The Product Types Ontology for Semantic Web-based E-Commerce
type: Ontology
imports: v1
title: PTO: The Product Types Ontology for Semantic Web-based E-Commerce
comment: The Product Types Ontology: Good identifiers for product types based on Wikipedia This service provides GoodRelations-compatible class definitions for any type of product or service that has an entry in the English Wikipedia. Vocabulary: http://www.productontology.org/# Namespace: http://www.productontology.org/ The Product Types Ontology is designed to be used in combination with GoodRelations, a standard vocabulary for the commercial aspects of offers. See http://purl.org/goodrelations/ for more information.
license: http://creativecommons.org/licenses/by-sa/3.0/
version info: 2026-08-28T18:28:53.970445
contributor: The class abstracts and translations of labels are taken from Wikipedia, the free encyclopedia.
creator: Martin Hepp
rights: The class definition texts are taken from Wikipedia, the free encyclopedia under a Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license, see http://creativecommons.org/licenses/by-sa/3.0/. Accordingly, all ontology class definitions provided in here are available under the very same license.
subject: E-Commerce, E-Business, GoodRelations, Ontology, Wikipedia, DBPedia

Wheel cylinder
type: Class
subclass of: ProductOrService
subclass of: Product
comment: A wheel cylinder is a component of a hydraulic drum brake system. It is located in each wheel and is usually positioned at the top of the wheel, above the shoes. Its function is to exert force onto the shoes so as to bring them into contact with the drum and stop the vehicle with friction. The wheel cylinders are usually connected to the shoes with small bird-beak shaped rods. Wheel cylinders were first invented by Bendix in 1958. It is very similar to a slave cylinder and functions in much the same way, internally consisting of only a simple plunger. On older vehicles, these may begin to leak and hinder the performance of the brakes. They are, however, normally inexpensive and relatively easy to replace. The wheel cylinder consists of a cylinder that has two pistons, one on each side. Each piston has a rubber seal and a shaft that connects the piston with a brake shoe. When brake pressure is applied, the pistons are forced out, pushing the shoes into contact with the drum. Some designs use two single piston wheel cylinders, one at the top of the drum and one at the bottom, each connected to one brake shoe. Wheel cylinders must be rebuilt or replaced if they show signs of leaking. Wheel cylinders used to be made of cast iron. However, they were more prone to rusting and aluminium is now the preferred material. It has a cylinder, two pistons, two rubber cups and a spring. The fluid presses against the pistons that move outward in the cylinder. When the pistons come closer, the liquid is forced into the master cylinder, the spring between the two pistons holds the rubber cups in positions. (Source: Wikipedia, the free encyclopedia, see http://en.wikipedia.org/wiki/Wheel_cylinder)
label: Bremszylinder @de
label: Тежеуіштің негізгі (басты) цилиндр @kk
label: Тормозной цилиндр @ru
describedby: Wheel cylinder.rdf
describedby: Wheel cylinder.ttl