A gear measurement method and a gear measurement apparatus capable of evaluating meshing and fitting of a gear are provided. A measurement method for a gear includes a measurement step of measuring an actual movement locus of a ball that is moved along a tooth groove of the gear as a shape evaluation index for the gear. In the case of a VGR rack, tooth surfaces of rack teeth are constituted of curved surfaces. Thus, a reference pin for use in OPD cannot be disposed so as to be in line contact with the tooth surfaces, and the rack teeth cannot be measured. However, the ball can be disposed so as to be in point contact with the tooth surfaces, which enables a measurement of the rack teeth.

An apparatus for inspecting and/or measuring a gear wheel workpiece, which comprises: a first workpiece spindle for fastening and rotationally driving the gear wheel workpiece, a rotational drive for rotationally driving the gear wheel workpiece when it is fastened on the first workpiece spindle, measuring means for inspecting and/or measuring the gear wheel workpiece when it is fastened on the first workpiece spindle,
wherein the rotational drive is designed to rotationally drive the gear wheel workpiece including the first workpiece spindle during a measurement and/or inspection phase, while the measuring means is used for inspecting and/or measuring the gear wheel workpiece, rotationally drive the gear wheel workpiece including the workpiece spindle during a spinning phase to spin off a liquid.

A backlash measuring method is provided for measuring backlash at a plurality of different times. The backlash measuring method includes: a rotation amount calculating step of braking a ring gear relative to a second portion while contact between a target tooth and the ring gear achieved in a contacting step is maintained, causing a target pinion to rotate toward a second side in a rotation direction opposite to the first side with a driving force less than a braking force applied to brake the ring gear relative to the second portion until the target tooth touches the ring gear at a tooth surface facing the second side, and calculating an amount of rotation of the target pinion; and a measuring step of measuring backlash between the ring gear and the target pinion based on the amount of rotation of the target pinion calculated in the rotation amount calculating step.

An apparatus for inspecting and/or measuring a gear wheel workpiece, which comprises: a first workpiece spindle for fastening and rotationally driving the gear wheel workpiece, a rotational drive for rotationally driving the gear wheel workpiece when it is fastened on the first workpiece spindle, measuring means for inspecting and/or measuring the gear wheel workpiece when it is fastened on the first workpiece spindle, wherein the rotational drive is designed to rotationally drive the gear wheel workpiece including the first workpiece spindle during a measurement and/or inspection phase, while the measuring means is used for inspecting and/or measuring the gear wheel workpiece, rotationally drive the gear wheel workpiece including the workpiece spindle during a spinning phase to spin off a liquid.

A method of preparing a machining process of a toothed workpiece rotatably drivable around its rotation axis, the machining process to be executed by a tool rotatably drivable around its rotation axis, wherein, for establishing a synchronized matching engagement of the tool with the workpiece toothing, a contact with the workpiece can be or is generated by performing a movement via a positioning axis, and, by means of a surveillance of a movement dedicated to an axis of motion, a contact to the workpiece is used for establishing information about a relative rotary position of the workpiece, whereby the contact is made by a portion of the tool and the dedicated axis of motion is an axis capable to move or rotate the workpiece or the tool but which is not the positioning axis.

Disclosed herein is a multilayer solar module installation structure. The multilayer solar module installation structure includes: a pair of frames which are spaced apart from each other, and in which guide grooves are formed through the opposite side surfaces thereof in longitudinal directions; and solar modules which are installed on upper and lower sides between the frames so that they are movable along the guide grooves, and which convert the solar energy of incident solar light into electric energy. Through this configuration, the solar modules are disposed on the upper and lower sides of the frames, thereby achieving the effect of efficiently using a solar light installation space.

A method of preparing a machining process of a toothed workpiece rotatably drivable around its rotation axis, the machining process to be executed by a tool rotatably drivable around its rotation axis, wherein, for establishing a synchronized matching engagement of the tool with the workpiece toothing, a contact with the workpiece can be or is generated by performing a movement via a positioning axis, and, by means of a surveillance of a movement dedicated to an axis of motion, a contact to the workpiece is used for establishing information about a relative rotary position of the workpiece, whereby the contact is made by a portion of the tool and the dedicated axis of motion is an axis capable to move or rotate the workpiece or the tool but which is not the positioning axis.

A gear measurement method and a gear measurement apparatus capable of evaluating meshing and fitting of a gear are provided. A measurement method for a gear includes a measurement step of measuring an actual movement locus of a ball that is moved along a tooth groove of the gear as a shape evaluation index for the gear. In the case of a VGR rack, tooth surfaces of rack teeth are constituted of curved surfaces. Thus, a reference pin for use in OPD cannot be disposed so as to be in line contact with the tooth surfaces, and the rack teeth cannot be measured. However, the ball can be disposed so as to be in point contact with the tooth surfaces, which enables a measurement of the rack teeth.

A roll testing machine for roll testing toothings includes a first spindle and a second spindle, and a first master wheel, which is arranged on the first spindle. The roll testing machine allows for a more efficient testing of a shaft having two gearings by using a second master wheel, which is arranged on the first spindle.

The invention discloses a method for measuring and evaluating gear precision. The method includes steps of scanning a tested gear and building up an actual model of the tested gear via scanned data; overlapping the actual model of the tested gear with a standard 3D model; selecting a section of the overlapped model to compare; judging if the point on the actual model section exceeds a tolerance zone selected on the actual model. The method makes the measurement data of the gear direct, visible, simple and easily-understood, and needs not too professional technological background; the method needs not professional measuring device of the gear so that the investment to professional instruments can be reduced; the data information is comprehensive, and every data characteristic of the gear face can be completely controlled; the tested data can be directly read to design or use in analysis software; the efficiency is high and the method can be used for online measurement of gear spare parts in volume production, thus the product quality is easy to manage; moreover, the method can be applicable to the data systematic management of the gear product, tracking and analysis of complex data.