JP2017101927A - Roller for chassis dynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller for chassis dynamometer capable of simplifying a mounting/dismounting work of a roller cam to/from an attachment.SOLUTION: A roller 7 for chassis dynamometer includes: a roller body 1; an attachment 2; and a roller cam 3 as major components. The roller body 1 and the attachment 2 are fastened by a fastening bolt. The attachment 2 has a plurality of projections 22 each of which protrudes along a protruding direction perpendicular to a radial direction of the roller 7, and the roller cam 3 has a plurality of grooves G32 each of which engages with the projections when mounted on to the attachment 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chassis dynamometer roller used for a chassis dynamometer, on which wheels of an automobile are placed.

  A chassis dynamometer is conventionally used when a test related to driving of an automobile is performed. Moreover, when performing the said test, it is necessary to fix a motor vehicle with respect to a chassis dynamometer. That is, it is necessary to place the wheel of the automobile to be tested on the chassis dynamometer roller used in the chassis dynamometer.

  The chassis dynamometer roller includes a main roller portion having a plurality of attachments (attachment portions) in a part of the outer peripheral portion, and a roller cam that is detachably attached to each of the plurality of attachments. In the case of this configuration, a plurality of types of roller cams are prepared in advance, and the roller cams can be attached to the attachment by appropriately selecting from a plurality of types of roller cams.

  As a roller structure of a chassis dynamometer roller having the roller cam, for example, Patent Document 1 discloses a roller structure in which a thick plate member is selectively provided on the outer peripheral portion.

JP-A-5-142100

  However, for the purpose of preventing deformation due to centrifugal force during the rotation of the chassis dynamometer roller and ensuring its strength, the conventional roller cam is relatively large in size and heavy in weight, so that the roller cam can be attached to and detached from the attachment. It is practically impossible to perform the attaching / detaching operation of the roller cam including it only by hand. As a result, in order to perform the attaching / detaching operation of the roller cam, there is a problem in that it takes time and labor for the attaching / detaching operation because a separate operation such as using a crane is required.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a roller for a chassis dynamometer that simplifies the work of attaching and detaching the roller cam to and from the attachment part. To do.

  A chassis dynamometer roller according to a first aspect of the present invention is a chassis dynamometer roller on which a wheel of an automobile is placed, and a roller main portion having an attachment portion on an outer peripheral portion, and a detachable attachment to the attachment portion. A roller cam that can be mounted, and the mounting portion has a protruding portion that protrudes along a protruding direction that intersects the radial direction of the roller, and the roller cam protrudes when mounted on the mounting portion. It has the groove part fitted to a part, It is characterized by the above-mentioned.

  In the chassis dynamometer roller according to the first aspect of the present invention, the groove portion of the roller cam is fitted to the protrusion portion of the attachment portion when attached to the attachment portion. By this fitting, it is possible to effectively suppress the phenomenon in which the roller cam is deformed by the radial centrifugal force generated when the roller rotates.

  As a result, the weight of the roller cam can be reduced, so that an effect of simplifying the attaching operation to the attaching portion of the roller cam and the removing operation from the attaching portion can be achieved.

It is explanatory drawing which shows typically the conventional test environment performed by fixing a motor vehicle to a chassis dynamometer. It is explanatory drawing which shows typically the structure of the roller of embodiment with which the roller cam was attached. It is a perspective view which shows the whole structure of the attachment shown in FIG. It is explanatory drawing which shows the whole structure of the attachment shown in FIG. It is explanatory drawing which shows the whole structure of the roller cam shown in FIG. It is a perspective view which shows the whole structure of the roller cam shown in FIG. In this Embodiment, it is explanatory drawing which shows typically the intermediate | middle stage of the attachment process to the attachment of a roller cam. It is explanatory drawing which shows typically the 1st modification of embodiment. It is explanatory drawing which shows the 2nd modification of embodiment. It is explanatory drawing which shows typically the structure of the conventional roller to which the roller cam was attached.

<Principle of the invention>
FIG. 1 is an explanatory diagram schematically showing a conventional test environment in which an automobile is fixed to a chassis dynamometer. FIG. 1 (a) is a top view showing a state where the automobile 52 is fixed, FIG. 1 (b) is a side view showing a state where the automobile 52 is fixed, and FIG. It is explanatory drawing which shows typically the side structure of the roller 7 for chassis dynamometers. Each of FIGS. 1A to 1C shows an XYZ orthogonal coordinate system.

  As shown in FIG. 1, chassis dynamometer rollers 7 (hereinafter simply abbreviated as “rollers”) are exposed at four locations from a pit cover 51 serving as a floor surface. And in each roller 7, the wheel (tire) 56 of the motor vehicle 52 is mounted, respectively. The pit cover 51 is provided with lashing posts 53 having a total of four predetermined heights in front of and behind the automobile 52. The chain 52 (or belt) 54 is used to fix the automobile 52 to each securing post 53 (see FIG. 1).

  In the configuration example of FIG. 1, a microphone 55 for sound measurement is also provided in the pit cover 51. While the roller 7 is rotated under the test environment shown in FIG. 1, the sound of the automobile 52 traveling on the roller 7 (sound felt by a person) is collected by the microphone 55, and the sound evaluation test can be performed.

  As shown in FIG. 1C, four roller cam forming regions R3 are provided at equal intervals on the outer periphery of the roller 7, and attachments and roller cams, which will be described in detail later, are formed in each roller cam forming region R3.

  FIG. 10 is an explanatory view schematically showing the structure of a conventional roller 70 to which a roller cam 73 is attached. The structure shown in FIG. 10 corresponds to the structure of the roller cam forming region R3 in the roller 7 of FIG. FIG. 10 shows an XYZ orthogonal coordinate system.

  As shown in the figure, the roller 70 has a roller main body 71, an attachment 72, and a roller cam 73 as main components. The roller body 71 has a recessed area at a position corresponding to the roller cam forming area R3 shown in FIG. 1 (c), and the attachment 72 is fastened to the recessed area. The roller main body 71 and the attachment 72 are fastened by fastening bolts (not shown) to constitute the main part of the roller.

  The attachment 72 has a U-shaped recess having an upper portion opened in a cross-sectional view. The roller cam 73 is placed in a form of being accommodated in the recess of the attachment 72, and the outer circumferential surface width direction (Y direction) of the roller 70. In the both end regions, the four fastening bolts 75 reach the bottom surface of the attachment 72 via the roller cam 73 and are fastened to the attachment 72, whereby the attachment 72 and the roller cam 73 are attached. Conversely, the roller cam 73 can be removed from the attachment 72 by removing all the bolts 75.

  Thus, the roller cam 73 can be detachably attached to the attachment 72 by using the fastening bolt 75.

  An upper surface convex portion 80t having a height of about 5 mm and a width of about 5 mm is selectively provided on the outer peripheral surface of the roller cam 73 along the outer peripheral width direction (Y direction) of the roller 70. That is, the roller cam 73 has an upper surface convex portion 80t protruding outward in the radial direction of the roller 70 (roller body 71) on the upper surface portion.

  However, for the purpose of preventing deformation due to centrifugal force during rotation of the roller 70 and ensuring the strength, the roller cam 73 has a relatively large size and a heavy weight. Specifically, the formation length (the length along the circumferential direction of the roller 70 (direction close to the X direction)) is about 320 mm, and the formation width (the length of the roller 70 in the width direction (the Y direction in the figure)). Is about 800 mm, the thickness (the length of the roller 70 in the axial direction (Z direction)) is about 65 mm, and the weight of the roller cam 73 is about 45 kg even if it is made of aluminum having a relatively low specific gravity.

  Accordingly, it is practically impossible to manually attach / detach the roller cam 73 to / from the attachment 72 (attachment portion) and to remove the attachment from the attachment 72, and it is necessary to use a crane separately. There is a problem that it takes time to attach and detach the roller cam 73. The chassis dynamometer roller 7 according to the embodiment described below has solved this problem.

<Embodiment>
FIG. 2 is an explanatory view schematically showing the structure of the chassis dynamometer roller 7 to which the roller cam 3 is attached. The structure shown in FIG. 2 corresponds to the roller cam forming region R3 in FIG. FIG. 2 shows an XYZ orthogonal coordinate system.

  As shown in the figure, the chassis dynamometer roller 7 has a roller body 1, an attachment 2 (attachment portion), and a roller cam 3 as main components. The roller body 1 has a recess at a position corresponding to the roller cam formation region R3 shown in FIG. 1 (c), and the attachment 2 is fastened to the recess. The roller main body 1 and the attachment 2 are fastened by fastening bolts (not shown in FIG. 2) to constitute a main roller portion having the attachment 2 selectively on the outer peripheral portion. The roller body 1 and the attachment 2 are each made of aluminum as a constituent material.

  The attachment 2 has protrusions 22 (a plurality of protrusions 22) protruding along a protrusion direction (X direction) which is a direction orthogonal to the radial direction of the roller 7 (a direction close to the Z direction in FIG. 2). The roller cam 3 has a groove portion G32 (a plurality of groove portions G32) that fits with the protrusion 22 when attached to the attachment 2.

(Attachment 2)
The attachment 2 reflects the concave portion of the roller body 1 and has a concave shape (excluding a portion where a protrusion 22 described later is formed) whose upper portion is opened in a cross-sectional view.

  3 is a perspective view showing the overall structure of the attachment 2. FIG. 4 is an explanatory view showing the overall structure of the attachment 2. FIG. 4 (a) is a top view and FIG. 4 (b) is FIG. 4 (a). It is AA sectional drawing. 3 and 4 show XYZ orthogonal coordinate systems, respectively.

  As shown in FIG. 3, the attachment 2 includes a bottom surface portion 20 and a pair of side surface portions 21 erected in the height direction (Z direction) from both ends in the width direction (X direction) of the bottom surface portion 20. Each of the portions 21 is formed along the longitudinal direction (Y direction) of the bottom surface portion 20.

  A plurality of deformation preventing projections 22 projecting inward are selectively provided at the upper ends of the pair of side surfaces 21. At this time, the plurality of projecting portions 22 provided on one side surface portion 21 and the plurality of projecting portions 22 provided on the other side surface portion 21 satisfy the positional relationship facing each other (the corresponding projecting portion 22 Provided so that the formation positions in the longitudinal direction (Y direction) coincide. Thus, as shown in FIG. 4, a plurality of protrusions 22 are provided that protrude from the left side surface 21 in the + X direction in the + X direction and protrude in the −X direction from the right side surface 21 in the drawing. A plurality of protrusions 22 projecting with a length P2 are provided.

  The plurality of protrusions 22 have a formation length W2 (first formation width) along the outer circumferential surface width direction (Y direction; first direction) of the roller 7, and the protrusions adjacent to each other among the plurality of protrusions 22. 22 and 22 are discretely formed with a distance D2 (first distance) therebetween. Therefore, a gap region S22 having a formation length of distance D2 is provided between the adjacent protrusions 22 and 22. The protruding direction (X direction) of the plurality of protrusions 22 described above is orthogonal to the Y direction (first direction) that is the width direction of the outer peripheral surface of the roller 7.

  As described above, the plurality of protrusions 22 selectively formed on the upper ends of the side surfaces 21 each have a formation length W2 along the Y direction (first direction) which is the width direction of the outer peripheral surface of the roller 7. The plurality of protrusions 22 are discretely formed with a distance D2 along the Y direction.

  Further, four bolt holes 25 for fastening the roller cam are provided along the short direction (X direction) at both ends of the bottom surface portion 20 in the longitudinal direction (Y direction).

  Then, by providing three roller body fastening bolt holes 26 along the short direction at each of the five locations along the longitudinal direction of the bottom surface portion 20, a total of 15 bolt holes 26 are provided on the bottom surface portion 20. Provided. In addition, the circle | round | yen of the outer periphery of the bolt hole 26 is a hole for head storage of the fastening bolt which is not shown in figure.

  Therefore, the roller main body 1 and the attachment 2 are provided with fastening bolts through the bolt holes 26 provided in the bottom surface portion 20, thereby forming a roller cam having a concave shape in cross section as shown in FIG. 2. The attachment 2 can be fastened in the region R3.

(Roller cam 3)
5A and 5B are explanatory views showing the entire structure of the roller cam 3. FIG. 5A is a top view, and FIG. 5B is a cross-sectional view taken along line BB in FIG. 5A. FIG. 6 is a perspective view showing the entire structure of the roller cam 3. 5 and 6 show XYZ orthogonal coordinate systems, respectively.

  As shown in FIG. 5B, the roller cam 3 is classified into a roller cam main portion 3M and an upper surface portion 30 on the roller cam main portion 3M. The upper surface portion 30 is longer in the formation width (length in the X direction) than the roller cam main portion 3M, and has a hook-shaped portion 30h in which both ends of the formation width extend outward from the roller cam main portion 3M. Specifically, the upper surface portion 30 is provided with hook-shaped portions 30h extending from the roller cam main portion 3M to the left side (−X direction) and the right side (+ X direction) in FIG.

  Furthermore, the upper surface portion 30 is selectively provided with an upper surface convex portion 30t having a height of about 5 mm and a width of about 5 mm along the longitudinal direction of the roller cam 3 on the center portion of the surface.

  On the other hand, a plurality of projecting portions 32 for forming groove portions G32 projecting outward are selectively provided in lower regions of the side surface portions 31 of the roller cam main portion 3M facing each other. At this time, the plurality of projecting portions 32 provided on one side surface portion 31 and the plurality of projecting portions 32 provided on the other side surface portion 31 satisfy the positional relationship facing each other (of the corresponding projecting portions 32). Provided so that the formation positions in the longitudinal direction (Y direction) coincide.

  As described above, the roller cam 3 according to the present embodiment is provided with the plurality of projecting portions 32 projecting from the left side surface portion 31 in FIG. 5 with the projecting length P3 in the −X direction. A plurality of projecting portions 32 projecting from the 31 in the + X direction with a projecting length P3 are provided. In addition, the protrusion length P3 of the protrusion part 32 is set to the same length as the protrusion length P2 of the protrusion part 22 in order to implement | achieve fitting with the protrusion part 22 and the groove part G32.

  When the roller cam 3 is attached to the attachment 2, the plurality of protrusions 32 have a formation length W <b> 3 (second formation width) along the outer circumferential surface width direction (Y direction; first direction) of the roller 7. The protrusions 32 adjacent to each other among the protrusions 32 are discretely formed with a distance D3 (second distance) therebetween. Therefore, a gap region S32 having a formation length of distance D3 is provided between the adjacent protrusions 32 and 32.

  Therefore, as shown in FIG. 5B, in the upper region of the side surface portion 31, a plurality of groove portions G32 are selectively formed between the plurality of protruding portions 32 and the flange-shaped portion 30h of the upper surface portion 30 above. The At this time, when the roller cam 3 is attached to the attachment 2, the groove portions G32 and the protrusion portions 22 that correspond to each other between the plurality of groove portions G32 and the plurality of protrusion portions 22 are provided as shown in FIG.

  Thus, each of the plurality of groove portions G32 has a formation length W3 along the Y direction (first direction), and the plurality of groove portions G32 are discrete from each other at a distance D3 (second distance) along the Y direction. It is formed.

  Further, four bolt holes 35 for fastening the roller cam are provided along the short direction (X direction) at both ends in the longitudinal direction (Y direction) of the upper surface portion 30 of the roller cam 3. The bolt hole 35 is provided through the roller cam 3 (the upper surface portion 30 and the roller cam main portion 3M). A circle on the outer periphery of the bolt hole 35 is a hole for storing the head of the bolt 5.

(Mounting the roller cam 3 to the attachment 2)
FIG. 7 is an explanatory view schematically showing an intermediate stage of the operation of attaching the roller cam 3 to the attachment 2 in the present embodiment. FIG. 7A is an explanatory view showing the temporary placement process, and FIG. 7B is an explanatory view showing the temporary attachment process. 7 (a) and 7 (b) are top views corresponding to the CC cross section of FIG. 4 (b). In addition, CC cross section means the cross section which cut out XY plane in the height a little lower than the topmost part of the side part 21 of the attachment 2. FIG.

  Note that the formation length W2 and distance D2 of the plurality of protrusions 22 formed on the attachment 2 and the formation length W3 and distance D3 of the plurality of protrusions 32 (constituting the bottom of the groove G32) formed on the roller cam 3 are as follows. And satisfying the dimensional condition “W2 ≦ D3, W3 ≦ D2”.

  Using the attachment 2 and the roller cam 3 that satisfy the above dimensional conditions, a temporary arrangement process is performed in which the roller cam 3 is arranged on the bottom surface portion 20 of the attachment 2 from above the attachment 2 (+ Z direction).

  Specifically, as shown in FIG. 7A, a plurality of gap regions S22 provided between the plurality of protrusions 22 of the attachment 2 and a plurality of protrusions 32 of the roller cam 3 (the bottom of the groove G32 of the groove) In a plan view, and a plurality of gap regions S32 provided between the plurality of protrusions 32 of the roller cam 3 and a plurality of protrusions 22 of the attachment 2 are overlapped in a plan view. Then, the temporary placement process is executed.

  Since the attachment 2 and the roller cam 3 satisfy the above dimensional conditions, the plurality of protrusions 22 of the roller cam 3 are replaced with the plurality of protrusions 22 of the attachment 2 as shown in FIG. 7A. Can be temporarily arranged on the plurality of gap regions S22 in the bottom surface portion 20 without hitting the bottom.

  Thereafter, as shown in FIGS. 7A and 7B, the roller cam 3 is moved in the movement direction M3 along the Y direction (first direction) after the provisional arrangement process, whereby a plurality of attachments 2 are attached. Temporary attachment processing of fitting between the corresponding protrusions 22 and the grooves G32 among the protrusions 22 and the plurality of grooves G32 (having the protrusions 32 at the bottom) of the roller cam 3 can be executed.

  After the temporary attachment process is executed, the eight bolt holes 25 provided in the attachment 2 and the eight bolt holes 35 provided in the roller cam 3 are completely coincident with each other in plan view.

  Finally, after the temporary attachment processing, the fastening bolt 5 is inserted into the corresponding bolt hole 25 and the bolt hole 35, and the fastening processing by the bolt 5 is executed, so that the roller cam 3 is attached to the attachment 2 as the attachment portion. The fastening completion process which completes the attachment to the attachment 2 of the roller cam 3 can be performed by fastening.

  As a result, there is an effect that the operation of attaching the roller cam 3 to the attachment 2 can be realized by a relatively simple process that can be executed manually by the temporary placement process, the temporary attachment process, and the attachment completion process described above.

  In addition, the removal operation | work from the attachment 2 of the roller cam 3 is realizable by performing the temporary arrangement | positioning process, temporary attachment process, and attachment completion process which were mentioned above in the reverse order and the reverse process content. That is, the removal process of the bolt 5, the temporary removal process of the roller cam 3 (the process of returning from the state shown in FIG. 7B to the state shown in FIG. 7A), and the removal completion process (the state shown in FIG. 7A) This can be performed by lifting the roller cam 3 upward and completely removing it from the attachment 2.

  As a result, the removal work of the roller cam 3 from the attachment 2 is performed as described above, thereby producing an effect that can be realized by a relatively simple process that can be performed manually.

(First modification)
FIG. 8 is an explanatory view schematically showing a first modification of the present embodiment. FIG. 8 shows a DD cross section of FIG.

  As shown in the figure, the bottom surface 22b of the protrusion 22 of the attachment 2 and the surface 32s of the protrusion 32 of the roller cam 3 each have a gradient in the Z direction with respect to the XY plane including the Y axis. That is, each of the plurality of protrusions 22 and the plurality of protrusions 32 (bottom part of the groove part G32) has a bottom surface 22b and a surface 32s that are in contact with each other between the corresponding protrusions 22 and protrusions 32 with respect to the Y direction. The same gradient is provided.

  Thus, the first modification is characterized in that the bottom surface 22b of the protrusion 22 and the surface 32s of the protrusion 32 are provided with a gradient at the same angle.

  Since the first modified example has the above-described characteristics, the roller cam 3 can be smoothly moved in the movement direction M3 (Y direction) during the temporary attachment process. As a result, the roller cam 3 is attached to the attachment 2. Work can be done more easily.

(Effects etc.)
As described above, in the chassis dynamometer roller 7 of the present embodiment, the attachment 2 as the attachment portion is in a direction (X direction in FIG. 2) intersecting the radial direction of the roller 7 (Z direction in FIG. 2). The roller cam 3 has a groove portion (a plurality of groove portions G32) that fits with the protrusion portion when attached to the attachment 2.

  The chassis dynamometer roller 7 of the present embodiment has the above-described characteristics, so that the plurality of groove portions G32 of the roller cam 3 and the plurality of protrusion portions 22 of the attachment 2 are fitted when the roller cam 3 is attached to the attachment 2. To do. By fitting between the plurality of protrusions 22 and the plurality of grooves G32, it is possible to effectively suppress the phenomenon in which the roller cam 3 is deformed by the centrifugal force in the radial direction of the roller 7 generated when the roller 7 rotates.

  As a result, the weight of the roller cam 3 can be reduced as compared with the conventional configuration. Specifically, when the constituent material of the roller cam 3 is aluminum as in the roller cam 73 shown in FIG. 10, the formation length (the length along the circumferential direction of the roller 7 (almost along the X direction)) The width (the length in the width direction (Y direction) of the roller 7) is about 620 mm, the thickness (the length in the axial direction (Z direction) of the roller 7) is about 40 mm, and the weight of the roller cam 3 is about 204 mm. The weight can be reduced to about 9 kg.

  As described above, the roller 7 according to the present embodiment has the above-described characteristics, so that it is possible to reduce the weight of the roller cam 3 and simplify the work of attaching the roller cam 3 to the attachment 2 and removing it from the attachment 2. There is an effect that can.

  Further, by providing the upper surface convex portion 30t on the upper surface portion 30 of the roller cam 3, it is possible to test the operation status of the automobile 52 in an environment in which the roller cam 3 periodically travels on the convex portion.

  Furthermore, since the attachment 2 is detachably attached to the roller cam forming region R3 provided on the outer peripheral surface of the roller body 1, the attachment 2 can be appropriately replaced as necessary to prevent deterioration of the attachment 2. The maintenance of the entire roller 7 can be improved.

(Second modification)
FIG. 9 is an explanatory view showing the entire structure of a roller cam 3X as a second modification, wherein FIG. 9 (a) is a top view and FIG. 9 (b) is an EE cross-sectional view of FIG. 9 (a). .

  As shown in FIG. 9, the upper surface portion 30 of the roller cam 3X of the second modified example is selectively provided with a 30 upper surface concave portion 30d having a depth of about 5 mm and a width of about 5 mm along the longitudinal direction in the center portion. That is, the roller cam 3 </ b> X in the second modification has an upper surface recess 30 d that is recessed inward in the radial direction of the roller 7 on the surface (outer peripheral surface) of the upper surface portion 30.

  Since other configurations are the same as those of the roller cam 3 shown in FIG. 5, the same reference numerals are given and description thereof is omitted as appropriate.

  As in the second modification, by providing the upper surface concave portion 30d on the upper surface portion 30 of the roller cam 3X, it is possible to test the operation status of the automobile 52 in an environment in which the roller cam 3X periodically travels on the concave portion.

  As described above, by properly using the roller cam 3 having the upper surface convex portion 30t and the roller cam 3X having the upper surface concave portion 30d, it is possible to test the operation status of the automobile 52 under various driving environments.

<Others>
In the present embodiment, the attachment 2 has the protrusions (a plurality of protrusions 22) that protrude along the direction orthogonal to the radial direction of the roller 7 (the X direction in FIG. 2). If it is a direction that intersects the radial direction of the roller 7, the effect of suppressing the phenomenon in which the roller cam 3 is deformed by the centrifugal force in the radial direction of the roller 7 can be exhibited.

  In the present embodiment, the roller cam 3 (FIGS. 5 and 6) having the upper surface convex portion 30t and the roller cam 3X (FIG. 9) having the upper surface concave portion 30d are shown as the roller cams. In addition to 3X, various types of roller cams are conceivable, such as a structure in which the upper surface 30 has an arcuate flat surface with no protrusions or recesses.

  In the present embodiment, the roller main part is constituted by the roller main body 1 and the attachment 2 that is detachably attached to the outer peripheral surface of the roller main body 1. However, the roller main body 1 and the attachment 2 are integrated into a roller. The main part may be adopted.

  In the present embodiment, aluminum is shown as the constituent material of the roller body 1, the attachment 2 and the roller cam 3, but other materials such as iron may be used as the constituent material.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Roller body 2 Attachment 3, 3X Roller cam 5 Bolt 7 Chassis dynamometer roller 22 Projection part 30 Upper surface part 30t Upper surface convex part 30d Upper surface concave part 31 Side surface part 32 Projection part 52 Automobile 56 Wheel G32 Groove part

Claims (5)

A chassis dynamometer roller on which an automobile wheel is placed,
A roller main portion having a mounting portion on the outer periphery;
A roller cam detachably attached to the attachment portion;
The attachment portion has a protrusion that protrudes along a protrusion direction that is a direction that intersects the radial direction of the roller, and the roller cam has a groove that fits into the protrusion when attached to the attachment portion. Characterized by the
Chassis dynamometer roller. The chassis dynamometer roller according to claim 1,
The roller cam has a convex portion protruding outward in the radial direction of the roller on the outer peripheral surface or a concave portion recessed inward in the radial direction of the roller.
Chassis dynamometer roller. The chassis dynamometer roller according to claim 1 or 2,
The main part of the roller is
A roller body (1);
Including the attachment portion detachably attached to the outer peripheral surface of the roller body,
Chassis dynamometer roller. The chassis dynamometer roller according to any one of claims 1 to 3,
The protrusion in the attachment portion includes a plurality of protrusions, and the protrusion direction of each of the plurality of protrusions intersects a first direction that is the outer peripheral surface width direction of the roller, and the plurality of protrusions are respectively Having a first formation width along the first direction, and the plurality of protrusions are discretely formed at a first distance along the first direction;
The groove portion of the roller cam includes a plurality of groove portions corresponding to the plurality of protrusion portions, and each of the plurality of groove portions has a second formation width along the first direction when attached to the attachment portion. The plurality of grooves are discretely formed from each other at a second distance along the first direction,
The second formation width is set to be equal to or less than the first distance, and the first formation width is set to be equal to or less than a second distance.
Chassis dynamometer roller. The chassis dynamometer roller according to claim 4,
Each of the plurality of protrusions and the plurality of groove portions is provided with a predetermined gradient with respect to the first direction on the surfaces that contact each other between the corresponding protrusion portions and the groove portions.
Chassis dynamometer roller.

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