Transmission testing device

Abstract

Provision of an intermediate shaft and a torque meter between a test product and a dynamometer in a transmission testing device in which the test product is set in an environmental chamber leads to a long axial length and thereby requires a large floor area for setting, and also causes a twisting of a shaft and leads to a poor rigidity. A hollow spacer is provided between a face plate of the environmental chamber and a test product attachment holder to which the test product is attached. A flange with an H-shape in side view is disposed in the hollow of the spacer. The flange has an end connected to an adaptor flange fixed to the test product, and another end connected to a rotating shaft of the dynamometer via the torque meter.

The invention claimed is: 
     
       1. A transmission testing device for testing a test product at a temperature inside of an environmental chamber, wherein the test product is set in the environmental chamber and connected to an input shaft dynamometer through a torque meter arranged out of the environmental chamber, wherein:
 the test product is arranged to face a hole formed in a face plate, and is fixed to the face plate, and is attached to a test product attachment holder through the face plate, wherein the test product attachment holder is disposed outside of the environmental chamber; 
 the test product attachment holder includes an opened side surface, and a second side surface opposite to the opened side surface, wherein the second side surface is formed with a hole having, such that the test product attachment holder is formed to have a box-shape; 
 attachment of the test product to the test product attachment holder is implemented by fixing the face plate under a condition where the hole of the face plate and the hole of the test product attachment holder face each other, and arranging a flange in a hollow formed in the test product attachment holder for connection between the test product and the input shaft dynamometer, and connecting a first end of the flange to an adapter flange of the test product, and connecting a second end of the flange to a rotating shaft of the input shaft dynamometer through the torque meter; and 
 a thermal insulation wall is provided at a test-product-fixing-side inner wall of the test product attachment holder, for suppressing thermal conduction from the environmental chamber. 
 
     
     
       2. The transmission testing device as claimed in  claim 1 , wherein the flange is provided with a thermal radiation flange at a shaft thereof, for preventing conduction of cold atmosphere and hot atmosphere from the environmental chamber to the torque meter through the flange. 
     
     
       3. The transmission testing device as claimed in  claim 1 , wherein:
 the thermal insulation wall is composed of separate parts; and 
 the hole of the test product attachment holder is covered by an insulation plate after coupling between the test product and the flange. 
 
     
     
       4. The transmission testing device as claimed in  claim 1 , wherein the hollow of the test product attachment holder is connected to an air duct such that air is sent into the hollow through the air duct. 
     
     
       5. A transmission testing device for testing a test product at a temperature inside of an environmental chamber, wherein the test product is set in the environmental chamber and connected to an input shaft dynamometer through a torque meter arranged out of the environmental chamber, wherein:
 the test product is arranged to face a hole formed in a face plate, and is fixed to the face plate; 
 a test product attachment holder is disposed outside of the environmental chamber, and is formed with a hole in a position facing a position of the test product, wherein the hole of test product attachment holder faces the hole of the face plate; 
 a hollow spacer is disposed between the hole of the test product face plate and the hole of the test product attachment holder, wherein the test product is attached to the test product attachment holder through the face plate; and 
 a flange is located in a hollow of the spacer, having an H-shape in side view, wherein the flange has a first end connected to an adapter flange fixed to the test product, and a second end connected to a rotating shaft of the input shaft dynamometer through the torque meter. 
 
     
     
       6. The transmission testing device as claimed in  claim 5 , further comprising a thermal insulation wall in the hollow of the spacer, for preventing conduction of cold atmosphere and hot atmosphere from the environmental chamber to the torque meter. 
     
     
       7. The transmission testing device as claimed in  claim 5 , further comprising:
 a constant temperature chamber provided in the hollow of the spacer between the thermal insulation wall and the torque meter; and 
 a temperature sensor disposed in the constant temperature chamber; 
 wherein temperature of the constant temperature chamber is controlled based on a sensing signal from the temperature sensor. 
 
     
     
       8. The transmission testing device as claimed in  claim 5 , wherein the flange is provided with a thermal radiation flange at a shaft thereof, for preventing conduction of cold atmosphere and hot atmosphere from the environmental chamber to the torque meter through the flange. 
     
     
       9. The transmission testing device as claimed in  claim 6 , wherein:
 the thermal insulation wall is composed of separate parts; and 
 the hole of the test product attachment holder is covered by an insulation plate after coupling between the test product and the flange. 
 
     
     
       10. The transmission testing device as claimed in  claim 2 , wherein the hollow of the test product attachment holder is connected to an air duct such that air is sent into the hollow through the air duct. 
     
     
       11. The transmission testing device as claimed in  claim 6 , further comprising:
 a constant temperature chamber provided in the hollow of the spacer between the thermal insulation wall and the torque meter; and 
 a temperature sensor disposed in the constant temperature chamber; 
 wherein temperature of the constant temperature chamber is controlled based on a sensing signal from the temperature sensor. 
 
     
     
       12. The transmission testing device as claimed in  claim 6 , wherein the flange is provided with a thermal radiation flange at a shaft thereof, for preventing conduction of cold atmosphere and hot atmosphere from the environmental chamber to the torque meter through the flange.