摘要:
An actuator arranged to be movable between an extended condition and a compressed condition and being biased to an intermediate condition between and distinct from the extended condition and the compressed condition. The actuator includes a damping device arranged to define the damping coefficient of the actuator. The damping device is arranged to provide a relatively low damping coefficient when the actuator is in a first condition distinct from the intermediate condition, and a relatively high damping coefficient when the actuator is in a second condition, the second condition being distinct from the first condition and being equal or adjacent to the intermediate condition
摘要:
The invention relates to a compressed-air device for controlling valves comprising, in a longitudinal direction, a first vane-type rotary cylinder (1) having a front face (2) as well as a back face (4), said front face (2) being provided with a rotatable head (3), and a second vane-type rotary cylinder (10) having a front face (11) and a back face, said first (1) and second (10) cylinders each being supplied with compressed air by means of a compressed air valve connected to two ports (7, 8; 14, 15) on each of said first and second cylinders.
摘要:
An actuator arranged to be movable between an extended condition and a compressed condition and being biased to an intermediate condition between and distinct from the extended condition and the compressed condition. The actuator includes a damping device arranged to define the damping coefficient of the actuator. The damping device is arranged to provide a relatively low damping coefficient when the actuator is in a first condition distinct from the intermediate condition, and a relatively high damping coefficient when the actuator is in a second condition, the second condition being distinct from the first condition and being equal or adjacent to the intermediate condition
摘要:
The present invention provides a three position hydraulic piston assembly for a gear ratio change mechanism for a transmission exhibiting reduced gear shift noise. The three position hydraulic piston assembly includes a master piston and motion retarding assemblies that act near both travel limits of the master piston. The master piston includes symmetrical passageways that provide hydraulic fluid flow to small chambers at each end of the piston that are closed off as the piston approaches its travel limits. Hydraulic fluid trapped in the chambers decelerates the piston and is bled off through an orifice allowing the piston to reach its travel limit and quickly and quietly engage a gear ratio.
摘要:
An oleopneumatic actuator cylinder device for steering and self-centering for the alignment to a straight drive of steering or self-steering axles, in particular for rear axles of vehicles, is constituted by a single oleopneumatic actuator cylinder for each rear steering axles. The actuator cylinder comprises a pneumatic sector communicating with a respective pneumatic circuit, an oleodynamic sector communicating with a respective oleodynamic circuit, a stem kinetically connected to the a mechanical driving element to move the wheels of the vehicle, and a central body that delimits the pneumatic sector and the oleodynamic sector.
摘要:
A pusher which has a stroke shorter than that of a piston at either position on a head side or a rod side in a cylinder main body and which serves as both means for pushing the piston from a stroke end back to an intermediate stopping position and means for stopping the piston at the intermediate stopping position is disposed so as to be movable independently from the piston, and pressing means for causing the pusher to displace to the intermediate stopping position is provided.
摘要:
A multi-position control cylinder for hot runners of injection molding machines is disclosed. This multi-position control cylinder has a multi-stage hole formed in a unit body, a first cylinder seated in the lower part of the multi-stage hole, and a first piston set in the first cylinder. In addition, a second cylinder is seated in the multi-stage hole at a position above the first cylinder, with a second piston set in the second cylinder. A valve pin is coupled to the second piston using a valve pin coupling member such that the valve pin extends downward from the second piston while passing through the first piston, with the lower portion of the valve pin inserted into the upper portion of the first piston. An anti-vacuum gap is formed between the first piston and the valve pin coupling member. A cylinder head covers the top of the multi-stage hole at a position above the second piston. This multi-position control cylinder has a simple construction, accomplishes a reliable operation, and easily increases the number of cylinders seated in the multi-stage hole by seating a desired number of additional cylinders with pistons in the multi-stage hole.
摘要:
A piston 14 for sliding in a cylinder 12, a rod 16 of the piston 14, and a sleeve 15 fitted over the rod 16 and passing through a rod hole 13 of the cylinder are provided. A lock portion 18 is provided to an outer periphery of a tip end portion of the rod 16. The sleeve 15 having an outer peripheral face for airtightly sliding in the rod hole 13 in the cylinder 12 and an inner peripheral face for airtightly sliding on an outer peripheral face of the rod 16 is provided with an engaging portion 22 on an inner end side to be engaged with an inside of the rod hole 13 of the cylinder and an engaging portion 23 at an outer end side to be engaged with the lock portion 18 of the rod 16. Supply/discharge ports 18A and 19A for supplying and discharging pressure fluid to and from pressure chambers 18 and 19 on opposite sides of the piston 14 in the cylinder are provided and intermediate stop is possible by supplying and discharging pressure fluid to and from the ports.
摘要:
A three-position hydraulic actuator comprising an outer body defining a cylindrical inner cavity; a dual-rod piston sliding inside the cavity; a pair of stop rings mounted in respective central annular seats in the lateral wall of the cavity and on the piston; and a pair of bushes sliding in sealed manner between the piston and the lateral wall of the cavity and located on axially opposite sides in relation to the stop rings.
摘要:
A hydraulic cylinder that is capable of being set in three positions utilizing a movable cylinder with a fixed main piston and auxiliary pistons slidably mounted within the cylinder. Right and left fluid chambers are defined, within the cylinder, by the main piston and right and left auxiliary pistons respectively.