57results about How to "Avoid partial wear" patented technology

The invention is suitable for the field of cycloidal speed reducers, and provides an RV speed reducer which comprises a shell assembly, an input assembly and a speed reduction assembly and is characterized in that the shell assembly comprises a front supporting shell, a rear supporting shell, a positioning bolt and a positioning shaft, and the front supporting shell and the rear supporting shell are fixedly installed through the positioning bolt; positioning holes are annularly formed in the supporting front shell and the supporting rear shell, the positioning shaft is installed in the positioning holes in a rolling mode, the speed reduction assembly comprises a speed reduction sealing cover, a planet assembly and a main speed reduction assembly, the speed reduction sealing cover is installed in the supporting front shell through a bearing, and the circle center of the speed reduction sealing cover coincides with the circle center of the supporting front shell; and the kinetic energy transmission efficiency and the maximum running speed are improved, so that the joint is more suitable for high-speed robot speed reduction joints. Pitting corrosion, micro pitting corrosion and eccentric wear of the balance wheel are avoided, and the service life of the speed reduction assembly is prolonged.

The utility model discloses a drum brake of a commercial vehicle and an axle assembly. The drum brake of the commercial vehicle comprises a brake bottom plate, two brake shoes and a cam shaft, the brake shoe comprises a wing plate, two opposite web plates and a friction plate, each web plate comprises a first end and a second end, a pin roller is installed between the first ends of the two web plates, a supporting pin is installed between the second ends of the two web plates, each web plate comprises a first section, a deviation section and a second section, the first section extends to the deviation section from the first end, and the second section extends to the deviation section from the second end. The offset section is connected between the first section and the second section so that the distance between the second sections of the two web plates can be larger than the distance between the first sections of the two web plates. Two pin holes are formed in the brake bottom plate, the supporting pins on the two brake shoes are connected into the two pin holes in a penetrating mode respectively, and the supporting pins are in interference fit with the inner walls of the pin holes. And an S-shaped cam is arranged on the cam shaft and is arranged between the pin rollers on the two brake shoes. According to the utility model, the problem of eccentric wear of the friction plate is solved, and the braking safety of a vehicle is improved.

The invention provides an axial plunger pump with vibration reduction and clearance self-adaptive adjustment functions, which comprises a plunger cylinder body assembly, and the plunger cylinder body assembly is composed of a plunger, a cylinder body, magnetorheological fluid, a permanent magnet plunger barrel and a plunger hole; a cavity is formed between the inner wall and the outer wall of the plunger, the cavity is filled with the magnetorheological fluid, and the magnetorheological fluid can freely flow in the cavity; under the action of external magnetic force, the magnetorheological fluid has a chain structure; the plunger holes are formed in the cylinder body in a circumferential surrounding manner, and the plunger holes are used for accommodating the permanent magnet plunger barrel and the plunger; the permanent magnet plunger barrel is detachably fixed on the cylinder body; the plunger is embedded into the permanent magnet plunger barrel, and the permanent magnet plunger barrel is in clearance fit with the plunger; by arranging the plunger, the permanent magnet plunger barrel and the magnetorheological fluid, the viscosity of the magnetorheological fluid is changed under the action of a magnetic field to increase damping force, meanwhile, the magnetorheological fluid flows to enable the plunger to adjust the gap between the plunger and the cylinder body in a self-adaptive mode, and eccentric wear is avoided.

The utility model relates to a tread pattern structure of a light-duty radial tire. The tread pattern structure comprises a tire tread, transverse patterns and longitudinal patterns, wherein the transverse patterns and the longitudinal patterns are arranged on the tire tread; the tire tread (1) is composed of ten equal segmented molds, a central longitudinal pattern block (5) is arranged in the center of the tread, S-groove-bottom longitudinal straight grooves (2), longitudinal zigzag pattern grooves (3) and longitudinal pattern blocks (6) which are in the same direction are evenly distributed in the direction from the center line in the circumferential direction of the tire tread to the two sides of the tire tread respectively, arc transition design is adopted for the groove bottoms, heat dissipation shoulder grooves are distributed in the shoulder portions of the tire, and the longitudinal pattern blocks (6) are arranged in the longitudinal straight grooves (2) and the longitudinal zigzag pattern grooves (3). Shoulder heat dissipation is improved, and shoulder cracks are avoided. Compared with the prior art, the tire adopting the pattern form has higher wear resistance, the pattern adopts the design of two longitudinal main grooves, two longitudinal zigzag main grooves and auxiliary heat dissipation shoulder grooves, and enlarged apex and super-strong framework materials are used, so that the probability of early damage of the tire caused by eccentric wear, non-uniform wear, stone clamping prevention and the like is reduced.

The utility model discloses a fire grate segment, a fire grate frame and a small garbage incinerator, and belongs to the technical field of environmental protection. The fire grate segment comprises a fire grate segment cover plate, a fixed shaft position and a plurality of parallel rib plates are arranged at the lower end of the fire grate segment cover plate, and vent holes are formed in the side end of the fire grate segment cover plate. A vent groove is formed in the upper surface of the fire grate segment cover plate; the fire grate segments are fixed through the fixing shaft positions, the heat dissipation performance of the fire grate segments is improved through the rib plates, and the ventilation capacity of the fire grate segments is increased through the ventilation holes and the ventilation grooves. According to the fire grate segment disclosed by the utility model, the plurality of rib plates are longitudinally arranged in the fire grate segment cover plate, so that the strength is ensured, and the heat dissipation performance of the fire grate is improved; by arranging the first axial position and the second axial position, the fire grate segment is prevented from eccentric wear and tilting to a certain extent, the use requirement of the garbage incinerator can be met, the structure is simple, and meanwhile the production and maintenance cost is reduced by adopting an integrated casting.

The application discloses a kind of automatic cleaning device for shield machine cutter, it is related to tunneling equipment technical field, including including shield machine main body and cutter head body, the cutter head body is arranged on the surface of shield machine main body, the side annular array of shield machine main body is close to cutter head body and is provided with several water pipe grooves, the inside of water pipe groove is all fixedly connected with water outlet cavity, the inside of shield machine main body is located on the side of water outlet cavity away from cutter head body and is provided with annular water storage chamber, the annular water storage chamber is used to store water.The application can flush cutter and cutter head in real time when shield machine is normally tunneling, just remove in time when sundries is just attached, block mud cake formation and muck jam from source, continuously keep the surface of cutter clean, avoid cutter jam and eccentric wear problem from root.

The utility model discloses a multi-wedge type reverse sliding clutch, which comprises a central sleeve and a pressure plate, the central sleeve comprises an end plate and an annular part, no less than four groups of inner convex structures are distributed on the wall of an inner hole of the annular part in a circumferential array mode, and wedge blocks with the same number as the inner convex structures are distributed on the inner side of the pressure plate in a circumferential array mode. The wedge block is provided with an inclined surface on the side wall in the circumferential direction of the pressure plate, and the end part of the inner convex structure is provided with a chute matched with the wedge block; hollow columns extending into the annular part are distributed on the inner side of the pressing disc, connecting columns extending into the hollow columns are distributed on the inner side of the end plate, limiting pieces are installed at the ends of the connecting columns, sinking tables are arranged at the ends, close to the end plate, of the hollow columns, the connecting columns are sleeved with elastic elements, and the two ends of the elastic elements are supported on the sinking tables and the limiting pieces respectively. The inner convex structures and the connecting columns are sequentially and alternately distributed in the annular part in the circumferential direction. The pressing plate has the beneficial effects that four or more wedge blocks are arranged, so that the pressing plate moves more stably, and the eccentric wear phenomenon is not prone to occurring.

A loader frame articulation structure, belonging to the field of engineering machinery, includes a front frame and a rear frame, connected by an articulation assembly. The articulation assembly includes an articulation shaft, which is fixedly mounted on the front frame, and the rear frame is rotatably connected to the articulation shaft. The articulation shaft includes a cylindrical portion and a truncated cone portion. The truncated cone portion is fixedly mounted on the upper end of the cylindrical portion and installed within an articulation hole in the front frame. A mounting plate is mounted on the upper end of the truncated cone portion, and the mounting plate is fixedly connected to the front frame by bolts. The cylindrical portion is rotatably connected to the rear frame, and the lower end of the cylindrical portion is connected to the articulation hole on the front frame via a bushing. The use of a conical surface fit at the loader's articulation structure significantly improves the assembly accuracy and connection strength at the articulation point, thereby solving the connection strength problem at the articulation point under extreme working conditions and the fatigue wear problem caused by the increasing use time of the loader, effectively reducing the failure rate of the loader product.

The utility model provides a kind of rhythmic vibration machine, it is related to fitness equipment technical field, including base, lower support, upper support and pedal, lower support is fixed with base, upper support is fixed with pedal, and lower support is equipped with rhythmic module, including drive motor, pivot and the cam connected with pivot by eccentric bearing, drive motor drives pivot by transmission mechanism, drives cam to make upper support rhythmic up and down;Meanwhile, vibration module is equipped on the side of upper support away from drive motor, for generating high-frequency vibration. By efficiently integrating rhythmic and vibration function in one, compact structure, and the stability of both simultaneous operation is improved by effectively avoiding motion interference with the layout of the two, so that users can simultaneously obtain the dual effect of full-body rhythmic exercise and local muscle deep relaxation.

The utility model relates to a kind of ejection force reinforcing structure based on small elastic block, belongs to injection mould technical field, including injection mould, the injection mould is equipped with injection product, the injection product side lower end is equipped with ejection elastic block subassembly with injection mould interval.The ejection elastic block subassembly includes elastic block, the elastic block is equipped with the isohypse screw extending out the lower end of elastic block, the isohypse screw and the elastic block are equipped with the boss with isohypse screw hole type screw thread sleeve joint, the lower part of the elastic block and isohypse screw are equipped with the spring with isohypse screw sleeve joint.It has the characteristics of simple structure, good effect and high running stability.Through ejection elastic block subassembly, more powerful, more stable ejection force is provided in limited space, the powerful, stable, accurate ejection to difficult demoulding product is realized, while ensuring the accuracy of ejection action and the long life of mould.

A brake handle with a dynamically variable rotation center in the braking process comprises a brake shell, a piston assembly, a push rod assembly, a brake handle, a multi-fulcrum linkage component and a rotation switching mechanism. The shell is provided with a piston cavity. The handle drives the piston to move through the push rod. The linkage component is provided with two rotating fulcrums, and the switching mechanism can switch two working states. When the front section of the handle is pinched, the handle rotates around the first fulcrum, idle stroke is eliminated, and operation is labor-saving. When the rear section is pinched, the second fulcrum is switched to rotate, and the lever ratio is increased to improve braking force. By means of automatic switching of double fulcrums, labor-saving control and large braking force output are both considered, and the problem that a traditional hydraulic brake handle is poor in performance is solved; the modular structure is easy to adapt to mass production, and switching nodes are accurate and controllable; a locking and failure protection structure is arranged, so that the operation is stable and safe; meanwhile, eccentric wear of parts is eliminated, the service life of sealing pieces is prolonged, and braking efficiency and use safety are improved.

The utility model belongs to the field of automobile engineering, and particularly relates to an automobile brake caliper structure which comprises a shell, a first connecting rod is fixedly connected to the top of the shell, a hydraulic hole is formed in the surface of the shell, and a transmission mechanism is arranged in the shell. The transmission mechanism comprises two sleeves fixedly connected to the two sides of the interior of the shell, the interiors of the two sleeves are both slidably connected with sliding rods, one end of each sliding rod is slidably connected with a brake pad, a buckle mechanism is arranged in each sliding rod, and the buckle mechanisms are used in cooperation with the brake pads; by arranging the transmission mechanism, the brake pads on the two sides of the floating type brake calipers can almost simultaneously and evenly press the brake disc, eccentric wear of the brake disc caused by braking force loss generated by successive contact of the brake pads is avoided, replacement of new and old brake pads can be completed by arranging the buckle mechanism without disassembling chassis components, and the replacement efficiency is improved. And the maintenance cost and the time cost of the vehicle are reduced.

This utility model provides an integrated braking device for a suspended bogie, belonging to the field of railway vehicle technology. It includes a braking assembly, a transmission assembly, an air drive assembly, and a suspension assembly. The braking assembly includes a first brake beam and a second brake beam spaced apart. The transmission assembly includes a first push rod, a second push rod, a first transmission member, and a second transmission member. One end of both the first and second push rods is hinged to the second brake beam. The first and second transmission members are located at opposite ends of the air drive assembly. The first transmission member is hinged to the air drive assembly, the first brake beam, and the first push rod, respectively. The second transmission member is hinged to the air drive assembly, the first brake beam, and the second push rod, respectively. The first and second brake beams are connected to the bogie crossbeam via the suspension assembly. This utility model reduces the bogie's lower mass, improves the vehicle's dynamic performance, and also enhances the vehicle's braking and release performance.

The invention relates to the technical field of marine ropes, in particular to a wheel barge mooring rope inserting method, eight strands of mooring ropes and twelve strands of mooring ropes are inserted in two directions, the eight strands of mooring ropes are made of polypropylene filament yarn or yellow polyester, the twelve strands of mooring ropes are made of ultra-high molecular weight polyethylene, and the two kinds of mooring ropes give full play to respective advantages after being inserted. The cable made of the polypropylene filament yarn and the yellow polyester acrylic material is low in price, high in density and large in elasticity, the cable made of the ultra-high molecular weight polyethylene material is high in price, low in density, small in elasticity, high in strength and resistant to abrasion, the cable formed by inserting the eight-strand cable and the twelve-strand cable has very high breaking strength and is light and fast to use as a working cable, the breaking probability is reduced, and the service life of the cable is prolonged. And by adopting the cable inserting method, inserting is convenient, consumed time is short, consumables are few, and cost is saved. In addition, the mooring rope inserted by adopting the mooring rope inserting method is low in water absorption and light, the labor intensity of personnel is relieved, and the working efficiency and safety of the personnel are improved.

The application provides a self-cleaning hob of a disc cutter assisted by a cavitation water jet, which comprises a hob side plate, a disc cutter and a cleaning component; the disc cutter is arranged between the two hob side plates through a cutter shaft, the two ends of the cutter shaft are detachably arranged on the two hob side plates, and the disc cutter can rotate around the cutter shaft; the cleaning component is rotatably arranged on the side of the cutting edge of the disc cutter and can clean the cutting edge of the disc cutter; the disc cutter is provided with a transmission assembly, the transmission assembly is in transmission connection with the cleaning component; the transmission assembly can rotate together with the disc cutter, so as to drive the cleaning component to rotate; the scheme provided by the application can fundamentally improve the tunneling efficiency, solve the problem of mud accumulation of the cutter head of the tunneling machine, reduce the eccentric wear of the cutter ring, prolong the service life of the cutter, shorten the construction period and reduce the engineering cost, so as to achieve the purpose of reducing the construction burden and make up for the deficiency of the existing mud accumulation response measures of the cutter head.

The invention discloses an integrated wave power generation hydraulic energy conversion device and a hydraulic cylinder thereof, and the conversion device comprises a floating mechanism which floats on the sea surface, sleeves the hydraulic cylinder, and is used for driving a hydraulic cylinder piston pull rod fixed on the floating mechanism to move up and down along with the up and down fluctuation of waves; the guide mechanism is fixedly mounted at the top end of the hydraulic cylinder and is used for realizing the vertical movement of the piston pull rod relative to the hydraulic cylinder; the anti-eccentric-wear mechanism is arranged above the guide mechanism and is used for connecting a piston pull rod of the hydraulic cylinder and a cross beam of the floating mechanism, so that the device rotates by a certain angle to counteract transverse force borne by the device, and eccentric wear caused by irregular movement of the floating mechanism is avoided; and the hydraulic cylinder is used for converting the mechanical energy of the oscillating body into pressure energy of hydraulic oil, then the pressure energy is used for driving the hydraulic motor to rotate through power transmission of the hydraulic valve bank and the pipeline, and then the generator is driven to generate electricity.

This invention provides a straightening guide for a screw pump sucker rod, comprising: a housing; a plurality of straightening blocks evenly arranged on the outer surface of the housing; a top rod concentrically arranged inside the housing, with ball heads at both ends of the top rod; and connector assemblies disposed at both ends of the housing for connecting an upper sucker rod and a lower sucker rod, respectively. The connector assemblies include a ball-and-socket type connecting seat fixedly connected to the end of the housing and a ball-and-cap connector adapted to the ball-and-socket type connecting seat. The inner wall surface of the ball-and-socket type connecting seat is constructed as a first inner spherical surface, and an inner drive tooth is provided on the first inner spherical surface. The ball-and-cap connector includes a ball-and-cap body, the outer surface of which is provided with radially extending outer drive teeth, and the interior of the ball-and-cap body forms a second inner spherical surface adapted to the ball head. The outer drive teeth and the inner drive teeth mesh to form a meshing pair, allowing the ball-and-cap connector to bend relative to the housing and to straighten the sucker rod via the straightening blocks.

This utility model discloses a special chopping knife for titanium forging parts, relating to the field of forging equipment technology. The utility model includes a base, with the chopping knife body disposed inside the base; an anti-detachment mechanism is provided on one side of the base, comprising a fixed box fixedly connected to one side of the base, and a fixed cylinder disposed inside the fixed box. This utility model, through the synergistic effect of the worm gear transmission and the mechanical interlocking of the locking rod and locking hole in the anti-detachment mechanism, effectively prevents the mounting bolts from loosening due to vibration. The self-locking characteristic of the worm gear ensures that the locking rod will not rotate on its own due to reverse load after locking, while the structure of the locking rod inserting into the locking hole of the limiting disc forms a physical limit, providing double protection for installation stability and avoiding safety accidents caused by the chopping knife falling off. The transmission design of the first bevel gear and the second bevel gear in the drive mechanism converts the rotational motion input from the handle into the axial drive of the worm gear.

This utility model relates to the field of feed processing machinery technology, specifically a differential speed double-roller feed crusher, which solves the problems mentioned in the background art. It includes a frame, a first and second roll arranged parallel to each other within the frame, and an adjustment mechanism for adjusting the roll gap between the first and second rolls. The frame also has a pair of second bearing seats that can move radially along the rolls. The two ends of the second roll are supported in the second bearing seats by bearings. A spring buffer device is provided between the second bearing seats and the frame. In this utility model, when an unbreakable hard object passes between the two rolls, the enormous impact force overcomes the preload of the pressure spring, pushing the second bearing seats and the second rolls backward together, instantly widening the roll gap and allowing the hard object to pass through. This avoids equipment jamming, roll damage, or transmission system damage, providing excellent overload protection.

This application relates to the field of overhead contact line accessories technology, and provides an overhead contact line compensation device. The device includes: a pulley block equipped with a compensation rope, one end of which extends to the outside of the pulley block to form a connecting section for connecting a weight; a connecting frame mounted on the pulley block; and a limiting part fixed to the connecting frame, forming a limiting channel extending vertically through the limiting part. The connecting section passes through the limiting channel to restrict the horizontal movement of the compensation rope relative to the pulley block. When the weight swings, the limiting channel restricts the horizontal swing amplitude of the connecting section; when the pulley block swings, the limiting part swings with the pulley block via the connecting frame, and the inner wall of the limiting channel pushes the connecting section to swing with the pulley block, ultimately limiting the range of movement of the compensation rope relative to the pulley block, preventing uneven wear between the compensation rope and the pulley block grooves, and improving the lifespan and reliability of the overhead contact line compensation device.

The utility model relates to a tread pattern structure of a medium-short distance all-steel truck radial tire, which is characterized in that three rows of Z-shaped zigzag grooves in the same direction are distributed on a tire tread along the circumferential direction of the tire tread, and main pattern blocks with irregular pentagonal structures are distributed between the adjacent Z-shaped zigzag grooves to form two rows of blocky pattern columns; an inclined shallow groove is formed between every two adjacent main pattern blocks in each row. And the main pattern blocks in the block-shaped pattern columns on the two sides of the central zigzag groove are reversely arranged in a staggered manner along the circumferential direction. A plurality of stone discharging blocks are arranged at the bottom of the Z-shaped zigzag ditch in the extending direction of the Z-shaped zigzag ditch, and the stone discharging blocks comprise main stone discharging blocks and auxiliary stone discharging blocks which are sequentially and alternately connected. A plurality of knife-shaped shallow grooves are evenly distributed in the shoulder portions of the tire tread, a plurality of block-shaped heat dissipation square grooves are evenly distributed below the two shoulder portions of the tire tread, and a plurality of exhaust holes are evenly distributed in the peripheries of the main pattern blocks. Compared with the prior art, the tire tread pattern structure disclosed by the utility model has the advantages of low rolling resistance, strong road holding force, good stone discharging performance and the like.

The invention relates to the technical field of tread pattern design, and discloses a tire with concave-convex grooves in tread pattern groove walls, which comprises a tread, four circumferential grooves formed in the tread and extending along the tire circumference C direction, and transverse grooves extending towards the outer side of the tire width L direction. The circumferential grooves and the transverse grooves divide the tread into a plurality of block-shaped patterns, and the block-shaped patterns sequentially comprise an inner side shoulder block, an inner side close-to-center block, a middle block, an outer side close-to-center block and an outer side shoulder block from the inner side to the outer side of the tire. According to the tire with the concave-convex grooves in the tread pattern groove wall, the transverse groove of the tread is optimally designed, the groove wall of the groove is specially designed, and design parameters such as the position and the size of the concave-convex grooves in the groove wall are reasonably configured, so that the effects that the noise, the control safety performance and the durability can reach relatively high levels, and other performances are kept optimal are achieved.

The utility model discloses a self-adaptive valve rod eccentric wear prevention mechanism of a lever type regulating valve, which belongs to the technical field of lever type regulating valves and comprises a valve body and a valve rod, a valve cover is arranged at the top of the valve body, the valve rod is arranged at the top of the valve cover, and a first fixing clamp and a second fixing clamp are arranged on the outer side of the valve cover. The first fixing clamp and the second fixing clamp are clamped to the outer side of the valve deck, a guide frame is arranged on the right side of the second fixing clamp, first movable plates are arranged on the two sides in the guide frame, a second movable plate is arranged at the bottom in the guide frame, the bottom of the movable valve rod makes contact with the second movable plate, the first movable plate moves towards the two sides, and the second movable plate moves towards the bottom. The valve rod is prevented from deviating, it is ensured that the valve rod smoothly moves up and down, deviation is avoided, and eccentric wear of the valve rod is completely eradicated; the first fixing clamp and the second fixing clamp are connected to the outer side of the valve deck in a sleeving mode, the first fixing block and the second fixing block are connected, then the fastening bolt is nailed in to fix the guide frame, and the stability of the guide frame in the using process is improved.

A marine motor with eccentric end cover, comprising a frame, an end cover connected to the frame, a stator connected to the end cover in the frame, a bearing connected to the end cover, a rotating shaft connected to the bearing through a bearing bush, and a rotor corresponding to the stator and arranged on the rotating shaft; the axial center of the end cover is offset relative to the axial center of the rotating shaft, and the fit clearance between the bearing bush and the rotating shaft and between the stator and the rotor is adjusted by adjusting the offset degree of the end cover relative to the rotating shaft. The invention solves the problems of uneven distribution of bearing clearance and stator-rotor air gap caused by the self-weight sag of the rotating shaft in the traditional concentric end cover type marine motor, complicated assembly and debugging, and difficult on-site clearance correction.

The utility model provides a guide tow dual -purpose truck tire belongs to tire technical field, including the tread, the tread includes a plurality of middle part longitudinal grooves and edge part longitudinal grooves which are set up along the circumferential extension, the middle part longitudinal groove and edge part longitudinal groove divide the tread into a plurality of pattern bars, the pattern bar includes the middle part pattern bar at the tread center line, a plurality of oblique through -going horizontal grooves are set up on the middle part pattern bar, the third horizontal steel sheet of horizontal through -going is set up between adjacent horizontal grooves, wherein, the angle of horizontal groove and tire axial is 40 ~ 45 DEG, the depth of horizontal groove is 1 / 3 ~ 1 / 5 of the depth of middle part longitudinal groove, the width of horizontal groove is 1mm ~ 4mm. The utility model tire product considers high load, torsion resistance, wear resistance, steering nimble and stronger ground adaptability simultaneously, improves the engagement performance and tow performance of tire on the wet and slippery road surface.

The invention relates to a plunger pump, in particular to a valve flow distribution axial plunger pump which comprises a pump shell, a cylinder body, plungers, a swash plate, sliding shoes, a pressing mechanism and an input shaft connected with the swash plate. The pump shell is provided with an oil inlet communicated with a cavity where the swash plate is located, and the plunger oil pressing cavities are connected with a pump oil discharge outlet through oil discharge one-way valves respectively. The pressing mechanism comprises a return plate connected with the sliding shoes in a sleeving mode, an elastic pressing plate fixedly connected with the return plate and a pressing ball head arranged in the center of the end face of the cylinder body. Oil suction channels communicated with the plunger oil pressing cavities are formed in the sliding shoes and the plungers; an oil inlet groove communicated with the oil suction channel on the sliding shoe is formed in the oil suction area of the swash plate; the middle of the elastic pressing plate is provided with a pressing ball seat which abuts against the pressing ball head in a matched mode. The number of parts of the pressing mechanism is small, the structure is simple, the pressing ball head applies acting force to the return plate through the elastic pressing plate, large return force is obtained in a limited space, and eccentric wear of the sliding shoe caused by insufficient return force is avoided.

The application relates to the technical field of railway vehicle maintenance, in particular to an axle box towing wheel which comprises a locking support for supporting an axle box and a pulley assembly arranged at the lower side of the locking support. The application has the effect of improving the problem that the axle box is directly contacted with the ground and is easy to be deformed and damaged when the wheel set is removed for maintenance.

The utility model relates to the technical field of automobile sliding doors, in particular to a sliding door limiting device and an automobile, the sliding door limiting device comprises a convex block assembly and a concave block assembly, the convex block assembly comprises a convex block base, a first boss arranged on the convex block base in a protruding mode and a second boss arranged on the first boss in a protruding mode, the concave block assembly comprises a concave block base, a third boss and a groove, the third boss is arranged on the concave block base in a protruding mode, the groove is formed in the third boss, a buffering assembly connected with the third boss in a sliding mode is arranged in the groove, and the second boss can be clamped in the groove and abuts against the buffering assembly. By limiting the concave-convex block, eccentric wear of the contact position of the concave-convex block is avoided, and the abnormal knocking sound of the concave-convex block of the vehicle door when the vehicle passes through a bumpy road section is eliminated.

A rodless plunger drainage gas pump. The upper end of the upper pump barrel assembly of the present invention is fixedly connected to the center tube, and the inner hole of the center tube is connected to the inner channel in the gas pump; the annulus between the gas pump body and the outer pump barrel is the outer channel; the upper pump barrel assembly and the lower fixed assembly are axially fixed; during the operation of the gas pump, by alternately pressurizing the inner channel or the outer channel, the upper plunger of the movable assembly reciprocates along the upper pump barrel of the upper pump barrel assembly, and the lower pump barrel fixedly installed at the lower end of the upper plunger reciprocates along the lower plunger of the lower fixed assembly, so that the volume of the working chamber between the upper plunger and the lower plunger of the gas pump changes to complete the suction and discharge of liquid. Its beneficial effects are that the structural design is reasonable and can meet the mining needs of wells with different inclinations; no sucker rod is used to avoid the occurrence of eccentric wear of the sucker rod, effectively reduce the number of pump inspection operations, and reduce maintenance costs; it can effectively reduce the occurrence of sand jams and corrosion in the gas pump, extend the pump inspection cycle, and improve production efficiency.