JP4857806B2 - Gear noise measuring device - Google Patents

Description

  The present invention uses a dynamo simulating an engine and a load to drive a specimen such as an automobile transmission in a test room as in an actual use state, and to measure gear noise (noise) generated during driving. The present invention relates to a gear noise measuring device for evaluation.

FIGS. 11 and 12 are a front view and a plan view of a conventional gear noise measuring device A ′ in a state where gear noise of a transmission T of an FF (Front-Engine / Front-Drive) vehicle as a specimen is measured. . The gear noise measuring device A ′ includes three dynamos D _{1 to} D _{3 including a} first dynamo D ₁ acting as a simulation engine and second and third dynamos D ₂ and D ₃ acting as a simulation load. Yes. On the common base Vc, the bases V ′ and V ₀ are installed at predetermined intervals in the longitudinal direction. The bases V ′ have the axes DS of the first and third dynamos D ₁ and D _{3. 1} and DS ₃ are arranged at predetermined intervals in the horizontal direction and the vertical direction (height direction) corresponding to the arrangement of the input shaft TS ₀ and the second output shaft TS ₂ of the transmission T, respectively, and the base V ₀ Corresponds to the arrangement of the first output shaft TS ₁ of the transmission T, and the second dynamo D ₂ is arranged. The shaft ends of the shafts DS ₁ , DS ₂ , DS ₃ of the _{first to third} dynamometers D ₁ , D ₂ , D ₃ are supported by intermediate bearings 53, 54, 55, respectively. , 55 and each axis DS ₁ exposed between the dynamo _{D 1, D 2, D 3} , DS 2, DS 3 is covered with each shaft cover 56, 57, 58. Inside each of the shaft covers 56, 57, 58, a connection coupling and a torque meter (none of which is shown) for measuring transmission torque are arranged coaxially. In the above description, the “dynamo axis” is a concept including not only an axis provided directly on the dynamo but also an (intermediate) axis connected to the axis via a coupling.

Transmission T is a specimen is attached to the outside of the mounting surface 59a of the base V ₀ and facing subjected supported perpendicularly to the ends of the side piece mounting bracket 59 at the base V '. The input shaft TS ₀ of the transmission T is connected to the shaft DS ₁ of the first dynamo D ₁ by a positive coupling, and the first and second output shafts TS ₁ , TS ₂ of the transmission T are second and third Are respectively connected to the shafts DS ₂ and DS ₃ of the dynamos D ₂ and D ₃ by flanges. Further, other sound generation sources (first to third dynamos D _{1 to} D ₃ , intermediate bearings 53, 54, 55, etc.) excluding the transmission T as a specimen are connected to the bases V ′ and V ₀ . The soundproof covers C ′ and C ₀ each having substantially the same planar shape and having a substantially rectangular parallelepiped box shape whose bottom is opened. Further, microphones M for measuring gear noise emitted from the transmission T, which is a specimen, are arranged in the vicinity of the specimen, at a total of four locations on the front, top, and both sides of the transmission T, which is the specimen. Yes.

However, since the first and third dynamos D ₁ and D ₃ mounted on the base V ′ on the side where the specimen is mounted are used as vibration sources and transmitted to the base V ′, the following problems are encountered. Had occurred.
(1) Noise leaks from the exposed portion of the base V ′ that is not covered by the soundproof cover C ′, resulting in a measurement error.
(2) Since the vibration of the base V ′ is transmitted to the soundproof cover C ′ and generates noise from the soundproof cover C ′ itself, a measurement error occurs.
(3) Since the vibration of the base V ′ is transmitted to the specimen mounting bracket 59 and the specimen mounting bracket 59 itself generates noise, a measurement error occurs.
(4) Due to resonance of the base V ′, vibration and noise increase at a specific rotation speed, resulting in a measurement error. Since the base V ′ has a large area, an attempt to avoid resonance by increasing rigidity increases the weight unnecessarily. Moreover, no matter how it is devised, the physical limit derived from the characteristics of the base V ′ material itself cannot be exceeded.
The same problem occurs with the other base V ₀ , but the influence on the measurement error of the noise of the specimen is much smaller than that of the base V ′ on the side where the specimen is attached. If this happens, it will not be a big problem.

As a classic means for preventing the above-described vibration of the base, there is a method of supporting the base using a number of vibration isolators using a cylindrical vibration isolator as described in Patent Document 1, Since the structure directly absorbs vibration by the vibration proof rubber, there is a problem that a large number of cylindrical vibration proof rubbers are indispensable for enhancing the vibration proofing effect.
Japanese Utility Model Publication No. 5-50037

  An object of the present invention is to improve the measurement accuracy of gear noise emitted from a specimen by suppressing the generation of vibrations by devising the structures of the base and the specimen mounting bracket in the gear noise measuring apparatus.

In order to solve the above-mentioned problem, the invention of claim 1 is fixed substantially perpendicular to the base for mounting the dynamo for the simulation engine and the simulation load mounted on the base and the specimen. Only the specimen mounting bracket and the specimen attached to the specimen mounting bracket are exposed to cover all of the noise generating bodies so as to prevent gear noise generated from all the noise generating bodies such as each dynamo. For this purpose, a set of soundproof covers arranged opposite to each other with a predetermined interval is provided, and the specimen is driven by the simulated engine dynamo in a state where a load is generated on the specimen by the simulated load dynamo. a gear noise measuring device for measuring the resulting gear noise, the base is divided into two parts along the thickness direction, each base divided bodies viscoelastic resin of the upper and lower Is Awa attached to back-to-back with, the lower base split body, equipment installation portion protruding warship shape upward is integrally formed, the device installation unit, fitted on which is formed in the upper base split body It is characterized by being fitted in the joint space in a penetrating state via the viscoelastic resin and protruding upward .

According to the first aspect of the present invention, a gear noise measuring device is configured, and a base for mounting a vibration generation source such as a dynamo is divided into two in the thickness direction, and the upper and lower base divided bodies are made of viscoelastic resin. is Awa attached in the back-to-back through, the the lower base split body, equipment installation portion protruding warship shape upward is integrally formed, the device installation unit formed in the upper base split body It is fitted in the fitting space through the viscoelastic resin in a penetrating state and protrudes upward, between the upper and lower divided base bodies that are back-to-back, and the equipment installation portion and the upper base division of the lower base divided body Since the viscoelastic resin is interposed between the body fitting spaces , the base has a vibration damping structure. That is , since the upper and lower base divided bodies are bonded back to back through the viscoelastic resin, the vibration of one of the upper and lower base divided bodies on the side where the device mounting portion is integrally formed is attenuated by the other. This is a basic vibration control structure. For this reason, since the vibration of the base itself is small, noise (vibration sound) leaking from the exposed portion of the base is reduced, vibration transmitted to the soundproof cover is also reduced, and vibration sound from the soundproof cover itself is also reduced. Therefore, generation | occurrence | production of harmful noise other than the gear noise emitted from a specimen can be suppressed, and the measurement precision of the gear noise of a specimen is improved.

  According to a second aspect of the present invention, in the first aspect of the invention, the upper and lower base divided bodies are a bottom plate portion or a top plate portion, and a side plate integrally formed over the entire circumference of the bottom plate portion or the top plate portion. And ribs integrally formed on the bottom plate portion or the top plate portion, and at each corner portion of the upper and lower base divided bodies, ribs are formed in a direction substantially dividing the angle of formation of each corner portion. It is characterized by being.

  At the time of vibration of a polygonal base such as a square shape, the corner portion tends to have the largest amplitude. Therefore, in order to enhance the vibration damping effect of the base, it is necessary to suppress an increase in the amplitude of the corner portion. According to the invention of claim 2, the ribs are formed at the corner portions of the upper and lower base divided bodies of the bipartite structure along the thickness direction so as to bisect the angle of formation of the corner portions. Furthermore, the rigidity of the corner portions of the upper and lower base divided bodies, which are likely to have a large amplitude when vibration is generated, is particularly high, and a high vibration damping effect is achieved only by the rib arrangement direction.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the specimen mounting bracket is configured by bonding two members having substantially the same rigidity through a viscoelastic resin. It is said.

  According to the invention of claim 3, the part of the specimen mounting bracket can be made into a vibration damping structure, and the measurement accuracy of the gear noise of the specimen decreases due to the vibration sound of the specimen mounting bracket closest to the specimen. Can be prevented.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the soundproof cover is supported on an upper surface of the base via a vibration-proof rubber, and a lower end portion of the soundproof cover is a side surface of the base. It is characterized by being folded back inside.

  According to the invention of claim 4, since the soundproof cover is supported on the upper surface of the base via the vibration isolating rubber, the vibration of the base is hardly transmitted to the soundproof cover. Moreover, since the lower end part of the soundproof cover covers the side surface of the base and is folded back to the inside, it is possible to effectively prevent or suppress leakage of sound emitted from the base to the outside. For this reason, it can prevent that the measurement precision of the gear noise emitted from a test piece falls by the vibration of a soundproof cover, or the reflected sound from a base.

The present invention is bisected base in the thickness direction be installed by mounting the vibration source of the dynamo or the like, each base divided body of the upper and lower are Awa attached in the back-to-back through the viscoelastic resin, the lower base split body Is formed integrally with a device installation portion protruding upward in a warship shape, and the device installation portion is inserted through the viscoelastic resin into the fitting space formed in the upper base divided body. Viscoelasticity between the upper and lower divided base bodies that are fitted and projecting upward and back to back, and between the equipment mounting portion of the lower base divided body and the mated space of the upper base divided body, respectively. Since the resin is interposed , the base has a damping structure. For this reason, since the vibration of the base itself is small, noise (vibration sound) leaking from the exposed portion of the base is reduced, vibration transmitted to the soundproof cover is also reduced, and vibration sound from the soundproof cover itself is also reduced. Become. Therefore, generation | occurrence | production of harmful noise other than the gear noise emitted from a specimen can be suppressed, and the measurement precision of the gear noise of a specimen is improved.

  Hereinafter, the present invention will be described in more detail with reference to the best mode.

1 to 8 show a gear noise measuring apparatus A according to the present invention for measuring gear noise of a transmission T of an FF vehicle as a specimen. FIG. 1 is a front view of a gear noise measuring device A in which the soundproof covers C ₁ and C ₀ are broken in a state where a transmission T of an FF vehicle as a specimen is attached, and FIG. 2 is also a plan view. 3 is a perspective view of the state in which each test device is mounted on the base V ₁ as viewed from the diffusion baffle body B ₁ side, and FIG. 4 is also from the back side (the third dynamo D ₃ side). 5 is a perspective view seen from the bottom side, FIG. 6 is also a plan view, and FIG. 7 is a base V ₁ , a bracket substrate 18, first and third views. each dynamo D _1, D ₃ of a perspective view of a separated state soundproof cover C ₁ or the like, FIG. 8 (b) is a sectional view taken along line X-X of Figure 6, the (b) is another it is a view corresponding to definitive line X-X sectional view of FIG. 6 in the base V ₁ 'of. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the part demonstrated by the "prior art", and avoids duplication description, and demonstrates only the original part of this invention. The soundproof cover C ₁ has a substantially trihedral surface facing the other soundproof cover C ₀ covering the second dynamo D _{2 and the} like. That is, the soundproof cover C ₁ has a substantially rectangular parallelepiped box shape, but the facing surface 10 is formed on the upper inclined surface 1, the left and right inclined surfaces 2, and the portions corresponding to the ridge lines of the respective inclined surfaces 2. It is a non-planar surface composed of each part of the front surface of the diffusion baffle body B ₁ disposed in the formed opening 3 and is not parallel to the opposing surface 62 of another soundproof cover C _0. ing.

As shown in FIGS. 3 to 7, the planar shape of the base V ₁ corresponds to the opposing surface 10 of the soundproof cover C ₁ being formed in a substantially trihedral solid shape, and a pair of In addition to the long side 11 and one short side 12, a pair of inclined sides 13 corresponding to the respective inclined surfaces 2 of the opposing surface 10 of the soundproof cover C ₁ , parallel to the short side 12, and the soundproof cover C _The parallel short side 14 corresponding to _one opening 3 is provided. Further, the base V ₁ is divided into two along the thickness direction so as to improve vibration resistance, and the upper and lower base divided bodies V ₁₁ and V ₁₂ are laminated via the viscoelastic resin R [ See FIG. 8 (a)]. That is, the upper base divided body V ₁₁ includes a bottom plate portion 31 corresponding to the planar shape of the soundproof cover C ₁ , and a side plate portion 32 integrally formed on the entire peripheral edge of the bottom plate portion 31 excluding the parallel short side 14. In order to fit the device mounting portion 38 of the lower base divided body V ₁₂ , a frame rib-like fitting rib 33 having an opening only in the portion of the parallel short side 14 is provided. A cover installation portion 34 for installing the soundproof cover C ₁ is formed at a total of six locations including the four corner portions of the upper base divided body V ₁₁ and the middle portion of both long sides 11. The part is integrally formed with a radiating rib 36 in a direction that bisects the angle of the corner part between the cover installation part 34 and the fitted rib 33. Space surrounded by the connection rib 33 has a fitting target space 35 for causing the fitting insert the device mounting portion 38 of the lower base divided bodies V _12.

On the other hand, the lower base divided body V ₁₂ is obtained by turning the upper base divided body V ₁₁ upside down so that the measuring devices such as the first and third dynamos D ₁ and D ₃ are arranged on the top surface of the top plate portion 37. A device installation portion 38 for installation is provided protruding upward. Equipment mounting portion of the lower base split body V ₁₂ 38 is fitted and inserted through the viscoelastic resin R into the fitting space 35 of the upper base split body V _11. That is, as shown in FIG. 8 (b), the viscoelastic into the space portion of the slight between the side surface of the upper base split body device mounting portion 38 of the connection rib 33 and the lower base split body V ₁₂ of V ₁₁ Resin R is filled. With this structure, the upper and lower base divided bodies V ₁₁ and V ₁₂ are positioned in all directions and are not displaced. Further, the lower base divided body V ₁₂ includes a frame-shaped rib 39 corresponding to the fitted rib 33 of the upper base divided body V ₁₁ , a side plate portion 41, a radiation rib 42, and an installation surface portion 43 [ See FIGS. 5 and 8 (A)]. The frame-shaped rib 39 is disposed immediately below the peripheral edge of the device installation portion 38 which is the optimum position for reinforcing the device installation portion 38 from below. The installation surface portion 43 is provided at a position corresponding to the cover installation portion 34 of the upper base divided body V ₁₁ , and between the installation surface portions 43 on the lower end surface of the side plate portion 41, soundproofing is achieved in the installation state of the base V _1. A space in which the bent piece 5 at the lower end of the cover C ₁ can be bent inward is formed. Setting surface section 43 of the lower base split body V ₁₂ is installed on a common base Vc via the anti-vibration rubber 44 [see FIG. 9 (b)].

As described above, the upper and lower base divided bodies V ₁₁ and V ₁₂ constituting the base V ₁ are each composed of the bottom plate portion 31 or the top plate portion by the ribs 33, 36, 39 and 42 and the peripheral side plate portions 32 and 41. The base V ₁ is reduced in weight by reinforcing 37 to ensure the necessary strength. The base V ₁ is formed between the bottom plate portion 31 of the upper base divided body V ₁₁ and the top plate portion 37 of the lower base divided body V ₁₂ , and the fitted rib 33 and the lower base divided portion of the upper base divided body V _11. The viscoelastic resin R is interposed between each side of the device installation portion 38 of the body V _{12 and} the device installation portion 38 of the lower base division body V ₁₂ is fitted to the fitting rib 33 of the upper base division body V _11. In a state of being fitted and inserted, the structure of being vertically stacked and the arrangement of the ribs provided on the upper and lower base divided bodies V ₁₁ and V ₁₂ , particularly the arrangement of the radiating ribs 36 and 42 at each corner, The base V ₁ has a damping structure. That is, the upper and lower base divided bodies V ₁₁ and V ₁₂ constituting the base V ₁ have the same degree of rigidity, and are attached in a state where they are stacked back to back via the viscoelastic resin R. For this reason, one vibration of each of the upper and lower base divided bodies V ₁₁ and V ₁₂ has a vibration suppression structure that is suppressed by the other. For this reason, the vibrations caused by the rotation of the first and third dynamos D ₁ and D ₃ installed on the device installation part 38 of the lower base divided body V ₁₂ are effectively damped and generated from the base V ₁ itself. The vibration is reduced, and a large vibration is not transmitted to a specimen (transmission T) attached to the adapter 22 described later.

Further, on the front end face of the device mounting portion 38 of the lower base split body V _12, integrally attached to the bracket board 18 becomes vertical, the bracket board 18, right and left pair of inclined struts 19 at its rear side (FIG. 4 Reference). The front of the bracket board 18, the first dynamo D ₁ of the shaft DS ₁ and concentric adapter cylinder 21 have been fixed, on the front end face of the adapter cylindrical unit 21, the transmission T is specimen An adapter 22 for attachment is attached. A part of the intermediate bearing 53 that supports the end portion of the shaft DS ₁ of the first dynamo D ₁ is inserted into the adapter cylindrical body 21. A shaft insertion duct 23 for inserting the second output shaft TS ₂ of the transmission T as a specimen is provided on the extension line of the axis DS ₃ of the third dynamo D _{3 on} the front surface of the bracket substrate 18. And is attached integrally. In the shaft insertion duct 23 through which the second output shaft TS ₂ of the transmission T is inserted, a known soundproofing means is provided in order to prevent the sound generated inside the soundproof cover C _{1 from} leaking to the outside. ing. As a known soundproofing means, for example, a structure in which a large number of soundproofing rings are provided at predetermined intervals on the inner peripheral surface of the shaft insertion duct.

A diffusion baffle body B ₁ is attached to the front surface of the bracket substrate 18 via a viscoelastic resin that also acts as an adhesive in order to eliminate the flat portion of the front surface. It is important that the front surface of the diffusion baffle body B ₁ is composed of the curved surface 4, and the material thereof is not limited, but from the viewpoint of imparting vibration damping to the bracket substrate 18, It is desirable to have the same degree of rigidity. The diffusion baffle body B ₁ is formed by bending a metal plate, and insertion holes 21 a and 23 a for inserting the adapter cylindrical body 21 and the shaft insertion duct 23 are respectively formed at predetermined positions. Yes. The diffusion baffle body B ₁ has the widest width of the portion where the adapter cylindrical body 21 and the shaft insertion duct 23 are arranged in an oblique direction, and the width gradually narrows upward and downward from the portion. It has become.

As shown in FIG. 3 and FIG. 6, a viscoelastic resin R that also acts as an adhesive on the bent portion 20 of the diffusion baffle body B _{1 on} the front surface of the bracket substrate 18 attached perpendicularly to the upper base divided body V _11. Are attached to the bracket substrate 18 by the diffusion baffle body B ₁ , and the adapter cylinder 21 has a length from the surface of the diffusion baffle body B _1. (L) Projects only [see FIG. 1]. The longer the length (L) of the adapter cylinder 21 protruding from the diffusion baffle body B ₁ , the longer the distance of the specimen from the facing surface 10 of the soundproof cover C ₁ , and the influence of reflected sound, which will be described later. Can be reduced. Also, as shown in FIGS. 3, 4 and 9, the base V ₁ is covered with a soundproof cover C ₁ , and a plurality of bent pieces 5 formed integrally with the lower peripheral edge of the lower base divided body V are formed. _When bent to the inner side of the _twelve side plate portions 41, the side plate portions 32 and 41 of the upper and lower base divided bodies V ₁₁ and V ₁₂ are covered with the flange portion 29 at the lower end portion of the soundproof cover C ₁ , thereby And the vibration sound of the _third dynamo D ₁ and D ₃ does not leak to the outside (or the leak rate decreases). Note that the bracket substrate 18 and the diffusion baffle body B ₁ can be superposed by being vibration-insulated via a vibration-proof rubber instead of the viscoelastic resin R.

The opening 3 of the facing surface 10 of the soundproof cover C ₁ is entirely covered by a bracket substrate 18 disposed on the front surface thereof. Diffusing baffle member B ₁ represents, are arranged so as to cover the ridge portions of the pair of left and right side inclined surface 2 of the soundproof cover C _1, because the upper end is to be connected on the inclined surface 1 of the soundproof cover C _1, the diffusion baffle A horizontal plane portion is formed at the upper end of the body B ₁ , and this horizontal plane portion functions as a small article storage section 24 for temporarily placing parts and tools when the transmission T as a specimen is attached to the adapter 22. To do. The soundproof cover C ₁ has a configuration in which a heat insulating material 7 is attached to the inside of the outer plate portion 6, and the lower end surface of the heat insulating material 7 is an upper surface of the base V ₁ (upper base divided body V ₁₁ ). It abuts against the cover installation part 34 via a vibration isolating rubber 45. Incidentally, the covers each device such as a dynamo D _1, D _3, which is mounted on the base V ₁ in soundproof cover C _1, a gap is formed between each side inclined surface 2 and the bracket board 18 of the soundproof cover C ₁ Therefore, the gap is closed by the joint plate 8 (see FIGS. 2 and 3) having a wedge-shaped cross section.

The configuration of the devices such as the second dynamo D ₂ and the intermediate bearing 54 installed on the upper surface of the base V ₀ and the configuration of the soundproof cover C ₀ covering the devices are all as described in “Prior Art”. .

In this way, the base V ₁ has a vibration damping structure, the generated vibration from the base V ₁ itself is reduced, and the vibration transmitted from the base V ₁ to the soundproof cover C ₁ is also reduced. The portion of the adapter 22 that functions as a specimen mounting bracket configured by attaching the diffusion baffle body B ₁ to the front surface of the bracket substrate 18 also has a vibration damping structure, and further, a flange 29 at the lower end of the soundproof cover C _1. a side of the base V ₁ is covered with, in the lower end of the bent piece 5 soundproof cover C ₁ is bent inside the lower end surface of the base V _1, first and mounted to the base V ₁ The vibration sound generated from each of the three dynamos D ₁ , D _{3 and the} like is less likely to leak to the outside. Thereby, the vibration sound emitted from the base V ₁ or the soundproof cover C ₁ is reduced, and the generation of harmful noise other than the gear noise emitted from the transmission T as the specimen can be effectively prevented or suppressed. The measurement accuracy of the gear noise of the specimen is improved.

As shown in FIG. 1 and FIG. 2, as a matter related to the present invention, one of the two soundproof covers C ₁ and C ₀ having a substantially rectangular parallelepiped box shape opposed to each other at a predetermined interval is provided. Since the facing surface 10 of the cover C ₁ is constituted by a substantially trihedron and the facing surfaces 10 and 62 of the two soundproof covers C ₁ and C ₀ are non-parallel, the sound emitted from the specimen is opposed to each other. When the light is primarily reflected on the surface 10, it is diffused to the surroundings, and the above-mentioned “standing wave” can be suppressed. Also in this respect, the measurement accuracy of the gear noise of the specimen is enhanced.

The base V ₁ shown in FIG. 8 (b) 'comprises an upper base split body V _11' to be fit rib 33 'of higher than the height of the connection rib 33 of the upper base split body V ₁₁ to, by increasing the total area covering the sides of the device mounting portion 38 of the lower base split body V _12, Ru der that enhanced vibration damping effect.

FIG. 10 shows a first dynamo V ₁ ′ on a base V ₂ for installing a first dynamo D ₁ ′ used in a gear noise measuring device for a FR (Front-Engine / Rear-Drive) vehicle transmission (not shown). It is a perspective view in the state where was attached. The base V ₂ is composed of upper and lower base divided bodies V ₂₁ and V _{22 in the same} manner as the base V ₁ , but there is only one output shaft for the transmission of the FR vehicle. Since the load is applied from the second dynamo D ₂ installed on the base V ₀ , only the first dynamo D ₁ ′ is installed on the base V ₂ . For this reason, the base V ₂ has a left-right symmetrical shape, and parts corresponding to the base V ₁ and the specimen mounting bracket (adapter 22 part) of the gear noise measuring device A are denoted by the same reference numeral “′”. Only the illustration is made. In FIG. 10, B ₂ indicates a diffusion baffle body.

The bases V ₁ and V ₂ of the _first and _second embodiments are both divided into two in the thickness direction and overlapped with a viscoelastic resin to form a vibration damping structure. Since the common base Vc can be used as a vibration restraining plate, either one of the upper and lower base divided bodies can be omitted.

  Note that the noise to be measured by the gear noise measuring device of the present invention is not limited to the gear noise of the transmission, and can also be applied for measuring and evaluating noise of other automobile parts such as a motor, a shaft, and a joint of an electric vehicle.

FIG. 2 is a front view of a gear noise measuring apparatus A in which the soundproof covers C ₁ and C ₀ are cut away in a state where a transmission T of an FF vehicle as a specimen is attached. It is also a plan view. A state mounted with the test equipment to the base V ₁ is a perspective view from the side of the diffusion baffle member B _1. Also is a perspective view seen from the back side (third side of dynamo D _3). It is the perspective view similarly seen from the bottom side. It is also a plan view. Base V _1, the bracket board 18, the dynamo D ₁ of the first and second 3, D _3, a perspective view of a separated state soundproof cover C ₁ or the like. (B) is a sectional view taken along line X-X in FIG. 6, (b) is a view corresponding to line X-X sectional view of FIG. 6 that definitive to another base V ₁ '. (A) and (B) are enlarged sectional views taken along lines Y ₁ -Y ₁ and Y ₂ -Y _{2 in} FIG. 6, respectively. It is a perspective view of a state where the first dynamo V ₁ 'is mounted to the base V ₂ constituting the gear noise measuring device for measuring gear noise in FR vehicle transmission. It is a front view of the conventional gear noise measuring apparatus A 'in the state which is measuring the noise of the transmission T of FF vehicle. It is also a plan view.

A: Gear noise measuring device
C _1: soundproof cover
D _{1 to} D ₃ : Dynamo (noise generator)
R: Viscoelastic resin
V ₁ and V ₂ : Base
V ₁₁ , V ₂₁ : Upper base divided body
V _12, V _22: lower base split body
5: Folded piece of soundproof cover
18: Bracket substrate
21, 21 ′: Adapter cylinder (specimen mounting bracket)
22, 22 ': Adapter (Specimen mounting bracket)
29: The buttocks of the soundproof cover
31: Bottom plate
32, 41: Side plate part
33: Ribbed rib
36, 42: Radiation rib
37: Top plate
38, 38 ': Equipment installation section
39: Frame-shaped rib

Claims (4)

Each dynamo for the simulated engine and the simulated load mounted on the base, a specimen mounting bracket fixed substantially perpendicular to the base for mounting the specimen, and the above-mentioned specimen mounted on the specimen mounting bracket In order to cover only all of the noise generators so as to prevent gear noise generated from all noise generators such as each dynamo, by exposing only the specimen, a set of opposingly arranged at a predetermined interval With a soundproof cover,
A gear noise measuring device for measuring gear noise generated by driving a specimen with the simulated engine dynamo in a state where a load is generated on the specimen by the simulated load dynamo,
The base is divided into two parts along the thickness direction, each base divided body of the upper and lower are Awa attached in the back-to-back through the viscoelastic resin, the lower base split body, projecting warship shape upward The equipment installation part is integrally formed, and the equipment installation part is fitted in the fitting space formed in the upper base divided body through the viscoelastic resin in a penetrating state and protrudes upward. A gear noise measuring device.   Each of the upper and lower base divided bodies includes a bottom plate portion or a top plate portion, a side plate portion integrally formed over the entire circumference of the bottom plate portion or the top plate portion, and a rib integrally formed on the bottom plate portion or the top plate portion. 2. The gear noise measurement according to claim 1, wherein a rib is formed in each corner portion of each of the upper and lower base divided bodies in a direction that substantially bisects the formation angle of each corner portion. apparatus.   The gear noise measuring device according to claim 1, wherein the specimen mounting bracket is configured by bonding two members having substantially the same rigidity through a viscoelastic resin.   The soundproof cover is supported on the upper surface of the base via a vibration proof rubber, and the lower end portion of the soundproof cover is folded inward so as to cover the side surface of the base. The gear noise measuring device according to claim 1.

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