GB2111621A - Reservoir for master cylinder - Google Patents
Reservoir for master cylinder Download PDFInfo
- Publication number
- GB2111621A GB2111621A GB08137254A GB8137254A GB2111621A GB 2111621 A GB2111621 A GB 2111621A GB 08137254 A GB08137254 A GB 08137254A GB 8137254 A GB8137254 A GB 8137254A GB 2111621 A GB2111621 A GB 2111621A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reservoir
- chamber
- passage
- outlet port
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/26—Reservoirs
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
Abstract
A reservoir for a brake master cylinder allows an outlet port (11) to be positioned substantially above the bottom wall (8) of a fluid chamber by providing a passage (14) which communicates the port with a point at a lower level in the chamber. The passage is defined by an insert member (13) fitted between the side wall (6) and an internal partition wall (9) and extending downwardly into a well (12) formed by a depression in the bottom wall (8). <IMAGE>
Description
SPECIFICATION
Reservoir for master cylinder
This invention relates to a reservoir for a master cylinder such as in a vehicle braking system.
With the continually increasing costs of fossil fuels there is increasing pressure on vehicle manufacturers to make vehicles more compact. As a result there is less space in the engine compartment to accommodate the components with are normally housed there.
In some cases the clearance height above an inlet port of a brake master cylinder and available to receive a reservoir for storing a supply of brake fluid is restricted. So that the reservoir tank is still able to hold the same volume of fluid, it may have an increased area, as seen in horizontal cross-section, to compensate for the reduced height. Nevertheless a reservoir of this form suffers a serious disadvantage in as much that it has been found under certain conditions, e.g. when the brakes are applied heavily while the vehicle is traversing a sharp bend, the fluid may be thrown to one end of the chamber with the result that the fluid level falls below the outlet port and air may enterthe braking system.
The present invention aims at a solution to this drawback, and in accordance with the invention there is provided a reservoir defining a storage chamber for fluid, an outlet port in a wall of the reservoir and positioned at a level above the chamber bottom, and a passage connecting the outlet port to the chamber and opening in the chamber at a level below the outlet port.
With a reservoir of this construction the passage may be arranged to open at a level below which the fluid level cannot fall under normal driving conditions thereby eliminating the risk of air entering the braking system even if the fluid level actually falls below the vertical position of the outlet port.
In a preferred reservoir the chamber has a substantially horizontal bottom wall and a well extending downwardly from the bottom wall, the passage opening in the well. In this way the risk of air passing through the outlet port is even more positively averted.
The passage may be integrally formed with the main walls of the master cylinder but in one preferred embodiment is defined by an insert mounted in the reservoir. In the case of a double chamber reservoir for use with a dual master cylinder, the insert can be conveniently supported onan interior wall dividing the chambers.
Amore complete understanding of the invention will be had from the following detailed description which is given with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of a reservoir embodying the invention, shown partly cut away to reveal the relevant details;
Figure 2 is a partial vertical section through the reservoir;
Figure 3 is a view along the line Ill-Ill in Figure 2; and
Figures 4A to 4C are front and side elevations and vertical section of the insert shown on an enlarged scale.
The reservoir illustrated in the drawings is of the
dual chamber type for use with a vertically mounted tandem master cylinder. A first chamber 1 of gener allycolumnarform is provided with a lower outlet port 2. The second chamber 3 is generally horizontal and of flatter form and includes front and rear end walls, 4,5 opposed side walls 6,7 and a bottom wall 8. Internal partition walls 9 separate the chambers 1, 3, a slot 10 being provided in one such wall to allow fluid to spill over between the chambers during filling. The chamber 3 has an outlet port 11 positioned in the side wall 6, the height of this port above the first port 2 being determined by the particular master cylinder with which the reservoir is to be used and as shown it may be near the level of the bottom wall 8.Below the port lithe bottom wall is formed with a generally semi-cylindrical depression orwell 12. As so far described the reservoir may be made as a single unitary moulding of synthetic plastics material. The reservoir cover (not shown) may be made as a second moulding and welded in place on the reservoir.
An insert member 13 which may be conveniently moulded from polypropylene or hard rubber is mounted in chamber 3 between the sidewall 6 and the opposed interior partition wall 9. The member 13 is of generally rectangular configuration and includes a passage 14 having a horizontal first portion opening through a hemi-spherical pip-like projection 15 adapted to engage sealingly in the outlet port 11 as seen in Figure 2, and a vertical portion extending downwardly to the lower end of member 13 which is located close to the bottom of the well 12. A securing clip 16 of inverted L-shape is adapted to pass through the lower end of slot 10 and to grip the partition wall 9 to retain the member 13 firmly in position. To permit unrestricted flow of fluid into the passage 14 the member is provided with a transverse groove 17 at its lower end to define a side opening.As shown in Figures 2 to 4 the groove may extend to one side only.
From the foregoing description it will be understood that the passage 14 of member 13 communicates the outlet port 11 with the interior of chamber 3 at a level which is substantially below the level of the port itself. Even if the fluid in chamber 3 is thrown forwards away from the port 11 there is no risk of the bottom opening of passage 14 becoming uncovered, at least under normal driving conditions. The insert member also acts as a baffle to slow down any tendency for fluid to pass from one side to the other of the well cavity, which further assists in minimising any danger of the passage opening becoming uncovered.
1. A reservoir for a master cylinder, comprising a storage chamber for fluid, an outlet port in a side wall of the chamber, the outlet port being positioned at a level above the chamber bottom, and a passage communicating the outlet port with the chamber interior and opening into the chamber at a level substantially below the outlet port.
2. A reservoir according to claim 1, wherein the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A reservoir for a master cylinder, comprising a storage chamber for fluid, an outlet port in a side wall of the chamber, the outlet port being positioned at a level above the chamber bottom, and a passage communicating the outlet port with the chamber interior and opening into the chamber at a level substantially below the outlet port.
2. A reservoir according to claim 1, wherein the
chamber has a substantially horizontal bottom wall,
a recess in the bottom wall defines a downwardly
extending well, and said passage opens into the
well.
3. A reservoir according to claim 2, wherein said
well is located adjacent said side wall and beneath said port, said passage extending downwardly from
the port to the well adjacent the inside surface of the side wall.
4. A reservoir according to claim 1,2 or 3, wherein the passage is defined by means integrai with said side wall.
5. A reservoir according to claim 1,2 or 3, wherein the passage is defined by an insert member
mounted in the reservoir chamber.
6. A reservoir according to claim 5, wherein an
inner wall is spaced from said side wall and the
insert member is received between said walls with a
close fit whereby the insert member is pressed into
sealing engagement with the outlet port.
7. A reservoir according to claim 6, wherein the
insert member comprises clip means for securing the insert member in predetermined position on the
inner walL
8. A reservoir according to any one of the
preceding claims, wherein a duct is connected to the
lower end of the passage and extends transversely
therefrom to define a lateral inlet to the passage.
9. A reservoir according to claim 8, wherein said
duct is defined by a downwardly open groove.
10. A reservoir substantially as herein described
with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08137254A GB2111621A (en) | 1981-12-10 | 1981-12-10 | Reservoir for master cylinder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08137254A GB2111621A (en) | 1981-12-10 | 1981-12-10 | Reservoir for master cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2111621A true GB2111621A (en) | 1983-07-06 |
Family
ID=10526519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08137254A Withdrawn GB2111621A (en) | 1981-12-10 | 1981-12-10 | Reservoir for master cylinder |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2111621A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3459777A1 (en) * | 2017-09-21 | 2019-03-27 | Advics Co., Ltd. | Reservoir tank |
US11052890B2 (en) * | 2016-03-11 | 2021-07-06 | Robert Bosch Gmbh | Brake reservoir with internal conduit for integrated power brake unit |
-
1981
- 1981-12-10 GB GB08137254A patent/GB2111621A/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11052890B2 (en) * | 2016-03-11 | 2021-07-06 | Robert Bosch Gmbh | Brake reservoir with internal conduit for integrated power brake unit |
EP3459777A1 (en) * | 2017-09-21 | 2019-03-27 | Advics Co., Ltd. | Reservoir tank |
US10744988B2 (en) | 2017-09-21 | 2020-08-18 | Advics Co., Ltd. | Reservoir tank |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |