JP2018109432A - Disc rotor for disc brake and its assembling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fixing strength and to dispense with right and left independent designing without causing undesired thermal deformation of a disc rotor, in the disc rotor and its assembling structure.SOLUTION: A disc rotor 1 for a disc brake including first and second discs 1a, 1b, a number of fins 1c connecting the disc opposed faces, and a number of ventilation passages 1d formed among the fins, further has a plurality of flange projections 1e, 1g disposed at equal angular intervals in a circumferential direction of an inner peripheral edge in each of the first and second discs and projecting from the inner peripheral edge to a radial inner side, each of flange projections 1f of the first disc and each of flange projections 1g of the second disc have the same shape and are paired at opposed positions, and bolt holes 1f, 1h in which a bolt 4 can be penetrated, are respectively formed on the paired flange projections of both discs.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disc brake device for braking a brake by pressing a brake pad against a rotating disc rotor, and more particularly to a structure of a disc rotor.

  A disk brake device is well known as a brake device for automobiles. A disc brake device is a device that generates friction by sandwiching a disc rotor, which is a metal disk that rotates with the axle, with a brake pad with a friction material, and brakes the disc rotor by stopping the rotation of the disc rotor. is there.

  FIG. 6 is a perspective view of an example of a conventional disk rotor assembly structure. FIGS. 7A and 7B are perspective views of main components constituting the disk rotor assembly structure of FIG. 8A and 8B are a side sectional development view and a side sectional view of the disk rotor assembly structure of FIG.

  The disc rotor assembly structure 110 includes a disc rotor 101, a bell housing 102, a bobbin 103, bolts 104, and nuts 105. The disk rotor 101 is formed with a ventilation passage for realizing efficient cooling. The bell housing 102 is used as an attachment member to the axle. The disk rotor assembly 110 rotates with the axle.

  As shown in FIG. 7A, the disk rotor 101 includes an outer disk 101a (arranged outside in the vehicle body) and an inner disk 101b (arranged inside in the vehicle body), which are a pair of annular sliding plates, and these disks. A plurality of wall-shaped fins 101c that connect the opposing surfaces of each other, and a ventilation passage 101d formed between adjacent fins (only a part is indicated by a dotted line in FIG. 7A). Each fin 101c extends substantially radially from the outer peripheral edge to the inner peripheral edge of both disks 101a, 101b, and thus each ventilation passage 101d is the same. A curved ventilation passage 101d as in the illustrated example is also known (for example, Patent Document 1).

  The disk rotor 101 is further provided with a plurality of flange protrusions 101e arranged at equal angular intervals in the circumferential direction of the inner peripheral edge of the outer disk 101a. Each flange protrusion 101e protrudes radially inward from the inner peripheral edge of the outer disk 101a by a predetermined length, and is formed with a bolt hole 101f that is a through hole. A recess is formed between adjacent flange protrusions 101e. On the other hand, the flange protrusion is not provided in the inner disk 101b.

  As shown in FIG. 7B, the bell housing 102 has a housing main body 102a having a circular peripheral edge, and has a substantially disc shape in the illustrated example. The center of the housing body 102a is formed with a center hole 102b, which is a through-hole for an axle, and a bolt hole 102c for fixing to the axle (the shape of the housing body 102a is not limited to this example and is various). The housing main body 102a is provided with a plurality of flange protrusions 102d arranged at equiangular intervals in the circumferential direction on the periphery thereof. Each flange protrusion 102d protrudes from the peripheral edge of the housing main body 102 to the outside in the radial direction by a predetermined length, and is formed with a notch 102e cut out from the outer edge to the inside in the radial direction. A bobbin 103, which is an auxiliary component for fixing, is inserted and installed in the notch 102e. The bobbin 103 includes a through-hole through which the bolt passes and a pair of flange portions for placing the bobbin 103 so as to straddle the notch portion 102.

  As shown in the developed view of FIG. 8A and the immediate cross-sectional view of FIG. 8B, the disc rotor 101 and the bell housing 102 are fixed by the bobbin 103, the bolt 104, and the nut 105 as follows. First, the flange protrusions 101e of the disc rotor 101 are overlapped with each other so that the flange protrusions 102d of the bell housing 102 are aligned, and the positions of the former bolt holes 101f and the latter notch portions 102e are aligned. The bobbin 103 is inserted and installed in the notch 102e of the bell housing 102. Next, the bolt 104 is passed through the bolt hole 101f and the bobbin 103 (notch portion 102e of the bell housing 101) from the back side of the outer disk 101a, and fastened by the nut 105 on the front side of the bell housing 101.

  As shown in FIG. 8B, in this conventional example, fixing to the bell housing 102 is performed only on one side (the upper side in the figure) of the disk rotor 101, that is, using only the outer disk 101a. Such a configuration is conventionally known (Patent Document 2 and the like).

JP 2000-74109 A JP 2006-144854 A

However, the conventional disk rotor assembly structure 110 that is fixed to the bell housing 102 using only the outer disk 101a of the disk rotor 101 has the following problems.
Since the outer disk 101a and the inner disk 101b are different in shape, the expansion state due to frictional heat during operation is different, so that deformation stress due to heat is generated in the disk rotor 101. In this case, deformation of the disks 101a and 101b includes deformation in the axial direction. That is, in FIG. 8B, the both ends of the disc rotor 101 are warped in either the vertical direction. In order to prevent the bell housing 102 and the disk 101a from solidifying due to this deformation, the thickness t1 of the bell housing 102 shown in FIG. 8 is made thinner than the thickness t2 of the bobbin 103 and a play is provided between the two. However, since the distance between the brake pad and the disk surface is increased by the amount of play, there is a problem that the brake braking time becomes longer or the brake must be depressed again.
-Since the asymmetric fixing is performed only with the outer disk 101a, the fixing portions are not evenly arranged, and it is necessary to select a material having sufficient strength to ensure the fixing strength.
As shown in FIG. 6, when a ventilation path 101d having a predetermined curved shape is provided, separate left and right disk rotors 101 having a mirror image symmetry are required from the correspondence with the rotation directions of the left and right wheels. .

  In view of the above situation, in the disk rotor for the disk brake, in particular the ventilated disk rotor and its assembly structure, the disk rotor does not undergo undesired thermal deformation, improves the fixing strength, and does not require separate left and right designs. It aims to be.

In order to achieve the above object, the present invention provides the following configuration. In addition, the code | symbol in a parenthesis is a code | symbol in drawing mentioned later, and attaches | subjects it for reference.
The first aspect of the present invention is that the annular first and second discs (1a, 1b) facing each other with a predetermined interval and the opposing surfaces of the first and second discs (1a, 1b) A disk rotor for a disk brake comprising a plurality of wall-shaped fins (1c) for connecting each other and a plurality of ventilation passages (1d) formed between two adjacent fins (1c) ( 1)
In each of the first and second discs (1a, 1b), a plurality of flange protrusions (1e, 1g) provided at equal angular intervals in the circumferential direction of the inner peripheral edge and projecting radially inward from the inner peripheral edge Have
Each of the plurality of flange protrusions (1f) on the first disk (1a) and each of the plurality of flange protrusions (1g) on the second disk (1b) have the same shape and face each other. The flange protrusions (1e, 1g) which form a pair at the position and which form a pair of both discs are formed with bolt holes (1f, 1h), respectively.
The second aspect of the present invention is the above disk rotor (1),
A bell housing (2) fixed to the disk rotor (1), and an assembly structure (10) comprising:
The bell housing (2) is provided at equal angular intervals in the circumferential direction of the peripheral edge of the bell housing main body (2a) and protruding outward in the radial direction from the peripheral edge of the bell housing main body (2a). A plurality of flange protrusions (2d) and a notch (2e) cut out from the outer edge of each flange protrusion (2d),
The disk rotor (1) is disposed between the flange protrusions (1f, 1h) of the flange protrusions (1e, 1g) forming a pair of both disks and the flange protrusions (1e, 1g) forming a pair. The bell housing (2) is fixed by a bolt (4) penetrated through a notch (2e) of the flange protrusion (2d).

  In the disk rotor of the present invention, the first disk and the second disk are opposed to each other by providing a plurality of flange protrusions with bolt holes on both the first disk and the second disk to form a symmetrical shape. The flange protrusion of the bell housing can be disposed between the flange protrusions, and can be fixed from the outside of the first disk and the second disk with bolts and nuts. As a result, it is possible to realize strong and even fixation without causing undesirable thermal deformation during operation. In addition, regardless of the shape of the ventilation passage, there is no need to make separate disc rotors for the left and right, and the amount of inventory can be reduced.

FIG. 1 is a perspective view schematically showing a configuration example of a disc rotor assembly structure according to the present invention. FIGS. 2A and 2B are a perspective view and a side view of the disk rotor in the disk rotor assembly structure of FIG. 3A and 3B are a perspective view and a side view of a bell housing in the disc rotor assembly structure of FIG. 4 is a side sectional view of the disk rotor assembly structure of FIG. 5A and 5B are a development view of the disk rotor assembly structure of FIG. 1 and a perspective view of a fixing auxiliary part. FIG. 6 is a perspective view of an example of a conventional disk rotor assembly structure. FIGS. 7A and 7B are perspective views of main components constituting the disk rotor assembly structure of FIG. 8A and 8B are a side sectional development view and a side sectional view of the disk rotor assembly structure of FIG.

  Hereinafter, embodiments of a disk rotor and an assembly structure thereof according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view schematically showing a configuration example of a disc rotor assembly structure according to the present invention. FIGS. 2A and 2B are a perspective view and a side view of the disk rotor in the disk rotor assembly structure of FIG. 3A and 3B are a perspective view and a side view of a bell housing in the disc rotor assembly structure of FIG. 4 is a side sectional view of the disk rotor assembly structure of FIG. 5A and 5B are a development view of the disk rotor assembly structure of FIG. 1 and a perspective view of a fixing auxiliary part.

  The disc rotor assembly structure 10 includes a disc rotor 1, a bell housing 2, a bobbin 3 (see FIGS. 4 and 5), a bolt 4, and a nut 5 (see FIGS. 4 and 5). Usually these are made of metal. The disk rotor 1 is a ventilated disk rotor formed with a ventilation passage for realizing efficient cooling. The bell housing 2 is used as an attachment member to the axle. The disk rotor assembly structure 10 rotates with the axle.

  As shown in FIGS. 1 and 2, the disk rotor 1 includes a first disk 1a and a second disk 1b, which are a pair of annular sliding plates facing each other at a predetermined interval. The opposing surfaces of these disks 1a and 1b are connected by a large number of wall-shaped fins 1c. Each fin 1c extends substantially radially between the inner periphery and the outer periphery of both disks 1a, 1b. In the disk rotor 1, the disks 1a and 1b and the fins 1c are usually manufactured integrally by casting.

  Between adjacent fins 1c, a ventilation passage 1d penetrating between the inner peripheral edge and the outer peripheral edge of the disk is formed. In FIG. 2, only a part of the large number of ventilation passages 1d is indicated by dotted lines. In the illustrated example, the shape of the ventilation passage 1d is inclined and curved with respect to the radial direction of the disc. However, the application target of the present invention is limited to the disc rotor having the ventilation passage having such a shape. Absent. For example, the present invention can also be applied to a disk rotor in which the ventilation passage has a radial shape along the radial direction of the disk and is inclined with respect to the radial direction of the disk.

  The disk rotor 1 is further provided with a plurality of flange protrusions 1e arranged at equal angular intervals in the circumferential direction of the inner peripheral edge of the first disk 1a. The flange protrusion 1e has the same thickness as the first disk 1a and extends on the same surface as the first disk 1a. In the illustrated example, the flange protrusions 1e are provided at seven locations, but the number of flange protrusions 1e is appropriately set. Each flange protrusion 1e protrudes inward in the radial direction from the inner peripheral edge of the first disk 1a, and in the illustrated example, the whole is substantially trapezoidal. In this case, the tapered tip of each flange protrusion 1e forms a linear inner edge, and a gentle curve is drawn from both ends of the flange protrusion 1e to the inner periphery. Between the adjacent flange protrusions 1e, the inner peripheral edge of a predetermined length is left as it is, and is a recess. The shape of the flange protrusion 1e is not limited to the illustrated example. Further, each flange protrusion 1e of the first disk 1a is formed with a bolt hole 1f which is a through hole.

  The disk rotor 1 is further provided with a plurality of flange protrusions 1g arranged at equal angular intervals in the circumferential direction of the inner peripheral edge of the second disk 1b. The flange protrusion 1g has the same thickness as the second disk 1b and extends on the same surface as the second disk 1b. Each flange protrusion 1g provided on the second disk 1b is formed to be paired with each flange protrusion 1e provided on the first disk 1a. The flange protrusion 1e and the flange protrusion 1g which make a pair are the same shape, and exist in the position which mutually opposes. When viewed from the direction of the rotation axis C, the flange projections 1e and the flange projections 1g making a pair overlap each other.

  Bolt holes 1h, which are through holes, are also formed in the flange protrusions 1g of the second disk 1b. The bolt holes 1f and 1h of the flange protrusion 1e and the flange protrusion 1g that form a pair are formed at positions where one bolt can pass through both. That is, the bolt holes 1f and 1h are formed on one shaft.

  The disk rotor 1 according to the present invention is symmetrical with respect to the central section in the thickness direction perpendicular to the rotation axis C by providing the first disk 1a and the second disk 1b with a plurality of flange protrusions 1e and 1g that are paired with each other. It has a shape. This symmetry with the central cross section as the symmetry plane is established regardless of the shape of the ventilation passage. Therefore, the disc rotor 1 of the present invention does not need to be manufactured separately for the left and right sides of the vehicle body. As a result, the stock amount of the disk rotor 1 can be reduced.

  In addition, since the disk rotor 1 has a symmetrical shape, heat during operation is evenly transmitted, so that deformation stress due to heat hardly occurs. In particular, in the disk rotor 1 of the present invention, there is no warping in the axial direction due to heat as shown in the prior art of FIG. 8 described above, but only in the circumferential direction or radial direction. The deformation in the circumferential direction or the radial direction is symmetric in the entire disk rotor 1.

  As shown in FIGS. 1 and 3, the bell housing 2 has a substantially dome-shaped housing body 2a. The bell housing 2 is made of, for example, aluminum or stainless steel. The peripheral edge of the housing body 2a is circular. The housing main body 2a has a center hole 2b, which is a through hole for an axle, and a bolt hole 2c for fixing to the axle at the center. The housing main body 2a is provided with a plurality of flange protrusions 2d arranged at equiangular intervals in the circumferential direction on the periphery thereof. The number of the flange protrusions 2d is the same as the number of the flange protrusions 1e and 1g in the disk rotor 1 to which the bell housing 2 is attached. That is, in the illustrated example, there are seven locations. Each flange projection 2d protrudes radially outward from the periphery of the housing body 2a by a predetermined length, and the overall shape is substantially trapezoidal. The protruding lengths of the flange protrusions 1e and 1g in the disk rotor 1 and the protruding length of the flange protrusion 2d in the bell housing 2 may be the same or different. Each protrusion length is set according to required stress and cooling performance. Similarly, the respective widths in the circumferential direction are set as necessary.

  The flange projection 2d of the bell housing 2 is further formed with a notch 2e that is notched radially inward from its outer edge. The bobbin 3 which is an auxiliary component for fixing shown in FIGS. 4 and 5 is inserted and installed in the notch 2e. In the illustrated example, the bobbin 3 is a part that allows a fixing bolt to pass therethrough. By forming a notch in the flange protrusion 2d of the bell housing 2 instead of a through hole, play can be given to the assembly accuracy with the disc rotor 1.

  The bell housing body 2a of the bell housing 2 is substantially dome-shaped in the illustrated example, but the shape of the bell housing body 2a is various because it is appropriately designed according to the vehicle body to be used.

  An example of the bobbin 3 will be described with reference to FIG. The bobbin 3 is a cylindrical part in which a bolt hole 3a penetrating on the shaft is formed, and has a pair of plate-like flanges 3b projecting at a predetermined length on both sides at the upper end. When the bobbin 3 is inserted and installed in the notch 2e of the flange protrusion 2d of the bell housing 2, the pair of flanges 3b formed on the bobbin 3 are placed on flat surfaces on both sides with the notch 2e interposed therebetween. In the illustrated example, the cylindrical portion of the bobbin 3 includes a rectangular tube portion and a cylindrical portion, but the shape of this portion is appropriately designed. As another example of the bobbin, the bobbin hole may be threaded, and two bolts may be screwed from both ends of the bobbin and fixed.

  Also in the present invention, the thickness t1 of the bell housing 2 is made thinner than the thickness t2 of the bobbin 3 so that the influence of the thermal expansion deformation in the circumferential direction or the radial direction of the disk rotor 1 does not affect the bell housing 2. Although provided and fixed, there is no warping in the axial direction of the disk rotor as in the prior art, so that the play can be reduced as compared with the prior art. Therefore, by using the disc rotor 1 of the present invention, the brake braking distance and the braking time can be shortened compared to the conventional one, and a reliable brake operation can be performed.

  A method for assembling the disk rotor 1 and the bell housing 2 and a disk rotor assembly structure obtained after the assembly will be described with reference to FIGS.

  When the bell housing 2 is attached to the disc rotor 1, first, the bobbin 3 is inserted and installed in each notch portion 2 e of the bell housing 2. Next, the bell housing 2 is fitted into the central portion of the disc rotor 1 so that the flange projections 1e and 1g of the disc rotor 1 and the flange projection 2d of the bell housing 2 do not overlap each other when viewed from the axial direction. In other words, the flange protrusion 2d of the bell housing 2 enters the recess between the adjacent flange protrusions 1e and 1g of the disk rotor 1.

  Next, in a state where the flange protrusion 2d of the bell housing 2 is positioned between the first disk 1a and the second disk 1b of the disk rotor 1, the bell housing 2 is appropriately rotated around the axis, thereby the flange protrusion 2d. Is disposed between the flange protrusions 1e and 1g. Thereby, the bolt hole 1f of the flange protrusion 1e of the first disk 1a, the bolt hole 3a of the bobbin 3 arranged in the notch 2e of the flange protrusion 2d of the bell housing 2, and the bolt of the flange protrusion 1g of the second disk 1b. The hole 1h is positioned on one straight line.

  Thereafter, one bolt 4 is passed through each bolt hole located on one straight line, and is fastened and fixed by a nut 5. 1 and 4 show the disc rotor assembly structure after fixing. In the disk rotor assembly structure of the present invention, the flange protrusion 2d of the bell housing is disposed between the flange protrusions 1e and 1g of the two disks 1a and 1b of the disk rotor 1, and one bolt 4 is passed through them. Since it is fixed with the nut 5, it is possible to realize a strong and uniform fixing.

  In the illustrated example, the position of the flat zenith portion of the housing body 2a of the bell housing 2 is substantially the same as the position of the bell housing 102 in the conventional example shown in FIGS. 6 and 8B. The height of the dome-shaped part is set. The height of the substantially dome-shaped portion is not limited to this position, and the shape of the housing body 2a is not limited to this shape.

  In the illustrated example, the housing body 2a of the bell housing 2 is mounted so as to protrude toward the first disk 1a of the disk rotor 1, but conversely, the housing body 2a protrudes toward the second disk 1b. It can also be attached to. Select according to whether it is mounted on the left or right of the car body. In addition, when the shape of the ventilation path is a shape that does not need to be distinguished depending on the left and right, the bell housing 2 may be attached to either the first or second disk 1a, 1b.

  The effects of the disk rotor and the assembly structure of the present invention described above are summarized as follows.

  Since the disk rotor of the present invention has a symmetrical shape with respect to the central cross section perpendicular to the rotation axis, heat during operation is evenly transmitted, so that deformation stress due to heat hardly occurs.

  Furthermore, since the disk rotor has a symmetric shape, it is not necessary to produce separate disk rotors for the left and right sides of the vehicle body, and the amount of inventory can be reduced.

  In the present invention, when the bell housing is attached to the disk rotor, the fixed portion of the bell housing is disposed between the fixed portions of both disks of the disk rotor. In addition, the bolt penetrates not only one disk but also both disks and is fixed with a nut. As a result, the bell housing is fixed to both the disks, so that a stronger and uniform fixed state can be obtained as compared with the case where the bell housing is fixed to only one of the disks as in the conventional example.

  Compared to the case where the bell housing is fixed only to the disk on one side, in the present invention, the number of fixing points is doubled, and an equal fixing force can be obtained both in the circumferential direction and in the axial direction. As a result, since the overall strength is enhanced as compared with the conventional case, the choice of materials for the disk rotor and the bell housing can be expanded.

  The embodiment of the present invention described above is merely an example, and various modifications other than these can be made by design changes, and these are also included in the present invention.

10 Disc rotor assembly 1 Disc rotor (ventilated disc rotor)
1a 1st disc 1b 2nd disc 1c Fin 1d Ventilation passage 1e, 1g Flange projection 1f, 1h Bolt hole 2 Bell housing 2a Housing body 2b Center hole 2c Bolt hole 3 Bobbin 3a Bolt hole 3b Flange 4 Bolt 5 Nut C Rotating shaft

Claims (2)

Annular first and second discs (1a, 1b) facing each other at a predetermined interval, and a large number of wall-shaped fins connecting the opposing surfaces of the first and second discs (1a, 1b) A disc rotor (1) for a disc brake comprising (1c) and a plurality of ventilation passages (1d) formed between two adjacent fins (1c),
In each of the first and second discs (1a, 1b), a plurality of flange protrusions (1e, 1g) provided at equal angular intervals in the circumferential direction of the inner peripheral edge and projecting radially inward from the inner peripheral edge Have
Each of the plurality of flange protrusions (1f) on the first disk (1a) and each of the plurality of flange protrusions (1g) on the second disk (1b) have the same shape and face each other. A disc rotor characterized in that a pair of bolts (1f, 1h) are formed in the flange protrusions (1e, 1g) which form a pair at a position and a pair of both discs. A disk rotor (1) according to claim 1;
A bell housing (2) fixed to the disk rotor (1), and an assembly structure (10) comprising:
The bell housing (2) is provided at equal angular intervals in the circumferential direction of the peripheral edge of the bell housing main body (2a) and protruding outward in the radial direction from the peripheral edge of the bell housing main body (2a). A plurality of flange protrusions (2d) and a notch (2e) cut out from the outer edge of each flange protrusion (2d),
The disk rotor (1) is disposed between the flange protrusions (1f, 1h) of the flange protrusions (1e, 1g) forming a pair of both disks and the flange protrusions (1e, 1g) forming a pair. A disc rotor assembly structure characterized by being fixed by a bolt (4) passed through a notch (2e) of a flange protrusion (2d) in a bell housing (2).

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