Hub built-in type constant velocity apparatus

Abstract

The hub-integrated constant velocity joint according to the present invention may include a hub housing comprising: a central portion to which a bearing assembly is coupled; a flange portion formed on one side of the central portion to which a wheel is coupled; and an inner race portion formed on the other side of the central portion and having a groove formed on its outer surface to which a constant velocity joint ball is seated.

Description

Technology Field

[0001] The present invention relates to a hub-integrated constant velocity joint, and more specifically, to a hub-integrated constant velocity joint in which the inner race of the hub housing and the constant velocity joint are integrated. Background Technology

[0003] Generally, hubs and bearings are installed on tire wheels connected to the drive axle and are used to withstand vertical and longitudinal loads, as well as horizontal loads when the vehicle turns. Additionally, constant velocity joints are installed on the vehicle's drive axle and are used to transmit power from the transmission to the wheels. Furthermore, it is common for the constant velocity joint, hub, and bearing to be organically assembled by fastening members to function as a single unit.

[0004] Meanwhile, the constant velocity joint is a component that performs the function of transmitting the driving force of the engine (motor) to the wheel, and the constant velocity joint and the wheel-side hub bearing are connected by splines. However, conventionally, problems such as noise, backlash, and nut loosening occurred during power transmission at the connection point between the constant velocity joint and the hub bearing.

[0005] The matters described above as background technology are intended only to enhance understanding of the background of the present invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. Prior art literature

[0007] KR 10-1871992 The problem to be solved

[0008] The present invention, proposed to solve the aforementioned problem, aims to provide a hub-integrated constant velocity joint that can improve quality issues between boundary parts, reduce weight, and enhance driving performance by integrating the hub housing and the inner race of the constant velocity joint. means of solving the problem

[0010] A hub-integrated constant velocity joint according to the present invention for achieving the above-mentioned purpose may include a hub housing comprising: a central portion to which a bearing assembly is coupled; a flange portion formed on one side of the central portion to which a wheel is coupled; and an inner race portion formed on the other side of the central portion and having a groove formed on its outer surface to which a constant velocity joint ball is seated.

[0011] It may include an inner ring coupled to a part of the outer surface of the central part; an outer ring spaced a certain distance from the hub housing and the inner ring; and a rolling element provided between the hub housing and the outer ring and between the inner ring and the outer ring.

[0012] It may further include a preload ring that is coupled to the outer surface of the central part and located on the other side of the inner ring.

[0013] It may further include a boot, one side of which is coupled to the outer surface of the preload ring and the other side of which is coupled to the outer surface of the constant velocity joint.

[0014] A coupling structure can be formed on the outer surface of the preload ring and the inner surface of the boot coupled to the preload ring, and on the outer surface of the constant velocity joint and the inner surface of the boot coupled to the outer surface of the constant velocity joint.

[0015] Multiple pairs of grooves facing each other are formed in the inner lace section, and

[0016] The diameter of the inner lace section may be the distance between the lowest ends of a pair of opposing grooves.

[0017] The electric body is,

[0018] It may include a first rolling element disposed between the outer surface of the central portion and the outer ring of the bearing; and a second rolling element disposed between the outer ring of the bearing and the inner ring of the bearing.

[0019] It may further include a first sealing member located on one side of the first rolling element and provided on the outer ring of the bearing and the outer surface of the central part; and a second sealing member located on the other side of the second rolling element and provided between the outer ring of the bearing and the inner ring of the bearing.

[0020] It may further include a stopper ring provided on the inner side of the housing of the constant velocity joint and preventing the constant velocity joint ball from coming loose. Effects of the invention

[0022] According to the present invention, by integrating the inner race of the hub housing and the constant velocity joint, the noise problem that occurred between boundary parts during forward / reverse movement can be improved, the problem of hub nut loosening can be improved, and the number of parts can be reduced to reduce weight and improve driving fuel efficiency.

[0023] In addition, stiffness can be improved by increasing the minimum diameter of the constant velocity joint.

[0024] In addition, by reducing the diameter of the sealing member, the frictional force of the boot during rotation can be reduced and the drag torque can be reduced.

[0025] Furthermore, by minimizing the external surface area of ​​the boot, damage caused by dust impact can be prevented. Brief explanation of the drawing

[0027] Figure 1 is a drawing showing the overall configuration of a conventional constant velocity joint. FIG. 2 is a drawing showing the overall configuration of a hub-integrated constant velocity joint according to an embodiment of the present invention. FIG. 3 is a drawing showing a hub housing, a bearing inner ring, and a preload ring of a hub-integrated constant velocity joint according to an embodiment of the present invention. FIG. 4 is a drawing showing a stopper ring of a hub-integrated constant velocity joint according to an embodiment of the present invention. FIG. 5 is a drawing for explaining a hub-integrated constant velocity joint according to another embodiment of the present invention. Specific details for implementing the invention

[0028] Hereinafter, a hub-integrated constant velocity joint according to a preferred embodiment of the present invention will be examined with reference to the attached drawings.

[0029] FIG. 2 is a drawing showing the overall configuration of a hub-integrated constant velocity joint according to an embodiment of the present invention, FIG. 3 is a drawing showing the hub housing, bearing inner ring, and preload ring of a hub-integrated constant velocity joint according to an embodiment of the present invention, and FIG. 4 is a drawing showing the stopper ring of a hub-integrated constant velocity joint according to an embodiment of the present invention.

[0030] As illustrated in FIG. 2, a hub-integrated constant velocity joint according to one embodiment of the present invention may include one or more of a hub housing (100), an inner ring (210), an outer ring (220), a rolling element (230), a preload ring (300), a constant velocity joint (800), a first sealing member (500), a second sealing member (600), and a stopper ring (700).

[0031] The hub housing (100) may include a central portion (110) to which a bearing is coupled, a flange portion (120) formed on one side of the central portion (110) to which a wheel is coupled, and an inner race portion (130) formed on the other side of the central portion (110) and having a groove formed on its outer surface to which a constant velocity joint ball is seated.

[0032] The flange portion (120) serves as an assembly guide for the wheel and the disc and maintains the center position of the rotating body, and the inner race portion (130) serves as the inner race of the constant velocity joint.

[0033] Additionally, as shown in FIG. 3, a plurality of pairs of grooves facing each other are formed in the inner lace portion (130), and the diameter of the inner lace portion (130) may be the distance between the lowest ends of the pairs of grooves facing each other.

[0034] Meanwhile, referring to FIGS. 1 and 2, in a conventional constant velocity joint, the minimum diameter was the neck portion of the constant velocity joint (part marked A in FIG. 1), but in a constant velocity joint according to an embodiment of the present invention, the minimum diameter is the diameter of the inner race portion (130), and it can be seen that the minimum diameter is increased compared to a conventional constant velocity joint. In this way, in a constant velocity joint according to the present invention, the diameter of the minimum diameter is increased compared to the conventional one, thereby improving rigidity and strength.

[0035] Specifically, the hub housing (100) is in a form in which a flange portion (120), a central portion (110), and an inner race portion (130) having a groove formed therein for seating a constant velocity joint ball are integrated, and a constant velocity joint is coupled to the outer side of the inner race portion (130) so as to transmit driving torque from the engine to the wheel. At the same time, a part of the central portion (110) of the hub housing (100) also performs the role of an inner ring (210) of a bearing assembly (200) to support the load of the vehicle.

[0036] Referring to Fig. 1, in the past, an inner washer was used to prevent friction noise caused by slip between the outer race and the bearing of the constant velocity joint during forward and reverse starts, but there was a limitation in that the coating film of the inner washer would peel off after driving a certain distance, and as a result, friction noise would remain.

[0037] In the present invention, by forming the hub housing (100) by integrating the flange portion (120), the central portion (110), and the inner race of the constant velocity joint, the connecting member between the hub housing (100) and the constant velocity joint can be eliminated, thereby reducing weight and manufacturing costs, improving driving fuel efficiency through weight reduction, and improving noise problems caused by the connecting member.

[0038] In addition, in the present invention, by forming the hub housing (100) by integrating the flange portion (120), the central portion (110), and the inner race of the constant velocity joint, quality problems caused by the loosening of the wheel hub nut that previously fixed the constant velocity joint housing and the wheel hub can also be improved.

[0039] In addition, in the present invention, by forming the hub housing (100) by integrating the flange portion (120), the central portion (110), and the inner race of the constant velocity joint, the backlash that occurred in the past due to the spline connection between the hub housing (100) and the outer race of the constant velocity joint can be resolved.

[0040] The inner ring (210) can be press-fitted and coupled to the outer surface of the hub housing (100) and can rotate together with the hub housing (100). Additionally, the inner ring (210) can serve as the inner track of the rolling element (230).

[0041] The outer ring (220) may be spaced apart from the hub housing (100) and the inner ring (210) and serves as the outer track of the rolling element (230). Additionally, the outer ring (220) is coupled to a knuckle, and as it is coupled to the knuckle, the outer ring (220) may be a non-rotating element in which its position does not change.

[0042] A rolling element (230) may be interposed between the hub housing (100) and the outer ring (220) and between the inner ring (210) and the outer ring (220). Depending on the embodiment, the rolling element (230) may be a ball or a roller and may rotate on the outer surface of the outer ring (220) and the hub housing (100) and on the raceway of the outer ring (220) and the inner ring (210).

[0043] Specifically, the rolling element (230) may include a first rolling element (231) disposed between the outer surface of the central part (110) and the outer ring (220), and a second rolling element (232) disposed between the outer ring (220) and the inner ring (210).

[0044] The first sealing member (500) is located on one side of the first rolling element (231) and is provided on the outer ring (220) and the outer surface of the central part (110), and the second sealing member (600) is located on the other side of the second rolling element (232) and can be provided between the outer ring (220) and the inner ring (210).

[0045] Here, the first sealing member (500) and the second sealing member (600) serve to prevent foreign matter from entering the interior of the bearing and to prevent the grease inside from leaking out.

[0046] Referring to FIG. 2, a hub-integrated constant velocity joint according to one embodiment of the present invention may include a plurality of hub caps (900). Here, the hub caps (900) serve to prevent grease from leaking out of the constant velocity joint and to prevent foreign matter from entering the constant velocity joint.

[0047] The constant velocity joint (800) serves to transmit the driving force transmitted through the engine and transmission to the hub housing (100).

[0048] The preload ring (300) is coupled to the outer surface of the central portion (110) and may be located on the other side of the inner ring (210). At this time, the preload ring (300) may be coupled to the outer surface of the hub housing (100) by means such as assembly or press-fitting. One side of the boot (400) may be coupled to the outer surface of the preload ring (300), and the other side may be coupled to the outer surface of the constant velocity joint (800). The boot (400) serves to prevent grease leakage inside the constant velocity joint and to prevent foreign matter from entering the constant velocity joint.

[0049] Specifically, a coupling structure may be formed on the outer surface of the preload ring (300), the inner surface of the boot (400) coupled to the preload ring (300), the outer surface of the constant velocity joint, and the inner surface of the boot (400) coupled to the outer surface of the constant velocity joint.

[0050] According to an embodiment, a protrusion may be formed along the outer surface of the preload ring (300), and a groove corresponding to the shape of the protrusion may be formed on the inner surface of the boot (400) corresponding to the protrusion formed on the outer surface of the preload ring (300). According to another embodiment, a groove may be formed along the outer surface of the preload ring (300), and a protrusion corresponding to the shape of the groove may be formed on the inner surface of the boot (400) corresponding to the groove formed on the outer surface of the preload ring (300). However, this is merely an example, and the shape of the coupling structure formed on the outer surface of the preload ring (300) and the inner surface of the boot (400) coupled to the preload ring (300) is not limited thereto.

[0051] In addition, when comparing FIG. 1 and FIG. 2, in the hub-integrated constant velocity joint according to one embodiment of the present invention compared to the conventional one, one side of the boot (400) is connected to the outer surface of the preload ring (300) and the other side is connected to the outer surface of the constant velocity joint, so that the external exposed portion of the boot (400) is reduced compared to the conventional one, thereby preventing the boot (400) from being damaged by the impact of dust.

[0052] Meanwhile, as shown in FIG. 4, a stopper ring (700) that prevents the constant velocity joint ball from coming loose may be provided on the inner side of the housing of the constant velocity joint. Although not shown in detail in the drawings, according to the embodiment, a groove of a certain depth may be formed on the inner surface of the constant velocity joint housing, and by assembling the stopper ring (700) into the groove, the constant velocity joint ball may be prevented from coming loose.

[0053] FIG. 5 is a drawing for explaining a hub-integrated constant velocity joint according to another embodiment of the present invention. As shown in FIG. 5, the outer race and shaft of the constant velocity joint may be composed of separate parts rather than being integral, as in the hub-integrated constant velocity joint according to another embodiment of the present invention, and the shaft may be assembled by press-fitting it into the outer race. Explanation of the symbols

[0055] 100: Hub housing 110: Central section 120: Flange section 130: Inner lace section 200: Bearing Assembly 210: Inner ring 220: Outer ring 230: Rolling element 231: First rolling element 232: Second electric body 300: Preload ring 400: Boot 500: First sealing member 600: Second sealing member 700: Stoppering 800: Constant velocity joint 900: Hub cap

Claims

Claim 1 A hub-integrated constant velocity joint comprising: a central portion to which a bearing assembly is coupled as a hub housing; a flange portion formed on one side of the central portion to which a wheel is coupled; and an inner race portion formed on the other side of the central portion and having a groove formed on its outer surface for seating a constant velocity joint ball, wherein the inner race portion is integrated with the hub housing. Claim 2 A hub-integrated constant velocity joint according to claim 1, characterized by comprising: an inner ring coupled to a part of the outer surface of the central portion; an outer ring spaced apart from the hub housing and the inner ring by a certain distance; and rolling elements provided between the hub housing and the outer ring and between the inner ring and the outer ring. Claim 3 A hub-integrated constant velocity joint according to claim 2, further comprising a preload ring coupled to the outer circumference of the central portion and located on the other side of the inner ring. Claim 4 A hub-integrated constant velocity joint according to claim 3, further comprising a boot, one side of which is coupled to the outer surface of a preload ring and the other side of which is coupled to the outer surface of a constant velocity joint. Claim 5 A hub-integrated constant velocity joint according to claim 4, characterized in that a coupling structure is formed on the outer surface of a preload ring and the inner surface of a boot coupled to the preload ring, and on the outer surface of a constant velocity joint and the inner surface of a boot coupled to the outer surface of the constant velocity joint, respectively. Claim 6 A hub-integrated constant velocity joint according to claim 1, characterized in that a plurality of pairs of grooves facing each other are formed in the inner race portion, and the diameter of the inner race portion is the distance between the lowest ends of the pairs of grooves facing each other. Claim 7 A hub-integrated constant velocity joint according to claim 2, characterized in that the rolling element comprises: a first rolling element disposed between the outer surface of the central portion and the outer ring of the bearing; and a second rolling element disposed between the outer ring of the bearing and the inner ring of the bearing. Claim 8 A hub-integrated constant velocity joint according to claim 7, further comprising: a first sealing member provided on the outer ring of a bearing and the outer surface of a central portion located on one side of a first rolling element; and a second sealing member provided between the outer ring of a bearing and the inner ring of a bearing located on the other side of a second rolling element. Claim 9 A hub-integrated constant velocity joint according to claim 1, further comprising a stopper ring provided on the inner side of the housing of the constant velocity joint and preventing the constant velocity joint ball from dislodging.

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