JPS61223343A - Wet-type brake cooling mechanism - Google Patents

Abstract

PURPOSE:To improve the cooling ability by partitioning off a floating seal chamber from a brake chamber and forming oil paths in such a manner that oil is circulated through a wet-type brake chamber and a speed reduction gear chamber. CONSTITUTION:The inner peripheral edge of a back plate 23 is extended to be integral with a shielding plate 40, and the inner peripheral portion of a wet-type brake chamber 1 and the internal space of an introduction hole 27 are shielded from a floating seal chamber 34. The floating seal chamber 34 is connected to a speed reduction gear chamber 15 by a discharge oil path 44 disposed in the wall thickness of a wheel hub 17. The speed reduction gear chamber 15 is connected to a wet-type brake chamber 1 through return oil paths 42, 43, a passage 44 between an axle shaft 5 and an axle pipe 11 and a hole 28.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wet brake cooling mechanism that can be employed in forklifts and other industrial vehicles, construction machines, agricultural machines, machinery, and the like.

(Prior Art) A conventional axle wet brake structure is shown in FIG. Second
When Jζ is in the 44 structure shown in the figure, the flow of lubricating oil (oil) forms a loop only in the wet brake chamber 1 as shown by the arrow, and heat generated by the friction between the brake disc 2 and the plate 3 is generated. Since the absorption capacity of the plate 3 is small and the heat dissipation area is also small, the friction material on both sides of the brake disc 2 wears out quickly, and under severe usage conditions, the plate 3 may become bent or the friction material may burn out. As a countermeasure for this, an oil cooler and pump are installed, forcing the i+
Some methods do this, but the cost increases significantly.

In the conventional structure shown in FIG. 2, the right end of the axle shaft 5 is connected to a differential (not shown), and the shaft 5 is connected to a differential gear (not shown), and a zipper is provided at the left end. The t-foot meshes with an internal gear 9 via a planetary gear S7 (planetary gear) 8, and the internal gear 9 is fixed to an axle pipe 11 via an internal gear hub 10.

The axle pipe 11 has ports 1 to 12 in the housing 6,
It is fastened together with the brake case 13 by.

The support shaft 14 of the planetary gear 8 is connected to the wheel hub 17 via a gear 16 which also serves as a side wall of the reduction gear chamber 15, and a boss tube 18 is provided on the inner circumference of the wheel hub 17 and projects toward the wet brake chamber 1 side. The boss tube 18 is supported on the axle pipe 11 via a bearing 19, and the axle pipe 11 via a bearing 20 and an internal gear hub 10. 21 is a cover.

Brake cases 13 and 13- are integrally attached to the axle pipe 11, and the plate 3, back plate 23, and pressure plate 25 are attached to the brake case 1.
The brake disc 2 is fitted into the notch groove 2/I (spline teeth) in the notched groove 2/I (spline tooth) part so that it can slide only in the axial direction, and the brake disc 2 is fitted in the notched groove 26 part of the boss cylinder 18 so that it can only slide in the axial direction. The back plate 23 and the pressure plate 2 fit together freely.
5, brake discs 2 and plates 3 are arranged alternately. Each brake disc 2 has an oil introduction hole 27 on its inner circumference, and has an oil introduction hole 27 on its inner circumference. The inner periphery of the brake disc 2 communicates with the inner periphery of the wet-type brake chamber 1 through the hole 28 of the axle pipe 11 and with the oil passage 29 between the axle shaft 5 and the axle shaft housing 6. are doing. 30. is the oil level. The friction material on both sides of the brake disc 2 is provided with a large number of grooves 31 passing through it from the inner circumference to the outer circumference. Therefore, the oil in the grooves 31 is subjected to centrifugal force while the brake disc 2 is rotating. They are arranged to gather in a notched groove 24 on the outer periphery. A groove 32 penetrating from the outer periphery to the inner periphery is provided on the back surface of the back plate 23 (left side in FIG. 2), so that the pressurized oil in the notched groove 24 passes through the inner periphery of the bank plate 23. J: which flows to the introduction hole 27 side. A floating seal 33 seals between the brake case 13' and the wheel hub 17 with its outer circumferential lip, and the floating seal 33 communicates with the introduction hole 27.

An annular piston 35 fits into an annular cylinder 4 provided in the brake case 13, and the cylinder 4 is connected to a brake master cylinder (not shown) via an oil passage 36.

In the conventional W6 structure like this, the oil in the wet brake chamber 1 receives centrifugal force within the groove 31 of the rotating brake disc 2, and is discharged radially outward to the spline tooth removal portion of the notch groove 24. The oil in the notched groove 24 flows into the groove 32.
Since the liquid is returned to the introduction hole 27 side through the air and circulated in a small loop shown by the arrow in FIG. 1, the above-mentioned problems are not avoided.

(Objective of the Invention) An object of the present invention is to improve the flow of brake oil and improve the cooling capacity.

(Structure of the Invention) The present invention connects a wheel hub to the end of an axle shaft via a final reducer, and supports a wheel 2 hub by protruding a boss tube from the inner circumference of the wheel hub in the opposite direction to the reducer. Attach the brake case that surrounds the boss/tube to the axle pipe, and easily install the wheel hub boss [Noda brake disc and play attached to the brake case] and back play 1, and the wet type with the built-in hydraulic piston in the brake case. Forming the brake, wheel hub door-1
- A floating seal is inserted between the cases, and an oil inlet hole is provided on the inner circumference of the brake disc.The oil in the oil inlet hole is applied to the edge material of the brake disc by centrifugal force and transferred to the outer circumference. A vortex is installed between the back plate and the brake case to guide the pressurized oil around the outer circumference of the brake disc to the floating seal chamber. At the same time, a discharge oil passage connecting the floating seal chamber and the reduction gear room, and a return oil passage connecting the reduction gear room and the inner periphery of the brake disc are provided so that oil circulates between the wet brake chamber and the reduction gear room. It is a wet brake cooling system characterized by J1gN structure.

(Example) The present invention is shown in FIG. In Figure 1, the same symbols as those in Figure 2 are corresponding parts, and the changes are 3 in AlB and C.
It is a point. First, in part A, the inner circumferential edge of the back plate 23 is extended radially inward (the inner diameter is reduced), and a shielding plate 40 is integrally formed. The internal space of the floating seal chamber 34 is almost completely shielded from the floating seal chamber 34. Therefore, the notched groove 24 on the outer periphery of the wet brake communicates only with the inner periphery of the floating seal chamber 34 through the groove 32.

The plurality of discharge oil passages 41 in the B section are laid in layers within the wall thickness of the wheel hub 17, communicate the floating seal chamber 34 and the reducer chamber 15, and flow from the floating seal chamber 34 side to the reducer chamber 15'' side. It is inclined so as to be biased outward in the radial direction of the axle shaft 5 as it goes.

The passages 42 and 43 in the C portion cooperate with the passage 44 between the axle shaft 5 and the axle pipe 11 and the hole 28 to form a return oil passage for returning the oil in the reduction gear chamber 15 to the wet brake chamber 1. The passage 42 is formed by a notch in the inner circumference of the internal gear hub 10, and the passage 43 is formed by a radial cutout in the axle pipe 11.

Next, the operation will be explained. Since the brake disc 2 is visible not only when the vehicle is driving but also when the braking force is applied, the oval part 31 of the brake disc 2 is subjected to centrifugal force and is pushed inside the notch groove 24 (spring, line tooth). Excluded.

The pressurized air in the cutout groove 24 passes through the groove 32 and enters the floating chamber I-9 chamber 34.
The oil in 4 is discharged during rotation 1. Road-1, Pon.

1! Actively goes to the reducer room 15 by the action of the brake! : Served
□1. The oil in the chamber 15 is
After lubricating and cooling $ jjl 1m, passage 42.4
'3.44, hole pre-8 force (from the stomach, return to the wet brake chamber 1 through the return oil path, and play.)
In this way, it circulates in a large loop like an arrow. Brake disc 2, plate 3. .

The oil that absorbs heat between the wheels and becomes high temperature is cooled while circulating in the large loop. In particular, the wheel hub 147 has a large heat dissipation area, and since it rotates, the heat dissipation effect is great. Sufficiently cooled oil is used as a brake. Returned to room 1.

(Effect of the invention) As explained above, in the present invention, 70-23-5
Since the brake chamber 1 is divided by the shielding plate 40 on the inner circumference, the high-temperature pressurized oil in the chamber 34 enters the reduction chamber 11, which has a large area for radiating and heat, and the wheels and huffs 17 are rotated. In combination with this, the brake chamber is sufficiently cooled and cooled. fart! , I can pass. This reduces wear on the brake deg
This may cause bending of the friction material or burnout of the friction material. There is no need to worry.In addition, it is possible to significantly reduce costs compared to the case of forced cooling by equipping the oil cooler and pump gate separately. Return oil for 41 minutes of discharge oil path!,<Passage 42.43.4
4, etc.), the circular loop of °oinoi can be made larger, so it can be implemented with a very small increase in cost compared to the conventional structure.

(Another embodiment) Instead of providing the shielding plate 40 integrally with the back plate 23, the brake disc 2 adjacent to the back plate 23
By eliminating the hole 27a, the brake disc 2 can also serve as a shielding plate. The discharge oil passage 41 may be parallel to the axle 5. In that case, processing becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a brake 114M according to the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional structure. 1... Wet brake chamber, 2... Brake disk, 3... Plate, 5... Axle, 11... Axle pipe, 15
...Reduction gear room, 17...Wheel hub, 18...
Boss cylinder, 23... Back plate, 31.32...
groove, 33...70-ding seal, 34...floating seal chamber, 35...piston, 37...
Introduction hole, 40... Shielding plate, 41... Discharge oil path, 4
2.43.44... Passage (return oil path) Procedural amendment (voluntary) May 1985 291 1. Indication of the incident 1985 Patent application No. 64707 2. Name of the invention Wet brake cooling mechanism 3. Relationship with the case of the person making the amendment Office of the patent applicant
Neyagawa-shi Kida Motomiya 11-1 Name: Daikin Seisakusho Co., Ltd. Representative Director and President: Masaru Returnate 4, Agent address: 10th floor, East Building, Chiyoda Building, 2-9-4 Higashitenma, Kita-ku, Osaka (530) 6. Target of amendment Description, Drawing 7, Contents of amendment (1) Next to 1 seal 33 in page 5, line 20 of the specification, add ``The inner periphery of the chamber 34 in which is accommodated''. (2) On page 6, line 10, "Figure 1" is corrected to "Figure 2." (3) Page 11, line 15 of 11...Axle” is followed by “
Add "Shaft". (4) On page 11, line 17, after “4...”, “Aisle (
Add "return passage)". (5) Delete "passage (return passage)" in line 18 on page 11. (6) Amend Figure 1 so that it is not shown in the attached drawings (amendment to curve and extend the leader line 11). 8. List of attached documents (1) One or more amended drawings (Figure 1)

Claims (5)

[Claims] (1) Connect the wheel hub to the end of the axle shaft via the final reducer, make the boss tube protrude from the inner circumference of the wheel hub in the opposite direction to the reducer, and attach the boss tube to the axle pipe that supports the wheel hub. A wet brake is formed by the brake disc attached to the wheel hub boss tube, the plate and back plate attached to the brake case, and the hydraulic piston built into the brake case, and the brake case is attached between the wheel hub and the brake case. A floating seal is inserted, an oil introduction hole is provided on the inner circumference of the brake disk, and a groove is provided in the friction material of the brake disk to send the oil in the oil introduction hole to the outer circumference using centrifugal force. A groove that guides pressurized oil to the floating seal chamber is provided between the back plate and the brake case, and the drain oil is used to shield the floating seal chamber and the inner circumference of the brake disc, as well as connect the floating seal chamber and the reducer chamber. A wet brake cooling mechanism characterized in that a return oil passage connecting the reduction gear chamber and the inner circumference of the brake disk is provided so that oil circulates between the wet brake chamber and the reduction gear chamber. (2) The wet brake cooling mechanism according to claim 1, wherein the floating seal chamber and the inner periphery of the brake disk are shielded by the inner periphery of the back plate. (3) The wet brake cooling mechanism according to claim 1, wherein the floating seal chamber is shielded by the inner periphery of the brake disc. (4) The wet brake cooling mechanism according to claim 1, wherein the final reduction gear is of a planetary gear type. (5) The wet brake cooling mechanism according to claim 1, wherein the discharge oil passage is inclined outward in the radial direction of the axle as it goes from the floating seal chamber toward the reduction gear chamber within the wall thickness of the wheel hub.