Combined lead screw pair

Abstract

A combined lead screw pair is characterized in that the combined lead screw pair is formed by coaxially connecting two to six nuts, a rolling nut, a nut of a ball screw, a pin roller of a planetary pin roller screw and a nut in series and meshing the nuts with the pin roller and the nut, and all the nuts, the rolling nut, the nut of the ball screw, the pin roller of the planetary pin roller screw and the nut which are coaxially connected in series are called combined nuts. A spring is arranged on part or all of the combined nut to limit the axial thrust borne by the combined nut, so that the nut only bears part of the preset axial thrust of the combined screw rod pair; the axial thrust can also be transmitted to a component for installing the combined nut by each nut or the nut and the spring thereof.

Description

Technical Field

[0001] The utility model belongs to a mechanical part of a spiral transmission, in particular to a screw rod pair and a combined screw rod pair. Background Art

[0002] Various existing screw pairs include ball screws and roller screws. When the bearing capacity of the screw pair is small and the installation space is limited, it is difficult to choose a suitable model. Summary of the invention

[0003] The problem to be solved by the utility model is to provide a combined screw pair, which can increase the bearing capacity of the combined screw pair without increasing the nominal size of the screw pair when the bearing capacity of the screw pair is small and the installation space is limited.

[0004] In order to achieve the above-mentioned purpose, a combined screw pair is provided, characterized in that: the combined screw pair is composed of 2 to 6 nuts, rolling nuts, nuts of ball screws, rollers of planetary roller screws and nuts coaxially connected in series and meshed with the screw, all the coaxially connected nuts, rolling nuts, nuts of ball screws, rollers and nuts of planetary roller screws are called combined nuts, some or all of the nuts of the combined nuts are provided with springs to limit the axial thrust they are subjected to, and become nuts that only bear part of the preset axial thrust of the combined screw pair; the axial thrust can also be transmitted to the component for installing the combined nut by each nut or the nut and its spring respectively.

[0005] The described combined screw rod pair is characterized in that when the combined nut is composed of a rolling nut, a spring can be arranged at the axial end of each peripheral screw rod.

[0006] Over the meshing length of the screw and the nut, the force on each tooth is uneven, and the number of turns of teeth used for strength calculation is limited. If some or all of the nuts of the combination nut are equipped with springs to limit the axial thrust they receive, the number of turns of teeth used for calculation can be increased, thereby increasing the impact resistance of the combination screw pair.

[0007] The utility model has the beneficial effect that when the bearing capacity of the screw pair is small and the installation space is limited, the bearing capacity of the combined screw pair is increased without increasing the nominal size of the screw pair, and is also suitable for equipment with impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of Embodiment 1 of the present utility model;

[0009] Figure 2 This is a schematic diagram of Embodiment 2 of the present utility model;

[0010] Figure 3 This is a schematic diagram of Embodiment 3 of the present utility model;

[0011] In the figure, 1 is a rolling nut, 2 is a disc spring, 3 is a pressure cover, 4 is a clamp, 5 is a frame, 6 is an upper bearing seat of a peripheral screw, 7 is a radial rolling bearing of a peripheral screw, 8 is a peripheral screw, 9 is a thrust rolling bearing of a peripheral screw, 10 is a lower bearing seat of a peripheral screw, and 11 is a center screw. DETAILED DESCRIPTION

[0012] Embodiment 1:

[0013] Figure 1 The invention relates to a combined screw rod pair composed of two rolling nuts (1). A butterfly spring (2) is arranged between the bearing seats of the two rolling nuts (1) to limit the axial thrust received by one of the rolling nuts (1), so that the rolling nut only receives a part of the preset axial thrust of the rolling screw rod pair. The length of the rolling nut to which the axial thrust is limited is determined according to the magnitude of the axial thrust.

[0014] Over the meshing length of the screw rod and the nut, the force on each tooth is uneven, and the number of tooth circles used for strength calculation is limited. Some or all of the nuts of the combination nut are equipped with springs to limit the axial thrust, which can increase the flexibility of the nut and increase the number of tooth circles used for calculation. It is used when the load of a single nut is insufficient, and can also be used for equipment with impact force.

[0015] Embodiment 2:

[0016] The axial thrust may also be transmitted to the mounting nut by each nut or the nut and its spring, respectively.

[0017] Figure 2 An upper rolling nut (1) and a lower rolling nut (1) and a disc spring (2) thereof are installed on a frame (5); an axial thrust is transmitted to the frame (5) on which the rolling nuts are installed by the upper rolling nut (1) and the lower rolling nut (1) and the disc spring (2) respectively; a clamp (4) on the frame (5) bears the axial thrust of the lower rolling nut (1) and the disc spring (2); a pressure cover (3) can adjust the tension of the disc spring (2); the load-bearing capacity of the combined screw pair is increased without increasing the nominal size of the screw pair, and the impact resistance of the equipment is increased.

[0018] Rolling nuts can be other types of nuts, and ordinary nuts need to adjust or coordinate the pitch between nuts.

[0019] Embodiment 3:

[0020] Figure 3 yes Figure 1An enlarged view of the rolling nut (1) of the middle part, wherein (6) is the upper bearing seat of the peripheral screw, (7) is the radial rolling bearing of the peripheral screw, (8) is the peripheral screw, (9) is the thrust rolling bearing of the peripheral screw, (10) is the lower bearing seat of the peripheral screw, and (11) is the center screw. Parts (6), (10) and six groups of parts (7), (8), and (9) constitute the rolling nut (1), which is meshed with the center screw (11); Figure 1 The difference between the middle component rolling nut (1) and the middle component rolling nut (1) is that the butterfly spring (2) is arranged on the axial end of the peripheral screw rod (8), so that the rolling nut (1) becomes a nut that only bears a part of the preset axial thrust of the combined screw rod pair.

Claims

1. A combined screw rod, characterized in that: The screw pair is composed of 2 to 6 nuts, rolling nuts, nuts of ball screws, rollers of planetary roller screws and nuts coaxially connected in series and meshed with the screw. All the coaxially connected nuts, rolling nuts, nuts of ball screws, rollers of planetary roller screws and nuts are called combination nuts. Some or all of the nuts of the combination nut are provided with springs to limit the axial thrust they are subjected to, so that they become nuts that only bear part of the preset axial thrust of the combination screw pair; the axial thrust can also be transmitted to the component to which the combination nut is installed by each nut or the nut and its spring respectively.

2. The combined screw pair according to claim 1, characterized in that: When the combined nut is composed of a rolling nut, a spring may be arranged at the axial end of each peripheral screw rod.

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