KR20050005103A - Divided drive shaft for constant velocity joint - Google Patents

Abstract

PURPOSE: A split-type drive shaft for a constant velocity joint is provided to easily replace a boot while the constant velocity joint is mounted to a vehicle by separating a C-ring and separating a coupling shaft, and then replacing a boot toward a drive shaft when the boot is broken. CONSTITUTION: In a split-type drive shaft for a constant velocity joint(100), one drive shaft(S) of the constant velocity joint is split into an input shaft(S1) and an output shaft(S2). In one of the split shafts, the bore is formed as a hollow part. A spline is formed to the bore of the hollow part and the other shaft is fitted. Power is connected through spline coupling. A recessed groove(R1) is formed to the spline of the shaft and a C-ring(R2) is inserted in the recessed groove to prevent a spline connection shaft from moving in the axis direction of the shaft.

Description

Separate drive shaft for constant velocity joints {DIVIDED DRIVE SHAFT FOR CONSTANT VELOCITY JOINT}

The present invention improves the shape of the drive shaft connected between the constant velocity joints used in the drive shaft system for automobiles so that the constant velocity joint in the vehicle body when the boot of the constant velocity joint breaks most frequently in the drive shaft system for automobiles A drive shaft for a constant velocity joint that can be replaced or repaired without being removed.

In general, the drive shaft connected to the constant velocity joint is formed by one axis. Such a shaft has an effect of reducing the weight by using a hollow hollow shaft, but has a problem in that workability is inconvenient during repair because it is made of a single body.

Referring to FIG. 1, FIG. 1 illustrates a constant velocity joint 100 made of a conventional shaft S, and FIG. 2 illustrates a work process for replacing the conventional constant velocity joint 100 shown in FIG. 1. As a working example illustrating an example, as shown in the drawing, the inside of the constant velocity joint 100 is a constant velocity joint 100 while the ball 11 or roller makes a cloud or sliding motion at the inner ring 12 of the constant velocity joint. It maintains a constant rotational angular velocity even if the bidirectional axis is shifted.

At this time, when foreign matter enters the constant velocity joint 100, the inner ring of the constant velocity joint is broken, causing severe vibration or noise, and the rubber boot 20 is coupled to the constant velocity joint to prevent the foreign matter intrusion.

The boot 20 mounted on the constant velocity joint 100 used in a vehicle has a severe deformation change due to the change in the angle of two axes connected to the constant velocity joint 100 according to the amount of rotation of the wheel, and the foreign matter such as sand boots 20 Attached to the crack is very likely to occur when a certain time or more boot 20 is to be broken. When the boot 20 is broken, foreign matter penetrates into the constant velocity joint 100, and the inner surface of the constant velocity joint is damaged or causes severe noise and vibration.

Therefore, in order to prevent the expensive constant velocity joint 100 from being damaged, a relatively inexpensive boot 20 should be periodically replaced. The boot 20 is coupled to the constant velocity joint 100 and the drive shaft S. It is very difficult to replace.

In detail, the operation of replacing the boot 20 of the conventional constant velocity joint 100 is performed as follows, as shown in FIG. 2.

1) Lift the car to a certain height using a lift (not shown in the figure), then remove the car tire 1 from the wheel 2 and the wheel 2 from the wheel bearing.

2) After the wheel bearing is separated from the constant velocity joint 100, a clamp for separating the constant velocity joint 100 connected to the drive shaft S from the transmission and fixing the boot 20 to the constant velocity joint 100 ( C) is separated.

3) Remove the ball, cage, etc. inside the constant velocity joint 100 to check whether the inside of the constant velocity joint is damaged. If the inside of the constant velocity joint is not damaged, clean the internal parts and apply grease.

4) Insert the boot 20 and then combine the constant velocity joint 100 inside.

Assembly is performed through the reverse process to the above process.

As described above, the procedure of the conventional boot exchange method is very complicated, and most of the drive shaft systems of the automobile, such as automobile wheels, wheel bearings, and constant velocity joints, must be separated. In addition, peripheral devices such as tie rods connected to the steering shaft and ball joints of the suspension kingpin must also be dismantled. The spline part of the constant velocity joint, which is inserted into the wheel hub, is very difficult to assemble and dismantle, which is very expensive.

When the drive shaft S is separated from the constant velocity joint 100, a defect may occur due to a separate load, such as a ball, a cage, an inner ring, an outer ring, etc. inside the constant velocity joint. The exchange cost is even greater because it is necessary.

Furthermore, the automotive industry is also increasing the warranty period for auto parts. For example, the current warranty period for Hyundai Motor Company in the US is the engine and transmission of the power train within 10 years, 160,000 km, and full coverage (fu1l coverage). In the case of less than 5 years and 80,000 km, it is highly likely that boot replacement will be required within the warranty period, which is expected to put a heavy burden on the automakers due to the high cost of maintenance.

Due to the large deformation of the boot itself and poor use environment, it has a short lifespan, but the constant velocity joint main component has sufficient rigidity, so that if foreign materials do not invade, it is hardly damaged, and other peripheral devices (wheel bearings, drive shafts, etc.) also have long life. Therefore, if the boot replacement method is easy, it is possible to periodically change the boot, such as oil change of the vehicle, brake pedal replacement, etc. As a result, it will be possible to use the constant velocity joint for a long time at low cost.

In the prior art, although the Korean Utility Model Registration No. 125857 (notice date: 1999.05.15) used a shaft joint using a hollow shaft at both ends for adjusting the length of the drive shaft, there are problems in terms of manufacturing process or strength of the hollow shaft at both ends. It is expected that the stiffness per unit weight is reduced by using the central axis of the central part, and the vibration and noise characteristics are very likely to deteriorate, and there is no device for facilitating boot exchange.

Furthermore, as in US Pat. No. 489396OA (January 16, 1990), a technology for integrating a constant speed joint / wheel bearing unit with a wheel bearing and a constant velocity joint has been developed. Therefore, due to the disadvantage of replacing the entire expensive wheel bearing / constant velocity joint unit has not been commercialized.

As described above, in the related art, there is no technology that facilitates the exchange of a boot having a relatively short life in the drive shaft by allowing the shaft to be separated while the constant speed joint is sufficiently mounted at the same time as the shaft bending rigidity is sufficiently increased.

In addition, utility model registration No. 266084 (Notice date: Feb. 27, 2002) has been proposed to replace damaged boot, such as "clamp band for automobile constant velocity joint", but the elastic deformation of the boot due to the pressure of the band It is difficult to cope with the problem that the rupture due to fatigue due to the deformation proceeds faster in the area pressed by the band has not been an effective alternative.

The present invention has been invented to solve the above problems, an object of the present invention is to divide one drive shaft connected to the constant velocity joint of the vehicle into two shafts, connecting the spline shaft joint between the two shafts, C It is a structure that fits the ring into the groove, and when the boot is broken, the C-ring is removed, the shaft joint connecting shaft is disconnected, and the boot is exchanged toward the drive shaft so that the constant speed joint can be easily exchanged with the constant velocity joint mounted on the vehicle. To provide a separate drive shaft for the.

The separate drive shaft for the constant velocity joint according to the object of the present invention is divided into a transmission mission side, that is, an output side shaft outputting power to the power input side and the wheel side, so that power is transmitted between the divided shafts through spline shaft joints. Each of the shaft spline shaft joints is formed to have a groove in the shaft so as not to move in the axial direction of the shaft, and to achieve the C ring on the groove.

In the present invention, by moving the spline shaft joint shaft connected between the two shafts in the axial direction of the shaft, any one of the shafts can be separated to the outside, through which the exchange of boot even if not all of the constant velocity joints from the body It can be done easily.

Of course, there is no need to disassemble the surrounding parts as in the prior art to separate the constant velocity joint, so that the work time is very fast and the work is easily performed.

1 is a cross-sectional view showing a drive shaft configuration of a general constant velocity joint,

2 is a block diagram showing a conventional boot exchange method process;

3, 4 is a cross-sectional view showing the configuration of a drive shaft divided into two according to the present invention,

5 is a cross-sectional view showing the configuration of a drive shaft divided into three according to the present invention,

6 is a schematic diagram illustrating a boot exchange process according to the present invention;

7 is a perspective view illustrating an example of a detachment / assembly jig used for detachment and assembly of a drive shaft connected by a spline shaft joint according to the present invention.

<Description of the symbols for the main parts of the drawings>

S: Drive shaft S1: Spline connecting shaft

S1, S2: Separate drive shaft R1: Groove

R2: C-ring TM: Transmission

20: Boot 30: Jig

100: Constant velocity joint

Hereinafter will be described in detail the embodiment through the accompanying drawings for the separate drive shaft for the constant velocity joint according to the present invention.

Referring to FIG. 3, FIG. 3 is a cross-sectional view of an example of a constant velocity joint assembly showing an exemplary embodiment in which at least two shafts are divided into exemplary embodiments according to the present invention, and FIG. 4 includes two shafts. A cross-sectional view of a constant velocity joint assembly illustrating another embodiment in which power transmission between two shafts is implemented by a shaft joint connecting shaft S3 having a spline formed in the inner diameter between split and divided shafts, which is connected to the constant velocity joint according to the present invention. A characteristic of the drive shaft is that the drive shaft is divided into two or three shafts and combined by a spline connecting shaft (S3) in order to exchange the boot in a state where the constant velocity joint is mounted on the vehicle as shown in FIG. The shafts S1 and S2 allow the two divided shafts to be connected to the spline connecting shaft S3 such as a spline, and then the groove R1 is formed in the two shafts. By fitting property and the C ring (R2) in the groove, the operation when the axial direction is that the two axes are not decomposed.

The two shafts are coupled in a spline shape, and are intended to have sufficient strength in power transmission of the shaft by using a hollow shaft to increase shaft bending rigidity.

The spline shape of the hollow shaft connected to the plunging joint in the two shafts can be easily produced by local forming swaging and heat treatment.

The shaft connected to the constant velocity joint in the two shafts is a passage for exchanging the boot, and the size of the outer diameter should not increase toward the right side.

The plunging shaft joint connected to the transmission TM is designed to be movable in the axial direction, and the axial length of the drive shaft S spline is designed to be smaller than the axially movable length of the plunging shaft joint. The spline connection shaft S3 can be detached in a state where the constant velocity joint 100 is mounted on the vehicle.

Boot exchange in the vehicle to which the drive shaft which is easy to attach and detach the boot 20 when the constant velocity joint 100 configured as described above is mounted in the vehicle is shown in FIG. 5 and specifically as follows.

1) Make the steering angle so that the drive shaft connected to the plunging joint is on the opposite end of the transmission (TM).

2) Separate the spline connecting shaft (S3) using the separating / assembling jig 30 to the constant velocity joint drive shaft (S1, S2) divided into two axes as shown in FIG.

3) Align the two axes connected to the constant velocity joint in a straight line.

4) Remove the clamp securing the boot 20 to the constant velocity joint 100.

5) Replace the boot and then clamp it back.

6) Insert the C ring (R2) into the groove (R1) of the spline shaft and refit the two shafts.

The C ring (R2) connected to the spline connecting shaft (S3) can be adjusted to be separated over a certain range of axial loads by adjusting the cross-sectional thickness and material stiffness, etc. Since the force acting in the axial direction by the launching motion is small, the two-axis coupling can be stably maintained, and the spline connecting shaft S3 can be separated without damaging the peripheral device during boot exchange.

As described above, according to the drive shaft connected to the constant velocity joint according to the present invention, by combining the constant speed joint in the vehicle mounted state, the drive shaft is easy to detach the boot, the state of being mounted without separating the drive shaft from the vehicle body during boot exchange By changing the low boot, it is possible to change the boot quickly at low cost even without unnecessary work, and to periodically change the boot, such as changing the engine oil change brake pad, resulting in the use of expensive constant velocity joints at low cost. It can be expected to improve the noise and vibration characteristics by increasing the bending stiffness and to extend the service life, and to enable the integration of relatively expensive and long-life peripheral devices to make the constant velocity joint / wheel bearing unit practical. Have .

Claims (5)

In the constant velocity joint of an automobile, a drive shaft of one constant velocity joint is divided into a power input shaft shaft S1 and an output shaft shaft S2, respectively, and the shaft inner diameter of any one of the divided shafts is formed as a hollow portion. Separating drive shaft for a constant velocity joint, characterized in that the spline is formed in the inner diameter to insert the remaining shaft so that the power is connected by the spline coupling. The constant velocity joint of claim 1, wherein the groove is formed on the spline of the shaft, and a C ring is inserted into the groove so that the spline connecting shaft S3 does not move in the axial direction of the shaft. Drive shaft. According to claim 1, further comprising a groove and a C ring coupled to the groove on the circumferential surface of the output shaft so that the spline connecting shaft (S3) assembled on the divided output shaft does not move in the axial direction of the shaft. Detachable drive shaft for a constant velocity joint comprising a. In the constant velocity joint of an automobile, the drive shaft S of one constant velocity joint 100 is divided into a power input shaft shaft S2 and an output shaft shaft S2, respectively, and the circle of each of the divided shafts S1 and S2 is divided. Spline is formed on the main surface, respectively, between the two shafts through the connecting shaft (S3) coupled by the respective spline method connected the power of the two shafts (S1, S2) separated Detachable drive shaft. According to claim 4, Grooves on the circumferential surface of the shaft (S1, S2) so that the shaft joint connecting shaft (S3) assembled to the two separate shafts (S1, S2) is not moved in the axial direction of the shaft R1) and a C-ring (R2) coupled to the groove (R1) further comprises a separate drive shaft for the constant velocity joint.