JP-7857246-B2 - Electrical control device

Inventors

• 安永 貴紀
• 清水 博明

Assignees

• 川崎重工業株式会社

Dates

Publication Date

20260512

Application Date

20230324

Claims (5)

1. An electrical operating device that outputs an electrical signal corresponding to the operation of an operating tool, A camshaft extending horizontally, A cam having a pressing portion, to which the operating tool is attached, and which is pivotable around the cam shaft, A push rod located below the pressing portion, the upper end of which is displaced downward when pressed downward by the pressing portion, A base extending vertically below the pressing portion and having a guide hole for guiding the push rod vertically, A grease cup is provided above the guide hole, which together with the upper end of the push rod forms a storage space for storing grease. An electrically operated device in which the grease cup is integrally molded with the base.
2. The grease cup is, Below the cam, facing the cam in the vertical direction, is an annular bottom wall whose inner periphery connects to the upper end of the guide hole, The electrical operating device according to claim 1, further comprising a peripheral wall rising upward at the outer peripheral edge of the bottom wall.
3. The cam is configured to swing within a predetermined range of motion. The electrical operating device according to claim 2, wherein the grease cup is configured such that the pressing portion is located below the upper end of the peripheral wall when the cam is in at least a portion of the range of oscillation.
4. The electrical operating device according to claim 2 or 3 , wherein the portion of the upper surface of the base that overlaps with the cam shaft in a top view is recessed downward compared to the upper end of the peripheral wall.
5. The electrical operating device according to claim 1 or 2, comprising a second push rod positioned on the opposite side of the cam shaft from the side where the first push rod, which is the push rod, is located, in a horizontal direction perpendicular to the cam shaft.

Description

This disclosure relates to an electrically operated device. Patent Document 1 discloses an electronic operating device comprising a cam rotatably mounted on a support base and operated by an operator, and a magnetic sensor for detecting the rotational position of the cam. A boss located on the underside of the cam contacts the head of a plunger, and is returned to the neutral position by a spring housed in a body connected to the support base. Japanese Patent Publication No. 2018-10635 This is a schematic cross-sectional view of a part of an electrical control device according to one embodiment.This is a side cross-sectional view of the electrical control device in Figure 1 when it is not being operated.This is a side cross-sectional view of the electrical control device in Figure 1 when it is fully operated.This is a magnified perspective view showing the vicinity of the contact area between the cam and the pushrod. The embodiments will be described below with reference to the drawings. <Implementation> Figure 1 is a schematic cross-sectional perspective view of an electrical control device 1 according to an embodiment. The electrical control device 1 outputs electrical signals corresponding to the operation of the control tool. The electrical control device 1 of this embodiment is, for example, a travel pedal device for construction machinery such as a hydraulic power shovel. The electrical control device 1 outputs electrical signals to drive the left and right crawlers of the construction machinery separately in the forward and reverse directions. The electrical control device 1 is fixed to the floor of the operator's cab of the construction machinery. The electric control device 1 comprises a left control device 2A and a right control device 2B. The left control device 2A is for operating the left crawler, and the right control device 2B is for operating the right crawler. Pedals are attached to each of the left and right control devices 2A and 2B. The left and right control devices 2A and 2B output electrical signals corresponding to the amount of operator input to the attached pedals. The left and right control devices 2A and 2B share a common casing 3. The left control unit 2A comprises a cam 4 to which a pedal is attached as an operating tool, and a camshaft 5 extending horizontally. The cam 4 is supported by the casing 3 so as to be pivotable around the camshaft 5 via the camshaft 5. When the pedal is not being operated by the operator, the cam 4 is in a predetermined neutral position within its pivot range. This neutral position may also be referred to as the no-operation position. A potentiometer 6 for detecting the pivot angle of the cam 4 is positioned at one end of the camshaft 5. The potentiometer 6 is positioned between the camshafts 5 of the left control unit 2A and the right control unit 2B. The potentiometer 6 detects the direction of pivot from the neutral position and the pivot angle from the neutral position of the cam 4, which pivots integrally with the pedal. An electrical signal corresponding to the pivot direction and pivot angle is output externally via wiring 7 extending from the bottom of the casing 3. For example, when the operator presses the pedal forward, causing the cam 4 to swing in the first direction, the left control device 2A outputs a signal to drive the left crawler in the forward direction. Similarly, when the operator presses the pedal backward, causing the cam 4 to swing in the second direction (opposite to the first direction), the left control device 2A outputs a signal to drive the left crawler in the reverse direction. The left control device 2A and the right control device 2B are equivalent to each other. The right control device 2B, like the left control device 2A, includes a cam 4 and a camshaft 5, which are supported by the casing 3. The left control device 2A and the right control device 2B are arranged side-by-side so that their respective camshafts 5 are coaxial. The left control device 2A and the right control device 2B are substantially symmetrical with respect to a plane perpendicular to the camshaft 5 that passes between them. Therefore, in the following description, the left control device 2A will be described, and the description of the right control device 2B will be omitted. Figures 2 and 3 are side cross-sectional views of the left control device 2A, cut in a plane perpendicular to the camshaft 5. Figure 2 shows the left control device 2A in a state not operated by the operator. Figure 3 shows the left control device 2A in a state where the pedal is fully operated by the operator. In this embodiment, as will be described later, the oscillation range of the cam 4 is restricted to a predetermined oscillation range, and the state where the pedal is fully operated by the operator is the state where the oscillation angle of the cam 4 from the neutral position is at its maximum. Also, for convenience, in this specification, the horizontal direction i