 22 having a shape that engages with the fixing shaped portions 7, 27 are provided on the dry friction base material 1, 21, and the dry friction base material 1, 21 is fixed on the surface of the plate 6, 26 by the engaging relationship between the fixing shaped portions 7, 27 and the fixed shaped portions 2, 22.

[0039] As the dry friction substrates 1, 21 constituting the fixing structure of the dry friction substrates 1, 21, for example, the dry friction substrates 1, 21 described above in [1] can be used.

[0040] As a fixing structure of the dry friction base materials 1, 21, for example, a form can be adopted in which the dry friction base materials 1, 21 are fixed to the plates 6, 26 only by an engaging relationship without being joined. However, the dry friction base materials 1, 21 may also be fixed to the plates 6, 26 by an engaging relationship between the fixing shape portions 7, 27 and the fixed shape portions 2, 22 in addition to being joined to the plates 6, 26 by an adhesive or the like.

[0041] As a fixing structure of the dry friction base material 1, for example, the dry friction base material 1 may be formed in a button shape, and a fixed shape portion 2 may be provided in the center thereof, and one dry friction base material 1 may be fixed to one fixed shape portion 7 via the fixed shape portion 2 (see FIGS. 1 and 4).

[0042] As a fixing structure of the dry friction substrate 21, for example, the dry friction substrate 21 may be formed in a fan shape, and fixed shaped portions 22 may be provided at both ends thereof, and the dry friction substrate 21 may be engaged with a plurality of fixed shaped portions 27 via the fixed shaped portions 22 (FIGS. 10 and 12).

[0043] [5] Others The dry friction base materials 1, 21, the dry friction materials 5, 25, the torque limiter devices 11, 31, and the fixing structure of the dry friction base materials 1, 21 according to the present embodiment are widely used in various fields, such as automobiles, railway vehicles (vehicles in general), aircraft airframes (airframes in general), ships and hulls (hulls in general), machine tools, industrial machinery, and product manufacturing.

[0044] The present invention will be explained below by means of Examples 1 and 2.

[0045] Example 1 As shown in FIG. 1 , the dry friction substrate 1 of this example is fixed onto the surface of a plate 6 for a torque limiter device 11, which will be described later. The dry friction substrate 1 has a fixed shape portion 2 for fixing. The shape of the dry friction substrate 1 in a plan view is circular. The thickness t of the dry friction substrate 1 is 2.4 mm. The dry friction substrate 1 is a rubber molded product that includes heat-resistant reinforcing fibers such as glass fibers.

[0046] The dry friction base material 1 is button-shaped, and has a fixed shape portion 2 provided in the center of the bottom surface. The fixed shape portion 2 has a concave shape. The depth d1 of the concave shape is 1.6 mm. Furthermore, the shape of the fixed shape portion 2 in a plan view is circular.

[0047] As shown in Figures 5 and 6, the dry friction material 5 of this embodiment includes a plate 6 for a torque limiter device 11 (described later) and the dry friction substrate 1 fixed on the surface of the plate 6. The plate 6 has a fixing shape portion 7 for fixing on its surface. The fixing shape portion 7 has a convex shape (see Figure 1). The height h2 of the convex shape is 1.2 mm. The shape of the fixing shape portion 7 in a plan view is circular.

[0048] The plate 6 has a ring-shaped shape in a plan view. A plurality of fixed shape portions 7 and dry friction substrates 1 (six in the figure) are provided parallel to the inner or outer peripheral edge of the plate 6. All of the fixed shape portions 7 and dry friction substrates 1 are arranged on the same circumference on the surface of the plate 6. Furthermore, the fixed shape portions 7 and dry friction substrates 1 are arranged at equal intervals.

[0049] In the dry friction material 5, one dry friction substrate 1 is fixed to one fixing shape portion 7. Specifically, the fixed shape portion 2 of the dry friction substrate 1 is fitted into the fixing shape portion 7 of the plate 6, thereby fixing one dry friction substrate 1 to one fixing shape portion 7.

[0050] 8 and 9, the torque limiter device 11 of this embodiment includes the dry friction substrate 1. The torque limiter device 11 also includes a cover plate 6A and a push plate 6B as the plates 6. These plates 6A and 6B are arranged so that the surfaces to which the dry friction substrate 1 is fixed face each other. Furthermore, a friction plate 12 is disposed between the plates 6A and 6B in a state of contact with the dry friction substrate 1.

[0051] The push plate 6B is provided with an engaging portion 13 extending in the direction of the axis C. The cover plate 6A is provided with an engaged portion 14 (specifically, a hole 14) that engages with the engaging portion 13. The engagement between the engaging portion 13 and the engaged portion 14 makes the cover plate 6A and the push plate 6B unable to rotate relative to each other around the axis C but movable relative to each other in the axial direction. Furthermore, the push plate 6B is biased toward the cover plate 6A by a biasing means (not shown).

[0052] Each of the plates 6A, 6B and the friction plate 12 is made of a metal such as stainless steel. The surface of each of the plates 6A, 6B to which the dry friction substrate 1 is fixed is surface-treated by coating or the like, ensuring a higher friction coefficient than the surface of the friction plate 12. This suppresses the aggressiveness of the dry friction substrate 1 to the fixed shape portion 7.

[0053] As described above, the dry friction substrate 1 of this embodiment has a fixed shape portion 2 for fixing. As a result, 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. Therefore, a stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate thicker than the plate is press-fitted into a through-hole of the plate. As a result, the torque limiter device 11 can exhibit appropriate torque transmission and torque suppression functions.

[0054] Furthermore, since the dry friction base material 1 is segmented, it is possible to improve yield (reducing material costs by reducing the friction area, increasing production volume by increasing the heat treatment input, etc.) and also improve design freedom (reducing size, reducing weight, optimizing required values ​​(deflatness, burst, etc.)) compared to conventional ring-shaped dry friction base materials. In particular, since the friction area is small and the surface pressure is high, it is possible to ensure a more stable friction coefficient (specifically, reducing the rate of decrease in the friction coefficient during thermally deteriorated sliding).

[0055] Furthermore, in the dry friction base material 1 of this embodiment, the shape of the fixed shape portion 2 is concave, which allows the dry friction base material 1 to be easily fixed to the plate 6 while further suppressing damage.

[0056] Moreover, the dry friction base material 1 of this embodiment is button-shaped and has a fixed shape portion 2 provided in the center. This allows the dry friction base material 1 to be easily fixed to the plate 6 while further suppressing damage. Furthermore, by adjusting the fixing location and number of the dry friction base material 1 according to the size of the plate 6, it is possible to use a dry friction base material 1 of the same shape to accommodate plates 6 of different sizes. Furthermore, with a conventional ring-shaped dry friction base material, it was necessary to create and manage a molding die according to the size, but with the button-shaped dry friction base material 1, all can be manufactured to the same size, allowing for efficient manufacturing at low cost.

[0057] The dry friction material 5 of this embodiment includes a plate 6 for a torque limiter device 11 and a dry friction substrate 1 fixed on the surface of the plate 6, with the plate 6 having a fixing shape portion 7 for fixing on its surface, and the dry friction substrate 1 having a fixed shape portion 2 that engages with the fixing shape portion 7. This allows the segmented dry friction substrate 1 to be fixed on the surface of the plate 6 while suppressing damage. Therefore, a stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate that is thicker than the plate is press-fitted into a through-hole in the plate. As a result, the torque limiter device 11 can exhibit appropriate torque transmission and torque suppression functions.

[0058] Furthermore, in the dry friction material 5 of this embodiment, one dry friction substrate 1 is fixed to one fixing shape portion 7. This allows the segmented dry friction substrate 1 to be fixed on the surface of the plate 6 while further suppressing damage.

[0059] According to the torque limiter device 11 of this embodiment, the dry friction material 5 includes a plate 6 that is ring-shaped in a plan view and a dry friction substrate 1 that is fixed to the surface of the plate 6, with the plate 6 having a fixing portion 7 on its surface for fixing, and the dry friction substrate 1 having a fixed portion 2 that engages with the fixing portion 7. This allows the segmented dry friction substrate 1 to be fixed to the surface of the plate 6 while suppressing damage. Therefore, a more stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate that is thicker than the plate is press-fitted into a through-hole in the plate. As a result, the torque limiter device 11 can exhibit appropriate torque transmission and torque suppression functions.

[0060] Furthermore, in the torque limiter device 11 of this embodiment, the cover plate 6A and the push plate 6B are arranged so that the surfaces to which the dry friction substrate 1 is fixed face each other, and the friction 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, the plates 6A, 6B and the friction plate 12 rotate relative to each other (slip), and the transmission torque transmitted between the plates 6A, 6B and the friction plate 12 is suppressed to be equal to or less than a predetermined value.

[0061] According to the fixing structure of the dry friction substrate 1 of this embodiment, a fixing shape portion 7 having a convex shape for fixing is provided on the surface of the plate 6, and a fixed shape portion 2 shaped to engage with the fixing shape portion 7 is provided on the dry friction substrate 1, and the dry friction substrate 1 is fixed on the surface of the plate 6 by the engagement relationship between the fixing shape portion 7 and the fixed shape portion 2. This makes it possible to easily fix the segmented dry friction substrate 1 on the surface of the plate 6 while suppressing damage. Therefore, a stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate thicker than the plate is press-fitted into a through-hole in the plate. As a result, the torque limiter device 11 can exhibit appropriate torque transmission and torque suppression functions.

[0062] Furthermore, in the fixing structure of the dry friction substrate 1 of this embodiment, the dry friction substrate 1 is fixed to the plate 6 only by an engaging relationship without being joined. This allows the dry friction substrate 1 to be fixed to the plate 6 without the need for an adhesive application process, thereby reducing costs.

[0063] Furthermore, in the fixing structure of the dry friction substrate 1 of this embodiment, the dry friction substrate 1 is formed in a button shape and has a fixed shape portion 2 provided in the center, and one dry friction substrate 1 is fixed to one fixing shape portion 7 via the fixed shape portion 2. This makes it possible to easily fix the dry friction substrate 1 to the plate 6 while further suppressing damage.

[0064] Example 2 As shown in Fig. 10, the dry friction substrate 21 of this example is fixed onto the surface of a plate 26 for a torque limiter device 31, which will be described later. The dry friction substrate 21 has a fixed shaped portion 22 for fixing. The shape of the dry friction substrate 21 in a plan view is arc-shaped. Furthermore, the dry friction substrate 21 is a rubber molded product that includes heat-resistant reinforcing fibers such as glass fibers.

[0065] The dry friction base material 21 is fan-shaped, and has fixed shaped portions 22 provided at both ends in the arc direction. The dry friction base material 21 has an inner diameter R1 of 95 mm and an outer diameter R2 of 110 mm. The fan angle θ of the dry friction base material 21 is 60 degrees. The thickness t of the dry friction base material 21 is 2.4 mm. The fixed shaped portion 22 has a notched shape. The notched fixed shaped portion 22 is a portion that is cut out in an arc shape from the end face of the dry friction base material 21 in the arc direction.

[0066] As shown in Figures 13 and 14, the dry friction material 25 of this embodiment includes a plate 26 for a torque limiter device 31 and the above-mentioned dry friction substrate 21 fixed on the surface of the plate 26. The plate 26 has a fixing shape portion 27 for fixing on the surface. The fixing shape portion 27 has a convex shape (see Figure 10). The height h2 of the convex shape is 1.2 mm. The shape of the fixing shape portion 27 in a plan view is circular.

[0067] The plate 26 has a ring-shaped shape in a plan view. A plurality of (three in the figure) fixed shape portions 27 and dry friction substrates 21 are provided parallel to the inner or outer peripheral edge of the plate 26. All of the fixed shape portions 27 and dry friction substrates 21 are arranged on the same circumference on the surface of the plate 26. The dry friction substrates 21 are arranged at equal intervals. The pairs of fixed shape portions 27 corresponding to the fixed shape portions 22 at both ends of the dry friction substrate 21 are arranged at equal intervals.

[0068] In the dry friction material 25, one dry friction substrate 21 is fixed to a plurality of (two in the figure) fixing portions 27 via fixed portions 22. Specifically, the fixing portions 22 of the dry friction substrate 21 are engaged with the fixing portions 27 of the plate 26, so that the one dry friction substrate 21 is fixed (sandwiched) between the plurality of fixing portions 27.

[0069] 16 and 17 , the torque limiter device 31 of this embodiment includes the dry friction material 25. The torque limiter device 31 also includes a cover plate 26A and a push plate 26B as the plates 26. These plates 26A and 26B are arranged with their surfaces, to which the dry friction substrate 21 is fixed, facing each other. Furthermore, a friction plate 32 is disposed between the plates 26A and 26B in a state of contact with the dry friction substrate 21.

[0070] The push plate 26B is provided with an engaging portion 33 extending in the direction of the axis C. The cover plate 26A is provided with an engaged portion 34 (specifically, a hole 34) that engages with the engaging portion 33. The engagement between the engaging portion 33 and the engaged portion 34 prevents the cover plate 26A and the push plate 26B from rotating relative to each other around the axis C but allows them to move relative to each other in the axial direction. The push plate 26B is also biased toward the cover plate 26A by a biasing means (not shown).

[0071] Each of the plates 26A, 26B and the friction plate 32 is made of a metal such as stainless steel. The surface of each of the plates 26A, 26B to which the dry friction substrate 21 is fixed is surface-treated by coating or the like, ensuring a higher friction coefficient than the surface of the friction plate 32. This suppresses the aggressiveness of the dry friction substrate 21 to the fixed shape portion 22.

[0072] As described above, the dry friction substrate 21 of this embodiment has the fixed shape portion 22 for fixing. As a result, 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, a stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate thicker than the plate is press-fitted into a through-hole of the plate. As a result, the torque limiter device 31 can exhibit appropriate torque transmission and torque suppression functions.

[0073] Furthermore, since the dry friction base material 21 is segmented, it is possible to improve yield (reducing material costs by reducing the friction area, increasing production volume by increasing the heat treatment input, etc.) and also improve design freedom (reducing size, reducing weight, optimizing required values ​​(deflatness, burst, etc.)) compared to conventional ring-shaped dry friction base materials. In particular, since the friction area is small and the surface pressure is high, it is possible to ensure a more stable friction coefficient (specifically, reducing the rate of decrease in the friction coefficient during thermally deteriorated sliding).

[0074] Furthermore, in the dry friction base material 21 of this embodiment, the fixed shape portion 22 has a notched shape, which allows the dry friction base material 21 to be easily fixed to the plate 26 while further suppressing damage.

[0075] Furthermore, the dry friction base material 21 of this embodiment is fan-shaped and has fixed shaped portions 22 at both ends, which allows the dry friction base material 21 to be easily fixed to the plate 26 while further suppressing damage.

[0076] The dry friction material 25 of this embodiment includes a plate 26 for a torque limiter device 31 and a dry friction substrate 21 fixed on the surface of the plate 26, with the plate 26 having a fixing shape portion 27 for fixing on its surface, and the dry friction substrate 21 having a fixed shape portion 22 that engages with the fixing shape portion 27. This allows the segmented dry friction substrate 21 to be fixed on the surface of the plate 26 while suppressing damage. Therefore, a stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate that is thicker than the plate is press-fitted into a through-hole in the plate. As a result, the torque limiter device 31 can exhibit appropriate torque transmission and torque suppression functions.

[0077] Furthermore, in the dry friction material 25 of this embodiment, one dry friction substrate 21 is fixed to the plurality of fixing shapes 27 via the fixed shapes 22. This further prevents the dry friction substrate 21 from being damaged and is fixed to the plate 26.

[0078] According to the torque limiter device 31 of this embodiment, the dry friction material 25 includes a plate 26 that is ring-shaped in a plan view and a dry friction substrate 21 fixed on the surface of the plate 26, with the plate 26 having a fixing shape portion 27 for fixing on its surface, and the dry friction substrate 21 having a fixed shape portion 22 that engages with the fixing shape portion 27. This allows the segmented dry friction substrate 21 to be fixed on the surface of the plate 26 while suppressing damage. Therefore, a more stable friction coefficient can be ensured compared to conventional devices in which a dry friction substrate that is thicker than the plate is press-fitted into a through-hole in the plate. As a result, the torque limiter device 31 can exhibit appropriate torque transmission and torque suppression functions.

[0079] Furthermore, in the torque limiter device 31 of this embodiment, the cover plate 26A and the push plate 26B are arranged so that the surfaces to which the dry friction substrate 21 is fixed face 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, the plates 26A, 26B and the friction plate 32 rotate relative to each other (slip), and the transmission torque transmitted between the plates 26A, 26B and the friction plate 32 is suppressed to be equal to or less than a predetermined value.

[0080] According to the fixing structure of the dry friction substrate 21 of this embodiment, a fixing portion 27 having a convex shape for fixing is provided on the surface of the plate 26, and a fixed portion 22 shaped to engage with the fixing portion 27 is provided on the dry friction substrate 21, and the dry friction substrate 21 is fixed on the surface of the plate 26 by the engagement relationship between the fixing portion 27 and the fixed portion 22. This makes it possible to easily fix the segmented dry friction substrate 21 on the surface of the plate 26 while suppressing damage. Therefore, a stable friction coefficient can be ensured compared to conventional methods in which a dry friction substrate thicker than the plate is press-fitted into a through-hole in the plate. As a result, the torque limiter device 31 can exhibit appropriate torque transmission and torque suppression functions.

[0081] Furthermore, in the fixing structure of the dry friction substrate 21 of this embodiment, the dry friction substrate 21 is fixed to the plate 26 only by an engaging relationship without being joined. This allows the dry friction substrate 21 to be fixed to the plate 26 without the need for an adhesive application process, thereby reducing costs.

[0082] Furthermore, in the fixing structure of the dry friction substrate 21 of this embodiment, the dry friction substrate 21 is formed in a fan shape and has fixed shaped portions 22 at both ends, and the dry friction substrate 21 is locked to the multiple fixing shaped portions 27 via the fixed shaped portions 22. This makes it possible to easily fix the dry friction substrate 21 to the plate 26 while further suppressing damage to the dry friction substrate 21.

[0083] 1, 21: Dry friction base material; 2, 22: Fixed shape portion; 5, 25: Dry friction material; 6, 26: Plate; 6A, 26A: Cover plate; 6B, 26B: Push plate; 7, 27: Fixed shape portion; 11, 31: Torque limiter device; 12, 32: Friction plate.

Claims

1. A dry friction substrate to be fixed onto a surface of a plate for a torque limiter device, the dry friction substrate having a fixed shape for said fixing.

2. The dry friction base material according to claim 1, wherein the shape of the fixed shape portion is a concave shape, a convex shape, or a notched shape.

3. The dry friction base material according to claim 1 or 2, the shape of which in a plan view is a circle, an ellipse, a polygon or an arc.

4. The dry friction base material according to claim 1 or 2, which is button-shaped and has the fixed shape portion provided in the center.

5. The dry friction base material according to claim 1 or 2, which is sector-shaped and has the fixed shape portions at both ends.

6. A dry friction material comprising: a plate for a torque limiter device; and a dry friction base material fixed onto a surface of the plate, wherein the plate has a fixing shape for said fixing on the surface, and the dry friction base material has a fixed shape that engages with the fixing shape.

7. The dry friction material according to claim 6, wherein the fixed shape portion has a convex or concave shape.

8. A dry friction material according to claim 6 or 7, wherein the plate has a ring-like shape in a plan view, and a plurality of the dry friction substrates are provided parallel to an inner peripheral edge or an outer peripheral edge of the plate.

9. The dry friction material according to claim 8, wherein the dry friction base materials are arranged at equal intervals.

10. The dry friction material according to claim 8, wherein one of said dry friction substrates is fixed to one of said fixed shape portions.

11. The dry friction material according to claim 8, wherein one of the dry friction substrates is fixed to a plurality of the fixing shaped portions via the fixed shaped portions.

12. A torque limiter device equipped with a dry friction material, the dry friction material comprising a plate having a ring-shaped shape in a plan view, and a dry friction base material fixed onto a surface of the plate, the plate having a fixing shape portion for said fixing on the surface, and the dry friction base material having a fixed shape portion that engages with the fixing shape portion.

13. The torque limiter device according to claim 12, wherein a plurality of said dry friction substrates are provided parallel to the inner periphery or the outer periphery of said plate.

14. The torque limiter device according to claim 13, wherein the dry friction substrates are disposed at equal intervals.

15. The torque limiter device according to claim 12, wherein the plate is a cover plate or a push plate.

16. A torque limiter device as described in claim 15, wherein the cover plate and the push plate are arranged with their surfaces facing each other to which the dry friction base material is fixed, and a friction plate is disposed between the cover plate and the push plate in a state of contact with the dry friction base material.

17. A fixing structure for fixing a dry friction base material onto a surface of a plate for a torque limiter device, wherein a fixing shaped portion having a convex or concave shape for the fixing is provided on the surface of the plate, and a fixed shaped portion having a shape that engages with the fixing shaped portion is provided on the dry friction base material, and the dry friction base material is fixed onto the surface of the plate by the engaging relationship between the fixing shaped portion and the fixed shaped portion.

18. A fixing structure for a dry friction base material according to claim 17, wherein the dry friction base material is fixed to the plate only by the engagement relationship without being joined.

19. The fixing structure for dry friction material according to claim 17 or 18, wherein the dry friction base material is formed in a button shape and the fixed shape portion is provided in the center, and one of the dry friction base materials is fixed to one of the fixed shapes via the fixed shape portion.

20. The fixing structure for a dry friction material according to claim 17 or 18, wherein the dry friction base material is formed in a sector shape and has the fixed shaped portions at both ends, and the dry friction base material is engaged with a plurality of the fixed shaped portions via the fixed shaped portions.

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