Mazda Motor Corporation

Ryobi Limited

Yutaka Fujii

Tatsumi Makimae

Hiroshi Shinagawa

Tetsuyuki Doi

Takahiko Shinmoto

Hideki Doumoto

Yuji Narukawa

A bolt is fastened up to a predetermined snug torque Ts and then the bolt is further fastened by a specified angle &#x3b8;t from a bolt angle corresponding to the snug torque Ts. Herein, in order to obtain excess and deficiency of the fastening angle up to the snug torque Ts, an angle-variation difference between the fastening angle &#x3b8;sb of the bolt at the point where the fastening torque of the bolt has reached the snug torque Ts and a standard angle &#x3b8;sa of the snug torque Ts is calculated. And, addition of this angle-variation difference to a base angle is set as the new specified angle &#x3b8;t to correct the excess and deficiency. Accordingly, variation in a fastening shaft force can be restrained even if the snug torque is set at a relatively high torque in the bolt fastening method using the torque+angle method.

Bolt fastening method and apparatus

A bearing cap, a type of thread-clamped member, is clamped to a cylinder block by flanged hexagonal bolts. The material of the bearing cap is aluminum alloy, while the material of the bolts is steel. The bearing cap has a raised seat the end surface of which provides a bearing surface. The bearing surface of the raised seat has a smaller diameter than the bearing surface of each bolt.

Method for tightening a threaded fastener to clamp a thread-clamped member

After it is tightened with a snug torque T, a bolt is tuned by a total turning angle &#x3b8;equivalent to the sum of an initial-set turning angle &#x3b8;and a corrective additional-turning angle (&#x3b8;+&#x3b8;). The corrective additional-turning angle (&#x3b8;+&#x3b8;) is the sum of a first corrective additional-turning angle &#x3b8;and a second corrective additional-turning angle &#x3b8;, the first corrective additional-turning angle &#x3b8;being to compensate for a situation where a bolt turning angle &#x3b8;corresponding to the snug torque &#x3b8;on an extension line of the bolt tightening torque properties Cin a late tightening stage II is different from a bolt turning angle &#x3b8;corresponding to the actual snug torque T, the second corrective additional-turning angle &#x3b8;being to compensate for a decrease of an effective bolt axial force that is caused by an existence of the initial tightening stage I.

Bolt tightening method and bolt tightening apparatus

According to a bolt tightening method and a bolt tightening apparatus of the invention, a bolt is tightened by using a bolt tightening device, in which torque gradients expressed in terms of the ratio of a tightening torque exerted on the bolt to its turning angle are calculated by successively detecting the tightening torque at intervals of a specific bolt turning angle and calculating an average of individual torque gradient values by first and second torque gradient calculators, and the amount of tightening of the bolt is controlled by a tightening amount controller based on the average of the individual torque gradient values calculated.

Method and apparatus for tightening bolts

A sheet-fed printing press includes a printing section for printing on sheets of paper, a sheet discharge section for discharging sheets of paper printed at the printing section from the printing section, a see-through part provided on the upper side of the sheet discharge section so that the inside of the sheet discharge section can be visually observed therethrough, and a color check table, on which a printed sheet of paper picked up from the sheet discharge section is placed for color checking thereof The color check table is located so as to at least partially cover the see-through part from above. The color check table is designed to be movable in a sheet transfer direction so that an area of the see-through part exposed to the outside on the downstream side of the color check table is increased as the color check table is moved towards an upstream side of the sheet transfer direction.

Sheet-fed printing press

A vehicle speed control system for a vehicle is used, with a vehicle navigation system, for indicating a location of the vehicle on a road map as the vehicle travels and for providing information related to the road, including curves of the road. The vehicle speed control system receives information related to curves of a road on which the vehicle travels, such as the radius of curvature, when the vehicle navigation system indicates that the vehicle location is before the curve. The system calculates a limit vehicle speed, at which the vehicle can negotiate and pass safely through the curve, based on the vehicle speed and the radius of curvature of the curve. When the vehicle speed is higher than the limit vehicle speed, the vehicle speed control system provides a warning and/or automatically brakes the vehicle, or automatically closes a throttle of the vehicle, so as to lower cause the vehicle speed to fall below the limit vehicle speed.

Vehicle speed control system

Offset printing machine

A sheet-fed press includes a front guide device which performs a positional adjustment of a printing sheet before transferring it to a transfer drum. In order to adjust an image forming portion on the printing sheet, both ends of a front guide rod are moved independently of each other. Moving distances of the both ends of the rod are computed by a central processing unit on the basis of a paper size, etc.

Front guide position adjusting device in a sheet-fed press

A lateral perforation vertical registration device for an offset press in which the position of lateral perforations formed on printing sheets can be accurately set without the need for running a number of test sheets. A lateral perforating position reading plate is provided made of a transparent material and having both lateral and vertical scales. A printing sheet is placed on the perforating position reading plate prior to printing to determine the position of lateral perforating. A vertical scale provided on the outer peripheral surface of a numbering device mounting cylinder is then adjusted relative to a fixed pointer to correspond to the value read on the reading plate.

Growing community of inventors

Hiroshima, Japan

Yutaka Fujii