451 results about "Balance shaft" patented technology

The plunger pump system with the cooling device comprises a plunger pump body and the cooling device, the plunger pump body comprises a plunger pump cylinder body, a plunger, a lining, a sealing assembly and a cooling flow channel, and the cooling flow channel is arranged in the plunger pump cylinder body; the cooling device comprises a liquid storage tank, a circulating pump and a heat exchanger; the circulating pump comprises a volute, an impeller and a rotating shaft; the impeller comprises a rear cover plate, a front cover plate, blades and a balance hole; the impeller is characterized in that a balance jet device is installed in the balance hole and used for enabling high-pressure liquid on the back pressure side of the impeller to flow back into the impeller cavity through the balance jet device, and the jet angle of the balance jet device can be adjusted. According to the circulating pump, the axial force can be balanced, and meanwhile, secondary flow and flow loss at the blade inlets can be reduced, so that the hydraulic performance and efficiency of the circulating pump can be improved, the plunger pump cylinder body can be efficiently cooled, the operation stability of the plunger pump is improved, and the service life of the plunger pump is prolonged.

The invention relates to an inside and outside automatic polishing machine tool for a bearing outer ring, which belongs to the technical field of polishing machine tools, and comprises a machine tool main body, and an inner ring polishing mechanism and an outer ring polishing mechanism for polishing the bearing outer ring are mounted on a bracket; the support is provided with a synchronous adjusting device used for synchronously adjusting the inner ring grinding mechanism and the outer ring grinding mechanism to be close to or away from the bearing outer ring. A clamp used for clamping the upper end and the lower end of a bearing outer ring is installed in the machine tool body. The single driving motor drives the inner ring grinding mechanism and the outer ring grinding mechanism to rotate, so that the inner ring grinding mechanism and the outer ring grinding mechanism grind the inner side and the outer side of a bearing outer ring, and simultaneous grinding can be achieved; the synchronous adjusting device drives the fine adjustment motor to drive the outer ring grinding wheel and the outer ring grinding wheel to be close to or away from the bearing outer ring at the same time, stress of the inner circumferential face and the outer circumferential face of the bearing outer ring can be effectively balanced, and therefore the bearing outer ring is prevented from deforming during grinding.

The invention relates to the technical field of multi-stage centrifugal pumps, and discloses an axial balance assembly which comprises a balance shaft sleeve, a pump shaft and a high-pressure throttling ring connected to a water inlet and outlet section, the balance shaft sleeve is connected to the pump shaft and arranged on the periphery of the pump shaft in a sleeving mode, and the high-pressure throttling ring is arranged on the periphery of the balance shaft sleeve in a sleeving mode. The high-pressure throttling ring and the periphery of the balance shaft sleeve are limited to form a flow blocking cavity, the flow blocking cavity is provided with a high-pressure flow blocking inlet and a high-pressure flow blocking outlet, the high-pressure flow blocking inlet and the high-pressure flow blocking outlet are oppositely arranged at the two ends of the flow blocking cavity in the axial direction of the balance shaft sleeve, and the high-pressure throttling ring is provided with a high-pressure ring end face. The balance shaft sleeve is provided with a high-pressure shaft end face, and the high-pressure choke flow inlet is located between the high-pressure ring end face and the high-pressure shaft end face. According to the axial balance assembly, generation of residual axial force from the high-pressure section to the low-pressure section is reduced, the service life of the water pump is prolonged, and the operation reliability of the water pump is improved.

The invention discloses a four-shaft balance transmission type cold pilger mill which comprises a main machine base, an input shaft, a first balance shaft, a crank shaft and a second balance shaft are sequentially installed at the top end of the main machine base, input gears are installed at the two ends of the input shaft, first balance gears are installed at the two ends of the first balance shaft, crank gears are installed at the two ends of the crank shaft, and second balance gears are installed at the two ends of the crank shaft. The two ends of the second balance shaft are provided with second balance gears, the input gear is connected with the first balance gear in a meshed mode, the crank gear is connected with the first balance gear in a meshed mode, and the second balance gears are connected with the crank gear in a meshed mode. The balance gear I and the balance gear II are adopted to realize balance, and during use, the rotation directions of the balance gear I and the balance gear II are opposite to those of a crankshaft gear, and the rotation torque of the gears is opposite to the inertia torque of a rack, so that interaction offset is performed, and higher-speed stable rolling is realized.

The utility model discloses a motorcycle engine crankshaft box body with an oil separation chamber, which comprises a crankshaft box body formed by connecting a left crankshaft box body and a right crankshaft box body, crankshaft mounting holes and balance shaft mounting holes are arranged on the left crankshaft box body and the right crankshaft box body, and the crankshaft mounting holes and the balance shaft mounting holes are distributed in a pairwise corresponding mode. An oil collecting chamber is arranged at the lower end in the crankcase body, and the balance shaft mounting hole is arranged close to the maximum oil liquid level position of the oil collecting chamber; the bottom of the oil collection chamber is provided with an oil separation chamber which is arranged close to the balance shaft mounting hole, the upper end of the oil separation chamber is close to the maximum oil liquid height of the oil collection chamber, and one side, far away from the balance shaft mounting hole, of the oil separation chamber is provided with an oil inlet hole; an engine oil filter screen is arranged in the oil separation cavity, and an oil guide channel with one end communicated with the oil separation cavity and the other end communicated with an oil inlet of the engine oil pump is arranged on the side of the oil separation cavity.

The embodiment of the utility model provides a motorcycle engine which comprises a crankshaft, the crankshaft comprises a main journal, a primary driving gear assembly, crank throws arranged on the two sides of the axis of the main journal, and crankshaft balance blocks arranged on the two sides of the crank throws; the number of the crankshaft balance blocks is six, and the two sides of each crank throw are each provided with one crankshaft balance block. The crankshaft balance blocks on the two sides of the crank throw corresponding to each air cylinder balance the reciprocating inertia force and the rotating inertia force of the connecting rod piston assemblies of the corresponding air cylinders and the crank throw respectively, and meanwhile, the crankshaft balance blocks are matched with the rotating inertia force of the balance shaft to achieve complete balance of each connecting rod piston assembly and the crank throw. The primary driving gear assembly is provided with a primary driving gear buffer mechanism; according to the engine, the problems of vibration and unstable power transmission are solved, the problem that power is not smooth or flameout occurs during low-load output of a high-gear engine is solved, and the driving comfort and the driving smoothness are improved.

The utility model provides a water outlet assembly of a leakage hole and a self-balancing multi-stage pump with the water outlet assembly, and the water outlet assembly based on the leakage hole is formed by a balance bushing (82), a balance shaft sleeve (83), a water outlet section (81), two water outlet leakage holes (811) located in the water outlet section (81) and a bushing leakage hole (821) located in the balance bushing (82). The balance shaft sleeve (83) is installed on a pump shaft (1) of the self-balance multistage pump, the balance bush (82) is fixed in an inner hole of the water outlet section (81) through a screw, the inner circle diameter of the balance bush (82) is larger than the outer circle diameter of the balance shaft sleeve (83), and a sealing gap between the balance bush (82) and the balance shaft sleeve (83) can isolate high-pressure cavities and low-pressure cavities on the two sides of the water outlet section (81). Meanwhile, by means of the flow discharging effect of the leakage hole of the water outlet assembly, the exciting force of sealing fluid in the sealing gap between the balance lining (82) and the balance shaft sleeve (83) can be reduced, and the overall stability of the self-balance multi-stage pump is improved.

The utility model discloses a cylinder block of a two-cylinder engine, comprising a cylinder body of a gantry-type structure, wherein the cylinder body is provided with two cylinder holes, wherein the axis of the cylinder holes and the axis of the crankshaft hole are not in the same plane, wherein a closed water jacket assembly is provided on the top of the cylinder body, wherein a plurality of water jackets in the closed water jacket assembly are arranged along the outer peripheral wall of the cylinder hole, wherein an inter-cylinder water hole connected with the water jacket is provided between the two cylinder holes, wherein the inter-cylinder water hole forms a V-shaped distribution with adjacent water jackets; wherein the cylinder body is provided with a balancing shaft mounting hole for mounting the balancing shaft; wherein the cylinder body is provided with a main oil circuit, a main oil supply oil circuit, and an auxiliary oil supply oil circuit, wherein the gantry-type cylinder body is adopted, and wherein the closed water jacket assembly and the balancing shaft mounting hole are provided on the top of the cylinder body, thereby greatly improving the structural strength of the top surface of the cylinder body, reducing the deformation of the cylinder hole, and significantly improving the NVH performance of the engine after assembling the balancing shaft.

The utility model provides a multi-stage sectional water pump, a split type balance disc is arranged at the rear end of a pump shaft, and the split type balance disc comprises a disc body, a balance shaft and a balance shaft, the balance bushing ring is located at the peripheral position of the disc body, a plurality of screw holes are formed in the disc body and the balance bushing ring, and the screw holes are used for fixing the disc body and the balance bushing ring through bolts; the balance spacer sleeve is arranged between the pump shaft and the balance sleeve, and the balance spacer sleeve extends in the axial direction; the disc body, the balance bushing ring and the balance spacer sleeve are of a split structure which can be detached from one another. According to the multi-stage sectional water pump, the balance disc is designed to be of a split structure, so that the balance disc is easier to replace, only one part of the balance disc needs to be replaced when the balance disc is replaced, and cost is greatly saved.

A rigidity-adjustable horizontal vibration isolator can solve the problems that the horizontal rigidity of an existing passive vibration isolator is not easy to adjust, the bearing range is limited, and the low-frequency vibration isolation effect is poor, and is characterized in that the rigidity-adjustable horizontal vibration isolator comprises a lower platform arranged for a bearing structure below a supporting base, and a load platform covers the upper portion of an upper platform of the bearing structure; four spherical hinges forming four vertexes of a square and vertically supporting the load platform are arranged on the lower platform at the two ends of the supporting seat in the x-axis direction, and a first horizontal spring for balancing displacement in the x-axis direction and a second horizontal spring for balancing displacement in the y-axis direction are arranged on the periphery of the upper end of each spherical hinge; one end of the first horizontal spring and one end of the second horizontal spring are hung on the load platform, and the other end of the first horizontal spring and the other end of the second horizontal spring are hung on the upper platform.

The utility model relates to the technical field of multi-stage pumps, in particular to an axial force balancing structure of a multi-stage pump, which comprises a balancing structure body, a last-stage impeller arranged on one side of the balancing structure body, a rotating shaft fixedly sleeved in the last-stage impeller, a bearing seat rotatably sleeved at one end of the rotating shaft, and a sealing piece mounted on one side of the bearing seat. A balance disc is arranged on one side of the sealing piece, a balance plate is installed on one side of the balance disc, a radial gap is formed in one side of the balance plate, and an axial gap is formed in the other side of the balance plate. The centrifugal pump has the advantages that liquid with pressure from the last-stage impeller flows into the water chamber between the balance plates through the radial gaps between the balance plates and the balance discs, so that the water chamber is in a high-pressure state, the balance pipe arranged on one side of the balance disc is connected with an inlet of the pump, the pressure of the balance pipe is approximate to the pressure of the inlet of the pump, and the pressures on the two sides of the balance disc are not equal; and through the matching of the radial clearance and the axial clearance, the axial force is balanced by means of the pressure difference generated by the radial clearance and the axial clearance on the leakage of water.

The utility model discloses a disc type shield pump which comprises a disc type motor, the disc type motor comprises a stator, a rotor and a shaft assembly. The pump shell is provided with a liquid inlet, a liquid outlet, a flow channel and a first bearing chamber; the pump body is connected to the pump shell, the pump body is provided with a first inner cavity and a second bearing chamber, the first inner cavity is aligned and communicated with the flow channel, a stator is arranged in the first inner cavity, and the second bearing chamber is communicated with the first inner cavity; the first bearing is arranged at the first bearing chamber; the second bearing is arranged at the second bearing chamber and is connected with the shaft assembly together with the first bearing; the impeller structure is arranged in the flow channel and the first inner cavity and connected with the shaft assembly, and the impeller structure is connected with the rotor; the shielding sleeve is arranged between the pump shell and the pump body and separates the stator from the pump body, and the pump body and the stator are not in contact with a medium; therefore, the technical problems that the sealing effect is poor, the heat dissipation effect is poor, the axial force is not eliminated or balanced, the structural reliability is poor, and the service life is shortened are solved.

The utility model belongs to the balance shaft detection technical field, and specifically discloses a balance shaft tooth angle detection tool comprising a base plate, a first fixing seat, a second fixing seat and a detection device, the first fixing seat and the second fixing seat are fixed on the base plate, and a balance shaft assembly is arranged between the first fixing seat and the second fixing seat; the balance shaft assembly comprises a shaft body and a detection annular protrusion arranged on the shaft body, a key groove is formed in the edge of the detection annular protrusion, and a detection block is connected to the key groove in a clamped mode. A transmission gear is further included, a positioning groove is formed in the transmission gear, and a positioning pin is arranged on the second fixing base. The included angle between the key groove and the positioning groove is fixed, two detection marking lines parallel to the shaft body are arranged on the detection block, and the detection device detects the installation angle deviation between the key groove and the positioning groove by measuring the height difference of the two detection marking lines. The device is simple in structure, convenient to detect, high in measurement precision, good in applicability and strong in practicability, and the working efficiency is greatly improved.

An internal combustion engine for a vehicle includes: a crankshaft; a balancer shaft that is connected to the crankshaft and is rotated by rotational power transmitted from the crankshaft; a crankcase including a crank chamber that accommodates the crankshaft and the balancer shaft; and a filler that fills a space around the balancer shaft in the crank chamber and is a member different from a wall surrounding the crank chamber.

The invention discloses a wear-resistant coating for an automobile balance shaft gear set and a preparation method thereof, and the wear-resistant coating comprises the following components by weight: 500-2000 parts of an organic solvent, 300-520 parts of polymer resin, 18-126 parts of a lubricating phase, 0-50 parts of a reinforcing phase, 15-60 parts of an auxiliary agent, and 1-4 parts of a pigment filler. The preparation method comprises the following steps: adding the modified lubricating phase into the organic solvent to prepare a mixed solution, adding the mixed solution and other components into a ball milling tank, and carrying out filtering and vacuum defoaming after ball milling to obtain the high-molecular wear-resistant coating. And spraying the wear-resistant coating on the gear, and carrying out third-order curing to obtain a gear product coated with the macromolecular wear-resistant coating. The wear-resistant coating prepared by the invention has excellent wear resistance and damping characteristic, can buffer the impact force of gear transmission, improves the knocking noise problem in the gear operation process, and improves the NVH performance of the whole gear.

A motorcycle (1000) comprises an engine (100), a frame (200), a walking system (300) and a suspension system (400), the engine (100) comprises a crankshaft (21), a balance shaft (22), an output gear (23), a balance gear (24), a main shaft (31), an auxiliary shaft (32), multiple sets of variable-speed driving gears (33) and multiple sets of variable-speed driven gears (34), and the output gear (23) is in meshing transmission with the balance gear (24) so as to drive the balance shaft (22) to rotate; a first plane (101) is determined by the axis of the main shaft (31) and the axis of the crankshaft (21), a second plane (102) is determined by the axis of the main shaft (31) and the axis of the auxiliary shaft (21), and an included angle theta of 0 degree lt is formed between the first plane (101) and the second plane (102); theta < lt >; and 180 degrees.

The invention discloses an assembling structure and method for a pure electric steering gear with double speed reducing mechanisms, and relates to the technical field of pure electric steering gear. According to the structure, a speed reducing shell and a motor controller are arranged on a steering gear shell, and a first-stage speed reducing mechanism composed of a small gear and a large gear is sequentially arranged in the speed reducing shell; one end of the worm is connected with the large gear through a transmission balance shaft, and a spring and a bearing are arranged in the transmission balance shaft to achieve radial elastic supporting and mechanical balance. The assembling method is carried out according to the sequence of the self-adaptive adjusting assembly, the worm, the transmission balance shaft, the speed reduction shell, the steering gear shell and the motor controller, and through a rotation test, the meshing clearance of the gear pair and the worm and gear pair is subjected to self-adaptive compensation by utilizing elastic deformation of a spring and a rubber element. Under the condition of a single motor, a large total transmission ratio and a large steering output torque are obtained, and meanwhile transmission stability, noise vibration performance and long-term use reliability are considered.

The invention belongs to the technical field of inertial navigation, and discloses a three-degree-of-freedom static balance device and method of a strapdown inertial measurement device. The three-degree-of-freedom static balance device of the strapdown inertial measurement device comprises a static balance frame, a double-shafting static balance device and a plurality of balance blocks, the double-shafting static balance device comprises a static balance frame and a static balance shaft, the static balance frame is used for installing the strapdown inertial measurement device, the static balance shaft is arranged on the static balance frame, and the balance blocks are arranged on the static balance frame. The static balance frame can be supported on the static balance frame through the static balance shaft, and the balance blocks are arranged on the static balance frame. According to the invention, the three-degree-of-freedom static balance of the strapdown inertial measurement device in the double-shafting static balance device can be realized by adjusting the positions of the plurality of balance blocks on the static balance frame and combining the conversion of the double shafting; and furthermore, the mass center deviation of the strapdown inertial measurement device generated by processing and assembling is corrected to the center of the mounting surface of the rubber shock absorber, so that the actual demand of the strapdown inertial measurement device on accurate mass leveling is met, and the assembling efficiency is favorably improved.

The heavy dumper frame comprises a left longitudinal beam, a right longitudinal beam, a first cross beam assembly, a second cross beam assembly, a third cross beam assembly, a middle cross beam assembly, a balance shaft cross beam assembly and a tail cross beam assembly, wherein the first cross beam assembly, the second cross beam assembly, the third cross beam assembly, the middle cross beam assembly, the balance shaft cross beam assembly and the tail cross beam assembly are sequentially installed between the left longitudinal beam and the right longitudinal beam from front to back. By optimizing the structure and layout of the cross beam, the overall strength of the frame and the stress bearing capacity of the tail are improved, and the problems that the frame is twisted under the full-load working condition of the dumper and the tail of the frame sinks and is twisted and deformed under the lifting working condition are solved; the dumper frame is of a variable-width structure, the width between the left longitudinal beam and the right longitudinal beam in the front of the frame is increased, and therefore the requirement for the installation space of a large-size engine can be met.

The utility model discloses a z-axis balancing device, which comprises a balancing support, a balancing shaft, a driving mechanism, a driving mechanism and a driving mechanism, and is characterized in that the balancing support comprises a top component; the balance air cylinder is connected with the Z shaft, and the flexible connecting piece is connected with the piston; the rigid connecting module is vertically arranged in the penetrating part, a gap is formed between the rigid connecting module and the penetrating part, the rigid connecting module is fixedly connected with the flexible connecting piece, the rigid connecting module comprises two locking sleeve pieces which are located at the top and the bottom of the top component respectively, each locking sleeve piece comprises an extending part, the extending part at the top is parallel to the top surface of the top component, and the locking sleeve pieces are connected with the flexible connecting piece; the extension part of the bottom is parallel to the bottom surface of the top component; the two buffering and damping modules are arranged between the top face of the top component and the extending part of the top and between the bottom face of the top component and the extending part of the bottom respectively. The Z-axis balancing device provided by the utility model is provided with the buffering and damping module, so that the vibration of the machine body is prevented from being transmitted to the Z-axis, and the influence of the vibration of the machine body on the Z-axis is reduced.

An automatic adjustable stroke device for a random orbital machine has a housing with a central axis and a wall defining a cavity. A counterbalance shaft assembly is rotatably disposed at least partially within the cavity. A shaft portion of the counterweight shaft assemblies aligned with the central axis. A mounting assembly is disposed at least partially within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjuster couples the counterweight shaft with the mounting assembly. The stroke adjuster enables the mounting assembly to adjust its stroke upon rotation of counterweight shaft. The mounting assembly variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing. The stroke adjuster has a gear automatically adjusting the mounting assembly stroke.

The present disclosure is directed generally to automated trailer door systems for use at vehicle loading docks. At least a portion of the trailer door system can be externally driven for opening and closing trailer doors at the loading dock. The automated trailer door system can include a counterbalance shaft that moves the trailer door between a closed position and an open position; and a drive unit having a torsion member operably coupled to the counterbalance shaft; and a drive member rotatably engaged with the torsion member, the drive member having an engagement portion accessible external to the trailer door. Rotation of the drive member via the engagement portion can rotate the torsion member to move the trailer door between the closed and open positions. A door winder can be coupled to a centering body and have a motor to rotate the drive member via the engagement portion.

The utility model discloses a pipeline support and a vehicle with the same, the pipeline support comprises a step part, the step part is constructed into a step shape and is provided with an upper step part, a side step part and a lower step part, the side step part is connected between the upper step part and the lower step part, the side step part, the upper step part and the lower step part form obtuse-angle bends, and the upper step part and the lower step part form obtuse-angle bends; the upper step part is suitable for being installed on a balance shaft cross beam, the side step part and the lower step part extend to the front side of the balance shaft cross beam, the lower step part is provided with a ribbon hole, and a ribbon can penetrate through the ribbon hole to bind a brake tube bundle; and the side extension part is connected to the side step part and extends forwards in the length direction of the frame longitudinal beam, and the side extension part is suitable for bundling the wire harness and guiding the wire harness to extend along the side extension part. The pipeline support has the advantages of reducing pipeline bundle abrasion, avoiding resonance, being good in safety and the like.

The utility model discloses sludge backfill agent stirring equipment, and relates to the technical field of sludge backfill agent production, in particular to the sludge backfill agent stirring equipment which comprises an inner stirring box, an outer balance box is fixedly sleeved outside the inner stirring box, an inner limiting wheel is movably sleeved on the inner side of the inner stirring box, and an outer balance box is fixedly sleeved on the inner side of the inner limiting wheel. The inner side of the outer balance box and the outer portion of the inner stirring box are movably sleeved with two outer limiting wheels, and stirring shafts are fixedly sleeved with the inner limiting wheels. According to the sludge backfill agent stirring equipment, the outer balance box fixedly sleeves the outer part of the inner stirring box, so that two stirring shafts are arranged in an inner cavity of the inner stirring box, two balance shafts are arranged in an inner cavity of the outer balance box, and the stirring shafts and the balance shafts are respectively connected by utilizing a long connecting rod and a short connecting rod; and meanwhile, the long connecting rod and the short connecting rod are in a vertical state, eccentric force generated in the rotating process can be balanced through a balancing weight outside the balance shaft in the rotating process, and the stability of equipment is effectively improved.

1. Name of the product in this design: Balance Shaft Housing. 2. Application of this design: Mining car parts. 3. The key point of the design of this product lies in its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to the technical field of machining and measurement, in particular to a balance shaft plane measuring tool which comprises a base, a positioning mechanism and a measuring mechanism. The measuring mechanism comprises a sliding block arranged on the front face of the base in a sliding mode and two symmetrical mounting rods fixedly arranged on the upper surface of the sliding block, dial indicators are rotationally arranged at the top ends of the two mounting rods through adjusting bolts, and probes are arranged at the measuring ends of the dial indicators. Through the arrangement of the positioning mechanism and the measuring mechanism, the balance shaft main body can be abutted and fixed, then the slide block is moved to enable a probe on the dial indicator to reach a specified detection position on the surface of the balance shaft main body, the dial indicator is subjected to zero comparison, finally, the slide block is moved to drive the dial indicator and the probe to move, and the reading change of the dial indicator is observed. Whether the balance shaft main body is qualified or not can be quickly judged by judging whether the reading change of the dial indicator is within a specified range or not, so that the tool has the advantages of low manufacturing cost and high measurement efficiency.

The invention relates to a balancing shaft, comprising:-an unbalanced shaft (1), which has a centre of gravity (9) spaced apart from the axis of rotation (8) thereof, which centre of gravity forms an unbalance plane (10) with the axis of rotation, and which has a bearing journal (6, 7), which has an only partially cylindrical circumference, the cylindrical partial circumference (11) of the bearing journal is oriented unbalanced towards the shaft,-a bearing ring (13) surrounding the bearing journal, which bears against the cylindrical partial circumference and defines a free space together with a bearing journal back (12) radially opposite the cylindrical partial circumference, and-a leaf spring (14), the leaf spring is tensioned in the free space on the one hand against the back of the bearing journal and on the other hand against the bearing ring, and the bearing ring is tensioned radially against the cylindrical partial circumference, characterized in that the leaf spring is tensioned against two bearing points (20, 21) of the back of the bearing journal, the two bearing points extend on both sides of the imbalance plane and the orthographic projections of the two bearing points on the imbalance plane extend on the same side of the axis of rotation with respect to the center of gravity.

The present invention discloses a method for analyzing and optimizing the gear knocking of an engine balance shaft system, comprising the following steps: studying the gear knocking vibration noise of the engine balance shaft system through a bench test; establishing a dynamic model of the engine balance shaft system; analyzing the dynamic characteristics of the gear knocking of the system; proposing a gear knocking evaluation index based on the moment of inertia in order to quantitatively evaluate the gear knocking intensity; using an orthogonal test method to study the factors affecting the gear knocking of the engine balance shaft system, and obtaining important parameters that have a significant impact on the gear knocking through range analysis; based on the selected important parameters, using a response surface method to optimize the gear knocking noise of the system. The method described in the present invention can analyze and optimize the gear knocking of an engine balance shaft system with scissor teeth, and provide a clear direction for reducing the gear knocking noise of the engine balance shaft system.

The utility model relates to the technical field of axles, and discloses a chassis axle for a heavy transport vehicle, which comprises a front bracket, a rear bracket and a rear bracket, the middle bracket is fixedly welded on the vehicle girder; the balance swing arm is connected with the middle support through a middle support pin shaft, and the middle support pin shaft and the middle support are fixedly arranged through a clamping groove; the wear-resistant sleeve and the balance swing arm are in tight fit and pressed-in arrangement, and the wear-resistant sleeve and the middle support pin shaft are in clearance fit, so that the middle support can swing left and right conveniently; a first shaft head and a second shaft head at the two ends of the balance shaft assembly are inserted into a cross-shaped cube respectively, and the cross-shaped cube is fixedly installed on the front support and the balance swing arm through a front support pin shaft. According to the axis bridge adopting the high-performance wear-resistant sleeve, when a vehicle runs, mutual swing contact abrasion is borne by the wear-resistant sleeve and the wear-resistant pad, contact abrasion between steel pieces is avoided, convenience is provided for after-sales maintenance, and the accessory replacement cost is saved.

The utility model discloses a kind of marine pump unit installation pedestals, belong to marine pump technical field, including base and the hydraulic vibration isolation mechanism of setting in the lower end surface of base, the hydraulic vibration isolation mechanism includes installation frame, vertically arranged support shaft is in the installation frame, hydraulic cylinder assembly is provided in the installation frame, the hydraulic cylinder assembly includes hydraulic cylinder, the upper end portion of support shaft is externally extended to the outside through installation frame, and is connected with base by connecting member, the lower end portion of connecting member is connected with the piston in the hydraulic cylinder through installation frame, and it provides the support force upwards for support shaft and connecting member;Bearing assembly for balancing axial force and radial force is provided in the installation frame of the lower end portion of support shaft.This utility model can effectively isolate vibration impact, reduce vibration transmission and the generation of noise, significantly reduce the mechanical stress of key equipment, wear and fatigue damage, prolong its service life.