US-12623641-B2 - Brake pedal device

US12623641B2US 12623641 B2US12623641 B2US 12623641B2US-12623641-B2

Abstract

A housing is fixed to a vehicle. A shaft is rotatably mounted on the housing about a predetermined axis. A brake pedal is fixed to the shaft and operates around an axis of the shaft. A sensor device outputs a signal that detects a position of the shaft and the brake pedal relative to the housing, or a signal that detects a load applied to the brake pedal. A first fixing portion fixes a sensor component constituting at least a part of the sensor device to the housing or the brake pedal. A second fixing portion fixes the sensor component to the housing or the brake pedal using a fixing method different from that of the first fixing portion.

Inventors

Kenichiro TAKENAKA
Yuki Matsunaga

Assignees

DENSO CORPORATION

Dates

Publication Date: 20260512
Application Date: 20241009
Priority Date: 20220429

Claims (2)

1 . A brake pedal device used in a brake-by-wire system in which a brake mechanism brakes a vehicle under drive control of an electronic control device mounted on the vehicle, the brake pedal device, comprising: a housing fixed directly or indirectly to the vehicle; a shaft rotatably provided around a predetermined axis relative to the housing within a predetermined angle range; a brake pedal fixed to the shaft and configured to operate within a predetermined angle range around the axis; a sensor device that outputs a signal detecting positions of the shaft and the brake pedal relative to the housing to the electronic control device; a first fixing portion that fixes a sensor component constituting at least a part of the sensor device to the housing or the brake pedal; and a second fixing portion that fixes the sensor component and the housing or the brake pedal by a fixing method different from that of the first fixing portion, wherein the first fixing portion is configured to fix the sensor component on the axis by press-fitting a plurality of protrusions radially protruding from a part of an inner wall of a hole portion provided in the housing and an outer wall of a fitting protrusion provided in the sensor component, or by press-fitting a plurality of protrusions radially protruding from a part of the outer wall of the fitting protrusion and the inner wall of the hole portion.
2 . The brake pedal device according to claim 1 , wherein the component of the brake mechanism that brakes the vehicle and the brake pedal are not mechanically connected, and the brake pedal device is used in a complete brake-by-wire system in which the electronic control device drives and controls the brake mechanism to brake the vehicle based on an output signal of the sensor device.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Patent Application No. PCT/JP2023/012234 filed on Mar. 27, 2023, which designated the U.S. and based on and claims the benefits of priority of Japanese Patent Application No. 2022-075557 filed on Apr. 29, 2022. The entire disclosure of all of the above applications is incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a brake pedal device mounted on a vehicle. BACKGROUND Conventionally, a brake pedal device used in a brake-by-wire system is known. The brake-by-wire system is a system in which an electronic control unit (hereinafter referred to as “ECU”) controls an operation of a brake mechanism and applies brakes to the vehicle based on a sensor signal transmitted to the ECU from a sensor device provided in the brake pedal device. SUMMARY An object of the present disclosure is to provide a brake pedal device that has redundancy in the fixing of a sensor component that constitutes at least a part of the sensor device, and is capable of preventing the sensor component from falling off due to the same cause. According to one aspect of the present disclosure, a brake pedal device used in a brake-by-wire system in which a brake mechanism brakes a vehicle through drive control of an electronic control device mounted on the vehicle includes a housing, a shaft, a brake pedal, a sensor device, a first fixing portion, and a second fixing portion. The housing is directly or indirectly fixed to the vehicle. The shaft is provided to be rotatable around a predetermined axis relative to the housing within a predetermined angler range. The brake pedal is fixed to the shaft and operates within a predetermined angle range around the axis. The sensor device outputs a signal that detects the positions of the shaft and the brake pedal relative to the housing to the electronic control device. The first fixing portion fixes a sensor component constituting at least a part of the sensor device to the housing or the brake pedal. The second fixing portion fixes the sensor component and the housing or the brake pedal using a fixing method different from that of the first fixing portion. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic configuration diagram of a brake-by-wire system including a side view of a brake pedal device according to a first embodiment; FIG. 2 is a cross-sectional view perpendicular to an axis of a shaft in the brake pedal device; FIG. 3 is a cross-sectional view taken along a line III-III in FIGS. 1 and 2; FIG. 4 is a cross-sectional view showing only a sensor main body and a housing in a portion IV of FIG. 3; FIG. 5 is an exploded view of the sensor main body and housing shown in FIG. 4; FIG. 6 is a view from an arrow direction of a line VI-VI in FIG. 5; FIG. 7 is a view from an arrow direction of a line VII-VII in FIG. 5; FIG. 8 is a cross-sectional view showing only a sensor main body and a housing in a brake pedal device of a comparative example; FIG. 9 is an exploded view of the sensor main body and housing shown in FIG. 8; FIG. 10 is a view from an arrow direction of a line X-X in FIG. 9; FIG. 11 is a view from an arrow direction of a line XI-XI in FIG. 9; FIG. 12 is a cross-sectional view showing only a sensor main body and a housing in a brake pedal device according to a second embodiment; FIG. 13 is an exploded view of the sensor main body and housing shown in FIG. 12; FIG. 14 is a view from an arrow direction of a line XIV-XIV in FIG. 13; FIG. 15 is a view from an arrow direction of a line XV-XV in FIG. 13; FIG. 16 is a cross-sectional view showing only a sensor device and a housing in a brake pedal device according to a third embodiment; FIG. 17 is an exploded view of the sensor device and housing shown in FIG. 16; FIG. 18 is a cross-sectional view taken along a line XVIII-XVIII in FIG. 16; FIG. 19 is a cross-sectional view of a portion corresponding to FIG. 18 in a sensor device and a housing provided in a brake pedal device according to a fourth embodiment; FIG. 20 is a cross-sectional view showing only a sensor device and a housing in a brake pedal device according to a fifth embodiment; FIG. 21 is an exploded view of the sensor device and housing shown in FIG. 20; FIG. 22 is an explanatory diagram for explaining a method for fixing the sensor device to the housing; FIG. 23 is a perspective view showing a portion of a sensor device provided in a brake pedal device according to a sixth embodiment that is fixed to a housing; FIG. 24 is a perspective view showing a portion of a housing provided in a brake pedal device according to a sixth embodiment, to which a sensor device is fixed; FIG. 25 is a cross-sectional view showing only a sensor device and a housing in a brake pedal device according to a sixth embodiment; FIG. 26 is a cross-sectional view showing only a sensor device and a housing in a brake pedal device according to a seventh embodiment; and FIG. 27