Recently, the oil hydraulic system used in large and heavy equipment has been reinforced in restriction of performance, environment, and noise continuously. To solve these problems, research has been carried out in the size reduction of oil hydraulic systems, in high speed and pressure, electronic c...
Recently, the oil hydraulic system used in large and heavy equipment has been reinforced in restriction of performance, environment, and noise continuously. To solve these problems, research has been carried out in the size reduction of oil hydraulic systems, in high speed and pressure, electronic control, substitute oil, noise decrease, and etc. The bent-axis type oil hydraulic piston pump acting as the core power source in the oil hydraulic system is no exception to this technique tendency. It is used as the main pumps in heavy construction equipment because it offers high speed and pressure, high total efficiency and distinguished variable delivery. In the bent-axis type axial piston pump, since the cylinder block in the rotary part is driven by the tapered piston connected to the disk of the shaft, the geometrical mechanism of this type of pump is very complicated and difficult to analyze. Also, the related researches in this field are extremely limited. Therefore, the driving mechanism of the bent-axis type piston pump driven by the piston rod is the focus of this paper. The piston pump works in the way that a piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very important design factors. If the above design factors do not satisfy the optimized conditions, the friction loss between the cylinder bore and the piston rod would increase, and the pump could even fail to run in conditions with severe friction and wear. When the piston rod reciprocates in the cylinder bore with high velocity, it rotates on its own axis and revolves about the center line of the cylinder block. And the driving force produced in the contacted part between the tapered piston rod and the inner surface of the cylinder bore drives the cylinder block simultaneously. Because of all those complicated modes of motion, it is not easy to analyze the pump’s driving mechanisms. Moreover, in the manufacturing processes of the disk, the cylinder block and the piston, the tolerances related to the design drawing and the implements take place. Accordingly, considering these tolerances, the driving mechanism becomes very complicated and it is almost impossible to analyze. In this paper, the driving characteristic according to the changes of the position tolerance of the disk’s spherical part, which undergoes the difficulty of the tolerance management in oil hydraulic maker, is determined. Therefore, in this paper, the driving mechanism of the piston rod in the bent-axis type piston pump driven by the piston rod has been analyzed. Then, when the center of the disk is eccentric, the theoretical and the experimental analyses about the influences of eccentric parameters on the delay angle of the piston rod and the driving ranges of the piston are carried out.
Recently, the oil hydraulic system used in large and heavy equipment has been reinforced in restriction of performance, environment, and noise continuously. To solve these problems, research has been carried out in the size reduction of oil hydraulic systems, in high speed and pressure, electronic control, substitute oil, noise decrease, and etc. The bent-axis type oil hydraulic piston pump acting as the core power source in the oil hydraulic system is no exception to this technique tendency. It is used as the main pumps in heavy construction equipment because it offers high speed and pressure, high total efficiency and distinguished variable delivery. In the bent-axis type axial piston pump, since the cylinder block in the rotary part is driven by the tapered piston connected to the disk of the shaft, the geometrical mechanism of this type of pump is very complicated and difficult to analyze. Also, the related researches in this field are extremely limited. Therefore, the driving mechanism of the bent-axis type piston pump driven by the piston rod is the focus of this paper. The piston pump works in the way that a piston rod drives the cylinder block, so the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are very important design factors. If the above design factors do not satisfy the optimized conditions, the friction loss between the cylinder bore and the piston rod would increase, and the pump could even fail to run in conditions with severe friction and wear. When the piston rod reciprocates in the cylinder bore with high velocity, it rotates on its own axis and revolves about the center line of the cylinder block. And the driving force produced in the contacted part between the tapered piston rod and the inner surface of the cylinder bore drives the cylinder block simultaneously. Because of all those complicated modes of motion, it is not easy to analyze the pump’s driving mechanisms. Moreover, in the manufacturing processes of the disk, the cylinder block and the piston, the tolerances related to the design drawing and the implements take place. Accordingly, considering these tolerances, the driving mechanism becomes very complicated and it is almost impossible to analyze. In this paper, the driving characteristic according to the changes of the position tolerance of the disk’s spherical part, which undergoes the difficulty of the tolerance management in oil hydraulic maker, is determined. Therefore, in this paper, the driving mechanism of the piston rod in the bent-axis type piston pump driven by the piston rod has been analyzed. Then, when the center of the disk is eccentric, the theoretical and the experimental analyses about the influences of eccentric parameters on the delay angle of the piston rod and the driving ranges of the piston are carried out.
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