Ball spline pair assembly

Abstract

The utility model provides a ball spline pair assembly. The ball spline pair assembly comprises a spline shaft, a nut, a retainer, a lining and a limiting structure. A ball groove is formed in the surface of the spline shaft, multiple sets of ball channels are arranged in the nut and divided into load channels and non-load channels, circulating rolling of balls is achieved, friction loss is reduced, and transmission efficiency is improved. Five groups of ball channels are arranged in the retainer, so that the bearing capacity and the rigidity are enhanced; the lining is located between the shell and the retainer and provides buffering and high-precision guiding. The limiting plate adopts a C-shaped buckle structure and is matched with annular grooves and pin holes in the two ends of the shell, so that stable assembly of the assembly is ensured. And the gasket is arranged between the C-shaped buckle and the lining, so that the sealing performance is improved, and pollution invasion is prevented. The assembly is compact in structure, stable in operation, high in bearing capacity and suitable for high-precision transmission occasions such as numerical control machine tools and industrial robots, and has good application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball spline pair subassembly technical field, in particular to a ball spline pair subassembly. BACKGROUND

[0002] In the field of mechanical transmission, spline pair subassembly is the key component to realize torque transmission and linear motion, and its performance directly affects the overall operation effect of the equipment. The traditional spline pair subassembly adopts sliding friction mode, and in the long-term operation process, due to the large friction between the relative sliding surfaces, not only the energy loss is serious, the transmission efficiency is low, but also the parts are prone to wear, reducing the service life of the equipment. Moreover, the traditional structure is prone to deformation, jamming and other problems when bearing large load, and it is difficult to meet the demand of modern industry for high-precision, high-load and high-efficiency transmission. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a ball spline pair subassembly, which solves the problem of low transmission efficiency in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides the following technical scheme:

[0005] A ball spline pair subassembly, comprising: a spline shaft, a plurality of bead grooves are formed on the surface of the spline shaft along the axial direction; a nut is sleeved on the spline shaft; the nut comprises a shell, a retainer, a plurality of ball channels are arranged in the retainer, a bushing is located between the shell and the retainer, a limiting plate is arranged at both ends of the shell and is used for limiting the retainer and the bushing in the shell; each ball channel has a load channel and a non-load channel which are interconnected, and the ball can reciprocate between the load channel and the non-load channel.

[0006] To achieve the above technical solution, the splined shaft surface has multiple ball grooves along the axial direction to guide the balls and bear the load. The housing is an integral support structure that houses the retainer and bushing. The retainer has multiple ball channels inside to arrange and guide the movement path of the balls. The bushing is located between the housing and the retainer, serving to buffer, dampen vibrations, and enhance guiding accuracy. Limiting plates are installed at both ends of the housing to prevent the retainer and bushing from shifting or falling off during operation. Each ball channel includes a load channel and a non-load channel. In the load channel, the balls contact the splined shaft surface and transmit the load, bearing the main torque and thrust. Simultaneously, in the non-load channel, the balls disengage from direct contact with the splined shaft and return to the starting point, preparing for the next load stroke. The balls roll under external force in the load channel, and after reaching the end, enter the non-load channel, where they are guided back to the starting point by the retainer, forming a complete cycle. Because the balls roll within both the load and non-load channels, the rolling friction coefficient is significantly reduced compared to traditional sliding friction. This greatly reduces energy loss during torque transmission and linear motion, thereby improving the overall transmission efficiency of the assembly.

[0007] In one embodiment of the present invention, the load channel has an opening corresponding to the bead groove, and the non-load channel is embedded in the inner wall of the retainer.

[0008] To achieve the above technical solution, the load channel is designed with openings corresponding to the ball grooves on the spline shaft. This means that when the nut moves along the spline shaft, the balls can precisely enter and roll along the ball grooves, thereby effectively transmitting torque or thrust. The non-load channel, integrated inside the retainer, helps save space and protects the balls from external interference or damage during their return. Furthermore, this design allows for more flexible adjustment of the ball circulation path, optimizing the overall structural layout.

[0009] In one embodiment of this utility model, the limiting plate is a C-shaped buckle, and the two ends of the C-shaped buckle are provided with pin holes for fastening with the housing.

[0010] To achieve the above technical solution, the limiting plate adopts a C-shaped buckle design. This design effectively confines the retainer and bushing within the housing, preventing axial or radial movement during operation. Pin holes are provided at both ends of the C-shaped buckle, allowing for the use of pins to securely fasten the C-shaped buckle to the housing.

[0011] In one embodiment of the present invention, both ends of the housing are provided with annular grooves for placing the C-shaped buckle.

[0012] To achieve the above technical solution, annular grooves specifically designed for accommodating C-shaped fasteners are incorporated at both ends of the housing. These annular grooves provide precise positioning guidance for the C-shaped fasteners and ensure their secure installation in the predetermined positions. This design guarantees a tight fit between the limiting plate and the housing, preventing any possible axial or radial movement.

[0013] In one embodiment of this utility model, a washer is provided between the C-shaped buckle and the bushing.

[0014] To achieve the above technical solution, the gasket can fill the tiny gap between the C-ring and the bushing, playing a certain sealing role, preventing dust, moisture and other contaminants from entering the internal structure, and protecting key components from the influence of the external environment.

[0015] In one embodiment of this utility model, the ball channels have five sets.

[0016] To achieve the above technical solution, the number of balls can be significantly increased by setting five sets of ball channels, thereby improving the load-bearing capacity and rigidity of the entire component. With more balls participating in force transmission simultaneously, the component can withstand greater axial and radial loads.

[0017] As described above, the ball spline assembly of this utility model has the following beneficial effects: The ball channels are divided into load channels and non-load channels. The balls contact the spline groove in the load channel and bear the main load; while in the non-load channel, they disengage and circulate back. This design ensures that the balls are always in a rolling state, significantly reducing the coefficient of friction, improving transmission efficiency, and reducing energy loss. Five sets of ball channels allow multiple balls to participate in load transmission simultaneously, improving the load-bearing capacity and structural rigidity of the assembly, making it suitable for heavy-duty applications. The non-load channels are embedded in the inner wall of the retainer, saving internal space, reducing overall size, and enhancing structural integration. The bushing, located between the housing and the retainer, not only serves as a guide but also provides shock absorption and buffering, effectively improving operational stability and guiding accuracy, and extending service life. A C-shaped buckle is used as a limiting plate, working in conjunction with an annular groove on the housing for positioning, ensuring that the retainer and bushing do not shift axially or radially within the housing, improving structural stability. Attached Figure Description

[0018] Figure 1 The diagram shown is a structural schematic of this utility model.

[0019] Figure 2 This is an exploded view of the nut.

[0020] Figure 3 This is a side view of the nut.

[0021] Figure 4This is a cross-sectional view of the nut without its housing.

[0022] Figure 5 The diagram shown is a structural schematic of the shell.

[0023] Component designation explanation

[0024] 1. Splined shaft ；1-1、 Zhugou ；2、 case ；3、 Retainer ；4、 Bushing; 5. Limiting plate ；6、 Load channel ；7、 Non-load channel ；8、 Opening ；9、 pin hole ；10、 Annular groove ；11、 washer. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Please see Figures 1 to 5 A novel ball spline assembly is provided, comprising: a spline shaft 1 with multiple ball grooves 1-1 axially formed on its surface; a nut sleeved on the spline shaft 1; the nut comprising: a housing 2; a retainer 3 having multiple sets of ball channels inside; a bushing 4 located between the housing 2 and the retainer 3; and a limiting plate 5 disposed at both ends of the housing 2 and used to limit the retainer 3 and the bushing 4 within the housing 2; each ball channel having an interconnected load channel 6 and a non-load channel 7, and the balls being able to circulate back and forth between the load channel 6 and the non-load channel 7.

[0027] The splined shaft 1 has multiple ball grooves 1-1 along its axial direction on its surface to guide the balls and bear the load. The housing 2 is an integral support structure that houses the retainer 3 and the bushing 4. The retainer 3 has multiple ball channels inside to arrange and guide the movement path of the balls. The bushing 4 is located between the housing 2 and the retainer 3, serving to buffer, dampen shocks, and enhance guiding accuracy. Limiting plates 5 are installed at both ends of the housing 2 to prevent the retainer 3 and bushing 4 from shifting or falling off during operation. Each ball channel includes a load channel 6 and a non-load channel 7. In the load channel 6, the balls contact the surface of the splined shaft 1 and transmit the load, bearing the main torque and thrust. At the same time, in the non-load channel 7, the balls disengage from direct contact with the splined shaft 1 and return to the starting point, preparing for the next load stroke. The balls roll under the action of external force in the load channel 6, and after reaching the end, they enter the non-load channel 7 and are guided back to the starting point by the retainer 3, forming a complete cycle path. Because the balls roll in the load channel 6 and the non-load channel 7, the rolling friction coefficient is significantly reduced compared to traditional sliding friction. This significantly reduces energy loss during torque transmission and linear motion, thereby improving the overall transmission efficiency of the component.

[0028] The load channel 6 has an opening corresponding to the bead groove 1-1, and the non-load channel 7 is embedded in the inner wall of the retainer 3.

[0029] The load channel 6 is designed with openings corresponding to the ball grooves 1-1 on the splined shaft 1. This means that when the nut moves along the splined shaft 1, the balls can precisely enter and roll along the ball grooves 1-1, thereby effectively transmitting torque or thrust. The non-load channel 7 is integrated inside the retainer 3, which helps save space and also protects the balls from external interference or damage during return. In addition, this design allows for more flexible adjustment of the ball circulation path and optimizes the overall structural layout.

[0030] The limiting plate 5 is a C-shaped buckle, and the two ends of the C-shaped buckle are provided with pin holes 8 for locking with the housing 2.

[0031] The limiting plate 5 adopts a C-shaped buckle design, which effectively confines the retainer 3 and bushing 4 within the housing 2, preventing them from moving axially or radially during operation. Pin holes 8 are provided at both ends of the C-shaped buckle, allowing the C-shaped buckle to be securely fixed to the housing 2 using pins.

[0032] Both ends of the housing 2 are provided with annular grooves 9 for placing the C-shaped buckles. These annular grooves 9 provide precise positioning guidance for the C-shaped buckles and ensure they are securely installed in the predetermined position. This design guarantees a tight fit between the limiting plate 5 and the housing 2, preventing any possible axial or radial movement.

[0033] A washer 10 is provided between the C-shaped buckle and the bushing 4. The washer 10 can fill the tiny gap between the C-shaped buckle and the bushing 4, playing a certain sealing role, preventing dust, moisture and other contaminants from entering the internal structure, and protecting key components from the influence of the external environment.

[0034] The ball bearing channel has five sets. By setting five sets of ball bearing channels, the number of balls can be significantly increased, thereby improving the load-bearing capacity and rigidity of the entire assembly. More balls participate in the transmission of force simultaneously, enabling the assembly to withstand greater axial and radial loads.

[0035] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A ball spline assembly, characterized in that, include: The splined shaft has multiple bead grooves on its surface along the axial direction. Nuts are fitted onto the splined shaft; The nut include, case; The retainer has multiple sets of ball channels inside; A bushing is located between the housing and the retainer; Limiting plates are disposed at both ends of the housing and are used to limit the retainer and bushing within the housing; each ball channel has an interconnected load channel and a non-load channel, and the balls can circulate back and forth between the load channel and the non-load channel.

2. The ball spline assembly according to claim 1, characterized in that: The load channel has an opening corresponding to the bead groove, and the non-load channel is embedded in the inner wall of the retainer.

3. The ball spline assembly according to claim 1, characterized in that: The limiting plate is a C-shaped buckle, and the two ends of the C-shaped buckle have pin holes for locking with the housing.

4. A ball spline assembly according to claim 3, characterized in that: Both ends of the housing are provided with annular grooves for placing the C-shaped buckle.

5. A ball spline assembly according to claim 4, characterized in that: A washer is provided between the C-shaped buckle and the bushing.

6. A ball spline assembly according to claim 1, characterized in that: The ball bearing channel has five sets.

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