A vacuum booster for an automobile

Abstract

The utility model relates to vacuum booster technical field, specifically disclose a kind of automobile vacuum booster, including shell, stud is connected on the lateral wall of shell, the push rod is equipped in shell, the end of push rod is connected with two parallel ejector rods, the outside of stud is equipped with detachable mounting bracket;The utility model connects two parallel ejector rods by being innovatively connected two parallel ejector rods at push rod end portion, and the linear thrust of single push rod is converted into two parallel output force;This makes a vacuum booster can simultaneously, directly drive and parallel double-piston brake master cylinder two pistons, breaks the restriction that traditional vacuum booster can only be used for in-line master cylinder, successfully solves the adaptation problem of vacuum booster and parallel double-piston brake master cylinder, so that it can be applied to more extensive field, such as motorcycle, tricycle using parallel master cylinder, greatly improves the versatility and market competitiveness of product.

Description

Technical Field

[0001] This utility model relates to the field of vacuum booster technology, specifically to an automotive vacuum booster. Background Technology

[0002] The braking system is the core guarantee of vehicle safety, and its performance is directly related to the safety of drivers and passengers. Modern vehicle braking systems generally use hydraulic braking. Its basic principle is that when the driver presses the brake pedal, the force is transmitted to the master cylinder. The master cylinder converts the mechanical force into hydraulic pressure, which is then transmitted through pipelines to the brake calipers of each wheel, thereby generating braking force.

[0003] To reduce the driver's pedal effort and improve braking comfort, vacuum boosters have become standard equipment in the vast majority of vehicles. Vacuum boosters utilize the negative vacuum pressure generated by the engine intake manifold or an electric vacuum pump to amplify the force applied by the driver to the pedal, making braking easier and less strenuous.

[0004] In the development of brake master cylinders, the in-line dual-chamber (parallel) brake master cylinder has become the mainstream design. Its two internal pistons are arranged in a straight line in series. A single push rod of the vacuum booster directly pushes the first piston, which then pushes the second piston via mechanical or hydraulic linkage, thus establishing two independent braking circuits. This design ensures high safety even if one circuit fails, as the other circuit can still provide partial braking force, and it works perfectly with single-push-rod vacuum boosters.

[0005] However, in certain vehicle models or high-performance braking systems (such as motorcycles, special vehicles, or modified vehicles), parallel dual-piston brake master cylinders (with two pistons arranged in parallel) are also used. These master cylinders typically have a separate reservoir and output circuit for each piston, allowing for independent or proportional distribution of braking force to the front and rear wheels to optimize braking performance. However, existing standard vacuum boosters only have one pushrod, whose output is a single linear motion, unable to simultaneously and directly drive two parallel pistons. This makes it difficult to effectively integrate traditional vacuum boosters with parallel dual-piston brake master cylinders, limiting their application in vehicles requiring this type of master cylinder and restricting the flexibility of braking system design. Utility Model Content

[0006] This utility model addresses the aforementioned shortcomings of existing technologies by providing an automotive vacuum booster that solves the compatibility problem between the vacuum booster and the parallel dual-piston brake master cylinder. This allows it to be applied to a wider range of fields, such as motorcycles and tricycles that use parallel master cylinders, greatly enhancing the product's versatility and market competitiveness. To achieve the above objectives, this utility model provides the following technical solution: An automotive vacuum booster includes a housing, with studs connected to the side wall of the housing, a push rod inside the housing, two parallel push rods connected to the end of the push rod, and a detachable mounting bracket fitted on the outside of the studs.

[0007] Preferably, the side wall of the housing is provided with a sealing groove, the push rod passes through the sealing groove, and a sealing ring and a stop ring are fitted on the outside of the push rod, with the stop ring fixing the sealing ring in the sealing groove. Preferably, one end of the two push rods is connected as one unit by a connecting plate, and the middle part of the connecting plate is connected to the end of the push rod by a screw.

[0008] Preferably, the end of the push rod away from the push rod is threadedly connected to a top post, the outer side of the top post is locked and fixed by a first nut, and the end of the top post is a hemispherical structure. Preferably, a second nut is fixed to the outer side of the top column.

[0009] Preferably, the mounting bracket includes two parallel pads, with a support cylinder that mates with the stud 8 and a relief cylinder that mates with the connecting plate connected between the two pads.

[0010] Preferably, the clearance sleeve and the connecting plate are in a clearance fit.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model innovatively connects two parallel push rods at the end of the push rod, converting the linear thrust of a single push rod into two parallel output forces. This allows a vacuum booster to simultaneously and directly drive the two pistons of a parallel dual-piston brake master cylinder, breaking the traditional limitation that vacuum boosters can only be used with inline master cylinders. It successfully solves the compatibility problem between vacuum boosters and parallel dual-piston brake master cylinders, enabling its application in a wider range of fields such as motorcycles and tricycles using parallel master cylinders, greatly enhancing the product's versatility and market competitiveness.

[0012] 2. This utility model achieves fine-tuning of the extension length of the push rod by setting a threaded push rod at the end of the push rod and locking it with a first nut. This design allows technicians to easily and accurately adjust the gap (i.e., the pedal free travel) between the end of the push rod and the master cylinder piston without disassembling the assembly when installing the booster and master cylinder. This ensures that the braking system can eliminate unnecessary free travel, making the braking response more sensitive, while avoiding dragging caused by excessive clearance, thereby optimizing the brake pedal feel and improving system reliability and maintainability.

[0013] 3. The connecting plate connects the roots of the two push rods into one, forming a stable rigid structure. This effectively prevents internal forces or deformation caused by asynchronous force on the two push rods, ensuring the synchronicity and smoothness of power transmission.

[0014] 4. The specially designed mounting bracket includes a clearance sleeve that encloses the two push rods and the connecting plate, forming an effective protective cavity. This not only prevents the push rods from bending due to accidental impacts during transportation, handling, and installation, but also blocks the intrusion of dust and foreign objects, ensuring the cleanliness and integrity of the precision transmission components.

[0015] 5. The detachable mounting bracket forms a raised mounting platform. This design allows the booster housing to be stably fixed to the brake master cylinder flange using studs 8 and nuts. The mounting bracket acts as a "raising pad," providing the necessary installation space for the double pushrods and connecting plate. The support cylinder bears the main clamping force, while the clearance fit between the positioning cylinder and the connecting plate ensures protection without restricting the free movement of the pushrods. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a structural diagram of the mounting bracket; Figure 3 This is a schematic diagram of the structure of the ejector pin; Figure 4 This is a schematic diagram of the structure of this utility model in conjunction with the brake master cylinder; In the diagram: 1-Outer shell; 101-Sealing groove; 2-Push rod; 201-Push block; 3-Sealing ring; 4-Stop ring; 5-Screw; 6-Push rod; 601-Connecting plate; 602-Push column; 603-First nut; 604-Second nut; 7-Mounting bracket; 701-Panace; 702-Support cylinder; 703-Relief cylinder; 8-Stud; 9-Master brake cylinder; 901-Piston. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 As shown, an automotive vacuum booster includes a housing 1, with a stud 8 connected to the side wall of the housing 1, a push rod 2 inside the housing 1, an integral push block 201 at one end of the push rod 2, and two parallel push rods 6 connected to the end of the push rod 2. A detachable mounting bracket 7 is fitted on the outside of the stud 8.

[0019] A sealing groove 101 is provided on the side wall of the outer casing 1. The push rod 2 passes through the sealing groove 101. A sealing ring 3 and a stop ring 4 are fitted on the outside of the push rod 2. The stop ring 4 fixes the sealing ring 3 in the sealing groove 101. One end of the two push rods 6 is connected as one unit through the connecting plate 601. The middle part of the connecting plate 601 is connected to the end of the push rod 2 through the screw 5, so that one push rod 2 drives the two push rods 6 to move synchronously.

[0020] like Figure 3 As shown, the end of the push rod 6 away from the push rod 2 is threadedly connected to the push post 602. The push post 602 is inserted into the push rod 6 and connected by threads to achieve adjustable length. The outer side of the push post 602 is fitted with a first nut 603, which can lock and fix the push post 602. The end of the push post 602 is a hemispherical structure, which cooperates with the piston 901 of the brake master cylinder 9. A second nut 604 is fixed to the outer side of the top column 602. The second nut 604 and the top column 602 are an integral structure. The second nut 604 enables the rotation of the top column 602, facilitating its adjustment. This allows technicians to easily and precisely adjust the gap (i.e., the pedal free travel) between the end of the push rod 6 and the master cylinder piston 901 without disassembling the assembly when installing the booster and master cylinder. This ensures that the braking system eliminates unnecessary free travel, making the braking response more sensitive, while avoiding dragging caused by excessive clearance, thereby optimizing the brake feel and improving system reliability and maintainability.

[0021] like Figure 4 As shown, a mounting bracket 7 is provided between the vacuum booster and the brake master cylinder 9, thereby increasing the mounting surface of the housing 1, as... Figure 2 As shown, the mounting bracket 7 includes two parallel pads 701. A support cylinder 702, which mates with a stud 8, and a clearance cylinder 703, which mates with a connecting plate 601, are connected between the two pads 701. The distance between the two pads 701 is less than the length of the stud 8. The stud 8 mates with the flange of the brake master cylinder 9 and is secured with a nut. The mounting bracket 7 acts as a "heightening pad," providing the necessary installation space for the double push rods 6 and the connecting plate 601. The support cylinder 702 bears the main clamping force, while the clearance cylinder 703 has a clearance fit with the connecting plate 601, ensuring protection without hindering the free movement of the push rods 6.

[0022] The clearance sleeve 703 and the connecting plate 601 are fitted with a clearance fit. The clearance sleeve 703 encloses the two push rods 6 and the connecting plate 601, forming an effective protective cavity. This not only prevents the push rods 6 from being bent by accidental impacts during transportation, handling and installation, but also blocks the intrusion of dust and foreign objects, ensuring the cleanliness and integrity of the precision transmission components.

[0023] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A car vacuum booster, comprising a housing, studs connected to the side wall of the housing, and a push rod disposed inside the housing, characterized in that: The end of the push rod is connected to two parallel push rods, and the outside of the stud is fitted with a detachable mounting bracket.

2. The automotive vacuum booster as described in claim 1, characterized in that: The side wall of the outer casing is provided with a sealing groove, the push rod passes through the sealing groove, and a sealing ring and a stop ring are fitted on the outside of the push rod. The stop ring fixes the sealing ring in the sealing groove.

3. The automotive vacuum booster as described in claim 1, characterized in that: One end of the two push rods is connected as one unit by a connecting plate, and the middle of the connecting plate is connected to the end of the push rod by a screw.

4. The automotive vacuum booster as described in claim 1, characterized in that: The top rod is threaded to a top post at the end away from the push rod. The outer side of the top post is locked and fixed by a first nut. The end of the top post has a hemispherical structure.

5. The automotive vacuum booster as described in claim 4, characterized in that: A second nut is fixed to the outside of the top column.

6. The automotive vacuum booster as described in claim 3, characterized in that: The mounting bracket includes two parallel pads, with a support cylinder that mates with a stud and a relief cylinder that mates with a connecting plate connected between the two pads.

7. The automotive vacuum booster as described in claim 6, characterized in that: The clearance sleeve and the connecting plate are fitted with a clearance.

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