Hollow-Shaft QDD Actuators

QDD actuator layouts with hollow or pass-through routing concepts for compact robot joints that need clean cable, hose, or sensor routing.

Target Buyer:Best for robot mechanical teams constrained by cable routing, joint envelope, and serviceability.

Hollow rotary actuator module for cable-routing and compact joint review

Capability Highlights

Hollow routing review for joint cables and sensor harnesses
Compact coaxial packaging for hips, knees, ankles, and arm joints
Custom shaft, flange, bearing, and connector layouts for OEM builds

Typical Applications

Humanoid hip and ankle joints
Quadruped leg modules with protected cable routing
Mobile manipulator and research robot joints

Engineering Focus

Through-hole diameter, bend radius, and connector clearance
Shaft/flange strength, bearing layout, and radial load path
Sealing, harness exit direction, and assembly/service access

Buyer Decision Summary

A buyer should leave this page with a shortlist decision: whether this actuator family deserves a sample review, what must be measured first, and which constraints must be fixed before price comparison.

Best Evidence

Start with pass-through envelope and connect it to the real robot duty cycle instead of reviewing catalog values alone.

Primary Risk

Cable routing is solved after the actuator is selected

Next Buyer Action

Prepare required hollow diameter or cable bundle dimensions plus validation targets before requesting samples or commercial terms.

How to Evaluate This Actuator Family

Use this page to turn a product family into a shortlist decision. The useful comparison is not one headline torque number; it is how the actuator behaves inside the real robot joint.

Pass-through envelope

10–25 mm bore diameter depending on actuator class

Determines whether power, signal, brake, or sensor harnesses can route through the joint.

Bearing load path

Radial 2–8 kN, axial 1–5 kN depending on output bearing class

Prevents the hollow-shaft layout from weakening the output support.

Assembly access

Cable exit at 0°, 90°, or 180° relative to output flange

Affects field service, harness replacement, and repeatable production assembly.

Sample Validation Plan

Before a batch decision, buyers should define the evidence expected from sample review and internal testing.

Signal to Check	Review Basis	Evidence to Ask For
Pass-through envelope	10–25 mm bore diameter depending on actuator class	Define hollow diameter, connector direction, and bend radius before mechanical freeze.
Bearing load path	Radial 2–8 kN, axial 1–5 kN depending on output bearing class	Review load path, wall thickness, bearing span, and output flange geometry together.
Assembly access	Cable exit at 0°, 90°, or 180° relative to output flange	Define hollow diameter, connector direction, and bend radius before mechanical freeze.

Acceptance Thresholds to Define

Define measurable pass/fail thresholds before the sample arrives. This prevents a subjective review where one team checks torque, another checks packaging, and nobody records whether the actuator can move toward pilot build.

Pass-through envelope: Determines whether power, signal, brake, or sensor harnesses can route through the joint.
Bearing load path: Prevents the hollow-shaft layout from weakening the output support.
Assembly access: Affects field service, harness replacement, and repeatable production assembly.

When This Family May Not Fit

A QDD actuator family is valuable only when the application needs its trade-offs. The same module can be a poor fit when the surrounding joint requirements point in a different direction.

Cable routing is solved after the actuator is selected: Define hollow diameter, connector direction, and bend radius before mechanical freeze.
A large hollow shaft reduces stiffness or bearing margin: Review load path, wall thickness, bearing span, and output flange geometry together.

Buyer Inputs That Improve the First Reply

A complete first inquiry shortens review loops because engineering can separate fixed constraints from adjustable actuator choices.

Fixed Constraints

Required hollow diameter or cable bundle dimensions
Joint envelope, shaft/flange drawing, and load direction
Connector type, cable exit direction, and service access needs

Review Targets

Torque-speed-voltage target and thermal duty cycle
Prototype quantity and sample validation plan

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Pass-through envelope	10–25 mm bore diameter depending on actuator class	Determines whether power, signal, brake, or sensor harnesses can route through the joint.
Bearing load path	Radial 2–8 kN, axial 1–5 kN depending on output bearing class	Prevents the hollow-shaft layout from weakening the output support.
Assembly access	Cable exit at 0°, 90°, or 180° relative to output flange	Affects field service, harness replacement, and repeatable production assembly.

Engineering Documents by RFQ

Document packages are shared after the actuator family, joint envelope, and program context are clear. Ask for available datasheets, drawings, CAD files, torque-speed notes, compliance records, or test reports during RFQ review.

Document	Status	RFQ Input Needed
Datasheet PDF	Available by actuator class review	Torque, speed, voltage, and quantity target
2D drawing	Available by mechanical envelope review	Shaft, flange, bolt pattern, and connector constraints
3D CAD / STEP / IGES	Shared when applicable after RFQ context	Joint envelope, mounting direction, and confidentiality needs
Torque-speed / thermal envelope	Program-dependent review	Duty cycle, ambient temperature, current limit, and mounting heat path
Compliance or test reports	Requestable per program when available	Destination market and required document list

How to Request CAD / Datasheets Compliance Document Scope

RFQ Checklist

Required hollow diameter or cable bundle dimensions
Joint envelope, shaft/flange drawing, and load direction
Connector type, cable exit direction, and service access needs
Torque-speed-voltage target and thermal duty cycle
Prototype quantity and sample validation plan

Risk Controls

Cable routing is solved after the actuator is selected: Define hollow diameter, connector direction, and bend radius before mechanical freeze.
A large hollow shaft reduces stiffness or bearing margin: Review load path, wall thickness, bearing span, and output flange geometry together.

Product Gallery

Hollow-shaft rotary actuator module for robot wiring path evaluation

Hollow gear rotary actuator module for shaft and harness routing review

Hollow servo rotary actuator module for compact integration layouts

Hollow rotary actuator reference for through-bore robot joint packaging

Hollow servo actuator module for cable-routing and mounting discussion

Hollow gear actuator module for robot joint packaging comparison

Hollow rotary servo gear actuator module for OEM integration review

Buyer FAQ

Can every QDD actuator be made hollow-shaft?

No. Hollow routing depends on torque class, diameter, bearing layout, motor geometry, and connector requirements.

Can you review our joint envelope before sample selection?

Yes. Send drawings, STEP references, cable bundle data, and load assumptions for engineering review.

Related Resources

Inquiry Email

[email protected]

Email app

Include robot type, joint location, torque/speed/voltage targets, quantity, and destination.

Instant Chat

+86 18857971991

Chat on WhatsApp

Send QDD actuator specs, STEP files, or actuator references for engineering review.