JP3720475B2 - Air operated hub clutch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is an air-operated hub clutch that is attached to a front wheel of a four-wheel drive vehicle and switches between transmission and disconnection of driving force between an axle and a wheel hub by air control, and more specifically, an airtight chamber that controls switching. The present invention relates to an oil seal mounting structure which is an airtight holding means.
[0002]
[Prior art]
In a part-time four-wheel drive vehicle, a hub clutch device is incorporated between the front wheel hub and the axle so that the transmission state of the driving force to the wheel is switched.
[0003]
FIGS. 4 and 5 show a hub clutch device 1 that uses air pressure to switch driving. A spindle 3 that is fixed to a vehicle knuckle and is fixed to a front wheel axle 2 is externally fitted. The spindle 3 is tapered. A wheel hub 6 is rotatably supported via bearings 4 and 5.
[0004]
An inner ring 7 as a driving member of the hub clutch device 1 is externally fitted and inserted into the front end of the front wheel axle 2 via a serration 8 so that the rotation is integrated and movable in the axial direction. An external gear 9 is provided, and an outer ring 10 that is a driven member on the outside of the inner ring 7 is rotatably fitted. A rear end surface of the outer ring 10 is fixed to an end surface of the wheel hub 6 by a plurality of bolts 11. The internal gear 12 is provided with an internal gear 12 on which the external gear 9 can be engaged and disengaged.
[0005]
The tip of the outer ring 10 is hermetically sealed by a lid 13, and a slider 14 housed in the outer ring 10 so as to be movable in the axial direction and the inner ring 7 are coupled so as to move integrally in the axial direction. The two airtight chambers 15 and 16 are cut off on both sides by 14.
[0006]
A spring 17 that constantly presses the inner ring 7 to the retreat side position is contracted between the opposed surfaces of the slider 14 and the cover 13, and when the inner ring 7 is in the advance side position at the center of the outer surface side of the slider 14, the cover A magnet 18 which is attracted to 13 and holds the state where the external gear 9 is detached from the internal gear 12 is fixed via a case 19.
[0007]
In order to control the switching between the two-wheel drive state and the four-wheel drive state by moving the inner ring 7, as shown in FIG. 4, the outer ring 10 penetrates the outer ring 10 in the axial direction and the outer hermetic chamber 15 and the notch 20 of the lid 13 are provided. An air passage 21 that communicates with each other is provided. The air passage 21 is connected to the space 22 between the spindle 3 and the wheel hub 6 through the air piping connected to the space 22 at the inside of the tapered bearings 4 and 5 incorporated in the space and the rear end of the spindle 3. It is connected to an air source (not shown) that switches between supply and discharge of negative pressure or positive pressure air by remote control from a wheel drive vehicle transfer or the like.
[0008]
The inner hermetic chamber 16 has a gap formed between the fitting surfaces of the front wheel axle 2 and the spindle 3 as an air passage 23, and an air pipe 24 provided at the rear end of the spindle 3 so as to communicate with the gap. Connected to the air source.
[0009]
The fail-safe mechanism provided on the lid 13 supports the pin 26 so as to be movable in the axial direction by a pin case 25 fixed to the center of the lid 13, and pushes the pin 26 to push the magnet 18 from the lid 13. The slider 14 and the inner ring 7 are moved by the spring 17 and the external gear 9 is meshed with the internal gear 12.
[0010]
The hub clutch device 1 is configured as described above, and when driving four wheels, the slider 14 and the inner ring 7 are moved rearward and the external gear 9 is engaged with the internal gear 12 as shown in FIG.
[0011]
As a result, a four-wheel drive state in which the front wheel axle 2 and the outer wheel 10 are directly connected is achieved, and the engine brake can be applied to the front and rear wheels simultaneously.
[0012]
In order to switch from the four-wheel drive state to the two-wheel drive state, the air in the sealed airtight chamber 15 is sucked and overcomes the spring 17 by the negative pressure acting on the slider 14 to overcome the slider 14 and the inner ring 7. Is moved outward and the magnet 18 is attracted to the lid 13 to disengage the external gear 9 from the internal gear 12.
[0013]
As described above, the two-wheel drive state and the four-wheel drive state can be switched by applying a negative pressure or a positive pressure to either of the airtight chambers 15 or 16 on both sides of the slider 14 and the two-wheel drive state. Is held by attracting the magnet 18 to the lid 13, and the four-wheel drive state is held by the pressing force of the spring 17.
[0014]
By the way, in the hub clutch device that switches between the two-wheel drive state and the four-wheel drive state as described above by the air pressure, the inner airtight chamber 16 needs to be kept airtight. At the position, it is attached to the spindle 3 and pressed against the inner surface of the outer ring 10 to block the communication between the passages 21 and 23, thereby keeping the airtight chamber 16 airtight and isolating the airtight chambers 15 and 16. An oil seal 27 is incorporated.
[0015]
An oil seal 27 mounting structure that has been conventionally employed includes an oil seal inner ring 28 that is externally fixed to the end of the spindle 3, a nut 29 that is externally screwed onto the spindle 3, and an overlap between the inner ring 28 and the nut 29. The four parts are an O-ring 30 interposed between the surfaces and a plurality of countersunk machine screws 31 for connecting the inner ring 28 and the nut 29.
[0016]
As shown in FIG. 6, the inner ring 28 for oil seal has an inner diameter that fits externally to the spindle 3, and a flange 33 is formed on the outer diameter surface of one end of the cylindrical portion 32 that fits the oil seal 27 on the outer diameter surface. A projecting piece 34 that is provided around the inner periphery of the cylindrical portion 32 engages with a notch 35 of the spindle 3 and is fixed to the spindle 3 in a non-rotating manner. In addition, screw insertion holes 36 are provided in the flange 33 at regular intervals in the circumferential direction.
[0017]
The nut 29 is provided with a female screw 38 fitted on the inner peripheral surface of the nut 29 with respect to a male screw 37 provided on the outer peripheral surface of the spindle 3, and a concave portion of the inner ring 28 on the inner peripheral portion of the surface overlapping the flange 33 of the inner ring 28. A protrusion 40 that fits into the stepped portion 39 and maintains the coaxial center is provided, and a screw hole 41 for screwing the countersunk machine screw 31 is provided at a position corresponding to each screw insertion hole 36 of the flange 33. ing.
[0018]
As described above, the oil seal inner ring 28 is fixed to the nut 29 screwed to the spindle 3 with the countersunk machine screw 31, and the oil seal 27 is interposed between the cylindrical portion 32 of the inner ring 28 and the inner peripheral surface of the outer ring 10. It is provided to shield both passages 21 and 23 in an airtight manner. The nut 29 fixes the tapered bearing 4 via a washer 42 and a spacer 43.
[0019]
[Problems to be solved by the invention]
As described above, since the conventional oil seal mounting structure uses four parts, there are problems that the number of parts is large and not only is troublesome to incorporate, but also the cost is high.
[0020]
In addition, since the oil seal inner ring 28 is fixed to the nut 29 with the countersunk machine screw 31, if the eccentricity of the oil seal inner ring 28 is large, air leakage occurs. To prevent this, the eccentric accuracy of the inner ring 28 and the nut 29 is prevented. There is a problem that the processing cost and the assembly cost are high.
[0021]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an air-operated hub clutch nut that can be installed with a small number of parts and that does not require increased eccentricity, and that can reduce processing costs and assembly costs. It is in.
[0022]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention of claim 1 is configured such that a driving member connected to an axle and a driven member connected to a wheel hub are rotatably fitted inward and outward, and the driven member and the driving member are interposed. In an air-operated hub clutch in which a drive member and a driven member are connected and disconnected by supplying and discharging air through an air passage that is connected to the air-tight chamber. A nut that is screwed and fixed to a spindle serving as a fixing portion is adopted in which a support cylinder of an oil seal that projects from the nut and is interposed between a driven member and shields an airtight chamber is integrally provided. .
[0023]
The invention of claim 2 is configured such that the nut is caulked and fixed to the spindle.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 shows an air-operated hub clutch device according to the present invention. The basic structure of the hub clutch device 1 is as shown in FIGS. 4 and 5, and is the same as in FIGS. The same reference numerals are used to replace the description of the structure.
[0026]
The nut 51 of the present invention to be fixed to the end of the spindle 3 includes a polygonal nut member 53 having an inner peripheral surface provided with a female screw 52 that is externally engaged with the male screw 31 of the spindle 3, and the nut member 53. A cylindrical support tube 54 that protrudes coaxially in the axial direction from the middle of one surface side and supports the oil seal 27 and a short cylindrical portion 55 having an inner diameter extending on one surface side of the nut member 53 are integrated. It has a structure coupled to.
[0027]
The nut 51 is screwed onto the end of the spindle 3 to fix the taper bearing 4 via the washer 42, and an oil seal 27 is assembled between the support cylinder 54 provided on the nut 51 and the outer ring 10.
[0028]
The nut 51 is fixed to the spindle 3 by forming a part of the cylindrical portion 55 as a caulking portion 57 that is bent and engaged in a notch portion 56 provided at an end portion of the spindle 3.
[0029]
As a result, the hermetic chamber 16 of the hub clutch device 1 is airtightly held by the oil seal 27, whereby both of the hermetic chambers 16 and 15 are shielded, and the action of the air causes the inner ring 7 to travel to the 2nd and 4th driving positions. Switching can be performed without any problem.
[0030]
【The invention's effect】
As described above, according to the present invention, by providing an oil seal support cylinder integrally with a nut, the conventional inner ring for oil seal, nut, and countersunk machine screw can be combined with one nut, and an O-ring is not required. Therefore, it is possible to reduce the number of components, save the time and effort of assembly, and reduce the cost.
[0031]
In addition, the integration of the nut and the support cylinder eliminates the need for increasing the eccentricity accuracy and facilitates production.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main portion of a hub clutch device according to the present invention in a two-wheel drive state. FIG. 2 is a cross-sectional view taken along an arrow II-II in FIG. Fig. 5 is a longitudinal sectional view showing the main part of the clutch device in the two-wheel drive state. Fig. 6A is a front view of a conventional inner ring for oil seal, and Fig. 5B. Is a longitudinal sectional side view, (C) is a front view of the nut, (D) is a longitudinal sectional view of the same.
DESCRIPTION OF SYMBOLS 1 Hub clutch apparatus 3 Spindle 6 Wheel hub 7 Inner ring 9 External gear 10 Outer ring 12 Internal gear 14 Slider 15, 16 Airtight chamber 18 Magnet 21, 23 Air passage 27 Oil seal 51 Nut 52 Female screw 53 Nut member 54 Support cylinder 55 Cylinder Part 56 Notch part 57 Caulking part

Claims (2)

A drive member connected to the axle and a driven member connected to the wheel hub are rotatably fitted inside and outside, an airtight chamber is provided between the driven member and the drive member, and air is passed through an air passage that is conducted to the airtight chamber. In the air-operated hub clutch in which the drive member and the driven member are coupled and separated by controlling the above, a nut that is externally fitted to the axle and screwed and fixed to a spindle that serves as a fixing portion protrudes from the nut. An air-actuated hub clutch comprising an oil seal support tube integrally provided between a driven member and a hermetic chamber. The air-operated hub clutch according to claim 1, wherein the nut is caulked and fixed to the spindle.

Images