JP3525488B2 - Gear transmission for load generation of power circulation type test equipment - Google Patents
Gear transmission for load generation of power circulation type test equipmentInfo
- Publication number
- JP3525488B2 JP3525488B2 JP09402794A JP9402794A JP3525488B2 JP 3525488 B2 JP3525488 B2 JP 3525488B2 JP 09402794 A JP09402794 A JP 09402794A JP 9402794 A JP9402794 A JP 9402794A JP 3525488 B2 JP3525488 B2 JP 3525488B2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- torque
- shaft
- piston
- gear transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、各種歯車もしくは歯
車変速機等の供試品の耐久性を試験する動力循環式試験
装置に関し、特にそのトルク負荷を与える負荷発生用歯
車変速機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power circulation type test apparatus for testing the durability of test pieces such as various gears or gear transmissions, and more particularly to a load generating gear transmission for applying a torque load thereto. is there.
【0002】[0002]
【従来の技術】動力循環式試験装置において、油圧によ
りハスバ歯車を軸方向に移動し、供試品にトルクを負荷
する装置は公知であり、例えば実開昭54−17854
8号公報に開示される図2のような装置がある。これ
は、歯車変速機のギヤケース(54)に設置したスラス
ト軸受(51)に油圧系に接続す油室(52)を設け、
この油室(52)に油圧装置から供給される圧油を導き
スラスト軸受(51)に軸方向の荷重を付与する。これ
により、スラスト軸受(51)を介して歯車軸(50)
と一体に結合されたハスバ歯車(53)にスラスト力が
作用し、動力伝達系に負荷トルクが与えられるものであ
る。2. Description of the Related Art In a power circulation type test device, a device for axially moving a helical gear to apply a torque to a sample is known.
There is a device as shown in FIG. This is provided with an oil chamber (52) connected to a hydraulic system in a thrust bearing (51) installed in a gear case (54) of a gear transmission,
Pressure oil supplied from a hydraulic device is introduced into the oil chamber (52) to apply an axial load to the thrust bearing (51). This allows the gear shaft (50) to pass through the thrust bearing (51).
The thrust force acts on the helical gear (53) that is integrally connected with, and a load torque is applied to the power transmission system.
【0003】[0003]
【発明が解決しようとする課題】従来のトルク負荷装置
においては、所定内の軸方向移動量で大きな負荷トルク
を得ようとすると、ハスバ歯車のねじれ角を大きく取
り、そのねじれ角に応じた大きなスラスト力を与える必
要がある。更に、そのスラスト力を与えるための密閉さ
れた油室を、歯車軸の径方向外周位置に配置することか
ら、圧油が作用する油室の受圧面積を大きくすることが
難しく、大スラスト力を付与するためにはその分供給圧
力を高める必要があり、油室のシール部材や油圧発生装
置等の油圧系統は高圧に充分耐え得るものが要求され
る。また、スラスト力を平軸受メタルを介してハスバ歯
車に作用させるため、スラスト軸受部の損失動力が大き
く、スラスト軸受の発熱を冷却させるための潤滑油も多
量に供給する必要がある。このように、従来の装置は大
負荷トルクでの運転に問題があった。この発明は、この
ような従来の問題点を解消し、少ない動力で、しかも低
い作動油圧で、大負荷トルクの運転を可能にする動力循
環式試験装置の負荷発生用歯車変速機を提供することを
目的としてなされたものである。In the conventional torque load device, when trying to obtain a large load torque with a predetermined axial movement amount, the helical angle of the helical gear is made large and a large value corresponding to the twist angle is obtained. It is necessary to give thrust power. Further, since the sealed oil chamber for giving the thrust force is arranged at the outer circumferential position of the gear shaft in the radial direction, it is difficult to increase the pressure receiving area of the oil chamber on which the pressure oil acts, so that a large thrust force is applied. In order to apply it, it is necessary to increase the supply pressure accordingly, and a hydraulic system such as a seal member for the oil chamber and a hydraulic pressure generator is required to be able to withstand high pressure. Further, since the thrust force is applied to the helical gears via the plain bearing metal, the power loss of the thrust bearing portion is large, and it is necessary to supply a large amount of lubricating oil for cooling the heat generation of the thrust bearing. As described above, the conventional device has a problem in operating at a large load torque. The present invention solves the conventional problems described above, and provides a load generating gear transmission of a power circulation type test apparatus that enables operation with a large load torque with a small amount of power and a low hydraulic pressure. It was made for the purpose.
【0004】[0004]
【課題を解決するための手段】即ち、上記の課題を解決
するために、この発明では負荷発生用歯車変速機にハス
バ歯車を用い、この歯車を軸方向に移動して動力循環系
の軸にねじり変形を与え、トルクを負荷するようにした
動力循環式試験装置において、ピニオンを固着した駆動
軸と、ギヤを固着した従動軸と、前記ピニオン及びギヤ
とかみ合う、互いにねじれ方向の異なる2個の中間ギヤ
を固着した中間軸とをそれぞれ平行に配置し、前記中間
軸をラジアル軸受メタルを介して軸方向移動可能にギヤ
ボックスに支持し、一端を開口した筒状のカバーにより
前記中間軸の両端部を覆うとともに、このカバーの他端
内周にピストンを嵌合してピストンとカバーとの間に油
室を設け、この油室に圧油を供給して前記ピストンを押
圧し、ころがり軸受を介してピストン押圧力を前記中間
軸軸端に伝達し、2個の中間ギヤを介して前記ピニオン
とギヤの両方にトルクを負荷するよう負荷発生用歯車変
速機を構成したことを特徴とするものである。That is, in order to solve the above problems, according to the present invention, a helical gear is used for a gear transmission for load generation, and the gear is axially moved to the shaft of a power circulation system. In a power circulation type test device that applies torsional deformation and applies a torque, a drive shaft with a pinion fixed, a driven shaft with a gear fixed, and two driven shafts that are engaged with the pinion and the gear and have different twist directions. The intermediate shaft fixed with the intermediate gear is arranged in parallel with each other, and the intermediate shaft is supported by a gear box so as to be axially movable via a radial bearing metal, and both ends of the intermediate shaft are supported by a cylindrical cover having one end opened. A piston is fitted on the inner circumference of the other end of the cover to provide an oil chamber between the piston and the cover, and pressure oil is supplied to the oil chamber to press the piston to form a rolling shaft. The load generating gear transmission is configured so that the piston pressing force is transmitted to the end of the intermediate shaft via the intermediate gear and torque is applied to both the pinion and the gear via the two intermediate gears. It is a thing.
【0005】[0005]
【作用】上記のように負荷発生用歯車変速機を構成する
ことにより、中間軸端に与えられたスラスト力は、2個
の中間ギヤ及びそれらとかみ合うピニオンとギヤを介し
て駆動軸と従動軸の両方を互いに反対方向にねじる力と
して作用する。このため、一方の軸からのみ負荷トルク
を与える場合に比較して軸のねじり角度が小さくて済
み、ねじりを与えるためのスラスト力が減少する。加え
て、軸端部にスラスト荷重を作用させるので、ピストン
の受圧面積が増加するから、その分供給油圧を下げるこ
とが可能になる。さらに、ころがり軸受でピストンの荷
重を受け軸にスラスト力を付与するので、相対回転に伴
うスラスト受部の損失動力が軽減される。By configuring the load generating gear transmission as described above, the thrust force applied to the end of the intermediate shaft is transmitted to the drive shaft and the driven shaft through the two intermediate gears and the pinion and the gear meshing therewith. Both act as forces that twist both in opposite directions. For this reason, the torsion angle of the shaft can be made smaller than in the case where the load torque is applied from only one shaft, and the thrust force for applying the torsion is reduced. In addition, since the thrust load is applied to the shaft end portion, the pressure receiving area of the piston increases, so that the supplied hydraulic pressure can be reduced accordingly. Further, since the rolling bearing receives the load of the piston and applies the thrust force to the shaft, the power loss of the thrust receiving portion due to the relative rotation is reduced.
【0006】[0006]
【実施例】図1はこの発明の負荷発生用歯車変速機を備
えた動力循環式試験装置の全体系統を示している。図1
に示す如く、動力循環式試験装置は負荷発生用歯車変速
機(1)と、これと向かい合って配置され対で使用する
循環歯車変速機(5)と,カップリング(2)を介して
負荷発生用歯車変速機(1)と循環歯車変速機(5)と
を接続する動力循環系の回転軸(6,7)と、その回転
軸の途中に配置された供試歯車変速機(12)と、カッ
プリング(2)を介して負荷発生用歯車変速機(1)の
駆動軸(13)に連結される原動機(3)とから構成さ
れている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the entire system of a power circulation type test apparatus equipped with a load generating gear transmission of the present invention. Figure 1
As shown in Fig. 1, the power circulation type test apparatus includes a load generation gear transmission (1), a circulation gear transmission (5) arranged facing the load transmission and used in pairs, and a load generation via a coupling (2). A rotary shaft (6, 7) of a power circulation system that connects the gear transmission (1) and the circulating gear transmission (5), and a test gear transmission (12) arranged in the middle of the rotary shaft. , A prime mover (3) connected to the drive shaft (13) of the load generating gear transmission (1) via a coupling (2).
【0007】負荷発生用歯車変速機(1)の歯車は全て
ハスバ歯車であって、駆動軸(13)にはピニオン
(8)が一体に固着され、中間軸(14)に一体に固着
された中間ギヤA(9)とかみ合い、中間軸(14)に
はさらに前記中間ギヤA(9)とはねじれ方向の異なる
中間ギヤB(10)が一体に固着されていて、従動軸
(15)に一体に固着されたギヤ(11)とかみ合って
いる。前記駆動軸(13)、中間軸(14)、及び従動
軸(15)はそれぞれ平行に、軸受を介してギヤボック
ス(35)に回転自在に支承されている。駆動軸(1
3)及び従動軸(15)の軸受にはころがり軸受を使用
しており、中間軸(14)についてはラジアル軸受メタ
ル(4)を用いて軸方向移動可能に支承されている。All gears of the load generating gear transmission (1) are helical gears, and the pinion (8) is integrally fixed to the drive shaft (13) and is integrally fixed to the intermediate shaft (14). An intermediate gear B (10) which meshes with the intermediate gear A (9) and has a different twist direction from the intermediate gear A (9) is integrally fixed to the intermediate shaft (14), and is attached to the driven shaft (15). It meshes with the gear (11) fixed integrally. The drive shaft (13), the intermediate shaft (14), and the driven shaft (15) are rotatably supported by a gear box (35) via bearings in parallel with each other. Drive shaft (1
Rolling bearings are used as the bearings of 3) and the driven shaft (15), and the intermediate shaft (14) is movably supported by a radial bearing metal (4).
【0008】ギヤボックス(35)の中間軸端部には、
その両端を覆うように一方の端が開口した筒状のカバー
(19)が固着され、このカバー(19)の他端内周に
は円筒部が形成され、軸方向滑動自在にピストン(2
0)が嵌合されている。また、カバーの端壁(36)に
は、ピストン(20)が回動不能かつ軸方向滑動自在
に、ピン(24)が設置されている。一方、カバー(1
9)の端壁(36)とピストン(20)との間には密閉
された油室A(21)及び油室B(22)が形成され、
その中央部にはコイルスプリング(16)が設けられて
いて、ピストン(20)は常時中間軸端方向への反力を
受けている。また、端壁(36)の中央には圧油の供給
口(23)が設けられていて、圧油が供給されるとピス
トン(20)に押圧力が作用し、このピストン(20)
と軸端との間に配置され、スラスト荷重を受けることが
可能な円すいころ軸受等のころがり軸受(25)を介し
て中間軸(14)にスラスト力が伝達される。これによ
って中間軸(14)に固着された中間ギヤA(9)及び
中間ギヤB(10)が軸方向に移動し、それらとかみ合
うピニオン(8)及びギヤ(11)を介して動力循環系
の回転軸(6,7)がねじられてトルク負荷が与えられ
る。尚、ピストン(20)が中間軸の両端部に設置して
あるのは、原動機(3)の回転方向に応じて中間軸端に
作用させるスラスト方向を変えるためである。At the end of the intermediate shaft of the gear box (35),
A cylindrical cover (19) having one end opened so as to cover both ends thereof is fixed, and a cylindrical portion is formed on the inner circumference of the other end of the cover (19), and the piston (2) is slidable in the axial direction.
0) is fitted. Further, a pin (24) is installed on the end wall (36) of the cover so that the piston (20) cannot rotate and can slide in the axial direction. On the other hand, the cover (1
A closed oil chamber A (21) and an oil chamber B (22) are formed between the end wall (36) of 9) and the piston (20),
A coil spring (16) is provided in the center of the piston, and the piston (20) is constantly subjected to a reaction force toward the end of the intermediate shaft. Further, a pressure oil supply port (23) is provided at the center of the end wall (36), and when the pressure oil is supplied, a pressing force acts on the piston (20), and this piston (20)
The thrust force is transmitted to the intermediate shaft (14) via a rolling bearing (25) such as a tapered roller bearing, which is arranged between the shaft end and the shaft end and can receive a thrust load. As a result, the intermediate gear A (9) and the intermediate gear B (10) fixed to the intermediate shaft (14) move in the axial direction, and the pinion (8) and the gear (11) meshing with them move the power circulation system. The rotating shafts (6, 7) are twisted to apply a torque load. The reason why the piston (20) is installed at both ends of the intermediate shaft is to change the thrust direction acting on the intermediate shaft end according to the rotation direction of the prime mover (3).
【0009】上記において、油室A(21)もしくは油
室(B)に供給される圧油は、油溜めから油圧ポンプ
(26)により吸い上げられ、その吐出側の油路(2
7)に設けられた調圧弁(28)及び比例電磁弁(2
9)により所定の圧力に調整されたのち電磁切換弁(3
0)に導かれる。また、原動機(3)の使用回転方向に
応じて選択的に電磁切換弁(30)のポートが切換えら
れ、油路(27)の圧油は油室A(21)又は油室B
(22)のいずれか一方に導かれる。In the above description, the pressure oil supplied to the oil chamber A (21) or the oil chamber (B) is sucked up by the hydraulic pump (26) from the oil sump, and the oil passage (2
7) pressure regulating valve (28) and proportional solenoid valve (2)
After being adjusted to a predetermined pressure by 9), the electromagnetic switching valve (3
0). Further, the port of the electromagnetic switching valve (30) is selectively switched according to the rotation direction of use of the prime mover (3), and the pressure oil in the oil passage (27) is changed to the oil chamber A (21) or the oil chamber B.
It is led to either one of (22).
【0010】一方、動力循環系の回転軸(6)にはトル
ク検出器(17)が設けられていて、この軸のねじれの
大きさを負荷トルクとして検出し、このトルク検出信号
(18)はトルク信号変換器(31)を経て比較演算器
(32)に与えられ、トルク設定器(図示せず)からの
トルク設定信号(34)と比較されその偏差に応じたト
ルク補正信号(33)が比例電磁弁(29)に送られ、
油室A(21)又は油室B(22)に供給される油圧力
が制御されるので、回転軸(6,7)に与えられる負荷
トルクは常に設定値に保持される。尚、この実施例で
は、中間軸にねじれ方向の異なる2個のハスバ歯車を用
いているが、これに替えてダブルヘリカルギヤを用いて
も良い。On the other hand, a torque detector (17) is provided on the rotary shaft (6) of the power circulation system, and the amount of twist of this shaft is detected as a load torque, and this torque detection signal (18) is obtained. A torque correction signal (33) corresponding to a deviation of the torque setting signal (34) from a torque setting device (not shown) is given to a comparison calculator (32) via a torque signal converter (31). Sent to the proportional solenoid valve (29),
Since the oil pressure supplied to the oil chamber A (21) or the oil chamber B (22) is controlled, the load torque applied to the rotating shafts (6, 7) is always held at the set value. In this embodiment, two helical gears having different twist directions are used for the intermediate shaft, but a double helical gear may be used instead.
【0011】[0011]
【発明の効果】以上のように、この発明によれば、中間
軸の軸方向移動量が比較的小さくて済むので油室のボリ
ュームが小さくなり、油圧ポンプ等の油圧機器容量が小
さくて済む。また、駆動軸と従動軸の両方にねじりを与
えることから負荷トルクを発生させるためのスラスト力
が小さくて済み、しかも軸径と同等のピストン径で大き
な受圧面積が得られるので、低油圧力で大きな負荷トル
クを付与することが可能になり油圧系統の保守が容易に
なるとともに、ころがり軸受を介してハスバ歯車にスラ
スト力を付与するためスラスト受部に発生する損失動力
が少なくなり、小容量の原動機で大負荷トルク運転を可
能にするという効果がある。更に、ピストンへの供給油
圧を常時一定に保持できるので安定した負荷トルクが得
られる。As described above, according to the present invention, the amount of axial movement of the intermediate shaft is relatively small, so that the volume of the oil chamber is small and the capacity of hydraulic equipment such as a hydraulic pump is small. Also, since both the drive shaft and the driven shaft are twisted, the thrust force for generating the load torque is small, and a large pressure receiving area can be obtained with a piston diameter equivalent to the shaft diameter, so low oil pressure is required. It is possible to apply a large load torque, which facilitates maintenance of the hydraulic system.Because thrust force is applied to the helical gears via the rolling bearings, the power loss generated in the thrust receiving part is reduced, and the small capacity This has the effect of enabling high load torque operation with the prime mover. Further, since the hydraulic pressure supplied to the piston can always be kept constant, a stable load torque can be obtained.
【図1】この発明の負荷発生用歯車変速機を備えた動力
循環式試験装置の全体系統図。FIG. 1 is an overall system diagram of a power circulation type test apparatus equipped with a load generating gear transmission of the present invention.
【図2】従来のトルク負荷装置の一例を示す断面図。FIG. 2 is a sectional view showing an example of a conventional torque load device.
1 負荷発生用歯車変速機 2 カップリング 3 原動機 4 ラジアル軸受メタル 5 循環歯車変速機 6,7 回転軸 8 ピニオン 9 中間ギヤA 10 中間ギヤB 11 ギヤ 12 供試歯車変速機 13 駆動軸 14 中間軸 15 従動軸 16 コイルスプリング 17 トルク検出器 18 トルク検出信号 19 カバー 20 ピストン 21 油室A 22 油室B 23 供給口 24 ピン 25 ころがり軸受 26 油圧ポンプ 27 油路 28 調圧弁 29 比例電磁弁 30 電磁切換弁 31 トルク信号変換器 32 比較演算器 33 トルク補正信号 34 トルク設定信号 35 ギヤボックス 36 端壁 1 Gear transmission for load generation 2 coupling 3 prime mover 4 Radial bearing metal 5 Circulation gear transmission 6,7 rotation axis 8 pinion 9 Intermediate gear A 10 Intermediate gear B 11 gears 12 Test gear transmission 13 Drive axis 14 Intermediate shaft 15 Driven shaft 16 coil spring 17 Torque detector 18 Torque detection signal 19 cover 20 pistons 21 Oil chamber A 22 Oil chamber B 23 Supply port 24 pin 25 Rolling bearing 26 hydraulic pump 27 oil passage 28 Regulator 29 Proportional solenoid valve 30 Solenoid switching valve 31 Torque signal converter 32 Comparison calculator 33 Torque correction signal 34 Torque setting signal 35 gearbox 36 End wall
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平1−227040(JP,A) 特開 昭55−160826(JP,A) 特開 昭54−58080(JP,A) 特開 昭63−236940(JP,A) 実開 平3−128836(JP,U) 実開 昭54−178548(JP,U) (58)調査した分野(Int.Cl.7,DB名) G01M 13/02 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-1-227040 (JP, A) JP-A 55-160826 (JP, A) JP-A 54-58080 (JP, A) JP-A 63- 236940 (JP, A) Actual development Flat 3-128836 (JP, U) Actual development Sho 54-178548 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) G01M 13/02
Claims (2)
機とを動力が循環するように接続すると共に、前記負荷
発生用歯車変速機にハスバ歯車を用い、この歯車を軸方
向に移動して動力循環系の軸にねじり変形を与えトルク
を負荷するようにした動力循環式試験装置において、ピ
ニオンを固着した駆動軸と、ギヤを固着した従動軸と、
前記ピニオン及びギヤとかみ合う、互いにねじれ方向の
異なる2個の中間ギヤを固着した中間軸とをそれぞれ平
行に配置し、前記中間軸をラジアル軸受メタルを介して
軸方向移動可能にギヤボックスに支持し、一端を開口し
た筒状のカバーにより前記中間軸の両端部を覆うと共
に、このカバーの他端内周にピストンを嵌合してピスト
ンとカバーとの間に油室を設け、この油室に圧油を供給
して前記ピストンを押圧し、ころがり軸受を介してピス
トン押圧力を前記中間軸軸端に伝達し、2個の中間ギヤ
を介して前記ピニオンとギヤの両方にトルクを負荷する
よう構成したことを特徴とする動力循環式試験装置の負
荷発生用歯車変速機。1. A circulation gear transmission and a load generating gear transmission are connected so as to circulate power, and a helical gear is used as the load generating gear transmission, and the gear is moved in the axial direction. In a power circulation type test apparatus in which a shaft of a power circulation system is torsionally deformed to apply a torque, a drive shaft to which a pinion is fixed, a driven shaft to which a gear is fixed,
The pinion and the gear are arranged in parallel with an intermediate shaft that is fixed to two intermediate gears having different twisting directions and meshed with each other, and the intermediate shaft is supported by a gear box via a radial bearing metal so as to be movable in the axial direction. While covering both ends of the intermediate shaft with a cylindrical cover having one end opened, a piston is fitted on the inner circumference of the other end of the cover to provide an oil chamber between the piston and the cover. Pressure oil is supplied to press the piston, the piston pressing force is transmitted to the intermediate shaft end via a rolling bearing, and torque is applied to both the pinion and the gear via two intermediate gears. A gear transmission for load generation of a power circulation type test apparatus characterized by being configured.
例電磁弁を経て電磁切換弁へ圧油を供給し、この電磁切
換弁により選択的に油室A又は油室Bの供給口に圧油を
導きピストンを押圧すると共に、動力循環系の回転軸に
トルク検出器を設け、トルク検出器からの検出信号をト
ルク設定信号と比較し、その偏差に応じたトルク補正信
号を比例電磁弁に与えてピストン押圧力を制御し、負荷
トルクを設定値に保持するよう構成した請求項1記載の
動力循環式試験装置の負荷発生用歯車変速機。2. Pressure oil is supplied from an oil sump to a solenoid switching valve via a pressure regulating valve and a proportional solenoid valve by a hydraulic pump, and this solenoid switching valve selectively feeds the pressure oil to the supply port of the oil chamber A or the oil chamber B. In addition to pushing the piston, a torque detector is installed on the rotating shaft of the power circulation system, the detection signal from the torque detector is compared with the torque setting signal, and the torque correction signal according to the deviation is given to the proportional solenoid valve. 2. The load generating gear transmission of the power circulation type test apparatus according to claim 1, wherein the piston pressing force is controlled by the lever to maintain the load torque at a set value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09402794A JP3525488B2 (en) | 1994-03-25 | 1994-03-25 | Gear transmission for load generation of power circulation type test equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09402794A JP3525488B2 (en) | 1994-03-25 | 1994-03-25 | Gear transmission for load generation of power circulation type test equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07260628A JPH07260628A (en) | 1995-10-13 |
JP3525488B2 true JP3525488B2 (en) | 2004-05-10 |
Family
ID=14099089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP09402794A Expired - Fee Related JP3525488B2 (en) | 1994-03-25 | 1994-03-25 | Gear transmission for load generation of power circulation type test equipment |
Country Status (1)
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JP (1) | JP3525488B2 (en) |
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-
1994
- 1994-03-25 JP JP09402794A patent/JP3525488B2/en not_active Expired - Fee Related
Cited By (2)
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CN108956133B (en) * | 2018-08-02 | 2021-03-30 | 清华大学 | Gear axial fatigue strength experiment load loading device |
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