JPH0569385U - Viscous pump - Google Patents

Abstract

(57) [Abstract] [Purpose] In a viscous pump that is composed of a rotating body and a non-rotating body on which a spiral ridge is formed, and the viscous pump moves the viscous fluid toward the center of the rotating body, the spiral ridge and the spiral ridge. The gap between and is appropriately maintained, and the performance of the viscous pump is improved, and the durability of the rotating body, the spiral ridge, and the viscous fluid is improved. A rotary plate 23 that is pressed against the differential case 3 and rotates integrally with the differential case 3, a fixed plate 24 that is opposed to the rotary plate 23 and that fits on the inner peripheral surface 2a of the differential cover, and an outer peripheral surface 25a on the inner periphery thereof. And the inner peripheral surface 25b are crimped to support plate 25c
A rubber plate 25, which is an elastic member that supports the roller, is provided.
Formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a non-contact type viscous pump that conveys a viscous fluid toward the inside of a rotating body against centrifugal force, and more particularly to a non-contact type viscous pump used in an automobile inter-acs differential. .

[0002]

[Prior Art]

 It is composed of a rotating body that rotates with a rotating shaft and a non-rotating body that faces the side surface of the rotating body and has spiral ridges formed thereon. A viscous pump principle is known in which the rotor is moved inward of the rotating body against the centrifugal force.

In order to put this viscous pump into practical use, the gap between the rotating body and the spiral ridge becomes a problem. That is, the viscous fluid such as oil moves inward of the rotating body because the staying force due to the viscosity of the oil itself and the viscous friction force when the oil collides with the spiral ridge are generated by the rotating body. It is when the centrifugal force is overcome, and it is desirable to make the oil collide with the spiral ridge as much as possible. For that purpose, it is desirable that the gap between the rotating body and the spiral ridge be as small as possible, and ideally there should be no gap.

[0004]

[Problems to be solved by the device]

 However, in reality, there is a gap between the rotor and the spiral ridge due to assembly error and manufacturing error, and the pressure contact force between the rotor and spiral ridge is too strong. It is difficult to maintain the gap. Therefore, a contact type in which there is no gap in which the rotor and the spiral ridge formed on the spiral plate are contacted from the beginning, or a gap is previously provided between the rotor and the spiral ridge so that the two do not come into contact with each other. There are two types of viscous pumps of the contact type.

In the non-contact type viscous pump, if the gap between the rotating body and the spiral ridge is too wide, the oil is less likely to collide with the spiral ridge, and the centrifugal force of the rotary body causes the oil to move in the outer peripheral direction of the rotary body. If it is moved, the performance of the pump will be significantly reduced, and in the worst case, it will not function as a pump.

Further, in a viscous pump in which a rotating body and a spiral ridge are in contact with each other, there is a case where the two are in strong pressure contact with each other, the frictional resistance between the two is large, and the friction heat generated thereby Due to the deterioration of oil and wear of the rotor and spiral ridges, durability problems occur.

Further, when assembling the pump, it is necessary to pay attention to the size of the gap, which causes a problem that workability is not good.

[0008]

[Means for Solving the Problems]

 Therefore, in the present invention, a rotating body that rotates together with a rotating member and a rotating body that are opposed to each other are provided with a gap therebetween, and the centrifugal force of the rotating body moves the viscous fluid to move in the centrifugal direction. In the non-contact viscous pump, which comprises a non-rotating body in which a spiral ridge that regulates the inner side of the rotary body is formed, an elastic member for elastically contacting the spiral ridge with the rotary body is provided.

[0009]

[Action]

 The elastic protrusion of the elastic member causes the spiral ridge to appropriately press against the rotating body, so that the gap between the rotating body and the spiral ridge is eliminated, and the fluid friction between the viscous fluid and the spiral ridge is increased.

[0010]

【Example】

 Hereinafter, a first embodiment of the present invention will be described. FIG. 5 shows a rear front axle side inter-acru differential (hereinafter referred to as "inter differential") in a rear two-wheel drive heavy truck provided with the viscous pump of the present invention. A propeller shaft 1 that transmits a driving force from a transmission (not shown) is connected to an inter differential case 3 (hereinafter referred to as “different case 3”) inside an inter differential cover 2 (hereinafter referred to as “differential case 3”). Then, the differential case 3 is rotated. The rotation of the differential case 3 is transmitted to the front differential gear 6 and the rear differential gear 7 via a pair of differential pinions 5 supported by the spider 4. Further, the rotation of the front differential gear 6 is transmitted to the reduction gear on the rear rear wheel side (not shown) via the through shaft 8 and the tandem propeller shaft 9, and the rotation of the rear differential gear 7 is transmitted to the rear front axle side via the pair of helical gears 10. It is transmitted to the reduction gear 11. This inter-diff is the same as a normal diff device, and when a rotation difference occurs between the axles during cornering, the diff pinion 5 rotates to absorb the rotation difference.

A diff lock 12 including divided diff carriers 12A and 12B is disposed on the rear side of the inter-diff. The diff lock 12 connects the through shaft 8 and the helical gear 10 to stop the function of the inter diff when the vehicle runs on a rough road such as muddy road, and the lock clutch 14 is locked by the air cylinder 13. It is designed to slide.

Further, in this inter-diff, the lubricating oil 16 which is a viscous fluid is supplied into the diff cover 2 for cooling. The structure is such that the rotating reduction gear 11 scrapes up the lubricating oil 16 stored in the lubricating oil sump portion 15A provided in the lower portion of the Acrus housing 15, and uses it as droplets to spray the sliding parts and gears. It is a splash refueling system that feeds to the meshing parts.

On the other hand, an oil passage 18 for guiding the scraped-up lubricating oil 16 into the differential cover 2 is formed in the upper portion of the Acrus housing 15 and the differential carriers 12A, 12B. Then, the lubricating oil 16 supplied into the oil passage 18 is further sent into the differential cover 2 and accumulated in the lower portion thereof. The lubricating oil 16 accumulated in the lower portion is scraped up by the differential case 3 and adheres to the inner peripheral surface 2a of the differential cover 2. The inner peripheral surface 2a is tapered toward the bearing 19b side (right side in the drawing) so as to spread toward the end.

In the inter-diff having such a structure, the viscous pump 22 is arranged between the differential cover 2 and the differential case 3 in the vicinity of the bearing 19B. As shown in FIGS. 1 and 2, the viscous pump 22 is composed of a rotating plate 23 which is a rotating body and a fixed plate 24 which is a non-rotating body. Since the rotary plate 23 is formed by integrally forming a cylindrical flange portion 23a on a link-shaped disc, a hole 23b is formed in the vicinity of the center of the disc obliquely with respect to the axial direction. It is press-fitted into the end portion 3a of the shaft and rotates integrally with the differential case 3.

The fixing plate 24 has a donut shape in which the peripheral edge 24 a is bent in the axial direction, and the peripheral edge 24 a is fitted on the inner peripheral surface 2 a of the differential cover 2. On the inner side surface of the fixed plate 24, an outer peripheral surface 25a is pressure-bonded to the peripheral edge 24a of the fixed plate 24, and an inner peripheral surface 25b is formed with a rubber plate 25 which is an elastic member pressed against the flange portion 23a of the rotary plate 23. On the back surface of the rubber plate 25, a ring-shaped reinforcing plate 25c is provided.

Further, on the surface of the rubber plate 25 on the rotary plate 23 side, a ridge 26 is formed which draws a spiral around the through shaft 8. The rubber plate 25 is pressed against the fixed plate 23 by its own elastic force, and no gap is formed between the rotary plate 23 and the ridge 26.

Further, the differential case 3 and the rear differential gear 7 are formed with holes 3 b and 7 a which communicate with the hole 23 b and guide the lubricating oil 16 sent from the pump 22 to the inside of the differential case 3.

By forming the pump 22 having such a structure between the differential cover 2 and the differential case 3, the lubricating oil 16 scraped up by the reduction gear 11 and passing through the oil passage 18 and accumulated in the lower portion of the differential cover 2 is removed. As shown in FIG. 3, the differential case 3 rotates to adhere to the inner peripheral surface 2a of the differential cover 2 and move along the inner peripheral surface 2a to the pump 22 side.

The moving lubricating oil 16 is pushed by the rotation of the rotary plate 23 from the outer peripheral end opening 26a of the spiral of the ridge 26 into the spiral groove formed by the ridge 26, and the outer peripheral portion 25a and the inner peripheral portion 25b. By virtue of the viscous frictional force generated by the collision with the protrusion 26 without leaking to the fixed plate 24 side, the space between the spiral protrusions 26 is moved toward the center of the through shaft 8, and the holes 23b, After passing through 3b and 7a and entering the differential case 3, the differential pinion 5, the front differential gear 6, and the riff differential gear 7 are lubricated.

When the rotation plate 23 is pushed into the pump 22 and the space between the protrusions 26 is filled with the lubricating oil 16, the protrusions 26 pressed against the rotation plate 23 by the centrifugal force generated by the rotation of the rotation plate 23. Is supported by the outer peripheral portion 25a and the inner peripheral portion 25b and moves to the right in the drawing, and a slight gap is generated between the ridge 26 and the rotary plate 23. Then, a part of the lubricating oil 16 flowing in the center direction between the ridges 26 moves in the gap in the outer peripheral direction and is interposed between the rotary plate 23 and the ridges 26, so that the pressure contact state is improved. .

The lubricating oil 16 that lubricates the inside of the differential case 3 adheres to the inner peripheral surface 2 a of the differential case 3 again by the centrifugal force of the differential case 3 and is pushed into the pump 22.

When a certain amount or more of lubricating oil 16 accumulates on the bottom of the diff cover 2, they naturally overflow, as shown in FIG. 5, and this overflow naturally flows through the diff carrier 12A, 12B. After returning to the inside of the acrus housing 15 and being cooled inside the acrus housing 15, it is sent again into the oil passage 18 by the reduction gear 11.

Next, a second embodiment of the present invention will be described with reference to FIG. The members having the same functions as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment shown in FIG. 4, the spiral ridge 26 in the first embodiment is formed on the fixed plate 24 itself, and the fixed plate 24 is attached to the rotary plate 23 by the disc spring 30 which is an elastic member. It is elastically pressed.

The rotary plate 23 is crimped to the end portion 3 a of the differential case 3 via an oil card 31 having an L-shaped cross section on the flange portion 23 a, and the oil guard 31 is provided between the oil girt 31 and the fixed plate 24. The oil packing 32 provided on the flange is fitted.

The fixed plate 24 has a peripheral edge portion 24 a axially slidably supported by the inner peripheral surface 2 a of the differential cover 2, and a spiral ridge 26 is formed on the end surface on the rotary body 23 side. .

The disc spring 30 is fixed by a ring-shaped stop ring 33, and the stop ring 33 is fitted to the inner peripheral surface 2 a at a position where the disc spring 30 is pressed against the fixing plate 24. Further, holes 23 b, 3 b, 7 a are formed in the rotary plate 23, the differential case 3, and the riff differential gear 7, respectively.

The lubricating oil 16 accumulated in the lower portion of the differential case 2 by the pump 22 having such a structure moves the inner peripheral surface 2a to the right in the drawing, and is pushed into the pump 22 through the outer peripheral end opening 26a, so that the ridge 26 Through the holes 23b, 3b, 7a, and functions as in the first embodiment.

By appropriately selecting the disc springs 30 having different elastic forces when the pump 22 is assembled, the pressure contact force between the rotary plate 23 and the ridge 26 can be adjusted, and the assembly error and the manufacturing error of parts can be absorbed. be able to.

[0030]

[Effect of the device]

 According to the present invention, the rotating body of the viscous pump and the non-rotating body on which the spiral ridge is formed are elastically brought into contact with each other by using an elastic member. The displacement of the space between the body and the spiral ridge can be absorbed, and the performance of the viscous pump can be kept constant.

Further, since the rotating body and the spiral ridges are in elastic contact with each other due to the elastic member, it is possible to suppress frictional wear between them and improve durability of lubricating oil, which is a viscous fluid due to frictional heat. it can.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view showing the flow of lubricating oil and the movement of the fixed plate in the first embodiment of the present invention.

FIG. 4 is a side view showing a main part of a second embodiment of the present invention.

FIG. 5 is a side sectional view showing an inter-diff equipped with the viscous pump of the present invention.

[Explanation of symbols]

 3 Rotating member (differential case) 16 Viscous fluid (lubricating oil) 22 Viscous pump 23 Rotating body (rotating plate) 24 Non-rotating body (fixed plate) 25, 30 Elastic member (rubber plate, leaf spring) 26 Spiral ridge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Kazuhiko Nakane 5-33-8, Shiba, Minato-ku, Tokyo, Mitsubishi Motors Corporation

Claims (1)

[Scope of utility model registration request] 1. A rotating body that rotates together with a rotating member, and a rotating body, which are opposed to each other with a gap between the rotating body and a viscous fluid that tends to move in a centrifugal direction by a centrifugal force of the rotating body. A non-contact type viscous pump comprising a non-rotating body on which a spiral ridge that regulates inward of a rotary body is formed, comprising an elastic member for elastically contacting the spiral ridge with the rotary body. The structure of the non-contact type viscous pump.