5013 results about "Sprocket" patented technology

The invention discloses road and bridge construction concrete detection equipment, and relates to the field of concrete detection.The road and bridge construction concrete detection equipment comprises a sample seat and a movable pressing plate, vertical plates are fixed to the two sides of the upper surface of the sample seat, top plates are fixed to the top ends of the two vertical plates, and a limiting groove used for placing a concrete block is formed in the center of the upper surface of the sample seat; the pressing plate is located above the limiting groove, a groove is formed in the center of the upper surface of the pressing plate, a liquid storage cylinder is fixed in the groove, and liquid penetrating holes are formed in the positions, located in the groove, of the lower surface of the pressing plate and the bottom end of the liquid storage cylinder; a pressure applying assembly and two transmission assemblies are arranged above the liquid storage cylinder, the two transmission assemblies are symmetrically arranged on the pressure applying assembly, and inner chain wheel teeth are arranged on spokes corresponding to the two rope winding rollers respectively. And the stress environment of the road and bridge concrete in real service is restored, and the comprehensiveness and reliability of detection data are improved.

The invention discloses a mining chain wheel repaired based on an intelligent optical tracking technology and a technology. The repairing technology comprises the following steps that S1, an optical scanning device is used for scanning a worn chain wheel, surface point cloud data of the chain wheel are obtained, and an actual three-dimensional model of the chain wheel to be repaired is generated according to the point cloud data; s2, Boolean operation is carried out on the actual three-dimensional model generated in the step S1 and a preset chain wheel standard digital model, so that a relative wear model only representing a chain nest wear area is extracted; s3, based on the relative wear model, automatically generating a robot welding path for filling a wear area, and generating a repair program; and S4, the welding robot is controlled to execute the repairing program generated in the step S3, and self-adaptive surfacing repairing is conducted on the abrasion area of the chain nest. According to the method, through a digital closed loop of accurate scanning, model comparison, automatic programming and robot repairing, accurate repairing of irregular abrasion of each chain nest is achieved, the repairing quality is improved, and the maintenance period is shortened.

The invention discloses a refrigeration pipe welding positioning method and device. The method comprises the following steps that S1, branch pipes are placed in all storage boxes; s2, the main pipeline is placed in a matching groove of the supporting frame, and the main pipeline is fixed through cooperation with a pressing ring; s3, a third electric cylinder is started, the third electric cylinder drives a supporting frame and the main pipeline to move to be close to the welding gun, and a branch pipe of the main pipeline moves to cross the welding gun; s4, a first electric cylinder is started, and the first electric cylinder drives a synchronous plate and an ejector sleeve to move; the motor, the first chain wheel, the second chain wheel, the chain and the hollow rotating disc are matched to drive the vortex line groove and linear groove linkage adjusting block and the rolling wheel to move, the purposes of clamping positioning and circle center correction of the branch pipe are achieved, the branch pipe is corrected to the position concentric with the disc, the coaxiality of the branch pipe and a main pipeline branch pipe is guaranteed, and the machining efficiency is improved. And the quality problems of insufficient welding, welding skips, poor welding seam forming and the like caused by positioning deviation are avoided.

The invention discloses a system for lowering and recovering a hydraulic pipe of an underwater blowout preventer, which comprises a winch drum, a driving assembly and a bearing seat are respectively arranged on shafts at two ends of the winch drum, the driving assembly is used for driving the winch drum to rotate, and the bearing seat is used for supporting the winch drum; a replaceable chain wheel and a hydraulic slip ring are sequentially mounted on the projecting shaft on the other side of the bearing seat, and the replaceable chain wheel is connected with a cable arrangement device through a chain; a hydraulic pipe of the underwater blowout preventer is led into the winch roller through the hydraulic sliding ring, then led to the cable arrangement device through the winch roller and finally led to the underwater blowout preventer through the cable arrangement device, and the cable arrangement device is used for enabling the hydraulic pipe to be arranged in order along the winch roller. The driving assembly is connected with a pneumatic control system which is used for controlling the driving assembly to drive the winch drum. According to the system, hydraulic pipes with different diameters can be automatically collected and released, the heat dissipation effect is good in the collecting and releasing process, and serious heating of the hydraulic pipes cannot be caused.

The utility model discloses plant extract extraction equipment, which belongs to the technical field of plant extraction and comprises an extraction barrel, a supporting plate is fixedly mounted on the upper surface of the extraction barrel, a fixing plate is fixedly mounted on the upper surface of the supporting plate, and a pressing component and a lifting component are arranged on the upper surface of the fixing plate; according to the device, the pressing assembly is arranged, the other toothed chain wheel drives the reciprocating lead screw to rotate under the action of the toothed chain, at the moment, the lower sliding sleeve can drive the pressing plate to move up and down in the filter barrel under the limitation of the air cylinder under the action of the thread, plants in the filter barrel can be extruded when the pressing plate moves downwards, and when the pressing plate moves upwards, the plants can be extruded by the reciprocating lead screw. When the plant is not extruded, the solvent can be absorbed, so that the plant is filled with the solvent, the plant is pressed while rotating in the plant soaking process, the full contact between the plant and the solvent is further ensured, the extraction quality of plant extraction is improved, the solvent waste can be avoided by pressing during discharging, and the purpose of saving resources is achieved.

The utility model relates to a safe operation protection system of a non-metal mud scraper and a mud scraping system. The safe operation protection system of the non-metal mud scraper comprises a scraper detection device, a tension early warning device and an electrical control system, the scraper blade detection device comprises at least one group of scraper blade detection devices, each group of scraper blade detection devices comprises two scraper blade detection devices which are oppositely arranged, each scraper blade detection device is connected with the electrical control system, and the scraper blade detection devices are used for being in contact with the two side ends of a scraper blade; the tensioning force early warning device comprises two opposite tensioning force early warning devices, each tensioning force early warning device is connected with the electric appliance control system, and the tensioning force early warning devices are used for making contact with the first chain wheel. The system can timely identify the faults such as asynchronous deviation and chain breakage of the two sides of the scraper.

The invention discloses an intelligent control anchor chain winding and unwinding system, and relates to the technical field of marine equipment, the intelligent control anchor chain winding and unwinding system comprises an anchor chain winding and unwinding mechanism, the anchor chain winding and unwinding mechanism is provided with an anti-inversion mechanism, the anti-inversion mechanism comprises a ring block with a hole, a rotating rod, a long rod, an electric cylinder and a gear ring, and the inner part of the ring block with the hole is rotatably connected with an inner ratchet wheel; a gear ring is fixed in the annular groove, the outer surface of the rotating rod is fixedly sleeved with a gear, a limiting block is fixed to the rotating disc, a clamping block is additionally installed at the telescopic end of the electric cylinder, a round rod is fixed to the surface of the rotating disc, and a pawl is rotationally connected to the outer surface of the round rod. According to the anchor chain braking device, the anchor chain can be braked in time when the power for driving the anchor chain chain wheel fails, so that the situation that the released length exceeds the safety range due to the fact that the anchor chain which is being withdrawn continuously slides down is avoided, the safety of a ship in the traveling process is improved, and meanwhile the service life of the anchor chain is prolonged.

The invention belongs to the technical field of metal pipe continuous bending, and particularly relates to a metal pipe continuous bending device which comprises a rack, two sets of transmission shafts are symmetrically and rotationally installed in the rack, two sets of chain wheels are symmetrically installed on the transmission shafts, the two sets of chain wheels are meshed with two sets of chains correspondingly, and a plurality of sets of pressing modules are arranged between the two sets of chains in a surrounding mode. A plurality of sets of press-fit modules are arranged on the rack, placing grooves and bending grooves are formed in the press-fit modules and communicate with each other, a bending mechanism is arranged on the rack, the press-fit modules are driven to do circular motion, each set of press-fit module can sequentially pass through a feeding point and the bending mechanism, in the metal pipe bending process, a worker can conduct feeding and discharging at the same time, and the working efficiency is improved. And the feeding and discharging time is saved, so that the metal pipe can be continuously bent, and the bending efficiency of the metal pipe is improved.

The invention provides a chain wheel type movable chassis and a method, and belongs to the technical field of road and bridge construction, the chain wheel type movable chassis comprises a pedestal, two ends of the pedestal are rotatably connected with a driving chain wheel and a driven chain wheel respectively, and the driving chain wheel and the driven chain wheel are connected through a transmission chain; the driving chain wheel is driven by a driving assembly to rotate. The top of the pedestal is slidably connected with a sliding seat, and a formwork beam needing to be moved is arranged on the sliding seat. The inner side of the sliding seat is connected with a boss, a guide hole is vertically formed in the boss, a driving rod is inserted into the guide hole, the bottom of the driving rod is connected with a ratchet block, and the ratchet block can be inserted into the transmission chain to drive the pedestal to move along with the transmission chain. Through the driving rod, the ratchet block and the reset spring and by adopting a chain type transmission structure, the ratchet block is inserted into the transmission chain at the starting section, the driven chain wheel ejects the ratchet block out of the gap of the transmission chain at the terminal section, the sliding seat and the template beam on the sliding seat move along the pedestal, a track does not need to be independently fixed, the requirement for the foundation parallelism of a site is low, and the construction efficiency is high. And the cost for burying the track is saved.

The invention discloses heavy-load and self-driven intelligent loading and unloading conveying equipment which comprises a base frame, a brake mechanism, a power roller way, a driving mechanism, a transmission mechanism and a traction structure. The base frame adopts a channel steel full-welded frame and is provided with universal wheels and rolling wheels; the power roller way consists of ten heavy-load main rollers and is connected with a driving motor and a speed reducer through a chain wheel-chain mechanism; the brake mechanism is linked with the mop structure, the protective tube protects the cable, and the position detection sensor and the band-type brake motor realize safety control; the automatic loading and unloading device can cooperate with a tractor to work, the requirement for automatic loading and unloading of goods of 7000 kg is met, the loading and unloading efficiency is improved by more than or equal to 40%, the problems that existing equipment is poor in mobility and large in potential safety hazard are solved, and the automatic loading and unloading device is suitable for small and medium-sized sites and unmanned transfer scenes.

The present application relates to the field of food stacking device, in particular to a carrying and stacking robot for food industrial processing. It comprises a mechanical arm, a bearing frame, a guide ring, a limiting plate, a conveying roller mechanism and a switching mechanism. The mechanical arm has a control end. The bearing frame is connected at the control end. Two guide rings are symmetrically arranged horizontally on the bearing frame. The conveying roller mechanism comprises multiple groups of conveying roller assemblies distributed side by side along the outer contour of the guide ring. Each conveying roller assembly comprises a roller group and two groups of moving assemblies symmetrically distributed about the roller group. Each moving assembly comprises a moving frame for the roller group to rotate and a roller assembly to roll on the guide ring. The roller assembly is rotatably arranged on the moving frame. The switching mechanism comprises three sprockets rotatably arranged on the guide ring and respectively distributed at the three corners of a triangle. The present application can carry and stack a whole layer of goods at a time, with high stacking efficiency.

The invention relates to the technical field of mechanical picking, and discloses a shaking and vibrating harvesting device which comprises a walking mechanism and a rack, and a power unit, a speed control system, an amplitude adjusting system, an output mechanism and an executing mechanism are arranged on the rack; the amplitude adjusting system comprises a supporting bearing seat, an input chain wheel, a power transmission shaft, a spacing output disc and a rope connecting wheel, and the power transmission shaft is arranged on the supporting bearing seat; an input chain wheel and a spacing output disc are arranged at the two ends of the power transmission shaft, and the rope connecting wheel is detachably arranged on the spacing output disc; power output by the power unit is transmitted to an input chain wheel of the amplitude adjusting system through the speed control system; the amplitude adjusting system corresponds to the output mechanism in position, and the executing mechanism is connected to a rope connecting wheel of the amplitude adjusting system and is output after passing through the output mechanism. The walnut harvester is suitable for complex mountain terrains, the shaking vibration amplitude can be adjusted, and the walnut harvesting efficiency is greatly improved.

A platform access system for a wheelchair includes a deployable ramp, actuators, a sensor, and a controller. The deployable ramp includes a first elongated beam having a toothed rack portion arranged thereon. The deployable ramp is moveable, via actuators, on a platform between a first position and a second position. The deployable ramp is vertically pivotable on an edge portion of the platform, with a second end being disposed at a second elevation. The first end of the deployable ramp is securable, via one of the plurality of actuators, to the edge portion, and the toothed rack portion of the first elongated beam is arranged to engage a sprocket of a drive wheel of a wheelchair that is disposed at the second elevation. A communication link of the ramp controller is arranged to communicate with the wheelchair to control the wheelchair to traverse the ramp and access the platform.

The utility model relates to the technical field of pipe chain conveyors, in particular to a pipe chain conveyor steering mechanism which comprises a box shell, a conveying chain and a chain wheel, the conveying chain is meshed with the chain wheel, and the chain wheel is installed inside the box shell through a rotating shaft. The conveying chain is composed of a plurality of chain links, and every two adjacent chain links are connected through a tray hook to form an end-to-end closed-loop structure. Two groups of oppositely arranged correction pipe hubs are arranged in the box shell, the correction pipe hubs are in a horn mouth shape, the chain wheel is clamped between the two groups of correction pipe hubs, and a semicircular annular channel used for bearing a material disc is formed between the two groups of correction pipe hubs. Due to the existence of the correction pipe hub, the chain is always restrained and guided to a certain degree in the moving process, even if tiny direction deviation occurs, the chain can be corrected in time, and therefore the risk of chain disengaging is avoided.

A feeder housing shaft sprocket segment comprising: a sprocket segment body (300) extending in a circumferential direction around a center axis (A) from a leading edge (304) to a trailing edge (306), wherein the leading edge (304) and trailing edge (306) subtend a segment angle about the center axis (A), the segment angle being a first unit fraction of 360°; an outer sprocket perimeter (308) comprising a plurality of teeth (310) evenly arranged in the circumferential direction about the center axis (A) with each tooth (310) spaced by a tooth angle from each adjacent tooth (310), the tooth angle being a second unit fraction of 360°; and a plurality of engagement surfaces (312) extending towards the center axis (A) and facing in the circumferential direction (C), the plurality of engagement surfaces (312) being asymmetrical relative to a plane (P) defined by the center axis (A) and a radial projection from the center axis (A) that bisects the sprocket segment body (300) midway between the leading edge (304) and the trailing edge (306).

The invention discloses floating coal dust treatment equipment of a thermal power generation coal conveying system, and relates to the technical field of thermal power generation coal dust treatment. The floating coal dust treatment equipment for the thermal power generation coal conveying system comprises a dust collection barrel body, and a dust passing net is assembled on the top of the dust collection barrel body; and the air exhaust pipeline penetrates through the dust collection barrel main body. According to the floating coal dust treatment equipment for the thermal power generation coal conveying system, an air extracting pump is started, corresponding air extracting operation is carried out through an air extracting pipeline and a connecting cover, a fixed bin, a wind wheel, a first bevel gear, a first transmission rod, a second bevel gear, a first chain wheel, a chain, a reciprocating lead screw, a second chain wheel and a movable block are matched, and a cleaning brush plate reciprocates on an air passing net; according to the dust collection barrel, the dust collection barrel body is arranged, coal dust attached to the air passing net is cleaned into the dust collection barrel body, when the dust collection barrel is synchronously used with spraying and dust falling equipment, the coal dust with certain viscosity attached to the air passing net is cleaned, and the use efficiency of the dust collection barrel is improved.

The invention belongs to the technical field of tool magazines, and particularly relates to a rotary tool magazine mechanism which comprises a box body, two driving shafts are rotationally connected to the back face of the box body, chain wheels fixedly sleeve the two driving shafts respectively, a chain is connected between the two chain wheels jointly, a plurality of tool sleeves used for loading tools are installed on the chain, and a first motor is fixedly connected to the rear end of the box body. A first gear is installed on an output shaft of the first motor, a second gear is installed on the driving shaft adjacent to the first motor, the first gear and the second gear are connected in a meshed mode, a cutter cleaning mechanism is arranged in the box body, and a cutter taking mechanism is arranged on the box body. According to the device, an output shaft of a first motor drives a first gear to rotate, then the first gear enables a chain wheel to rotate around a driving shaft by meshing with a second gear, then the chain wheel and a chain drive a tool sleeve to operate, a tool is moved to a tool taking mechanism, and in the operation process of the tool sleeve, a tool cleaning mechanism is triggered to act; and chippings loaded on the cutter in the cutter sleeve are cleaned up.

This invention relates to the field of aluminum profile extrusion molding technology, specifically to a high-strength, high-toughness, wide-width, thin-walled aluminum profile extrusion molding equipment, comprising a base; a placement plate is fixedly connected to the top of the outer wall of the base via a pair of support columns; a heating device is provided at the top of the outer wall of the placement plate; a placement groove is formed at the top of the outer wall of the base; a motor is fixedly connected to the inner side wall of the placement groove; a rotating shaft is provided at the output end of the motor; the invention uses a motor to drive the rotating shaft to rotate, which in turn drives a rotating rod to rotate via a sprocket and a chain, which in turn drives a rotating rod to rotate via a sprocket and a chain, thereby driving a pair of conveying rollers to rotate, causing the aluminum rod to move towards the shearing mechanism via the conveying rollers, and then the aluminum rod is sheared by the shearing mechanism and extruded by the extrusion mechanism. This device completes aluminum profile extrusion molding with a single motor, reducing the use of a power source, energy consumption, and cost.

The utility model discloses a bearing ring cleaning device which comprises a cleaning box, a transmission mechanism, a hanging rod and a compression roller assembly, and a plurality of ultrasonic generators are installed on the side wall of one side of the cleaning box. The transmission mechanism comprises two symmetrically-arranged transmission chains, a plurality of transmission chain wheels and guide chain wheels are rotationally installed on the side walls of the two sides of the cleaning box, the transmission chains are wound around the transmission chain wheels and the guide chain wheels, the transmission chains are integrally arranged in a concave shape, a plurality of supporting plates are arranged on one sides of the transmission chains, and frame plates are arranged on the supporting plates. The compression roller assembly comprises a roller, the two sides of the roller are connected with the top plate through connecting rods, and when the bearing ring is transmitted to the lower end of the roller, the roller makes contact with the outer wall of the bearing ring. According to the bearing ring cleaning device, the compression roller assembly is arranged in the cleaning box to drive the bearing ring to generate certain displacement on the hanging rod, so that the contact area of the bearing ring and the hanging rod is exposed, and the cleaning effect of the bearing ring is guaranteed.

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

The utility model relates to the technical field of magnetic separators, in particular to a multistage super-strong concentration magnetic separator which comprises a magnetic separation box, a first chain wheel is rotationally connected to the outer surface of the magnetic separation box, a driving cylinder is rotationally connected to the inner wall of the magnetic separation box, a reciprocating groove is formed in the outer surface of the driving cylinder, and a driving strip is arranged in the magnetic separation box; and the outer surface of the driving strip is rotationally connected with a driving rod. Through the arrangement of components such as a driving cylinder and a driving rod, the driving cylinder and the driving rod are matched with each other, so that the driving rod cylinder can drive a first brush plate, a second brush plate and a third brush plate to reciprocate through the components such as the driving rod and a driving strip; and therefore, the effect of scraping and sweeping the lower surfaces of the first conveying belt, the second conveying belt and the third conveying belt by arranging a first driving cylinder and a driving rod is achieved, and the defect that magnetic materials attached to the surfaces of the conveying belts are inconvenient to clean in an existing technical scheme is overcome.

The invention relates to the technical field of chain wheel production, in particular to a cutting and polishing combined machining device and method for hoisting chain wheel production, which comprises a blank chain wheel, a cutting tool for cutting the blank chain wheel and polishing teeth for polishing the blank chain wheel, and further comprises a sleeve rod, and a plurality of fastening plates for supporting the inner wall of the blank chain wheel are arranged on the outer surface of the sleeve rod. A plurality of piston rods connected with the fastening plate are arranged on the outer surface of the sleeve rod, a fixing assembly for driving the piston rods to move is arranged in the sleeve rod, a buffering tray for supporting the sleeve rod is flexibly connected to the top of the sliding rod, and a buffering cavity for storing oil is formed in the sliding rod. The two ends of the buffering cavity are slidably connected with connecting rods matched with the buffering cavity, the bottom of the buffering tray is connected with buffering assemblies matched with the connecting rods, the position adjusting block is arranged in the buffering cavity and used for monitoring flowing of oil in the buffering cavity, and a compensation assembly for changing the position of the sliding rod to adjust the pressure of the oil is arranged in the sliding rod.

The utility model discloses an oil-gas separation mechanism and an engine, the oil-gas separation mechanism comprises an air inlet cam shaft, a chain wheel, a centrifugal separation disc and a breather pipe, and the air inlet cam shaft is provided with a first channel penetrating through the two ends of the air inlet cam shaft; the chain wheel is meshed with a timing chain of an engine and used for driving the air inlet cam shaft to rotate. The centrifugal separation disc is connected with one end of the air inlet cam shaft and provided with a separation cavity, the separation cavity communicates with the first channel, fan blades are arranged in the separation cavity, the centrifugal separation disc rotates to suck mixed oil gas into the separation cavity, and the fan blades guide gas into the first channel and throw engine oil out of the separation cavity. The breather pipe communicates with the end, away from the centrifugal separation disc, of the first channel and is used for exhausting gas in the first channel. According to the oil-gas separation mechanism, the oil-gas separation structure can be arranged on the air inlet cam shaft, the space occupied by the oil-gas separation structure in an engine is reduced, the internal structure of the engine is simplified, and the manufacturing difficulty and manufacturing cost of the engine are reduced.

The invention relates to the field of cranes, and provides a self-lubricating-based intelligent electric chain crane and control system.The self-lubricating-based intelligent electric chain crane comprises a machine body, a driving assembly and a chain wheel assembly which are connected, a chain is connected to the chain wheel assembly, a first bevel gear is fixedly connected to the chain wheel assembly, and a driving rod is rotationally connected to the inner wall of a machine cavity; an oil guide box, an oil storage box and a processing cylinder are fixedly connected to the inner wall of the machine cavity, the driven rod is rotationally connected to the oil guide box, a first one-way valve and a second one-way valve are connected to the inner wall of the oil guide box, and the oil storage box is fixedly connected with the oil guide box. The inner wall of the machine cavity is rotatably connected with a swing part through an automatic reset rotating shaft, the swing part is in rolling connection with a ball, the top wall of the treatment cylinder is slidably connected with two oil guide blocks, the oil guide blocks are connected with the inner wall of the machine cavity through elastic parts, and inclined plane parts are fixedly connected to the oil guide blocks. According to the chain self-lubricating device, the automatic avoiding function between the chain and a component is achieved, and meanwhile the chain self-lubricating function is achieved.

A bicycle includes a suspension system of the rear wheel, where the crankset and the hub and sprocket each include at least one chainring engaged by the chain and a rotation shaft. A compensation device is interposed between the toothed plate and the shaft to allow an angular compensation stroke between them from a rest position corresponding to the absence of the pulling of the chain, to a compensation position, corresponding to a pulling action of the chain generated by the rear suspension. The compensation device includes a plurality of pairs of brake elements and respective compensation end elements where at least one shock-absorbing element is operationally interposed between at least one pair capable of deforming only in correspondence with a final portion of the compensations stroke and between at least another pair where at least one limiting element is interposed to limit the maximum deformation of the shock-absorbing element.

The utility model discloses a soil loosening device for forestry planting, which comprises a vehicle body, a soil turning device is arranged on the front side of the vehicle body, the soil turning device comprises a soil turning plate, a movable plate, a transmission shaft, a rotary tillage frame, a connecting frame, a connecting shaft, a matching plate and an adapting plate, the soil turning plate is arranged on one side of the movable plate, the transmission shaft is arranged above the vehicle body, the rotary tillage frame is arranged below the vehicle body, and the connecting shaft is arranged above the vehicle body. One end of the connecting frame is rotationally connected with the adaptive plate, the two ends of the connecting shaft are connected with the matching plate, the other end of the adaptive plate is rotationally connected with the matching plate, a crushing device is installed on the outer side of the vehicle body and comprises a rotating plate, a connecting plate, a sliding frame and conical blocks, and the multiple conical blocks are connected to the bottom end of the sliding frame; the linkage device comprises a rotating shaft, a chain wheel and a chain, the chain and the chain wheel are used in a matched mode, the efficiency and quality of soil loosening operation in forestry planting are improved, production cost and human input are reduced, and meanwhile the consistency of the running rhythm of a plurality of working parts is guaranteed.

A guard assembly for a chain and chain ring includes a bracket and a guard. The bracket and the guard are configured to move relative to one another. The movement is governed by a resilient spring placed to absorb and release impact energy imparted to the guard.

The application provides a handheld power tool, and relates to the technical field of electric tools.The handheld power tool comprises a housing, a handle arranged on the housing, a motor arranged in the housing, a transmission mechanism comprising a transmission component, a coaxially arranged output disc and a chain wheel, the transmission component being connected with the motor, and the output disc being matched with the transmission component, and a saw chain sleeved on the chain wheel; wherein the center line L1 of the saw chain intersects with the center line L2 of the motor at a first intersection point S1, the center line L1 of the saw chain intersects with the center line L3 of the handle at a second intersection point S2, and the first intersection point S1 and the second intersection point S2 are both arranged on the outer side of the output disc. By arranging the first intersection point S1 and the second intersection point S2 on the outer side of the output disc, the included angle between the saw chain and the motor and the handle is reasonably arranged.

A chainsaw is provided, enabling to remove sawdust conveyed inside a main body efficiently, which has a main body including: a guide bar; a saw chain wound around the guide bar and the drive sprocket; a drive sprocket disposed behind the guide bar, having a rotation shaft in a right / left direction of the main body and rotated to move the saw chain along the guide bar; and a guide wall including an arcuate first wall along the drive sprocket with a predetermined gap from the saw chain and a second wall extended rearward via a connecting portion to the first wall, and when seen from the right / left direction, a angle between: a first direction along a vertical direction of the main body; and a second direction passing through the center of the rotation shaft and an apex of the connecting portion is between 0° and 30°.

Snowmobile transmission, including a housing with a cover, an input shaft and an output shaft arranged inside the housing, and a chain transmission drive including a chain connecting a drive sprocket arranged on the input shaft to a driven sprocket arranged on the output shaft, a reverse gear axle about which a reverse gear sprocket freely rotates also arranged inside the housing, the reverse gear sprocket engaging with the chain, and a reverse gear engaging with a movable gear arranged on a grooved sleeve of the input shaft, which is movable by tilting an inner switching fork and being driven by an axle with a lever, an adjusting rod, an outer switching fork, wherein rotation of the outer switching fork is restricted by a removable sector attached to the housing cover, and an adjusting screw arranged on the housing, abutting against a support sleeve and fixed by a cotter pin.