End face tooth part matching structure

Abstract

The utility model provides an end face tooth portion matching structure which comprises a hub bearing and a fixed knot, the fixed knot comprises a bell-shaped shell, a retainer, a steel ball and a star-shaped sleeve, an end face tooth portion is arranged on the end face portion of the left side of the bell-shaped shell, the hub bearing is also provided with an end face tooth portion, and the end face tooth portion and the hub bearing are meshed with each other. At least one adjacent tooth root construction line intersects at one point C on the axis, but the tooth crest construction lines do not intersect at the same point, so that the tooth thickness at the small-diameter position can be adjusted, the tooth thickness can be adjusted, and the wheel can be driven to run. The tooth thickness at the small-diameter position is larger than that of a conventional end face tooth, and the strength of the tooth at the small-diameter position is enhanced. Similarly, the tooth thickness at the small-diameter position can be adjusted to be smaller, and matching with end face teeth of end face gear hub bearings of other manufacturers is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to an end face tooth part matching structure. Background Art

[0002] In order to adapt to the trends of lightweight, high NVH requirements, and large torque in electric vehicles, a new type of end face tooth matching structure is proposed to transmit torque.

[0003] The interface for connecting the hub end of the traditional drive half shaft adopts the form of external spline and thread, that is, the fixed joint interface of the half shaft adopts external spline + thread, and the hub end corresponds to an internal spline. After the two are assembled, they are tightened with a nut. The spline is generally an involute spline. This solution has been widely used, but it has certain defects.

[0004] 1. Vehicles with different torque requirements need to design splines with different sizes and parameters, which leads to the diversity of spline sizes.

[0005] 2. For the machining of the external spline of the fixed joint of the existing product, it is necessary to machine the rod part after forging, cold roll the spline, and perform quenching and tempering on the rod part, and the manufacturing process is more complex.

[0006] 3. Due to the existence of a certain length of spline and thread in the fixed joint of the existing product, the rod part is long and the overall weight is heavy, which is not conducive to lightweight. At the same time, the higher the torque requirement, the larger the spline and the greater the weight.

[0007] 4. Since the existing fixed joint and hub transmit torque through the cooperation of internal and external splines, and in the context of large torque and fast instantaneous torque increase in electric vehicles, after a certain mileage, the spline cooperation is likely to produce gaps, and NVH problems such as abnormal noise during vehicle start and acceleration are likely to occur. Summary of the Utility Model

[0008] Embodiments of the present application are proposed to make up for the deficiencies of the existing technology and provide an end face tooth part matching structure to solve the problems existing in the existing technology.

[0009] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0010] An end face tooth part matching structure includes a hub bearing and a fixed joint. The fixed joint includes a bell housing, a cage, steel balls and a spider. An end face tooth part is provided at the left end face of the bell housing. There is also an end face tooth part on the hub bearing. The two are meshed with each other. Torque is transmitted from the half shaft to the hub bearing and then drives the wheel to run. And bolts pass through the hub bearing and are meshed with the internal threads of the bell housing. The end face tooth part includes a plurality of teeth. Each tooth includes a tooth top and a tooth root. The construction lines of the adjacent end face tooth roots intersect at the axis of the bell housing. The construction line of the tooth top sandwiched between the two tooth root construction lines passes through the axis of the bell housing but does not intersect the tooth root construction line on the axis.

[0011] As a further technical solution of the present invention: each tooth of the end face tooth portion is circumferentially and uniformly arranged on the end face of the bell-shaped housing.

[0012] As a further technical solution of the present invention: between each adjacent tooth is a tooth groove. Looking from the radial direction, the tooth thickness of a single end face tooth decreases as the radial diameter becomes smaller, and the width of the middle tooth groove has the same trend.

[0013] As a further technical solution of the present invention: the pressure angle of a single tooth is non-constant in the entire tooth length direction, and its variation range is 20° - 35°.

[0014] As a further technical solution of the present invention: the tooth tip and the tooth root are in a rounded corner shape or a flat shape.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] At least one adjacent tooth root construction line of the present utility model intersects at a point C on the axis, but the tooth tip construction lines do not intersect at the same point. This is beneficial for adjusting the tooth thickness at the small diameter, making the tooth thickness at the small diameter greater than that of a conventional end face tooth, and enhancing the strength of the tooth at the small diameter. Similarly, the tooth thickness at the small diameter can also be adjusted to facilitate the matching with the end face teeth of the end face gear hub bearings of other manufacturers. Description of the Drawings

[0017] Figure 1 It is the overall structure and sectional view of the present invention.

[0018] Figure 2 It is the sectional view of the tooth surface at the large diameter.

[0019] Figure 3 It is the sectional view of the tooth surface at the small diameter.

[0020] Figure 4 It is the schematic diagram of the tooth root construction line and the tooth tip construction line.

[0021] In the figure: 1 - bell-shaped housing, 2 - cage, 3 - steel ball, 4 - star-shaped sleeve, 5 - cross-section tooth portion, 51 - tooth tip, 52 - tooth root, 511 - tooth tip construction line, 521 - tooth root construction line, 53 - internal thread. Detailed Embodiment

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] Reference Figures 1-4 , an end face tooth part matching structure, including a hub bearing and a fixed joint. The fixed joint includes a bell housing 1, a cage 2, steel balls 3 and a star sleeve 4. An end face tooth part 5 is provided at the left end face part of the bell housing 1. There is also an end face tooth part on the hub bearing, and the two are meshed with each other. Torque is transmitted from the half shaft to the hub bearing and then drives the wheel to run. And bolts pass through the internal threads of the hub bearing and the bell housing to be meshed to prevent the two components from axially disengaging. From Figure 1 It can be seen that each end face tooth of the end face tooth part is circumferentially and evenly arranged on the end face of the bell housing 1. There is a tooth groove in the middle of each end face tooth. Looking from the radial direction, the tooth thickness of a single end face tooth decreases as the radial diameter becomes smaller. Similarly, the width of the middle tooth groove has the same trend.

[0024] As Figure 1 shown, the tooth root construction line 512 is the intersection line of the tooth surfaces on both sides of the tooth groove. Similarly, the tooth top construction line 511 is the intersection line of the tooth surfaces on both sides of the tooth thickness. Both are virtual lines. On the entire tooth surface, the extension lines of at least 1 adjacent tooth root construction lines 521 intersect at a point C, and the point C is on the axis of the bell housing 1. At the same time, the extension line of the tooth top construction line 511 in the middle of the two tooth root construction lines 521 passes through the bell housing 1 axially but does not intersect at the point C.

[0025] Figure 2 , the C-C diagram is a cross-sectional view of the tooth surface at the large diameter. The included angle between the tooth surface lines on both sides of the tooth groove and the middle plane in this cross-sectional view is the pressure angle α. Similarly, the included angle values between the tooth surface lines on both sides of the tooth thickness and the middle plane at the same cross-section are the same, both being the pressure angle α. The tooth root and tooth top in the figure are rounded corners and can also be planes, and it is necessary to ensure that the tooth root and tooth top do not interfere when meshing. The virtual tooth root construction point and tooth top construction point are the intersection points of the tooth surface lines on both sides. In the right figure above, the A-A diagram is a cross-sectional view of the tooth surface at the small diameter, and the pressure angle is α2. Looking from the radial direction, the pressure angle of a single tooth changes within a certain range, that is, the pressure angles α and α2 are not equal. As the diameter becomes smaller, the pressure angle of a single tooth can increase or decrease accordingly, and the change range is 20° to 35°, preferably 25° to 30°. The reason for the above phenomenon is shown in Figure 4 .

[0026] For conventional end face teeth, the tooth root construction line and the tooth top construction line intersect at a point on the axis, so the pressure angles of different cross-sections are equal. However, at least one adjacent tooth root construction line of the present invention intersects at a point C on the axis, but the tooth top construction line does not intersect at the same point. This is beneficial to adjusting the tooth thickness at the small diameter, making the tooth thickness at the small diameter greater than that of conventional end face teeth and enhancing the strength of the teeth at the small diameter. Similarly, the tooth thickness at the small diameter can also be adjusted to facilitate the matching with the end face teeth of the hub bearings of end face gears from other manufacturers, because if the tooth thickness is too large, it may not be able to match the tooth grooves of the opposing parts.

[0027] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model.

[0028] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easily understood by those skilled in the art.

Claims

1. An end face tooth part matching structure, comprising a hub bearing and a fixed joint, characterized in that: The fixed section includes a bell housing, a cage, steel balls and a star sleeve. The left end face of the bell housing is provided with an end face tooth part, and the hub bearing also has an end face tooth part. The two are meshed with each other, and the torque is transmitted from the half shaft to the hub bearing to drive the wheel to run. There is also a bolt passing through the hub bearing and meshing with the internal thread of the bell housing. The end face tooth part includes a plurality of teeth, and each tooth includes a tooth tip and a tooth root. The construction lines of the roots of adjacent end face teeth intersect at the axis of the bell housing. The construction line of the tooth tip sandwiched between the two root construction lines passes through the axis of the bell housing but does not intersect the root construction line at the axis.

2. The mating structure of the end face tooth part according to claim 1, characterized in that Each tooth of the end face tooth part is circumferentially and evenly arranged on the end face of the bell housing.

3. The end face tooth part matching structure according to claim 1, characterized in that, There is a tooth groove between each adjacent tooth. Looking radially, the tooth thickness of a single end face tooth decreases as the radial diameter decreases, and the width of the middle tooth groove has the same trend.

4. A mating structure for end face teeth according to claim 1, characterized in that, The pressure angle of a single tooth is non-constant in the entire tooth length direction, and its change range is 20°-35°.

5. A mating structure for end face teeth according to claim 1, characterized in that, The tooth tip and the tooth root are in a rounded corner shape or a flat shape.

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