33results about How to "Avoid scuffing" patented technology

The invention discloses a fuel gas concentration self-adaptive control method for a fuel gas generating set. The fuel gas concentration is the concentration of methane in fuel gas. The method comprises an open-loop fuel gas concentration self-learning starting control step carried out when the fuel gas generating set is not successfully started, wherein an engine ECU performs internal logic fuel gas concentration self-learning to reach the changed fuel gas concentration value, so that the set can be started smoothly; and the method further comprises a closed-loop fuel gas concentration self-learning control step, wherein the engine ECU continuously and finely adjusts the fuel gas methane concentration value repeatedly according to closed-loop data of an oxygen sensor, and finally performsaccurate self-learning to reach the changed fuel gas methane concentration value so that the fuel gas generating set can easily respond to the change of the concentration of the methane in the fuel gas. According to the method, the fuel gas generator set can accurately control the injection amount of a fuel gas valve and the air-fuel ratio better under the condition of fuel gas such as biogas, gasand biomass gas with the methane concentration variable, so that safe and stable operation is realized.

The invention relates to a cooling water jacket structure of a diesel engine cylinder body. A water inlet channel is disposed at the upper portion of the air inlet side of the cylinder body, a cylinder body water jacket is formed at the middle upper portion of each cylinder of the cylinder body, and the water inlet channel is communicated with the insides of the cylinder body water jackets through water inlet holes. The diesel engine cylinder body cooling water jacket structure is characterized in that the top ends of the cylinder body water jackets upwards extend to be provided with conical cooling water jackets, the conical cooling water jackets are located below cylinder jacket axial location ring support shoulders of cylinders of the cylinder body, the upper ends of the conical cooling water jackets are connected with the cylinder jacket axial location ring support shoulders, and the lower ends of the conical cooling water jackets are connected with water jacket inner cavity inclined planes of the cylinder body water jackets. The height of each conical cooling water jacket should ensure that when a piston is located at a top dead center, the upper ends of the conical cooling water jackets basically align to the top edge of a first piston ring on the piston. The cooling water jacket structure of the diesel engine cylinder body can ensure that when the piston is located at the compression top dead center, the piston, the piston ring and the cylinder jacket can all be cooled effectively, and scuffing of cylinder bore of the cylinder jacket can be prevented.

The invention relates to the technical field of automobiles, in particular to a method for preventing engine cylinder scoring. According to the method for preventing engine cylinder scoring, whether an engine fails or not is judged by measuring performance parameters of the engine; when it is judged that the engine fails according to the performance parameters of the engine, the output torque of the engine is limited first; and after the output torque of the engine is reduced, when the abnormal situation of the engine is still not improved or eliminated, the engine is directly turned off. According to the method, the situation that the gas inlet temperature, water temperature and lubrication situations of the engine become abnormal within a short period of time due to burst problems such as intercooler and throttle valve blockage, fan faults and engine oil leakage is considered, and it is effectively avoided that cylinder scoring happens when this type of situations happen to the engine.

The invention discloses a wear-resistant piston head used in the technical field of internal combustion engines. A pin shaft hole transversely penetrating the piston head is formed on the piston head, a plurality of piston ring grooves are formed above the pin shaft hole, a piston skirt part is arranged below the pin shaft hole, a radially raised step is arranged between the upper part of the pin shaft hole and the piston ring groove at the bottom, and the diameter at the step is equal to that of the piston skirt part. When the piston head is used, the inner diameter of the corresponding air cylinder is fitted with the diameter at the step, therefore, the diameter at the upper part of the piston is far smaller than the inner diameter of the air cylinder, the purposes of balancing the piston and adjusting the gap are achieved through a piston ring, simultaneously, the upper part of the piston is not in contact with the inner wall of the air cylinder during the working process, even if the operating conditions are bad and the piston is worn, the upper part of the piston can still keep a certain distance with the inner wall of the air cylinder to avoid the phenomenon of scuffing of cylinder bore and eccentric wear, and simultaneously, the piston head is not easily worn.

A watercraft hull and gunwale mooring guard for attachment to a mooring structure to prevent abrasion damage to the contact surfaces of a moored watercraft. The mooring guard includes a stationary vertical guide rod that is attached at one end to a mooring structure at an spaced horizontal distance therefrom and extends vertically upward above the mooring structure. A traveler member is slidable attached to the guide rod which when movement of the water causes the watercraft to move up and down, the traveler in contact with the watercraft will correspondingly move up and down and thus prevent hull and gunwale abrasion, scuffing and damage to the watercraft.

The invention discloses a hydraulic hammer cylinder part. The hydraulic hammer cylinder part comprises a cylinder body, a piston, a piston ring, sealing parts and a reversing valve. According to the hydraulic hammer cylinder part, a left side piston ring cylindrical section of a leftmost sealing part groove of a piston ring inner hole is lengthened by L1, meanwhile, an oil feeding groove is additionally formed in the lengthened part, and a gap sealing section D is formed on the left side of the oil feeding groove, or one or two sealing part grooves are additionally formed in the left side of the oil feeding groove; and in the working process, high-pressure oil is always introduced into the gap sealing section D or the added sealing part grooves, so that the sealing parts in the sealing part grooves are simultaneously subjected to axial compression force and radial compression force under the action of the high-pressure oil, the sealing parts in the grooves are more tightly matched witha to-be-sealed surface, the great supporting effect is achieved on a postmedian section in the piston, so that the severe loss caused by scoring of the piston and the inner hole due to contact of thepiston and the inner hole of the cylinder is effectively avoided.

The invention discloses an energy-saving and environmentally-friendly piston of an internal combustion engine. The piston is that a vertical groove which passes through the whole skirt part is axially formed in the surface of a piston skirt; lubricating oil and grinding chippings can be stored in the groove; lubricating oil can be fully supplied to the piston while moving in a cylinder sleeve by reciprocating, the lubricating oil can be uniformly distributed, so that the frictional heat can be dispersed, the lubricating effect can be improved, the frictional resistance can be reduced, the cylinder can be prevented from pulling and knocking, and as a result, the service lives of the piston and a cylinder can be prolonged; the groove and the piston move in the same direction; the piston skirt part is arranged by a passing manner, so that the piston can be uniformly stressed during moving; meanwhile, stress concentrated at an oil returning hole in a third ring groove of the piston can be unloaded through the groove, and thus the fatigue life of the piston can be prolonged.

The invention relates to an engine piston, in particular to an engine piston capable of saving energy and prolonging service life based on lubrication improvement, wear resistance and service life prolonging functions. A skirt portion of the piston is divided into a main stress bearing area and a secondary stress bearing area. Parallel vertical indent stripes are evenly distributed on the outer surface of the skirt portion of the piston at equal intervals. The vertical indent stripes comprise first vertical indent stripes and second vertical indent stripes, the first vertical indent stripes are located in the secondary stress bearing area and are of an equally-wide equally-deep groove structure, the second vertical indent stripes are located in the main stress bearing area and are of an equally-wide unequally-deep groove structure, the depths of the second vertical indent stripes are linearly and progressively decreased from the upper portion to the lower portion of the skirt portion of the piston, the vertical indent stripes can store lubrication oil and abrasive dust, lubrication oil can be sufficiently supplied when the piston does reciprocating motion in a cylinder sleeve, distribution is uniform, friction heat is dispersed, the lubrication effect is improved, friction resistance is reduced, piston scraping and piston slap are prevented, and the service life of the piston and the service life of an air cylinder are prolonged.

The invention belongs to the field of piston processing and relates to piston surface processing, in particular to a composite surface treatment piston and a preparation method thereof. The preparation method comprises two links namely printing an antifriction coating on the piston skirt and tinning the overall piston surface, the composite surface treatment method of printing the antifriction coating on the piston skirt and tinning the overall piston surface is adopted; printing a graphitic layer or a MoS2 layer on the piston skirt effectively prevents piston skirt friction, and tinning the overall piston surface effectively prevents friction between a piston ring groove and a piston ring and friction between a piston land and an air cylinder, so that the corrosion resistance and the anti-attrition lubricity of the piston are enhanced, the anti-seizure property of the air cylinder and the piston is greatly improved, early damage is prevented, the cylinder scoring phenomenon is avoided, a complete machine operates steadily, the failure rate is reduced, and the service life of the complete machine is prolonged.

The invention relates to an idling dormancy control method and system for an engine. The method comprises the steps that whether working signal input of the engine exists or not is detected; if working signal input is still not detected after the engine is successfully started and after a first preset period of time, the engine is controlled to enter a dormancy idling working condition; and otherwise, the engine is controlled to operate at a preset rotation speed according to the working signal input of the engine. By the adoption of the idling dormancy control method and system for the engine, whether the engine is under the working condition or not can be judged by judging whether working signal input exists or not, and accordingly whether an idling dormancy function is achieved or not is judged automatically; and the situation that the idling dormancy function is achieved only through triggering by pressing a switch manually is avoided, so that array position resources of a controller are saved, and an intelligent automatic triggering judgment mechanism is achieved.

The invention provides a hydraulic steel-ball locking device for an automobile chassis. The hydraulic steel-ball locking device comprises a piston cylinder with an oil filling hole, a piston, a steel ball, a plunger and a compression spring, wherein a groove is formed in the piston cylinder, the shape of the groove is matched with that of the steel ball, the piston is U-shaped and consists of a piston long segment, a piston short segment and a piston sealing face, a ball placement block is arranged on the piston short segment, the plunger is L-shaped and consists of a plunger long segment and a plunger short segment, the plunger short segment is in sliding connection with the piston long segment, the plunger long segment is in sliding connection with the piston cylinder, a curved face body is arranged on the plunger long segment, a curved face is 1-2cm higher than the ball placement block, one end of the compression spring is connected into the piston cylinder, the other end of the compression spring is connected into the plunger short segment, the elastic force of the compression spring is smaller than the frictional force between the piston and the piston cylinder, and a piston ring and an oil scraping ring are arranged on the piston. The hydraulic steel-ball locking device has the advantage that the problem of the existing locking mechanisms that the structure is complicated or the manufacturing cost is high is solved.

The invention discloses a piston, comprising a main body (1). The main body (1) is provided with a piston ring slot (2) and a skirt section (3), and oil return holes (5) are arranged in the main body (1). The piston is characterized in that the excircle surface of the skirt section (3) is provided with a labyrinth-shaped groove (4) so that the excircle surface of the skirt section (3) forms a plurality of curved surfaces. After the labyrinth-shaped slot is arranged on the excircle surface of the skirt section, when the piston and a cylinder sleeve rub mutually in the movement, a thicker layer of oil film is formed between base kinematic pairs so as to reduce the friction contact surface. The large-area mutual contact of slight convex bodies on metal surfaces can be avoided, and the functions of abrasion resistance and cylinder scraping prevention can be achieved in the maximum degree.

Embodiments of the present invention generally relate to an adaptable rack for aquatic transport of articles. More specifically, embodiments of the present invention relate to an adaptable rack for aquatic transport of articles to increase storage capacity of a boat and to prevent scuffing and damaging of the deck of the boat. In one embodiment of the present invention, an adaptable rack for aquatic transport of an article comprises a mounting post for fitting inside a rocket launcher on a boat, a support bar positioned on a top surface of the mounting post, and a plurality of support arms extending from the support bar, the support arms for supporting the article during aquatic transport.

The invention is suitable for the technical field of vehicle warm air control, and provides a control method of a vehicle warm air system and terminal device.The method comprises the steps that when it is detected that an engine is started and warm air is started, a warm air electromagnetic valve is controlled to be started, a warm air branch is controlled to be communicated, rapid warm-up is achieved, and fuel consumption is reduced; when it is detected that the engine is started and the warm air is not started, the temperature detected by the water temperature sensor is collected, and the on-off state of the warm air electromagnetic valve is controlled according to the temperature of the water temperature sensor and the preset temperature limit value of the water temperature sensor, so that cooling water in the engine of the vehicle is intelligently controlled to flow under different working conditions of the engine, and the cooling effect is improved. The engine can be quickly warmed or cooled, faults such as cylinder scoring or scrapping of the engine are prevented, the service life of the engine is prolonged, and user experience is improved.

The invention discloses an in-mold cutting injection mold. The in-mold cutting injection mold comprises an upper mold core and a lower mold core, and is characterized by further comprising a cutter, and the cutter comprises a cylindrical cutter body. The cylindrical cutter can directly form a product with a round hole while cutting off a water gap, the technological process of hole digging is omitted, meanwhile, the water gap can be completely hidden, and the appearance is more attractive.