12results about How to "Reduce axial force" patented technology

This application discloses an electronically controlled moving chainring mechanism, a shifting system, and a bicycle. The bottom bracket is installed in a cylinder body and is fixed circumferentially to the bushing. The piston is detachably connected to the bushing. When the pedal drives the bottom bracket to rotate, the bottom bracket drives the bushing to rotate, which in turn drives the chainring to rotate. When the freewheel shifts gears, the electronically controlled drive mechanism can actively drive the piston to move axially, and drive the bushing and chainring to adjust their positions synchronously, thereby reducing the angle between the chain, chainring, and freewheel, and improving riding efficiency. Furthermore, the reduced angle expands the meshing range between the chain and the teeth, reducing chain slippage, asymmetrical wear, and axial stress, lowering the risk of tooth deformation, and extending the service life of components. Compared to the traditional passive adjustment method of the chain driving the chainring, this embodiment actively controls the chainring movement through an electronically controlled drive mechanism, resulting in smoother and more precise chainring movement, avoiding jamming, and ensuring stable positioning after reaching the correct position, thus improving riding stability.

The utility model provides a rotor transmission structure and a screw compressor. The rotor comprises a male rotor arranged in an axial rotation mode and a plurality of female rotors arranged around the male rotor, the transmission structure comprises a driving gear, and the driving gear is installed on the shaft section of the male rotor; each driven gear is mounted on the shaft section of each female rotor, so that the plurality of driven gears are arranged around the driving gear and are meshed with the driving gear; and the inner gear ring is arranged around the driven gears and engaged with the driven gears. When the driven gear is meshed with the inner gear ring and the driving gear at the same time, the rotation stability of the driven gear is obviously improved. When the rotor rotates reversely, the reverse contact face of the driven gear can be connected with the inner gear ring or the driving gear more quickly, the response speed of the reverse contact face is earlier than that of tooth face contact generated by reverse movement of the rotor body, and therefore the tooth face collision fault caused by sudden change of the movement direction of the rotor is avoided.

The utility model provides a counterbalance, a motor rotor assembly and a compressor, the counterbalance comprises a counterbalance main body, the counterbalance main body extends along the circumferential direction of a motor rotor, the counterbalance main body is provided with a windward end and a leeward end, and at least the windward end is provided with a suspended flow guide body extending along the circumferential direction of the motor rotor. A suspended overflowing space is formed between the side, close to the first end face, of the suspended flow guiding body and the first end face, and the suspended flow guiding body is provided with a flow guiding radial outer side face and a flow guiding radial inner side face. The flow guide radial outer side face gradually gets close to the radial inner side of the motor rotor and / or the flow guide radial inner side face gradually gets close to the radial outer side of the motor rotor so that the cross section of the suspended flow guide body can become smaller and smaller in the circumferential direction away from the balance block body. According to the utility model, the internal flow field of the compressor is effectively prevented from being disturbed due to the pumping effect, the operation noise of the compressor is reduced, and meanwhile, the oil spitting rate and oil spitting quantity of exhaust refrigerant of the compressor are reduced.

This invention discloses a pressure-balanced composite sealing ball valve, comprising a valve body, a valve stem, a valve core, and a composite sealing structure. The valve body has a fluid channel and a first mounting hole, which communicates with the fluid channel. At least a portion of the valve stem is connected to the interior of the first mounting hole, and the valve stem can be driven to rotate. The valve core is disposed inside the valve body and is movably fitted with the valve stem. The valve stem has a balance hole, and the valve core has a guide hole, which communicates with the guide hole. The composite sealing structure is fitted around the outer circumference of the valve stem and is sealed to the inner wall of the first mounting hole. When the fluid channel is open, fluid enters the first mounting hole, contacts and forces the composite sealing structure to deform axially on the valve stem. This ball valve employs a composite sealing structure, ensuring a good seal between the valve stem and valve body even under high pressure, high-frequency operation, or the penetration of small molecule media. Simultaneously, the balance hole on the valve stem reduces the operating torque of the valve stem.

This invention relates to the field of testing equipment technology and provides an airtightness testing device, including an airtightness detector, an air intake assembly, and an elastic sealing plug. The air intake assembly includes a hollow air intake pipe and a support base. One end of the air intake pipe is fixedly connected to the support base, and the other end is provided with an external interface for connecting an external airtightness detector. The support base has a through-hole for connecting the air intake pipe and a cavity. The sealing plug includes an arcuate portion adapted to a narrow throat, a first limiting portion, and a second limiting portion. The sealing plug has a through-hole for the air intake pipe to pass through. The through-hole is located on the inner wall of the first limiting portion, which is recessed inward to form an abutment groove for restricting the movement of the support base. In this invention, the airtightness testing device has a simple structure, is quick to install and disassemble, ensures the reliability of liquid-fueled rocket engine quality, effectively improves the efficiency of liquid-fueled rocket assembly and testing, and shortens the preparation time before rocket launch.

This application discloses a direct-drive chainring mechanism and a bicycle. By placing a linear motor between the frame and the bottom bracket, and fitting the motor rotor onto the bottom bracket to allow it to move axially along the bottom bracket, and connecting a bushing fitted onto the bottom bracket to the motor rotor, the chainring can be moved synchronously along the bottom bracket axially by controlling the working state of the motor stator. This adjusts the angle between the chainring and the chain, reducing the deviation of the angle from the ideal zero degree, decreasing the axial component force generated by the angle when the chain transmits driving force, increasing the effective power to drive the freewheel, and ultimately improving riding efficiency. This embodiment of the application provides a reliable path for optimizing the power transmission efficiency of a multi-speed bicycle by utilizing the linkage mechanism between the linear motor and the chainring. Furthermore, because the angle is smaller, the meshing range between the chain and the teeth is wider, reducing chain slippage, asymmetrical wear of the teeth, and axial force on the teeth.

The invention discloses an air compressor and an axial force adjusting method thereof, a fuel cell system and a vehicle, the air compressor comprises a machine body, a pressurization mechanism and a sealing mechanism, the sealing mechanism comprises a first sealing assembly and a second sealing assembly which are both installed on a rotating shaft, the first sealing assembly is connected with the side, close to a second impeller, of a first impeller, and the second sealing assembly is connected with a second impeller. A first sealing channel communicating with the first volute is arranged between the first sealing assembly and the first impeller. The second sealing assembly is connected with the side, close to the first impeller, of the second impeller, and a second sealing channel communicating with the second volute is arranged between the second sealing assembly and the first impeller. The second sealing assembly is provided with a bypass sealing channel communicating with the second sealing channel and an adjusting assembly used for adjusting the opening degree of a communicating opening between the bypass sealing channel and the second sealing channel. The opening degree of the communicating opening is adjusted through the adjusting assembly, axial force balance of the air compressor within the full rotating speed range is achieved, and the safety performance and efficiency of the thrust bearing are improved.

This utility model discloses a high-pressure water braid for coal mine drilling, comprising a fixed body, a rotating body, and bearings arranged coaxially. The fixed body includes a protective shell, an end cap, a high-pressure seal, an O-ring, and a lubricator. The top of the protective shell is fixed to the end cap by threads, and a high-pressure seal is provided at the bottom of the protective shell. The O-ring is installed inside the end cap, and the lubricator is installed on the end cap. The rotating body includes an inner shaft and a bearing support pad. The bearings include rolling bearings and flat bearings. The inner shaft is located inside the protective shell and extends through the end cap. The middle part of the inner shaft is installed to the protective shell through rolling bearings and flat bearings. It adopts a split design, and the fixed body and the rotating body are connected by bearings. This allows the fixed body and the rotating body to rotate relative to each other while slightly moving relative to each other in the axial direction of the inner shaft, thereby compressing the internal oil injection cavity and generating reverse pressure, thus reducing the axial force on the bearing and achieving flexible rotation under high pressure conditions.

The application relates to an oscillating pulse screw drill tool with improved shaft stress, which comprises a drill tool body, a static valve assembly and a dynamic valve assembly. The drill tool body comprises a shell and a shaft, the shell is a hollow tubular structure, and the shaft is located in the shell and can rotate in the shell. The static valve assembly comprises a static valve shell coaxially connected with the shell, and a static valve flow channel is arranged in the static valve shell. The dynamic valve assembly is axially gap-connected with the static valve assembly, and comprises a dynamic valve seat fixed on the top of the shaft, and a dynamic valve flow channel is arranged in the dynamic valve seat. The dynamic valve assembly rotates eccentrically relative to the static valve assembly to periodically change the flow area between the static valve flow channel and the dynamic valve flow channel. The dynamic valve assembly of the application is gap-connected with the static valve assembly, the static valve assembly directly transmits the axial force borne by the static valve assembly to the static valve shell, and does not directly transmit the axial force to the dynamic valve assembly. Therefore, the shaft can bear additional axial force, rotating friction resistance and bending moment, the service life of the shaft and the bearing system of the screw drill tool is prolonged, and the efficiency of the whole screw drill tool is improved.

This utility model relates to the field of thread tapping tooling technology, specifically to a thread tapping tooling, including a taper shank and a tapping assembly. The taper shank has a connecting part, and the tapping assembly has a guide groove. The connecting part is embedded in the groove, driving the tapping assembly to rotate radially and allowing relative sliding in the axial direction to absorb part of the axial load. The tapping assembly includes a sliding sleeve and an assembly part. The sliding sleeve has a guide hole and a positioning platform. The assembly part can slide into and fix the tap. The mounting hole communicates with the guide hole. The end of the taper shank has a clearance hole to avoid the tail of the tap. The taper shank has a scale strip to facilitate observation of displacement changes through the guide groove, realizing quantitative control of the tapping depth. This utility model can effectively reduce the axial force transmitted to the tap, avoid tooth damage, and improve tapping stability and thread forming quality.

The utility model belongs to the technology of tobacco primary processing equipment, and discloses a carrier roller and an electronic scale, the carrier roller comprises a support shaft and a hollow shaft sleeved on the support shaft through a bearing, and further comprises a bearing blocking piece, a sealing piece and a positioning piece. First step grooves are formed in the two ends of the hollow shaft, and the bearings are limited in the first step grooves through the bearing blocking pieces. The sealing piece is arranged on the outer side of the bearing blocking piece in the axial direction of the supporting shaft. The positioning piece is arranged on the outer side of the sealing piece in the axial direction of the supporting shaft and detachably connected with the supporting shaft. The sealing piece comprises a limiting part and a sealing part which are arranged at an included angle, the limiting part is located between the positioning piece and the bearing blocking piece, and the supporting shaft is sleeved with the sealing part. According to the carrier roller, the bearing is limited in the first step groove in the hollow shaft through the bearing blocking piece, the axial freedom degree of the bearing is limited, the sealing piece is limited between the positioning piece and the bearing blocking piece through the positioning piece, lubricating oil in the bearing is sealed around the bearing, dust is prevented from entering a working area of the bearing, and the service life of the carrier roller is prolonged. Good operation of the bearing is ensured.

The utility model relates to a shield pump capable of realizing rotor axial force self-balancing, which comprises a motor shell, and a motor front end cover and a motor rear end cover which are respectively arranged at two ends of the motor shell, a shielding sleeve is arranged in the motor shell, a stator is arranged between the shielding sleeve and the motor shell, a main rotating shaft is arranged in the shielding sleeve, and a rotor is arranged in the main rotating shaft. The main rotating shaft is provided with a rotor, and the motor front end cover and the motor rear end cover are both provided with sliding thrust bearings assembled with the main rotating shaft. A shielding sleeve inner cavity is formed in the main rotating shaft, a bearing runner is arranged in the sliding thrust bearing, a center hole runner is arranged in the main rotating shaft in the axial direction, a runner water outlet is formed in the main rotating shaft, and the bearing runner, the shielding sleeve inner cavity, the bearing runner, the center hole runner and the runner water outlet form an inner circulation runner. The shield pump has the effect of prolonging the service life of the shield pump.